public QueryCompositionOperationInvoker(IOperationInvoker invoker, IQueryComposer queryComposer)
{
this.inner = invoker;
this.composer = queryComposer;
}
public QueryCompositionOperationInvoker(IOperationInvoker invoker, IQueryComposer queryComposer)
{
this.inner = invoker;
this.composer = queryComposer;
}
private void AddQueryComposer(DispatchOperation dispatchOperation, OperationDescription operationDescription, bool isAttributeSetOnOperation)
{
// QueryComposer is added for 2-way operations when the returnType is IEnumerable, IEnumerable<>, IQueryable or IQueryable<>
// if enabled and the user did not specify the queryComposerType, add the UrlQueryComposerType
if (dispatchOperation.IsOneWay)
{
if (isAttributeSetOnOperation && this.enabled)
{
// throw if the QueryCompositionAttribute was set on the Operation
throw new InvalidOperationException(String.Format(
CultureInfo.InvariantCulture,
"QueryComposition attribute was set on one-way operation {0}. Please remove this attribute from this operation.",
dispatchOperation.Name));
}
return;
}
else
{
// Verify if the returnType type is IEnumerable, IEnumerable<>, IQueryable or IQueryable<>
bool isQueryCompositionSupportedOnReturnType = false;
Type returnType = null;
if (operationDescription.Messages[1] != null && operationDescription.Messages[1].Body != null && operationDescription.Messages[1].Body.ReturnValue != null)
{
returnType = operationDescription.Messages[1].Body.ReturnValue.Type;
if (returnType != null)
{
if (returnType == EnumerableType)
{
isQueryCompositionSupportedOnReturnType = true;
}
else if (returnType.IsGenericType)
{
Type genericTypeDefinition = returnType.GetGenericTypeDefinition();
if (genericTypeDefinition == GenericEnumerableType)
{
isQueryCompositionSupportedOnReturnType = true;
} //FIX: GB - IQueryable
else if (genericTypeDefinition == GenericQueryableType)
{
isQueryCompositionSupportedOnReturnType = true;
}
}
}
}
// if the returnType is not IEnumerable, IEnumerable<>, we don't set the QueryComposer
if (!isQueryCompositionSupportedOnReturnType)
{
// throw if the QueryCompositionAttribute was set on the Operation
if (isAttributeSetOnOperation && this.enabled)
{
throw new InvalidOperationException(
String.Format(
CultureInfo.InvariantCulture,
"QueryComposition attribute was set on operation {0}, but the return type is not defined as IEnumerable. Please remove this attribute from this operation or change the operation return type to IEnumerable",
dispatchOperation.Name));
}
return;
}
if (this.enabled)
{
IQueryComposer queryComposer = null;
if (this.queryComposerType == null)
{
queryComposer = new UrlQueryComposer();
}
else
{
queryComposer = (IQueryComposer)Activator.CreateInstance(this.queryComposerType);
}
dispatchOperation.Invoker = new QueryCompositionOperationInvoker(dispatchOperation.Invoker, queryComposer);
}
}
}
