/// <summary>
/// Determines the index of the specific item in the list using the
/// unique thing identifier.
/// </summary>
///
/// <param name="key">
/// The unique thing key used to locate the
/// item in the list.
/// </param>
///
/// <returns>
/// The index of item, if found in the list; otherwise, -1.
/// </returns>
///
public int IndexOf(ThingKey key)
{
lock (_abstractResults)
{
int result = -1;
for (int index = 0; index < _abstractResults.Count; ++index)
{
ThingKey abstractThingKey;
IThing thing = _abstractResults[index] as IThing;
if (thing != null)
{
abstractThingKey = thing.Key;
}
else
{
abstractThingKey = (ThingKey)_abstractResults[index];
}
if (abstractThingKey.Equals(key))
{
result = index;
break;
}
}
return(result);
}
}
internal void ParseXml(XPathNavigator relationshipNav)
{
XPathNavigator thingIdNav = relationshipNav.SelectSingleNode("thing-id");
if (thingIdNav != null)
{
Guid itemId = new Guid(thingIdNav.Value);
XPathNavigator versionStampNav = relationshipNav.SelectSingleNode("version-stamp");
if (versionStampNav != null)
{
Guid versionStamp = new Guid(versionStampNav.Value);
ItemKey = new ThingKey(itemId, versionStamp);
}
else
{
ItemKey = new ThingKey(itemId);
}
}
else
{
XPathNavigator clientIdNav = relationshipNav.SelectSingleNode("client-thing-id");
if (clientIdNav != null)
{
ClientId = clientIdNav.Value;
}
}
RelationshipType = XPathHelper.GetOptNavValue(relationshipNav, "relationship-type");
}
/// <summary>
/// Gets a value indicating whether the collection contains a
/// <see cref="IThing"/> with the specified
/// <see cref="ThingKey"/>.
/// </summary>
///
/// <param name="itemKey">
/// The unique <see cref="ThingKey"/> used to locate the
/// <see cref="ThingBase"/>item in the collection. The key
/// contains a unique identifier for the <see cref="ThingBase"/>
/// and a unique version stamp identifying the version of
/// the <see cref="IThing"/>.
/// </param>
///
/// <returns>
/// <b>true</b> if a matching object is found; otherwise, <b>false</b>.
/// </returns>
///
public bool Contains(ThingKey itemKey)
{
lock (_abstractResults)
{
bool result = false;
for (int index = 0; index < _abstractResults.Count; ++index)
{
ThingKey abstractThingKey;
IThing thing
= _abstractResults[index] as IThing;
if (thing != null)
{
abstractThingKey = thing.Key;
}
else
{
abstractThingKey
= (ThingKey)_abstractResults[index];
}
if (abstractThingKey.Equals(itemKey))
{
result = true;
break;
}
}
return(result);
}
}
/// <summary>
/// Constructs a <see cref="ThingRelationship" /> instance for a relationship
/// to the item with the specified ID.
/// </summary>
///
/// <param name="itemId">
/// The unique identifier of the thing to related to.
/// </param>
///
/// <exception cref="ArgumentException">
/// If <paramref name="itemId"/> is <see cref="System.Guid.Empty"/>.
/// </exception>
///
public ThingRelationship(Guid itemId)
{
if (itemId == Guid.Empty)
{
throw new ArgumentException(Resources.RelationshipItemIDNotSpecified, nameof(itemId));
}
ItemKey = new ThingKey(itemId);
}
/// <summary>
/// Compares one <see cref="ThingKey"/> to another.
/// </summary>
///
/// <param name="obj">
/// The <see cref="ThingKey"/> to compare against this.
/// </param>
///
/// <returns>
/// <b>true</b> if both the thing keys have
/// the same ID and version stamp; otherwise, <b>false</b>.
/// </returns>
///
public override bool Equals(object obj)
{
bool result = false;
ThingKey rVal = obj as ThingKey;
if (rVal != null)
{
result = (_versionStamp == rVal.VersionStamp) &&
(_thingId == rVal.Id);
}
return(result);
}
/// <summary>
/// Constructs a <see cref="ThingRelationship" /> instance for a relationship
/// to the item with the specified key.
/// </summary>
///
/// <param name="itemKey">
/// The unique key of the thing to related to, including the item ID and
/// optionally the item version stamp.
/// </param>
///
/// <exception cref="ArgumentNullException">
/// If <paramref name="itemKey"/> is <b>null</b>.
/// </exception>
///
public ThingRelationship(ThingKey itemKey)
{
Validator.ThrowIfArgumentNull(itemKey, nameof(itemKey), Resources.RelationshipItemKeyNotSpecified);
ItemKey = itemKey;
}
/// <summary>
/// Constructs a <see cref="ThingRelationship" /> instance for a relationship
/// to the item with the specified key and relationship type.
/// </summary>
///
/// <param name="itemKey">
/// The unique key of the thing to related to, including the item ID and
/// optionally the item version stamp.
/// </param>
///
/// <param name="relationshipType">
/// The application defined type for the relationship. This is usually a descriptive tagging
/// for the relationship. For example, a Annotation item may have a
/// "annotation" relationship with a Problem item.
/// </param>
///
/// <exception cref="ArgumentNullException">
/// If <paramref name="itemKey"/> is <b>null</b>.
/// </exception>
///
public ThingRelationship(ThingKey itemKey, string relationshipType)
: this(itemKey)
{
RelationshipType = relationshipType;
}
internal void AddResult(ThingKey thingKey)
{
_abstractResults.Add(thingKey);
}
private async Task GetPartialThingsAsync(int index)
{
// We must have a partial thing at this index. Get
// the next MaxResultsPerRequest number of partial
// items.
List <ThingKey> partialThings = new List <ThingKey>();
for (
int partialThingIndex = index;
(partialThings.Count < MaxResultsPerRequest || MaxResultsPerRequest == int.MinValue) && partialThingIndex < _abstractResults.Count;
++partialThingIndex)
{
var key = _abstractResults[partialThingIndex] as ThingKey;
if (key != null)
{
partialThings.Add(
key);
}
else
{
// We break if we hit something that is
// not a Guid (like ThingBase). This means
// that we will retrieve fewer things than
// MaxResultsPerRequest but it will be simpler
// to replace the partial things with the real
// things.
break;
}
}
ThingCollection things = await GetPartialThingsAsync(partialThings).ConfigureAwait(false);
bool atEndOfPartialThings = false;
int newThingIndex = index;
foreach (IThing thing in things)
{
// We need to start at the current index but look until
// we find a matching thing ID. It is possible that the
// thing may have been removed while holding on to the
// partial thing ID from the original query.
for (; newThingIndex < _abstractResults.Count; ++newThingIndex)
{
ThingKey abstractResultKey =
_abstractResults[newThingIndex] as ThingKey;
if (abstractResultKey != null)
{
if (abstractResultKey.Equals(thing.Key))
{
// replace the partial thing with the real
// thing
_abstractResults[newThingIndex++] = thing;
break;
}
}
else
{
atEndOfPartialThings = true;
break;
}
}
if (atEndOfPartialThings)
{
break;
}
}
}
