/// <summary>
/// Add a vertex to a graph only if no other vertex in the provided Index is indexed by the property key/value pair.
/// If a vertex already exists with that key/value pair, return the pre-existing vertex.
/// </summary>
/// <param name="graph">the graph to add the vertex to</param>
/// <param name="id">the id of the vertex to create (can be null)</param>
/// <param name="index">the index to determine if another vertex with the same key/value exists</param>
/// <param name="uniqueKey">the key to check on for uniqueness of the vertex</param>
/// <param name="uniqueValue">the value to check on for uniqueness of the vertex</param>
/// <returns>the newly created vertex or the vertex that satisfies the uniqueness criteria</returns>
public static IVertex AddUniqueVertex(this IIndexableGraph graph, object id, IIndex index, string uniqueKey,
object uniqueValue)
{
if (graph == null)
{
throw new ArgumentNullException(nameof(graph));
}
if (index == null)
{
throw new ArgumentNullException(nameof(index));
}
if (string.IsNullOrWhiteSpace(uniqueKey))
{
throw new ArgumentNullException(nameof(uniqueKey));
}
var result = (IVertex)index.Get(uniqueKey, uniqueValue).FirstOrDefault();
if (result == null)
{
result = graph.AddVertex(id);
result.SetProperty(uniqueKey, uniqueValue);
}
return(result);
}
public PartitionIndexableGraph(IIndexableGraph baseIndexableGraph, string writeGraphKey, string readWriteGraph)
: base(baseIndexableGraph, writeGraphKey, readWriteGraph)
{
if (baseIndexableGraph == null)
{
throw new ArgumentNullException(nameof(baseIndexableGraph));
}
}
public WrappedIndexableGraph(IIndexableGraph baseIndexableGraph)
: base(baseIndexableGraph)
{
if (baseIndexableGraph == null)
{
throw new ArgumentNullException(nameof(baseIndexableGraph));
}
_baseIndexableGraph = baseIndexableGraph;
}
public EventTransactionalIndexableGraph(IIndexableGraph baseIndexableGraph)
: base(baseIndexableGraph)
{
if (!(baseIndexableGraph is ITransactionalGraph))
{
throw new ArgumentException("baseIndexableGraph must be of type ITransactionalGraph");
}
TransactionalGraph = baseIndexableGraph as ITransactionalGraph;
Trigger = new EventTrigger(this, true);
}
public PartitionIndexableGraph(IIndexableGraph baseIndexableGraph, string writeGraphKey, string writeGraph,
IEnumerable <string> readGraphs)
: base(baseIndexableGraph, writeGraphKey, writeGraph, readGraphs)
{
if (baseIndexableGraph == null)
{
throw new ArgumentNullException(nameof(baseIndexableGraph));
}
if (readGraphs == null)
{
throw new ArgumentNullException(nameof(readGraphs));
}
BaseIndexableGraph = baseIndexableGraph;
}