/// <summary>
/// Copy constructor
/// </summary>
/// <param name="field"></param>
public ValueField(ValueField field) : base(field.FieldAlias)
{
Copy(field);
}
/// <summary>
/// This function bind the data source to a given graph definitions
/// </summary>
/// <param name="graphDefinition"></param>
public void Bind(IGraphSchemaProvider graphDefinition)
{
// During binding, we read graph definition of the entity
// and populate the EntityField object in the output
// with the list of fields that the node/edge definition can expose
var properties = new List <ValueField>();
string entityUniqueName;
string sourceEntityName = null;
string sinkEntityName = null;
ValueField nodeIdField = null;
ValueField edgeSrcIdField = null;
ValueField edgeSinkIdField = null;
try
{
if (Entity is NodeEntity)
{
NodeSchema nodeDef = graphDefinition.GetNodeDefinition(Entity.EntityName);
entityUniqueName = nodeDef.Id;
nodeIdField = new ValueField(nodeDef.NodeIdProperty.PropertyName, nodeDef.NodeIdProperty.DataType);
properties.AddRange(nodeDef.Properties.Select(p => new ValueField(p.PropertyName, p.DataType)));
properties.Add(nodeIdField);
}
else
{
var edgeEnt = Entity as RelationshipEntity;
EdgeSchema edgeDef = null;
switch (edgeEnt.RelationshipDirection)
{
case RelationshipEntity.Direction.Forward:
edgeDef = graphDefinition.GetEdgeDefinition(edgeEnt.EntityName, edgeEnt.LeftEntityName, edgeEnt.RightEntityName);
break;
case RelationshipEntity.Direction.Backward:
edgeDef = graphDefinition.GetEdgeDefinition(edgeEnt.EntityName, edgeEnt.RightEntityName, edgeEnt.LeftEntityName);
break;
default:
// either direction
// TODO: we don't handle 'both' direction yet
Debug.Assert(edgeEnt.RelationshipDirection == RelationshipEntity.Direction.Both);
edgeDef = graphDefinition.GetEdgeDefinition(edgeEnt.EntityName, edgeEnt.LeftEntityName, edgeEnt.RightEntityName);
if (edgeDef == null)
{
edgeDef = graphDefinition.GetEdgeDefinition(edgeEnt.EntityName, edgeEnt.RightEntityName, edgeEnt.LeftEntityName);
}
break;
}
entityUniqueName = edgeDef.Id;
sourceEntityName = edgeDef.SourceNodeId;
sinkEntityName = edgeDef.SinkNodeId;
edgeSrcIdField = new ValueField(edgeDef.SourceIdProperty.PropertyName, edgeDef.SourceIdProperty.DataType);
edgeSinkIdField = new ValueField(edgeDef.SinkIdProperty.PropertyName, edgeDef.SinkIdProperty.DataType);
properties.AddRange(edgeDef.Properties.Select(p => new ValueField(p.PropertyName, p.DataType)));
properties.Add(edgeSrcIdField);
properties.Add(edgeSinkIdField);
}
}
catch (KeyNotFoundException e)
{
throw new TranspilerBindingException($"Failed to binding entity with alias '{Entity.Alias}' of type '{Entity.EntityName}' to graph definition. Inner error: {e.GetType().Name}: {e.Message}");
}
Debug.Assert(OutputSchema.Count == 1 &&
OutputSchema.First() is EntityField &&
(OutputSchema.First() as EntityField).EntityName == Entity.EntityName);
var field = OutputSchema.First() as EntityField;
field.BoundEntityName = entityUniqueName;
field.BoundSourceEntityName = sourceEntityName;
field.BoundSinkEntityName = sinkEntityName;
field.EncapsulatedFields = properties;
field.NodeJoinField = nodeIdField;
field.RelSourceJoinField = edgeSrcIdField;
field.RelSinkJoinField = edgeSinkIdField;
}