public bool Extract(Expression tree, IQueryable <DSResource> resourceRoot, ResourceType resourceType, EntityMetadata entityMetadata)
{
this.resourceRoot = resourceRoot;
this.entityMetadata = entityMetadata;
this.navigationProperty = null;
this.referredEntityKeys = new Dictionary <string, object>();
this.referringEntityKeys = new Dictionary <string, object>();
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractingReferredEntityInfo;
this.Visit(tree);
if (this.currentState == ReferredResourceExtractor.ExtractionState.ExtractingReferringEntityInfo)
{
DSResource dSResource = ResourceTypeExtensions.CreateKeyOnlyResource(resourceType, this.referringEntityKeys);
if (dSResource != null)
{
this.ReferredResource = ResourceTypeExtensions.CreateKeyOnlyResource(this.navigationProperty.ResourceType, this.referredEntityKeys);
if (this.ReferredResource != null)
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionDone;
}
}
}
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractionDone)
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
}
return(this.currentState == ReferredResourceExtractor.ExtractionState.ExtractionDone);
}
public bool Extract(Expression tree, IQueryable<DSResource> resourceRoot, ResourceType resourceType, EntityMetadata entityMetadata)
{
this.resourceRoot = resourceRoot;
this.entityMetadata = entityMetadata;
this.navigationProperty = null;
this.referredEntityKeys = new Dictionary<string, object>();
this.referringEntityKeys = new Dictionary<string, object>();
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractingReferredEntityInfo;
this.Visit(tree);
if (this.currentState == ReferredResourceExtractor.ExtractionState.ExtractingReferringEntityInfo)
{
DSResource dSResource = ResourceTypeExtensions.CreateKeyOnlyResource(resourceType, this.referringEntityKeys);
if (dSResource != null)
{
this.ReferredResource = ResourceTypeExtensions.CreateKeyOnlyResource(this.navigationProperty.ResourceType, this.referredEntityKeys);
if (this.ReferredResource != null)
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionDone;
}
}
}
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractionDone)
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
}
return this.currentState == ReferredResourceExtractor.ExtractionState.ExtractionDone;
}
protected override Expression VisitMethodCall(MethodCallExpression expression)
{
ResourceProperty resourceProperty = null;
object obj = null;
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractionFailed)
{
if (expression.Method.Name != "Where")
{
if (expression.Method.Name != "SelectMany")
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
}
else
{
if (this.currentState == ReferredResourceExtractor.ExtractionState.ExtractingReferredEntityInfo)
{
this.navigationProperty = ExpressionHelper.GetResourcePropertyFromSequence(expression.Arguments[1]);
if (!this.navigationProperty.IsReferenceSetProperty())
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
}
else
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractingReferringEntityInfo;
}
}
else
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
return(expression);
}
}
}
else
{
if (ExpressionHelper.IsResourceRoot(expression.Arguments[0], this.resourceRoot) || ExpressionHelper.IsNestedWhereClause(expression.Arguments[0], this.resourceRoot))
{
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractingReferringEntityInfo || this.navigationProperty == null)
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
return(expression);
}
}
else
{
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractingReferredEntityInfo || this.navigationProperty != null)
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
return(expression);
}
}
if (ExpressionHelper.GetResourcePropertyAndValueFromLambda(expression.Arguments[1], out resourceProperty, out obj))
{
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractingReferringEntityInfo)
{
this.referredEntityKeys.Add(resourceProperty.Name, obj);
}
else
{
this.referringEntityKeys.Add(resourceProperty.Name, obj);
}
}
else
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
return(expression);
}
}
this.Visit(expression.Arguments[0]);
return(expression);
}
else
{
return(expression);
}
}
protected override Expression VisitMethodCall(MethodCallExpression expression)
{
ResourceProperty resourceProperty = null;
object obj = null;
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractionFailed)
{
if (expression.Method.Name != "Where")
{
if (expression.Method.Name != "SelectMany")
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
}
else
{
if (this.currentState == ReferredResourceExtractor.ExtractionState.ExtractingReferredEntityInfo)
{
this.navigationProperty = ExpressionHelper.GetResourcePropertyFromSequence(expression.Arguments[1]);
if (!this.navigationProperty.IsReferenceSetProperty())
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
}
else
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractingReferringEntityInfo;
}
}
else
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
return expression;
}
}
}
else
{
if (ExpressionHelper.IsResourceRoot(expression.Arguments[0], this.resourceRoot) || ExpressionHelper.IsNestedWhereClause(expression.Arguments[0], this.resourceRoot))
{
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractingReferringEntityInfo || this.navigationProperty == null)
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
return expression;
}
}
else
{
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractingReferredEntityInfo || this.navigationProperty != null)
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
return expression;
}
}
if (ExpressionHelper.GetResourcePropertyAndValueFromLambda(expression.Arguments[1], out resourceProperty, out obj))
{
if (this.currentState != ReferredResourceExtractor.ExtractionState.ExtractingReferringEntityInfo)
{
this.referredEntityKeys.Add(resourceProperty.Name, obj);
}
else
{
this.referringEntityKeys.Add(resourceProperty.Name, obj);
}
}
else
{
this.currentState = ReferredResourceExtractor.ExtractionState.ExtractionFailed;
return expression;
}
}
this.Visit(expression.Arguments[0]);
return expression;
}
else
{
return expression;
}
}
