/// <summary> Gets the list of records from an OAI-PMH repository </summary>
/// <param name="OAI_URL"> URL for the OAI-PMH repository </param>
/// <param name="Set"> Name of the OAI-PMH set to pull records from </param>
/// <param name="MetadataPrefix"> Metadata type to request </param>
/// <returns> List of the records, or NULL if an error occrured </returns>
public static OAI_Repository_Records_List List_Records(string OAI_URL, string Set, string MetadataPrefix)
{
try
{
// Create the return value
OAI_Repository_Records_List returnValue = new OAI_Repository_Records_List();
// Get the URL
string url = OAI_URL + "?verb=ListRecords&set=" + Set + "&metadataPrefix=" + MetadataPrefix;
if (Set.Length == 0)
{
url = OAI_URL + "?verb=ListRecords&metadataPrefix=" + MetadataPrefix;
}
// prepare the web page we will be asking for
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
// execute the request
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
// we will read data via the response stream
Stream resStream = response.GetResponseStream();
// Read the stream and output the list of records
read_list_of_records(resStream, returnValue);
return(returnValue);
}
catch
{
return(null);
}
}
/// <summary> Gets the continuing list of records from an OAI-PMH repository, from a resumption token </summary>
/// <param name="OAI_URL">URL for the OAI repository</param>
/// <param name="Resumption_Token"> Recent resumption token from that repository </param>
/// <returns> List of all the records from the repository </returns>
public static OAI_Repository_Records_List List_Records(string OAI_URL, string Resumption_Token)
{
try
{
// Create the return value
OAI_Repository_Records_List returnValue = new OAI_Repository_Records_List();
// Get the URL
string url = OAI_URL + "?verb=ListRecords&resumptionToken=" + Resumption_Token;
// prepare the web page we will be asking for
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
// execute the request
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
// we will read data via the response stream
Stream resStream = response.GetResponseStream();
// Read the stream and output the list of records
read_list_of_records(resStream, returnValue);
return(returnValue);
}
catch (Exception ee)
{
Debug.WriteLine(ee.Message);
return(null);
}
}
private static void read_list_of_records(Stream ResStream, OAI_Repository_Records_List ReturnValue)
{
// Try to read the XML
XmlTextReader r = new XmlTextReader(ResStream);
bool inRecord = false;
OAI_Repository_DublinCore_Record thisRecord = new OAI_Repository_DublinCore_Record();
while (r.Read())
{
if (inRecord)
{
if (r.NodeType == XmlNodeType.Element)
{
switch (r.Name)
{
case "identifier":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.OAI_Identifier = r.Value.Trim();
}
break;
case "datestamp":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Datestamp = r.Value.Trim();
}
break;
case "dc:title":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Title(r.Value.Trim());
}
break;
case "dc:creator":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Creator(r.Value.Trim());
}
break;
case "dc:subject":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Subject(r.Value.Trim());
}
break;
case "dc:description":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Description(r.Value.Trim());
}
break;
case "dc:publisher":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Publisher(r.Value.Trim());
}
break;
case "dc:contributor":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Contributor(r.Value.Trim());
}
break;
case "dc:date":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Date(r.Value.Trim());
}
break;
case "dc:type":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Type(r.Value.Trim());
}
break;
case "dc:format":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Format(r.Value.Trim());
}
break;
case "dc:source":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Source(r.Value.Trim());
}
break;
case "dc:identifier":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Identifier(r.Value.Trim());
}
break;
case "dc:language":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Language(r.Value.Trim());
}
break;
case "dc:relation":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Relation(r.Value.Trim());
}
break;
case "dc:coverage":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Coverage(r.Value.Trim());
}
break;
case "dc:rights":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Rights(r.Value.Trim());
}
break;
}
}
else if ((r.NodeType == XmlNodeType.EndElement) && (r.Name == "record"))
{
inRecord = false;
ReturnValue.Add_Record(thisRecord);
}
}
else
{
if ((r.NodeType == XmlNodeType.Element) && (r.Name == "record"))
{
inRecord = true;
thisRecord = new OAI_Repository_DublinCore_Record();
}
if ((r.NodeType == XmlNodeType.Element) && (r.Name == "resumptionToken"))
{
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
ReturnValue.Resumption_Token = r.Value;
}
break;
}
}
}
}
private static void read_list_of_records(Stream ResStream, OAI_Repository_Records_List ReturnValue)
{
// Try to read the XML
XmlTextReader r = new XmlTextReader(ResStream);
bool inRecord = false;
OAI_Repository_DublinCore_Record thisRecord = new OAI_Repository_DublinCore_Record();
while (r.Read())
{
if (inRecord)
{
if (r.NodeType == XmlNodeType.Element)
{
switch (r.Name)
{
case "identifier":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.OAI_Identifier = r.Value.Trim();
}
break;
case "datestamp":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Datestamp = r.Value.Trim();
}
break;
case "dc:title":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Title(r.Value.Trim());
}
break;
case "dc:creator":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Creator(r.Value.Trim());
}
break;
case "dc:subject":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Subject(r.Value.Trim());
}
break;
case "dc:description":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Description(r.Value.Trim());
}
break;
case "dc:publisher":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Publisher(r.Value.Trim());
}
break;
case "dc:contributor":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Contributor(r.Value.Trim());
}
break;
case "dc:date":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Date(r.Value.Trim());
}
break;
case "dc:type":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Type(r.Value.Trim());
}
break;
case "dc:format":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Format(r.Value.Trim());
}
break;
case "dc:source":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Source(r.Value.Trim());
}
break;
case "dc:identifier":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Identifier(r.Value.Trim());
}
break;
case "dc:language":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Language(r.Value.Trim());
}
break;
case "dc:relation":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Relation(r.Value.Trim());
}
break;
case "dc:coverage":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Coverage(r.Value.Trim());
}
break;
case "dc:rights":
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
thisRecord.Add_Rights(r.Value.Trim());
}
break;
}
}
else if ((r.NodeType == XmlNodeType.EndElement) && (r.Name == "record"))
{
inRecord = false;
ReturnValue.Add_Record(thisRecord);
}
}
else
{
if ((r.NodeType == XmlNodeType.Element) && (r.Name == "record"))
{
inRecord = true;
thisRecord = new OAI_Repository_DublinCore_Record();
}
if ((r.NodeType == XmlNodeType.Element) && (r.Name == "resumptionToken"))
{
r.Read();
if ((r.NodeType == XmlNodeType.Text) && (r.Value.Trim().Length > 0))
{
ReturnValue.Resumption_Token = r.Value;
}
break;
}
}
}
}
/// <summary> Gets the list of records from an OAI-PMH repository </summary>
/// <param name="OAI_URL"> URL for the OAI-PMH repository </param>
/// <param name="Set"> Name of the OAI-PMH set to pull records from </param>
/// <param name="MetadataPrefix"> Metadata type to request </param>
/// <returns> List of the records, or NULL if an error occrured </returns>
public static OAI_Repository_Records_List List_Records(string OAI_URL, string Set, string MetadataPrefix)
{
try
{
// Create the return value
OAI_Repository_Records_List returnValue = new OAI_Repository_Records_List();
// Get the URL
string url = OAI_URL + "?verb=ListRecords&set=" + Set + "&metadataPrefix=" + MetadataPrefix;
if (Set.Length == 0)
url = OAI_URL + "?verb=ListRecords&metadataPrefix=" + MetadataPrefix;
// prepare the web page we will be asking for
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
// execute the request
HttpWebResponse response = (HttpWebResponse) request.GetResponse();
// we will read data via the response stream
Stream resStream = response.GetResponseStream();
// Read the stream and output the list of records
read_list_of_records(resStream, returnValue);
return returnValue;
}
catch
{
return null;
}
}
/// <summary> Gets the continuing list of records from an OAI-PMH repository, from a resumption token </summary>
/// <param name="OAI_URL">URL for the OAI repository</param>
/// <param name="Resumption_Token"> Recent resumption token from that repository </param>
/// <returns> List of all the records from the repository </returns>
public static OAI_Repository_Records_List List_Records(string OAI_URL, string Resumption_Token)
{
try
{
// Create the return value
OAI_Repository_Records_List returnValue = new OAI_Repository_Records_List();
// Get the URL
string url = OAI_URL + "?verb=ListRecords&resumptionToken=" + Resumption_Token;
// prepare the web page we will be asking for
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
// execute the request
HttpWebResponse response = (HttpWebResponse) request.GetResponse();
// we will read data via the response stream
Stream resStream = response.GetResponseStream();
// Read the stream and output the list of records
read_list_of_records(resStream, returnValue);
return returnValue;
}
catch (Exception ee)
{
Debug.WriteLine(ee.Message);
return null;
}
}
