/// <summary>
/// numerates all elements satisfying the given condition for the given property and value range
/// </summary>
/// <param name="property">Property we are looking for</param>
/// <param name="condition"> filter function, applied with in graph value as 1st parameter, lower as 2nd and higher as 3rd parameter.</param>
/// <param name="lower">lower value in filtering</param>
/// <param name="higher">higher value in filtering</param>
/// <returns></returns>
public IEnumerable <IElement> Select(PropertyType property, Func <IComparable, IComparable, IComparable, Boolean> condition, IComparable lower, IComparable higher)
{
if (property.IsVertexProperty)
{
VertexType vt = vertexType[property.TypeId];
foreach (Vertex vertex in vt.GetVertices())
{
IComparable v = property.GetPropertyValue(vertex.VertexId);
if (condition(v, lower, higher))
{
yield return(vertex);
}
}
}
else
{
EdgeType et = edgeType[property.TypeId];
foreach (Edge edge in et.GetEdges())
{
IComparable v = property.GetPropertyValue(edge.EdgeId);
if (condition(v, lower, higher))
{
yield return(edge);
}
}
}
}
/// <summary>
/// Removes a property type except if any vertex or edge is using it
/// </summary>
/// <param name="pt">property type to remove</param>
public void RemovePropertyType(PropertyType pt)
{
if (pt.IsVertexProperty)
{
VertexType vt = vertexType[pt.TypeId];
foreach (Vertex vertex in vt.GetVertices())
{
IComparable v = pt.GetPropertyValue(vertex.VertexId);
if (v != null)
{
throw new PropertyTypeInUseException();
}
}
}
else
{
EdgeType et = edgeType[pt.TypeId];
foreach (Edge edge in et.GetEdges())
{
IComparable v = pt.GetPropertyValue(edge.EdgeId);
if (v != null)
{
throw new PropertyTypeInUseException();
}
}
}
if (pt.IsVertexProperty)
{
VertexType vt = vertexType[pt.TypeId];
vt.stringToPropertyType.Remove(pt.Name);
}
else
{
EdgeType et = edgeType[pt.TypeId];
et.stringToPropertyType.Remove(pt.Name);
}
Update();
propertyType[pt.PropertyId] = null;
pt.Unpersist(Session, true);
}