|
abstract public GetPropertyValue ( |
||
| elementId | Id of a Vertex/Edge | |
| return | IComparable | |
/// <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>
/// Enumerates all the values for the given vertex/edge property
/// </summary>
/// <param name="property">Edge or Vertex property</param>
/// <returns>Enumeration of property values</returns>
public IEnumerable <IComparable> GetValues(PropertyType property)
{
if (property.IsVertexProperty)
{
foreach (VertexType vt in vertexType)
{
foreach (Vertex vertex in vt.GetVertices())
{
IComparable v = property.GetPropertyValue(vertex.VertexId);
if (v != null)
{
yield return(v);
}
}
}
}
else
{
foreach (EdgeType et in edgeType)
{
foreach (Edge edge in et.GetEdges())
{
IComparable v = property.GetPropertyValue(edge.EdgeId);
if (v != null)
{
yield return(v);
}
}
}
}
}
/// <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);
}
/// <summary>
/// Gets a property value given an edge id and a property type
/// </summary>
/// <param name="elementId">an edge id</param>
/// <param name="property">a property type</param>
/// <returns>a property value</returns>
public IComparable GetPropertyValue(ElementId elementId, PropertyType property)
{
return(property.GetPropertyValue(elementId));
}
/// <summary>
/// Get the property value for a <see cref="Vertex"/>
/// </summary>
/// <param name="vertexId">Id of <see cref="Vertex"/></param>
/// <param name="propertyType">Type of property</param>
/// <returns></returns>
public object GetPropertyValue(VertexId vertexId, PropertyType propertyType)
{
return propertyType.GetPropertyValue(vertexId);
}
