//*************************************************************************
// Method: GetUserNetworkInternal()
//
/// <summary>
/// Gets a network of Twitter users, given a GraphMLXmlDocument.
/// </summary>
///
/// <param name="sScreenNameToAnalyze">
/// The screen name of the Twitter user whose network should be analyzed.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="eNetworkLevel">
/// Network level to include. Must be NetworkLevel.One, OnePointFive, or
/// Two.
/// </param>
///
/// <param name="iMaximumPeoplePerRequest">
/// Maximum number of people to request for each query, or Int32.MaxValue
/// for no limit.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// The GraphMLXmlDocument to populate with the requested network.
/// </param>
//*************************************************************************
protected void GetUserNetworkInternal(
String sScreenNameToAnalyze,
WhatToInclude eWhatToInclude,
NetworkLevel eNetworkLevel,
Int32 iMaximumPeoplePerRequest,
RequestStatistics oRequestStatistics,
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert( !String.IsNullOrEmpty(sScreenNameToAnalyze) );
Debug.Assert(eNetworkLevel == NetworkLevel.One ||
eNetworkLevel == NetworkLevel.OnePointFive ||
eNetworkLevel == NetworkLevel.Two);
Debug.Assert(iMaximumPeoplePerRequest > 0);
Debug.Assert(oRequestStatistics != null);
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
// The key is the screen name and the value is the corresponding
// TwitterVertex. This is used to prevent the same screen name from
// being added to the XmlDocument twice.
Dictionary<String, TwitterVertex> oScreenNameDictionary =
new Dictionary<String, TwitterVertex>();
// Include followed, followers, both, or neither.
Boolean [] abIncludes = new Boolean[] {
WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.FollowedVertices),
WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.FollowerVertices),
};
for (Int32 i = 0; i < 2; i++)
{
if ( abIncludes[i] )
{
GetUserNetworkRecursive(sScreenNameToAnalyze, eWhatToInclude,
(i == 0), eNetworkLevel, iMaximumPeoplePerRequest, 1,
oGraphMLXmlDocument, oScreenNameDictionary,
oRequestStatistics);
}
}
Boolean bIncludeLatestStatus = WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.LatestStatuses);
AppendMissingGraphMLAttributeValues(oGraphMLXmlDocument,
oScreenNameDictionary, true, bIncludeLatestStatus,
oRequestStatistics);
AppendRepliesToAndMentionsXmlNodes(oGraphMLXmlDocument,
oScreenNameDictionary,
WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.RepliesToEdges),
WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.MentionsEdges)
);
}
//*************************************************************************
// Method: AppendSharedResponderEdges()
//
/// <summary>
/// Appends an edge XML node for each pair of videos for which the same
/// person responded.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// The GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oVideoIDs">
/// The set of unique video IDs.
/// </param>
///
/// <param name="iMaximumResponses">
/// Maximum number of responses to request, or Int32.MaxValue for no limit.
/// </param>
///
/// <param name="sUrlPattern">
/// URL to get the responses for one video, with "{0}" where the video ID
/// goes.
/// </param>
///
/// <param name="sResponderTitle">
/// Title describing the person who has responded. Samples: "commenter",
/// "video responder".
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void AppendSharedResponderEdges(
GraphMLXmlDocument oGraphMLXmlDocument,
HashSet<String> oVideoIDs,
Int32 iMaximumResponses,
String sUrlPattern,
String sResponderTitle,
RequestStatistics oRequestStatistics
)
{
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oVideoIDs != null);
Debug.Assert(iMaximumResponses > 0);
Debug.Assert( !String.IsNullOrEmpty(sUrlPattern) );
Debug.Assert(sUrlPattern.IndexOf("{0}") >= 0);
Debug.Assert( !String.IsNullOrEmpty(sResponderTitle) );
Debug.Assert(oRequestStatistics != null);
AssertValid();
// The key is the name of an author and the value is a LinkedList of
// the video IDs to which the author has responded.
Dictionary< String, LinkedList<String> > oAuthorUserNameDictionary =
new Dictionary< String, LinkedList<String> >();
foreach (String sVideoID in oVideoIDs)
{
ReportProgress(String.Format(
"Getting {0}s for the video with the ID \"{1}\"."
,
sResponderTitle,
sVideoID
) );
// This is to prevent self-loop edges that would result when the
// same author responds to the same video more than once.
HashSet<String> oAuthorUserNames = new HashSet<String>();
String sUrl = String.Format(sUrlPattern, sVideoID);
// The document consists of an "entry" XML node for each response.
foreach ( XmlNode oEntryXmlNode in EnumerateXmlNodes(sUrl,
"a:feed/a:entry", iMaximumResponses, true,
oRequestStatistics) )
{
XmlNamespaceManager oXmlNamespaceManager =
CreateXmlNamespaceManager(oEntryXmlNode.OwnerDocument);
String sAuthorUserName;
if (
XmlUtil2.TrySelectSingleNodeAsString(oEntryXmlNode,
"a:author/a:name/text()", oXmlNamespaceManager,
out sAuthorUserName)
&&
!oAuthorUserNames.Contains(sAuthorUserName)
)
{
AddVideoIDToDictionary(sAuthorUserName, sVideoID,
oAuthorUserNameDictionary);
oAuthorUserNames.Add(sAuthorUserName);
}
}
}
ReportProgress("Adding edges for shared " + sResponderTitle + "s.");
AppendEdgesFromDictionary(oAuthorUserNameDictionary,
oGraphMLXmlDocument, "Shared " + sResponderTitle);
}
//*************************************************************************
// Method: CreateGraphMLXmlDocument()
//
/// <summary>
/// Creates a GraphMLXmlDocument representing a network of YouTube videos.
/// </summary>
///
/// <returns>
/// A GraphMLXmlDocument representing a network of YouTube videos. The
/// document includes GraphML-attribute definitions but no vertices or
/// edges.
/// </returns>
//*************************************************************************
protected GraphMLXmlDocument CreateGraphMLXmlDocument()
{
AssertValid();
GraphMLXmlDocument oGraphMLXmlDocument = new GraphMLXmlDocument(false);
DefineRelationshipGraphMLAttribute(oGraphMLXmlDocument);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, TitleID,
"Title", "string", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, RatingID,
"Rating", "double", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, ViewsID,
"Views", "int", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, FavoritedID,
"Favorited", "int", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, CommentsID,
"Comments", "int", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, CreatedDateUtcID,
"Created Date (UTC)", "string", null);
DefineImageFileGraphMLAttribute(oGraphMLXmlDocument);
DefineCustomMenuGraphMLAttributes(oGraphMLXmlDocument);
return (oGraphMLXmlDocument);
}
//*************************************************************************
// Method: CreateGraphMLXmlDocument()
//
/// <summary>
/// Creates a GraphMLXmlDocument representing a network of Flickr related
/// tags.
/// </summary>
///
/// <param name="bIncludeSampleThumbnails">
/// true to include a sample thumbnail for each tag.
/// photos.
/// </param>
///
/// <returns>
/// A GraphMLXmlDocument representing a network of Flickr related tags.
/// The document includes GraphML-attribute definitions but no vertices or
/// edges.
/// </returns>
//*************************************************************************
protected GraphMLXmlDocument CreateGraphMLXmlDocument(
Boolean bIncludeSampleThumbnails
)
{
AssertValid();
GraphMLXmlDocument oGraphMLXmlDocument = new GraphMLXmlDocument(true);
DefineLabelGraphMLAttribute(oGraphMLXmlDocument);
DefineCustomMenuGraphMLAttributes(oGraphMLXmlDocument);
if (bIncludeSampleThumbnails)
{
DefineImageFileGraphMLAttribute(oGraphMLXmlDocument);
}
return (oGraphMLXmlDocument);
}
//*************************************************************************
// Method: GetRelatedTagsRecursive()
//
/// <summary>
/// Recursively gets a tag's related tags.
/// </summary>
///
/// <param name="sTag">
/// Tag to get related tags for.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="eNetworkLevel">
/// Network level to include. Must be NetworkLevel.One, OnePointFive, or
/// Two.
/// </param>
///
/// <param name="sApiKey">
/// Flickr API key.
/// </param>
///
/// <param name="iRecursionLevel">
/// Recursion level for this call. Must be 1 or 2. Gets incremented when
/// recursing.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oTagDictionary">
/// The key is the tag name and the value is the corresponding GraphML XML
/// node that represents the tag.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void GetRelatedTagsRecursive(
String sTag,
WhatToInclude eWhatToInclude,
NetworkLevel eNetworkLevel,
String sApiKey,
Int32 iRecursionLevel,
GraphMLXmlDocument oGraphMLXmlDocument,
Dictionary<String, XmlNode> oTagDictionary,
RequestStatistics oRequestStatistics
)
{
Debug.Assert( !String.IsNullOrEmpty(sTag) );
Debug.Assert(eNetworkLevel == NetworkLevel.One ||
eNetworkLevel == NetworkLevel.OnePointFive ||
eNetworkLevel == NetworkLevel.Two);
Debug.Assert( !String.IsNullOrEmpty(sApiKey) );
Debug.Assert(iRecursionLevel == 1 || iRecursionLevel == 2);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oTagDictionary != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
/*
Here is what this method should do, based on the eNetworkLevel and
iRecursionLevel parameters.
eNetworkLevel
|One | OnePointFive | Two
---|------------------| ------------------| -----------------
i 1 |Add all vertices. | Add all vertices. | Add all vertices.
R | | |
e |Add all edges. | Add all edges. | Add all edges.
c | | |
u |Do not recurse. | Recurse. | Recurse.
r | | |
s ---|------------------|-------------------|------------------
i 2 |Impossible. | Do not add | Add all vertices.
o | | vertices. |
n | | |
L | | Add edges only if | Add all edges.
e | | vertices are |
v | | already included. |
e | | |
l | | Do not recurse. | Do not recurse.
| | |
---|------------------|-------------------|------------------
*/
Boolean bNeedToRecurse = GetNeedToRecurse(eNetworkLevel,
iRecursionLevel);
Boolean bNeedToAppendVertices = GetNeedToAppendVertices(
eNetworkLevel, iRecursionLevel);
ReportProgress("Getting tags related to \"" + sTag + "\".");
String sUrl = GetFlickrMethodUrl( "flickr.tags.getRelated", sApiKey,
"&tag=" + UrlUtil.EncodeUrlParameter(sTag) );
XmlDocument oXmlDocument;
try
{
oXmlDocument = GetXmlDocument(sUrl, oRequestStatistics);
}
catch (Exception oException)
{
// If the exception is not a WebException or XmlException, or if
// none of the network has been obtained yet, throw the exception.
if (!ExceptionIsWebOrXml(oException) ||
!oGraphMLXmlDocument.HasVertexXmlNode)
{
throw oException;
}
return;
}
// The document consists of a single "tags" node with zero or more
// "tag" child nodes.
String sOtherTag = null;
XmlNodeList oTagNodes = oXmlDocument.DocumentElement.SelectNodes(
"tags/tag");
if (oTagNodes.Count > 0)
{
AppendVertexXmlNode(sTag, oGraphMLXmlDocument, oTagDictionary);
}
foreach (XmlNode oTagNode in oTagNodes)
{
sOtherTag = XmlUtil2.SelectRequiredSingleNodeAsString(oTagNode,
"text()", null);
if (bNeedToAppendVertices)
{
AppendVertexXmlNode(sOtherTag, oGraphMLXmlDocument,
oTagDictionary);
}
if ( bNeedToAppendVertices ||
oTagDictionary.ContainsKey(sOtherTag) )
{
oGraphMLXmlDocument.AppendEdgeXmlNode(sTag, sOtherTag);
}
}
if (bNeedToRecurse)
{
foreach (XmlNode oTagNode in oTagNodes)
{
sOtherTag = XmlUtil2.SelectRequiredSingleNodeAsString(oTagNode,
"text()", null);
GetRelatedTagsRecursive(sOtherTag, eWhatToInclude,
eNetworkLevel, sApiKey, 2, oGraphMLXmlDocument,
oTagDictionary, oRequestStatistics);
}
}
}
//*************************************************************************
// Method: AppendVertexXmlNodes()
//
/// <summary>
/// Appends a vertex XML node for each person who has tweeted a specified
/// search term.
/// </summary>
///
/// <param name="sSearchTerm">
/// The term to search for.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="iMaximumPeoplePerRequest">
/// Maximum number of people to request for each query, or Int32.MaxValue
/// for no limit.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// The GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oScreenNameDictionary">
/// The key is the screen name in lower case and the value is the
/// corresponding TwitterVertex.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void AppendVertexXmlNodes(
String sSearchTerm,
WhatToInclude eWhatToInclude,
Int32 iMaximumPeoplePerRequest,
GraphMLXmlDocument oGraphMLXmlDocument,
Dictionary<String, TwitterVertex> oScreenNameDictionary,
RequestStatistics oRequestStatistics
)
{
Debug.Assert( !String.IsNullOrEmpty(sSearchTerm) );
Debug.Assert(iMaximumPeoplePerRequest > 0);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oScreenNameDictionary != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
// Convert spaces in the search term to a plus sign.
//
// (Note: Don't try to use Twitter's "show_user" URL parameter in an
// attempt to get a "user" XML node for each author. That's not what
// the URL parameter does.)
String sUrl = String.Format(
"http://search.twitter.com/search.atom?q={0}&rpp=100"
,
UrlUtil.EncodeUrlParameter(sSearchTerm).Replace("%20", "+")
);
ReportProgress("Getting a list of tweets.");
Boolean bIncludeStatistics = WhatToIncludeFlagIsSet(
eWhatToInclude, WhatToInclude.Statistics);
Boolean bIncludeStatuses = WhatToIncludeFlagIsSet(
eWhatToInclude, WhatToInclude.Statuses);
// The document consists of an "entry" XML node for each tweet that
// contains the search term. Multiple tweets may have the same author,
// so we have to enumerate until the requested maximum number of unique
// authors is reached.
foreach ( XmlNode oAuthorNameXmlNode in EnumerateXmlNodes(
sUrl, "a:feed/a:entry/a:author/a:name", "a", AtomNamespaceUri,
15, Int32.MaxValue, true, false, oRequestStatistics) )
{
if (oScreenNameDictionary.Count == iMaximumPeoplePerRequest)
{
break;
}
// The author name is in this format:
//
// james_laker (James Laker)
String sAuthorName;
if ( !XmlUtil2.TrySelectSingleNodeAsString(oAuthorNameXmlNode,
"text()", null, out sAuthorName) )
{
continue;
}
Int32 iIndexOfSpace = sAuthorName.IndexOf(' ');
String sScreenName = sAuthorName;
if (iIndexOfSpace != -1)
{
sScreenName = sAuthorName.Substring(0, iIndexOfSpace);
}
sScreenName = sScreenName.ToLower();
TwitterVertex oTwitterVertex;
if ( !TryAppendVertexXmlNode(sScreenName, null,
oGraphMLXmlDocument, oScreenNameDictionary, bIncludeStatistics,
false, out oTwitterVertex) )
{
// A tweet for the author has already been found.
continue;
}
XmlNode oVertexXmlNode = oTwitterVertex.VertexXmlNode;
XmlNode oEntryXmlNode = oAuthorNameXmlNode.ParentNode.ParentNode;
XmlNamespaceManager oXmlNamespaceManager = new XmlNamespaceManager(
oEntryXmlNode.OwnerDocument.NameTable);
oXmlNamespaceManager.AddNamespace("a", AtomNamespaceUri);
// Get the image URL and status for the tweet's author.
AppendStringGraphMLAttributeValue(oEntryXmlNode,
"a:link[@rel='image']/@href", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, ImageFileID);
String sStatus;
if ( XmlUtil2.TrySelectSingleNodeAsString(oEntryXmlNode,
"a:title/text()", oXmlNamespaceManager, out sStatus) )
{
String sStatusDateUtc;
if ( XmlUtil2.TrySelectSingleNodeAsString(oEntryXmlNode,
"a:published/text()", oXmlNamespaceManager,
out sStatusDateUtc) )
{
sStatusDateUtc = TwitterDateParser.ParseTwitterDate(
sStatusDateUtc);
}
oTwitterVertex.StatusForAnalysis = sStatus;
oTwitterVertex.StatusForAnalysisDateUtc = sStatusDateUtc;
if (bIncludeStatuses)
{
oGraphMLXmlDocument.AppendGraphMLAttributeValue(
oVertexXmlNode, StatusID, sStatus);
if ( !String.IsNullOrEmpty(sStatusDateUtc) )
{
oGraphMLXmlDocument.AppendGraphMLAttributeValue(
oVertexXmlNode, StatusDateUtcID, sStatusDateUtc);
}
}
}
}
}
//*************************************************************************
// Method: AppendSampleThumbnails()
//
/// <summary>
/// Appends sample thumbnails to the GraphMLXmlDocument being populated.
/// </summary>
///
/// <param name="oTagDictionary">
/// The key is the tag name and the value is the corresponding GraphML XML
/// node that represents the tag.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="sApiKey">
/// Flickr API key.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void AppendSampleThumbnails(
Dictionary<String, XmlNode> oTagDictionary,
GraphMLXmlDocument oGraphMLXmlDocument,
String sApiKey,
RequestStatistics oRequestStatistics
)
{
Debug.Assert(oTagDictionary != null);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert( !String.IsNullOrEmpty(sApiKey) );
Debug.Assert(oRequestStatistics != null);
AssertValid();
foreach (KeyValuePair<String, XmlNode> oKeyValuePair in oTagDictionary)
{
String sTag = oKeyValuePair.Key;
ReportProgress("Getting sample image file for \"" + sTag + "\".");
String sSampleImageUrl;
if ( TryGetSampleImageUrl(sTag, sApiKey, oRequestStatistics,
out sSampleImageUrl) )
{
oGraphMLXmlDocument.AppendGraphMLAttributeValue(
oKeyValuePair.Value, ImageFileID, sSampleImageUrl);
}
}
}
//*************************************************************************
// Method: DefineImageFileGraphMLAttribute()
//
/// <summary>
/// Defines a GraphML-Attribute for vertex image files.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
//*************************************************************************
protected void DefineImageFileGraphMLAttribute(
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
oGraphMLXmlDocument.DefineGraphMLAttribute(false, ImageFileID,
ImageColumnName, "string", null);
}
//*************************************************************************
// Method: DefineLabelGraphMLAttribute()
//
/// <summary>
/// Defines a GraphML-Attribute for vertex labels.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
//*************************************************************************
protected void DefineLabelGraphMLAttribute(
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
oGraphMLXmlDocument.DefineGraphMLAttribute(false, LabelID,
LabelColumnName, "string", null);
}
//*************************************************************************
// Method: AppendStringGraphMLAttributeValue()
//
/// <summary>
/// Appends a String GraphML-Attribute value to an edge or vertex XML node.
/// </summary>
///
/// <param name="oXmlNodeToSelectFrom">
/// Node to select from.
/// </param>
///
/// <param name="sXPath">
/// XPath expression to a String descendant of <paramref
/// name="oXmlNodeToSelectFrom" />.
/// </param>
///
/// <param name="oXmlNamespaceManager">
/// NamespaceManager to use, or null to not use one.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oEdgeOrVertexXmlNode">
/// The edge or vertex XML node from <paramref
/// name="oGraphMLXmlDocument" /> to add the GraphML attribute value to.
/// </param>
///
/// <param name="sGraphMLAttributeID">
/// GraphML ID of the attribute.
/// </param>
///
/// <returns>
/// true if the GraphML-Attribute was appended.
/// </returns>
///
/// <remarks>
/// This method selects from <paramref name="oXmlNodeToSelectFrom" /> using
/// the <paramref name="sXPath" /> expression. If the selection is
/// successful, the specified String value gets stored on <paramref
/// name="oEdgeOrVertexXmlNode" /> as a Graph-ML Attribute.
/// </remarks>
//*************************************************************************
protected Boolean AppendStringGraphMLAttributeValue(
XmlNode oXmlNodeToSelectFrom,
String sXPath,
XmlNamespaceManager oXmlNamespaceManager,
GraphMLXmlDocument oGraphMLXmlDocument,
XmlNode oEdgeOrVertexXmlNode,
String sGraphMLAttributeID
)
{
Debug.Assert(oXmlNodeToSelectFrom != null);
Debug.Assert( !String.IsNullOrEmpty(sXPath) );
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oEdgeOrVertexXmlNode != null);
Debug.Assert( !String.IsNullOrEmpty(sGraphMLAttributeID) );
AssertValid();
String sAttributeValue;
if ( XmlUtil2.TrySelectSingleNodeAsString(oXmlNodeToSelectFrom, sXPath,
oXmlNamespaceManager, out sAttributeValue) )
{
oGraphMLXmlDocument.AppendGraphMLAttributeValue(
oEdgeOrVertexXmlNode, sGraphMLAttributeID, sAttributeValue);
return (true);
}
return (false);
}
//*************************************************************************
// Method: DefineCustomMenuGraphMLAttributes()
//
/// <summary>
/// Defines the GraphML-Attributes for custom menu items.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
//*************************************************************************
protected void DefineCustomMenuGraphMLAttributes(
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
oGraphMLXmlDocument.DefineGraphMLAttribute(false, MenuTextID,
MenuTextColumnName, "string", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, MenuActionID,
MenuActionColumnName, "string", null);
}
//*************************************************************************
// Method: AppendEdgeXmlNode()
//
/// <summary>
/// Appends an edge XML node to a GraphML document.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="sVertex1ID">
/// ID of the edge's first vertex.
/// </param>
///
/// <param name="sVertex2ID">
/// ID of the edge's second vertex.
/// </param>
///
/// <param name="sRelationship">
/// The value of the edge's RelationshipID GraphML-attribute.
/// </param>
///
/// <returns>
/// The new edge XML node.
/// </returns>
//*************************************************************************
protected XmlNode AppendEdgeXmlNode(
GraphMLXmlDocument oGraphMLXmlDocument,
String sVertex1ID,
String sVertex2ID,
String sRelationship
)
{
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert( !String.IsNullOrEmpty(sVertex1ID) );
Debug.Assert( !String.IsNullOrEmpty(sVertex2ID) );
Debug.Assert( !String.IsNullOrEmpty(sRelationship) );
AssertValid();
XmlNode oEdgeXmlNode = oGraphMLXmlDocument.AppendEdgeXmlNode(
sVertex1ID, sVertex2ID);
oGraphMLXmlDocument.AppendGraphMLAttributeValue(oEdgeXmlNode,
RelationshipID, sRelationship);
return (oEdgeXmlNode);
}
//*************************************************************************
// Method: OnNetworkObtainedWithoutTerminatingException()
//
/// <summary>
/// Call this when part or all of the network has been obtained without a
/// terminating exception occurring.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
///
/// <remarks>
/// If the entire network has been obtained, this method does nothing.
/// Otherwise, a PartialNetworkException is thrown.
/// </remarks>
//*************************************************************************
protected void OnNetworkObtainedWithoutTerminatingException(
GraphMLXmlDocument oGraphMLXmlDocument,
RequestStatistics oRequestStatistics
)
{
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
if (oRequestStatistics.UnexpectedExceptions > 0)
{
// The network is partial.
throw new PartialNetworkException(oGraphMLXmlDocument,
oRequestStatistics);
}
}
//*************************************************************************
// Method: GetUserNetworkRecursive()
//
/// <summary>
/// Recursively gets a network of Twitter users.
/// </summary>
///
/// <param name="sScreenName">
/// The screen name to use in this call.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="bIncludeFollowedThisCall">
/// true to include the people followed by the user, false to include the
/// people following the user.
/// </param>
///
/// <param name="eNetworkLevel">
/// Network level to include. Must be NetworkLevel.One, OnePointFive, or
/// Two.
/// </param>
///
/// <param name="iMaximumPeoplePerRequest">
/// Maximum number of people to request for each query, or Int32.MaxValue
/// for no limit.
/// </param>
///
/// <param name="iRecursionLevel">
/// Recursion level for this call. Must be 1 or 2. Gets incremented when
/// recursing.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oScreenNameDictionary">
/// The key is the screen name in lower case and the value is the
/// corresponding TwitterVertex.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void GetUserNetworkRecursive(
String sScreenName,
WhatToInclude eWhatToInclude,
Boolean bIncludeFollowedThisCall,
NetworkLevel eNetworkLevel,
Int32 iMaximumPeoplePerRequest,
Int32 iRecursionLevel,
GraphMLXmlDocument oGraphMLXmlDocument,
Dictionary<String, TwitterVertex> oScreenNameDictionary,
RequestStatistics oRequestStatistics
)
{
Debug.Assert( !String.IsNullOrEmpty(sScreenName) );
Debug.Assert(eNetworkLevel == NetworkLevel.One ||
eNetworkLevel == NetworkLevel.OnePointFive ||
eNetworkLevel == NetworkLevel.Two);
Debug.Assert(iMaximumPeoplePerRequest > 0);
Debug.Assert(iRecursionLevel == 1 || iRecursionLevel == 2);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oScreenNameDictionary != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
/*
Here is what this method should do, based on the eNetworkLevel and
iRecursionLevel parameters. It's assumed that
eWhatToInclude.FollowedFollowerEdge is set.
eNetworkLevel
|One | OnePointFive | Two
---|------------------| ------------------| -----------------
i 1 |Add all vertices. | Add all vertices. | Add all vertices.
R | | |
e |Add all edges. | Add all edges. | Add all edges.
c | | |
u |Do not recurse. | Recurse. | Recurse.
r | | |
s ---|------------------|-------------------|------------------
i 2 |Impossible. | Do not add | Add all vertices.
o | | vertices. |
n | | |
L | | Add edges only if | Add all edges.
e | | vertices are |
v | | already included. |
e | | |
l | | Do not recurse. | Do not recurse.
| | |
---|------------------|-------------------|------------------
*/
Boolean bNeedToRecurse = GetNeedToRecurse(eNetworkLevel,
iRecursionLevel);
List<String> oScreenNamesToRecurse = new List<String>();
Boolean bIncludeLatestStatuses = WhatToIncludeFlagIsSet(
eWhatToInclude, WhatToInclude.LatestStatuses);
ReportProgressForFollowedOrFollowing(sScreenName,
bIncludeFollowedThisCall);
Boolean bThisUserAppended = false;
// If the GraphMLXmlDocument already contains at least one vertex node,
// then this is the second time that this method has been called, a
// partial network has already been obtained, and most errors should
// now be skipped. However, if none of the network has been obtained
// yet, errors on page 1 should throw an immediate exception.
Boolean bSkipMostPage1Errors = oGraphMLXmlDocument.HasVertexXmlNode;
// The document consists of a single "users" node with zero or more
// "user" child nodes.
foreach ( XmlNode oUserXmlNode in EnumerateXmlNodes(
GetFollowedOrFollowingUrl(sScreenName, bIncludeFollowedThisCall),
"users_list/users/user", null, null, Int32.MaxValue,
iMaximumPeoplePerRequest, false, bSkipMostPage1Errors,
oRequestStatistics) )
{
String sOtherScreenName;
if ( !TryGetScreenName(oUserXmlNode, out sOtherScreenName) )
{
// Nothing can be done without a screen name.
continue;
}
if (!bThisUserAppended)
{
// Append a vertex node for this request's user.
//
// This used to be done after the foreach loop, which avoided
// the need for a "bThisUserAppended" flag. That caused the
// following bug: If a Twitter error occurred within
// EnumerateXmlNodes() after some edges had been added, and the
// user decided to import the resulting partial network, the
// GraphML might contain edges that referenced "this user"
// without containing a vertex for "this user." That is an
// illegal state for GraphML, which the ExcelTemplate project
// caught and reported as an error.
TryAppendVertexXmlNode(sScreenName, null, oGraphMLXmlDocument,
oScreenNameDictionary, true, bIncludeLatestStatuses);
bThisUserAppended = true;
}
Boolean bNeedToAppendVertices = GetNeedToAppendVertices(
eNetworkLevel, iRecursionLevel);
if (bNeedToAppendVertices)
{
if (
TryAppendVertexXmlNode(sOtherScreenName, oUserXmlNode,
oGraphMLXmlDocument, oScreenNameDictionary, true,
bIncludeLatestStatuses)
&&
bNeedToRecurse
)
{
oScreenNamesToRecurse.Add(sOtherScreenName);
}
}
if ( WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.FollowedFollowerEdges) )
{
if ( bNeedToAppendVertices ||
oScreenNameDictionary.ContainsKey(sOtherScreenName) )
{
XmlNode oEdgeXmlNode;
if (bIncludeFollowedThisCall)
{
oEdgeXmlNode = AppendEdgeXmlNode(oGraphMLXmlDocument,
sScreenName, sOtherScreenName, "Followed");
}
else
{
oEdgeXmlNode = AppendEdgeXmlNode(oGraphMLXmlDocument,
sOtherScreenName, sScreenName, "Follower");
}
AppendRelationshipDateUtcGraphMLAttributeValue(
oGraphMLXmlDocument, oEdgeXmlNode, oRequestStatistics);
}
}
}
if (bNeedToRecurse)
{
foreach (String sScreenNameToRecurse in oScreenNamesToRecurse)
{
GetUserNetworkRecursive(sScreenNameToRecurse, eWhatToInclude,
bIncludeFollowedThisCall, eNetworkLevel,
iMaximumPeoplePerRequest, 2, oGraphMLXmlDocument,
oScreenNameDictionary, oRequestStatistics);
}
}
}
//*************************************************************************
// Method: GetUserNetworkRecursive()
//
/// <summary>
/// Recursively gets a network of YouTube users.
/// </summary>
///
/// <param name="sUserName">
/// The user name to use in this call.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="bIncludeFriendsThisCall">
/// true to include the user's friends, false to include the people
/// subscribed to by the user.
/// </param>
///
/// <param name="eNetworkLevel">
/// Network level to include. Must be NetworkLevel.One, OnePointFive, or
/// Two.
/// </param>
///
/// <param name="iMaximumPeoplePerRequest">
/// Maximum number of people to request for each query, or Int32.MaxValue
/// for no limit.
/// </param>
///
/// <param name="iRecursionLevel">
/// Recursion level for this call. Must be 1 or 2. Gets incremented when
/// recursing.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oUserNameDictionary">
/// The key is the user name and the value is the corresponding GraphML XML
/// node that represents the user.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void GetUserNetworkRecursive(
String sUserName,
WhatToInclude eWhatToInclude,
Boolean bIncludeFriendsThisCall,
NetworkLevel eNetworkLevel,
Int32 iMaximumPeoplePerRequest,
Int32 iRecursionLevel,
GraphMLXmlDocument oGraphMLXmlDocument,
Dictionary<String, XmlNode> oUserNameDictionary,
RequestStatistics oRequestStatistics
)
{
Debug.Assert( !String.IsNullOrEmpty(sUserName) );
Debug.Assert(eNetworkLevel == NetworkLevel.One ||
eNetworkLevel == NetworkLevel.OnePointFive ||
eNetworkLevel == NetworkLevel.Two);
Debug.Assert(iMaximumPeoplePerRequest > 0);
Debug.Assert(iRecursionLevel == 1 || iRecursionLevel == 2);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oUserNameDictionary != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
/*
Here is what this method should do, based on the eNetworkLevel and
iRecursionLevel parameters.
eNetworkLevel
|One | OnePointFive | Two
---|------------------| ------------------| -----------------
i 1 |Add all vertices. | Add all vertices. | Add all vertices.
R | | |
e |Add all edges. | Add all edges. | Add all edges.
c | | |
u |Do not recurse. | Recurse. | Recurse.
r | | |
s ---|------------------|-------------------|------------------
i 2 |Impossible. | Do not add | Add all vertices.
o | | vertices. |
n | | |
L | | Add edges only if | Add all edges.
e | | vertices are |
v | | already included. |
e | | |
l | | Do not recurse. | Do not recurse.
| | |
---|------------------|-------------------|------------------
*/
Boolean bNeedToRecurse = GetNeedToRecurse(eNetworkLevel,
iRecursionLevel);
List<String> oUserNamesToRecurse = new List<String>();
ReportProgressForFriendsOrSubscriptions(sUserName,
bIncludeFriendsThisCall);
Boolean bThisUserAppended = false;
// If the GraphMLXmlDocument already contains at least one vertex node,
// then this is the second time that this method has been called, a
// partial network has already been obtained, and most errors should
// now be skipped. However, if none of the network has been obtained
// yet, errors on page 1 should throw an immediate exception.
Boolean bSkipMostPage1Errors = oGraphMLXmlDocument.HasVertexXmlNode;
// The document consists of a single "feed" node with zero or more
// "entry" child nodes.
foreach ( XmlNode oEntryXmlNode in EnumerateXmlNodes(
GetFriendsOrSubscriptionsUrl(sUserName, bIncludeFriendsThisCall),
"a:feed/a:entry", iMaximumPeoplePerRequest, bSkipMostPage1Errors,
oRequestStatistics) )
{
XmlNamespaceManager oXmlNamespaceManager =
CreateXmlNamespaceManager(oEntryXmlNode.OwnerDocument);
String sOtherUserName;
if ( !XmlUtil2.TrySelectSingleNodeAsString(oEntryXmlNode,
"yt:username/text()", oXmlNamespaceManager,
out sOtherUserName) )
{
continue;
}
if (!bThisUserAppended)
{
// Append a vertex node for this request's user.
//
// This used to be done after the foreach loop, which avoided
// the need for a "bThisUserAppended" flag. That caused the
// following bug: If a YouTube error occurred within
// EnumerateXmlNodes() after some edges had been added, and the
// user decided to import the resulting partial network, the
// GraphML might contain edges that referenced "this user"
// without containing a vertex for "this user." That is an
// illegal state for GraphML, which the ExcelTemplate project
// caught and reported as an error.
TryAppendVertexXmlNode(sUserName, null, oGraphMLXmlDocument,
oUserNameDictionary);
bThisUserAppended = true;
}
Boolean bNeedToAppendVertices = GetNeedToAppendVertices(
eNetworkLevel, iRecursionLevel);
if (bNeedToAppendVertices)
{
if (
TryAppendVertexXmlNode(sOtherUserName, oEntryXmlNode,
oGraphMLXmlDocument, oUserNameDictionary)
&&
bNeedToRecurse
)
{
oUserNamesToRecurse.Add(sOtherUserName);
}
}
if ( bNeedToAppendVertices ||
oUserNameDictionary.ContainsKey(sOtherUserName) )
{
String sRelationship;
if (bIncludeFriendsThisCall)
{
sRelationship = "Friend of";
}
else
{
sRelationship = "Subscribes to";
String sSubscriptionType = null;
if ( XmlUtil2.TrySelectSingleNodeAsString(oEntryXmlNode,
"a:category[@scheme='http://gdata.youtube.com/schemas/"
+ "2007/subscriptiontypes.cat']/@term",
oXmlNamespaceManager, out sSubscriptionType) )
{
sRelationship += " " + sSubscriptionType;
}
}
AppendEdgeXmlNode(oGraphMLXmlDocument, sUserName,
sOtherUserName, sRelationship);
}
}
if (bNeedToRecurse)
{
foreach (String sUserNameToRecurse in oUserNamesToRecurse)
{
GetUserNetworkRecursive(sUserNameToRecurse,
eWhatToInclude, bIncludeFriendsThisCall, eNetworkLevel,
iMaximumPeoplePerRequest, 2, oGraphMLXmlDocument,
oUserNameDictionary, oRequestStatistics);
}
}
}
//*************************************************************************
// Method: DefineRelationshipGraphMLAttribute()
//
/// <summary>
/// Defines a GraphML-Attribute for edge relationships.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
//*************************************************************************
protected void DefineRelationshipGraphMLAttribute(
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
oGraphMLXmlDocument.DefineGraphMLAttribute(true, RelationshipID,
"Relationship", "string", null);
}
//*************************************************************************
// Method: AppendFollowedEdgeXmlNodes()
//
/// <summary>
/// Appends an edge XML node for each pair of people who have tweeted a
/// specified search term and one follows the other.
/// </summary>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="iMaximumPeoplePerRequest">
/// Maximum number of people to request for each query, or Int32.MaxValue
/// for no limit.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oScreenNameDictionary">
/// The key is the screen name in lower case and the value is the
/// corresponding TwitterVertex.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void AppendFollowedEdgeXmlNodes(
WhatToInclude eWhatToInclude,
Int32 iMaximumPeoplePerRequest,
GraphMLXmlDocument oGraphMLXmlDocument,
Dictionary<String, TwitterVertex> oScreenNameDictionary,
RequestStatistics oRequestStatistics
)
{
Debug.Assert(iMaximumPeoplePerRequest > 0);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oScreenNameDictionary != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
Boolean bIncludeStatistics = WhatToIncludeFlagIsSet(
eWhatToInclude, WhatToInclude.Statistics);
// Look at the people followed by each author, and if a followed has
// also tweeted the search term, add an edge between the author and the
// followed.
foreach (String sScreenName in oScreenNameDictionary.Keys)
{
ReportProgressForFollowedOrFollowing(sScreenName, true);
foreach ( XmlNode oOtherUserXmlNode in EnumerateXmlNodes(
GetFollowedOrFollowingUrl(sScreenName, true),
"users_list/users/user", null, null, Int32.MaxValue,
iMaximumPeoplePerRequest, false, true, oRequestStatistics) )
{
String sOtherScreenName;
if ( !TryGetScreenName(oOtherUserXmlNode,
out sOtherScreenName) )
{
continue;
}
TwitterVertex oOtherTwitterVertex;
if ( oScreenNameDictionary.TryGetValue(sOtherScreenName,
out oOtherTwitterVertex) )
{
XmlNode oOtherVertexXmlNode =
oOtherTwitterVertex.VertexXmlNode;
XmlNode oEdgeXmlNode = AppendEdgeXmlNode(
oGraphMLXmlDocument, sScreenName, sOtherScreenName,
"Followed");
AppendRelationshipDateUtcGraphMLAttributeValue(
oGraphMLXmlDocument, oEdgeXmlNode, oRequestStatistics);
if (bIncludeStatistics &&
!AppendFromUserXmlNodeCalled(oGraphMLXmlDocument,
oOtherVertexXmlNode) )
{
// The other vertex node has no statistics. Add them.
AppendFromUserXmlNode(oOtherUserXmlNode,
oGraphMLXmlDocument, oOtherTwitterVertex,
bIncludeStatistics, false);
}
}
}
}
}
//*************************************************************************
// Method: TryAppendVertexXmlNode()
//
/// <summary>
/// Appends a vertex XML node to the GraphML document for a user if such a
/// node doesn't already exist.
/// </summary>
///
/// <param name="sUserName">
/// User name to add a vertex XML node for.
/// </param>
///
/// <param name="oEntryXmlNode">
/// The "entry" XML node returned by YouTube, or null if an entry node
/// isn't available.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oUserNameDictionary">
/// The key is the user name and the value is the corresponding GraphML XML
/// node that represents the user.
/// </param>
///
/// <returns>
/// true if a vertex XML node was added, false if a vertex XML node already
/// exists.
/// </returns>
//*************************************************************************
protected Boolean TryAppendVertexXmlNode(
String sUserName,
XmlNode oEntryXmlNode,
GraphMLXmlDocument oGraphMLXmlDocument,
Dictionary<String, XmlNode> oUserNameDictionary
)
{
Debug.Assert( !String.IsNullOrEmpty(sUserName) );
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oUserNameDictionary != null);
XmlNode oVertexXmlNode;
if ( oUserNameDictionary.TryGetValue(sUserName, out oVertexXmlNode) )
{
return (false);
}
oVertexXmlNode = oGraphMLXmlDocument.AppendVertexXmlNode(sUserName);
oUserNameDictionary.Add(sUserName, oVertexXmlNode);
oGraphMLXmlDocument.AppendGraphMLAttributeValue(oVertexXmlNode,
MenuTextID, "Open YouTube Page for This Person");
oGraphMLXmlDocument.AppendGraphMLAttributeValue( oVertexXmlNode,
MenuActionID, String.Format(WebPageUrlPattern, sUserName) );
return (true);
}
//*************************************************************************
// Method: GetSearchNetworkInternal()
//
/// <summary>
/// Gets the network of people who have tweeted a specified search term,
/// given a GraphMLXmlDocument.
/// </summary>
///
/// <param name="sSearchTerm">
/// The term to search for.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="iMaximumPeoplePerRequest">
/// Maximum number of people to request for each query, or Int32.MaxValue
/// for no limit.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// The GraphMLXmlDocument to populate with the requested network.
/// </param>
//*************************************************************************
protected void GetSearchNetworkInternal(
String sSearchTerm,
WhatToInclude eWhatToInclude,
Int32 iMaximumPeoplePerRequest,
RequestStatistics oRequestStatistics,
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert( !String.IsNullOrEmpty(sSearchTerm) );
Debug.Assert(iMaximumPeoplePerRequest > 0);
Debug.Assert(oRequestStatistics != null);
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
if ( WhatToIncludeFlagIsSet(eWhatToInclude, WhatToInclude.Statuses) )
{
oGraphMLXmlDocument.DefineGraphMLAttribute(false, StatusID,
"Tweet", "string", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, StatusDateUtcID,
"Tweet Date (UTC)", "string", null);
}
// The key is the screen name and the value is the corresponding
// TwitterVertex. This is used to prevent the same screen name from
// being added to the XmlDocument twice.
Dictionary<String, TwitterVertex> oScreenNameDictionary =
new Dictionary<String, TwitterVertex>();
// First, add a vertex for each person who has tweeted the search term.
AppendVertexXmlNodes(sSearchTerm, eWhatToInclude,
iMaximumPeoplePerRequest, oGraphMLXmlDocument,
oScreenNameDictionary, oRequestStatistics);
if ( WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.FollowedEdges) )
{
// Look at the people followed by each author, and if a followed
// has also tweeted the search term, add an edge between the author
// and the followed.
AppendFollowedEdgeXmlNodes(eWhatToInclude,
iMaximumPeoplePerRequest, oGraphMLXmlDocument,
oScreenNameDictionary, oRequestStatistics);
}
Boolean bIncludeStatistics = WhatToIncludeFlagIsSet(
eWhatToInclude, WhatToInclude.Statistics);
AppendMissingGraphMLAttributeValues(oGraphMLXmlDocument,
oScreenNameDictionary, bIncludeStatistics, false,
oRequestStatistics);
AppendRepliesToAndMentionsXmlNodes(oGraphMLXmlDocument,
oScreenNameDictionary,
WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.RepliesToEdges),
WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.MentionsEdges)
);
}
//*************************************************************************
// Method: AppendAllStatisticGraphMLAttributeValues()
//
/// <overloads>
/// Appends statistic GraphML attribute values to the GraphML document.
/// </overloads>
///
/// <summary>
/// Appends statistic GraphML attribute values to the GraphML document for
/// all users in the network.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oUserNameDictionary">
/// The key is the user name and the value is the corresponding GraphML XML
/// node that represents the user.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void AppendAllStatisticGraphMLAttributeValues(
GraphMLXmlDocument oGraphMLXmlDocument,
Dictionary<String, XmlNode> oUserNameDictionary,
RequestStatistics oRequestStatistics
)
{
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oUserNameDictionary != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
foreach (KeyValuePair<String, XmlNode> oKeyValuePair in
oUserNameDictionary)
{
String sUserName = oKeyValuePair.Key;
ReportProgress( String.Format(
"Getting statistics for \"{0}\"."
,
sUserName
) );
AppendAllStatisticGraphMLAttributeValues(sUserName,
oKeyValuePair.Value, oGraphMLXmlDocument, oRequestStatistics);
}
}
//*************************************************************************
// Method: AppendVertexXmlNode()
//
/// <summary>
/// Appends a vertex XML node to the document for a tag if such a node
/// doesn't already exist.
/// </summary>
///
/// <param name="sTag">
/// Tag to add a vertex XML node for.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oTagDictionary">
/// The key is the tag name and the value is the corresponding GraphML XML
/// node that represents the tag.
/// </param>
//*************************************************************************
protected void AppendVertexXmlNode(
String sTag,
GraphMLXmlDocument oGraphMLXmlDocument,
Dictionary<String, XmlNode> oTagDictionary
)
{
Debug.Assert( !String.IsNullOrEmpty(sTag) );
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oTagDictionary != null);
if ( !oTagDictionary.ContainsKey(sTag) )
{
XmlNode oVertexXmlNode = oGraphMLXmlDocument.AppendVertexXmlNode(
sTag);
oGraphMLXmlDocument.AppendGraphMLAttributeValue(oVertexXmlNode,
LabelID, sTag);
oGraphMLXmlDocument.AppendGraphMLAttributeValue(oVertexXmlNode,
MenuTextID, "Open Flickr Page for This Tag");
oGraphMLXmlDocument.AppendGraphMLAttributeValue( oVertexXmlNode,
MenuActionID,
String.Format(
"http://www.flickr.com/photos/tags/{0}/"
,
UrlUtil.EncodeUrlParameter(sTag)
) );
oTagDictionary.Add(sTag, oVertexXmlNode);
}
}
//*************************************************************************
// Method: AppendAllStatisticGraphMLAttributeValues()
//
/// <summary>
/// Appends statistic GraphML attribute values to the GraphML document for
/// one user in the network.
/// </summary>
///
/// <param name="sUserName">
/// The user name.
/// </param>
///
/// <param name="oVertexXmlNode">
/// The GraphML XML node corresponding to the user.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
//*************************************************************************
protected void AppendAllStatisticGraphMLAttributeValues(
String sUserName,
XmlNode oVertexXmlNode,
GraphMLXmlDocument oGraphMLXmlDocument,
RequestStatistics oRequestStatistics
)
{
Debug.Assert( !String.IsNullOrEmpty(sUserName) );
Debug.Assert(oVertexXmlNode != null);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
XmlDocument oXmlDocument;
XmlNamespaceManager oXmlNamespaceManager;
// Some of the statistics are available in the user's profile.
String sUrl = "http://gdata.youtube.com/feeds/api/users/"
+ EncodeUrlParameter(sUserName);
if ( TryGetXmlDocument(sUrl, oRequestStatistics, out oXmlDocument,
out oXmlNamespaceManager) )
{
AppendYouTubeDateGraphMLAttributeValue(oXmlDocument,
"a:entry/a:published/text()", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, JoinedDateUtcID);
AppendStringGraphMLAttributeValue(oXmlDocument,
"a:entry/media:thumbnail/@url", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, ImageFileID);
XmlNode oStatisticsXmlNode;
if ( XmlUtil2.TrySelectSingleNode(oXmlDocument,
"a:entry/yt:statistics", oXmlNamespaceManager,
out oStatisticsXmlNode) )
{
AppendInt32GraphMLAttributeValue(oStatisticsXmlNode,
"@videoWatchCount", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, VideosWatchedID);
AppendInt32GraphMLAttributeValue(oStatisticsXmlNode,
"@subscriberCount", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, SubscribersID);
}
}
// The remaining statistics must be obtained from the totalResults
// XML node within documents obtained from other URLs.
const String TotalResultsXPath =
"a:feed/openSearch:totalResults/text()";
sUrl = GetFriendsOrSubscriptionsUrl(sUserName, true)
+ "?max-results=1";
AppendInt32GraphMLAttributeValue(sUrl, TotalResultsXPath,
oGraphMLXmlDocument, oRequestStatistics, oVertexXmlNode,
FriendsID);
sUrl = GetFriendsOrSubscriptionsUrl(sUserName, false)
+ "?max-results=1";
AppendInt32GraphMLAttributeValue(sUrl, TotalResultsXPath,
oGraphMLXmlDocument, oRequestStatistics, oVertexXmlNode,
SubscriptionsID);
sUrl = "http://gdata.youtube.com/feeds/api/users/"
+ EncodeUrlParameter(sUserName) + "/uploads?max-results=1";
AppendInt32GraphMLAttributeValue(sUrl, TotalResultsXPath,
oGraphMLXmlDocument, oRequestStatistics, oVertexXmlNode,
VideosUploadedID);
}
//*************************************************************************
// Method: GetRelatedTagsInternal()
//
/// <summary>
/// Gets the Flickr tags related to a specified tag, given a
/// GraphXMLXmlDocument.
/// </summary>
///
/// <param name="sTag">
/// Tag to get related tags for.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="eNetworkLevel">
/// Network level to include. Must be NetworkLevel.One, OnePointFive, or
/// Two.
/// </param>
///
/// <param name="sApiKey">
/// Flickr API key.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// The GraphMLXmlDocument to populate with the requested network.
/// </param>
//*************************************************************************
protected void GetRelatedTagsInternal(
String sTag,
WhatToInclude eWhatToInclude,
NetworkLevel eNetworkLevel,
String sApiKey,
RequestStatistics oRequestStatistics,
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert( !String.IsNullOrEmpty(sTag) );
Debug.Assert(eNetworkLevel == NetworkLevel.One ||
eNetworkLevel == NetworkLevel.OnePointFive ||
eNetworkLevel == NetworkLevel.Two);
Debug.Assert( !String.IsNullOrEmpty(sApiKey) );
Debug.Assert(oRequestStatistics != null);
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
// The key is the tag name and the value is the corresponding GraphML
// XML node that represents the tag. This is used to prevent the same
// tag from being added to the XmlDocument twice.
Dictionary<String, XmlNode> oTagDictionary =
new Dictionary<String, XmlNode>();
GetRelatedTagsRecursive(sTag, eWhatToInclude, eNetworkLevel, sApiKey,
1, oGraphMLXmlDocument, oTagDictionary, oRequestStatistics);
if ( WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.SampleThumbnails) )
{
AppendSampleThumbnails(oTagDictionary, oGraphMLXmlDocument,
sApiKey, oRequestStatistics);
}
}
//*************************************************************************
// Method: AppendInt32GraphMLAttributeValue()
//
/// <summary>
/// Appends an Int32 GraphML-Attribute value from an XmlDocument to a
/// vertex XML node.
/// </summary>
///
/// <param name="sUrl">
/// The URL to get the XmlDocument from.
/// </param>
///
/// <param name="sXPath">
/// Path to the value within the XmlDocument.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
///
/// <param name="oVertexXmlNode">
/// The vertex XML node from <paramref name="oGraphMLXmlDocument" /> to add
/// the GraphML attribute value to.
/// </param>
///
/// <param name="sGraphMLAttributeID">
/// GraphML ID of the attribute.
/// </param>
///
/// <remarks>
/// This method looks for an Int32 value within an XmlDocument returned by
/// YouTube and stores the value on a vertex XML node in the GraphML
/// document.
/// </remarks>
//*************************************************************************
protected void AppendInt32GraphMLAttributeValue(
String sUrl,
String sXPath,
GraphMLXmlDocument oGraphMLXmlDocument,
RequestStatistics oRequestStatistics,
XmlNode oVertexXmlNode,
String sGraphMLAttributeID
)
{
Debug.Assert( !String.IsNullOrEmpty(sUrl) );
Debug.Assert( !String.IsNullOrEmpty(sXPath) );
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oRequestStatistics != null);
Debug.Assert(oVertexXmlNode != null);
Debug.Assert( !String.IsNullOrEmpty(sGraphMLAttributeID) );
AssertValid();
XmlDocument oXmlDocument;
XmlNamespaceManager oXmlNamespaceManager;
if ( !TryGetXmlDocument(sUrl, oRequestStatistics, out oXmlDocument,
out oXmlNamespaceManager) )
{
return;
}
AppendInt32GraphMLAttributeValue(oXmlDocument, sXPath,
oXmlNamespaceManager, oGraphMLXmlDocument, oVertexXmlNode,
sGraphMLAttributeID);
}
//*************************************************************************
// Method: AppendEdgesFromDictionary()
//
/// <summary>
/// Appends an edge for each pair of videos that share the same dictionary
/// key.
/// </summary>
///
/// <param name="oGraphMLXmlDocument">
/// GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oDictionary">
/// The key is a string and the value is a LinkedList of the video IDs
/// corresponding to that key.
/// </param>
///
/// <param name="sRelationship">
/// The value of the RelationshipID GraphML-attribute to use.
/// </param>
//*************************************************************************
protected void AppendEdgesFromDictionary(
Dictionary< String, LinkedList<String> > oDictionary,
GraphMLXmlDocument oGraphMLXmlDocument,
String sRelationship
)
{
Debug.Assert(oDictionary != null);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert( !String.IsNullOrEmpty(sRelationship) );
AssertValid();
// For each key...
foreach (KeyValuePair< String, LinkedList<String> > oKeyValuePair in
oDictionary)
{
// For each video ID that has the key...
LinkedList<String> oVideoIDsWithThisKey = oKeyValuePair.Value;
for (
LinkedListNode<String> oVideoIDWithThisKey =
oVideoIDsWithThisKey.First;
oVideoIDWithThisKey != null;
oVideoIDWithThisKey = oVideoIDWithThisKey.Next
)
{
// For each of the subsequent video IDs in the LinkedList that
// have the key...
for (
LinkedListNode<String> oSubsequentVideoIDWithThisKey =
oVideoIDWithThisKey.Next;
oSubsequentVideoIDWithThisKey != null;
oSubsequentVideoIDWithThisKey =
oSubsequentVideoIDWithThisKey.Next
)
{
AppendEdgeXmlNode(oGraphMLXmlDocument,
oVideoIDWithThisKey.Value,
oSubsequentVideoIDWithThisKey.Value, sRelationship);
}
}
}
}
//*************************************************************************
// Method: CreateGraphMLXmlDocument()
//
/// <summary>
/// Creates a GraphMLXmlDocument representing a network of YouTube users.
/// </summary>
///
/// <param name="bIncludeAllStatistics">
/// true to include each user's statistics.
/// </param>
///
/// <returns>
/// A GraphMLXmlDocument representing a network of YouTube users. The
/// document includes GraphML-attribute definitions but no vertices or
/// edges.
/// </returns>
//*************************************************************************
protected GraphMLXmlDocument CreateGraphMLXmlDocument(
Boolean bIncludeAllStatistics
)
{
AssertValid();
GraphMLXmlDocument oGraphMLXmlDocument = new GraphMLXmlDocument(true);
DefineCustomMenuGraphMLAttributes(oGraphMLXmlDocument);
DefineRelationshipGraphMLAttribute(oGraphMLXmlDocument);
if (bIncludeAllStatistics)
{
oGraphMLXmlDocument.DefineGraphMLAttribute(false, FriendsID,
"Friends", "int", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, SubscriptionsID,
"People Subscribed To", "int", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, SubscribersID,
"Subscribers", "int", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, VideosWatchedID,
"Videos Watched", "int", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false,
JoinedDateUtcID, "Joined YouTube Date (UTC)", "string", null);
oGraphMLXmlDocument.DefineGraphMLAttribute(false, VideosUploadedID,
"Videos Uploaded", "int", null);
DefineImageFileGraphMLAttribute(oGraphMLXmlDocument);
}
return (oGraphMLXmlDocument);
}
//*************************************************************************
// Method: AppendVertexXmlNodes()
//
/// <summary>
/// Appends a vertex XML node for each video that matches a specified
/// search term.
/// </summary>
///
/// <param name="sSearchTerm">
/// The term to search for.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="iMaximumVideos">
/// Maximum number of videos to request, or Int32.MaxValue for no limit.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// The GraphMLXmlDocument being populated.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
///
/// <param name="oVideoIDs">
/// Where the set of unique video IDs gets stored.
/// </param>
///
/// <param name="oTagDictionary">
/// If an edge should be included for each pair of videos that share the
/// same tag, this gets set to a Dictionary for which the key is a
/// lower-case tag and the value is a LinkedList of the video IDs that have
/// the tag. Otherwise, it gets set to null.
/// </param>
//*************************************************************************
protected void AppendVertexXmlNodes(
String sSearchTerm,
WhatToInclude eWhatToInclude,
Int32 iMaximumVideos,
GraphMLXmlDocument oGraphMLXmlDocument,
RequestStatistics oRequestStatistics,
out HashSet<String> oVideoIDs,
out Dictionary< String, LinkedList<String> > oTagDictionary
)
{
Debug.Assert( !String.IsNullOrEmpty(sSearchTerm) );
Debug.Assert(iMaximumVideos> 0);
Debug.Assert(oGraphMLXmlDocument != null);
Debug.Assert(oRequestStatistics != null);
AssertValid();
ReportProgress("Getting a list of videos.");
// This is used to skip duplicate videos in the results returned by
// YouTube. (I'm not sure why YouTube sometimes returns duplicates,
// but it does.)
oVideoIDs = new HashSet<String>();
// If an edge should be included for each pair of videos that share the
// same tag, the key is a lower-case tag and the value is a LinkedList
// of the video IDs that have the tag.
if ( WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.SharedTagEdges) )
{
oTagDictionary = new Dictionary< String, LinkedList<String> >();
}
else
{
oTagDictionary = null;
}
String sUrl = String.Format(
"http://gdata.youtube.com/feeds/api/videos?q={0}"
,
EncodeUrlParameter(sSearchTerm)
);
// The document consists of an "entry" XML node for each video.
foreach ( XmlNode oEntryXmlNode in EnumerateXmlNodes(sUrl,
"a:feed/a:entry", iMaximumVideos, false, oRequestStatistics) )
{
XmlNamespaceManager oXmlNamespaceManager =
CreateXmlNamespaceManager(oEntryXmlNode.OwnerDocument);
// Use the video ID as the GraphML vertex name. The video title
// can't be used because it is not unique.
String sVideoID;
if (
!XmlUtil2.TrySelectSingleNodeAsString(oEntryXmlNode,
"media:group/yt:videoid/text()", oXmlNamespaceManager,
out sVideoID)
||
oVideoIDs.Contains(sVideoID)
)
{
continue;
}
oVideoIDs.Add(sVideoID);
XmlNode oVertexXmlNode = oGraphMLXmlDocument.AppendVertexXmlNode(
sVideoID);
AppendStringGraphMLAttributeValue(oEntryXmlNode,
"a:title/text()", oXmlNamespaceManager, oGraphMLXmlDocument,
oVertexXmlNode, TitleID);
AppendDoubleGraphMLAttributeValue(oEntryXmlNode,
"gd:rating/@average", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, RatingID);
AppendInt32GraphMLAttributeValue(oEntryXmlNode,
"yt:statistics/@viewCount", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, ViewsID);
AppendInt32GraphMLAttributeValue(oEntryXmlNode,
"yt:statistics/@favoriteCount", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, FavoritedID);
AppendInt32GraphMLAttributeValue(oEntryXmlNode,
"gd:comments/gd:feedLink/@countHint", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, CommentsID);
AppendYouTubeDateGraphMLAttributeValue(oEntryXmlNode,
"a:published/text()", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, CreatedDateUtcID);
AppendStringGraphMLAttributeValue(oEntryXmlNode,
"media:group/media:thumbnail/@url", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, ImageFileID);
if ( AppendStringGraphMLAttributeValue(oEntryXmlNode,
"media:group/media:player/@url", oXmlNamespaceManager,
oGraphMLXmlDocument, oVertexXmlNode, MenuActionID) )
{
oGraphMLXmlDocument.AppendGraphMLAttributeValue(oVertexXmlNode,
MenuTextID, "Play Video in Browser");
}
if (oTagDictionary != null)
{
CollectTags(oEntryXmlNode, sVideoID, oXmlNamespaceManager,
oTagDictionary);
}
}
}
//*************************************************************************
// Method: GetUserNetworkInternal()
//
/// <summary>
/// Gets a network of YouTube users, given a GraphMLXmlDocument.
/// </summary>
///
/// <param name="sUserNameToAnalyze">
/// The user name of the YouTube user whose network should be analyzed.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="eNetworkLevel">
/// Network level to include. Must be NetworkLevel.One, OnePointFive, or
/// Two.
/// </param>
///
/// <param name="iMaximumPeoplePerRequest">
/// Maximum number of people to request for each query, or Int32.MaxValue
/// for no limit.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// The GraphMLXmlDocument to populate with the requested network.
/// </param>
//*************************************************************************
protected void GetUserNetworkInternal(
String sUserNameToAnalyze,
WhatToInclude eWhatToInclude,
NetworkLevel eNetworkLevel,
Int32 iMaximumPeoplePerRequest,
RequestStatistics oRequestStatistics,
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert( !String.IsNullOrEmpty(sUserNameToAnalyze) );
Debug.Assert(eNetworkLevel == NetworkLevel.One ||
eNetworkLevel == NetworkLevel.OnePointFive ||
eNetworkLevel == NetworkLevel.Two);
Debug.Assert(iMaximumPeoplePerRequest > 0);
Debug.Assert(oRequestStatistics != null);
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
// The key is the user name and the value is the corresponding GraphML
// XML node that represents the user. This is used to prevent the same
// user name from being added to the XmlDocument twice.
Dictionary<String, XmlNode> oUserNameDictionary =
new Dictionary<String, XmlNode>();
// Include friends, subscriptions, both, or neither.
Boolean [] abIncludes = new Boolean[] {
WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.FriendVertices),
WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.SubscriptionVertices),
};
for (Int32 i = 0; i < 2; i++)
{
if ( abIncludes[i] )
{
GetUserNetworkRecursive(sUserNameToAnalyze, eWhatToInclude,
(i == 0), eNetworkLevel, iMaximumPeoplePerRequest, 1,
oGraphMLXmlDocument, oUserNameDictionary,
oRequestStatistics);
}
}
if ( WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.AllStatistics) )
{
AppendAllStatisticGraphMLAttributeValues(oGraphMLXmlDocument,
oUserNameDictionary, oRequestStatistics);
}
}
//*************************************************************************
// Method: GetVideoNetworkInternal()
//
/// <summary>
/// Gets a network of related YouTube videos, given a GraphMLXmlDocument.
/// </summary>
///
/// <param name="sSearchTerm">
/// The term to search for.
/// </param>
///
/// <param name="eWhatToInclude">
/// Specifies what should be included in the network.
/// </param>
///
/// <param name="iMaximumVideos">
/// Maximum number of videos to request, or Int32.MaxValue for no limit.
/// </param>
///
/// <param name="oRequestStatistics">
/// A <see cref="RequestStatistics" /> object that is keeping track of
/// requests made while getting the network.
/// </param>
///
/// <param name="oGraphMLXmlDocument">
/// The GraphMLXmlDocument to populate with the requested network.
/// </param>
//*************************************************************************
protected void GetVideoNetworkInternal(
String sSearchTerm,
WhatToInclude eWhatToInclude,
Int32 iMaximumVideos,
RequestStatistics oRequestStatistics,
GraphMLXmlDocument oGraphMLXmlDocument
)
{
Debug.Assert( !String.IsNullOrEmpty(sSearchTerm) );
Debug.Assert(iMaximumVideos > 0);
Debug.Assert(oRequestStatistics != null);
Debug.Assert(oGraphMLXmlDocument != null);
AssertValid();
// First, add a vertex for each video matching the search term.
HashSet<String> oVideoIDs;
Dictionary< String, LinkedList<String> > oTagDictionary;
AppendVertexXmlNodes(sSearchTerm, eWhatToInclude, iMaximumVideos,
oGraphMLXmlDocument, oRequestStatistics, out oVideoIDs,
out oTagDictionary);
// Now add whatever edges were requested.
if ( WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.SharedTagEdges) )
{
Debug.Assert(oTagDictionary != null);
ReportProgress("Adding edges for shared tags.");
AppendEdgesFromDictionary(oTagDictionary, oGraphMLXmlDocument,
"Shared tag");
}
oTagDictionary = null;
if ( WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.SharedCommenterEdges) )
{
AppendSharedResponderEdges(oGraphMLXmlDocument, oVideoIDs,
MaximumCommentsPerVideo,
"http://gdata.youtube.com/feeds/api/videos/{0}/comments",
"commenter", oRequestStatistics);
}
if ( WhatToIncludeFlagIsSet(eWhatToInclude,
WhatToInclude.SharedVideoResponderEdges) )
{
AppendSharedResponderEdges(oGraphMLXmlDocument, oVideoIDs,
iMaximumVideos,
"http://gdata.youtube.com/feeds/api/videos/{0}/responses",
"video responder", oRequestStatistics);
}
}
//*************************************************************************
// Method: SaveGraphCore()
//
/// <summary>
/// Saves graph data to a stream.
/// </summary>
///
/// <param name="graph">
/// Graph to save.
/// </param>
///
/// <param name="stream">
/// Stream to save the graph data to.
/// </param>
///
/// <remarks>
/// This method saves <paramref name="graph" /> to <paramref
/// name="stream" />. It does not close <paramref name="stream" />.
///
/// <para>
/// The arguments have already been checked for validity.
/// </para>
///
/// </remarks>
//*************************************************************************
protected override void SaveGraphCore(
IGraph graph,
Stream stream
)
{
Debug.Assert(graph != null);
Debug.Assert(stream != null);
AssertValid();
GraphMLXmlDocument oGraphMLXmlDocument = new GraphMLXmlDocument(
graph.Directedness == GraphDirectedness.Directed);
String [] asEdgeAttributeNames = ( String[] )graph.GetRequiredValue(
ReservedMetadataKeys.AllEdgeMetadataKeys, typeof( String[] ) );
String [] asVertexAttributeNames = ( String[] )graph.GetRequiredValue(
ReservedMetadataKeys.AllVertexMetadataKeys, typeof( String[] ) );
// Define the Graph-ML attributes.
const String VertexAttributeIDPrefix = "V-";
const String EdgeAttributeIDPrefix = "E-";
foreach (String sVertexAttributeName in asVertexAttributeNames)
{
oGraphMLXmlDocument.DefineGraphMLAttribute(false,
VertexAttributeIDPrefix + sVertexAttributeName,
sVertexAttributeName, "string", null);
}
foreach (String sEdgeAttributeName in asEdgeAttributeNames)
{
oGraphMLXmlDocument.DefineGraphMLAttribute(true,
EdgeAttributeIDPrefix + sEdgeAttributeName,
sEdgeAttributeName, "string", null);
}
// Add the vertices and their Graph-ML attribute values.
foreach (IVertex oVertex in graph.Vertices)
{
XmlNode oVertexXmlNode = oGraphMLXmlDocument.AppendVertexXmlNode(
oVertex.Name);
AppendGraphMLAttributeValues(oVertex, oGraphMLXmlDocument,
oVertexXmlNode, asVertexAttributeNames,
VertexAttributeIDPrefix);
}
// Add the edges and their Graph-ML attribute values.
foreach (IEdge oEdge in graph.Edges)
{
IVertex [] oVertices = oEdge.Vertices;
XmlNode oEdgeXmlNode = oGraphMLXmlDocument.AppendEdgeXmlNode(
oVertices[0].Name, oVertices[1].Name);
AppendGraphMLAttributeValues(oEdge, oGraphMLXmlDocument,
oEdgeXmlNode, asEdgeAttributeNames, EdgeAttributeIDPrefix);
}
oGraphMLXmlDocument.Save(stream);
}