public override bool TryGetDelegationMetadata(CallNode node, TexlBinding binding, out IDelegationMetadata metadata)
{
Contracts.AssertValue(node);
Contracts.AssertValue(binding);
metadata = null;
// Get metadata if it's an entity.
IExpandInfo entityInfo;
if (binding.TryGetEntityInfo(node.Args.Children[0], out entityInfo))
{
Contracts.AssertValue(entityInfo.ParentDataSource);
Contracts.AssertValue(entityInfo.ParentDataSource.DataEntityMetadataProvider);
var metadataProvider = entityInfo.ParentDataSource.DataEntityMetadataProvider;
IDataEntityMetadata entityMetadata;
if (!metadataProvider.TryGetEntityMetadata(entityInfo.Identity, out entityMetadata))
{
return(false);
}
metadata = entityMetadata.DelegationMetadata.VerifyValue();
return(true);
}
if (!TryGetValidDataSourceForDelegation(node, binding, FunctionDelegationCapability, out var ds))
{
return(false);
}
metadata = ds.DelegationMetadata;
return(true);
}
private bool TryGetEntityInfo(DottedNameNode dottedNameNode, TexlBinding binding, out IExpandInfo entityInfo)
{
Contracts.AssertValueOrNull(dottedNameNode);
Contracts.AssertValue(binding);
entityInfo = null;
if (dottedNameNode == null || !binding.HasExpandInfo(dottedNameNode))
{
return(false);
}
return(binding.TryGetEntityInfo(dottedNameNode, out entityInfo));
}
private bool TryGetEntityInfo(FirstNameNode firstName, TexlBinding binding, out IExpandInfo entityInfo)
{
Contracts.AssertValueOrNull(firstName);
Contracts.AssertValue(binding);
entityInfo = null;
if (firstName == null || !binding.GetType(firstName).IsTable)
{
return(false);
}
return(binding.TryGetEntityInfo(firstName, out entityInfo));
}
private bool TryGetDsInfo(DottedNameNode dottedNameNode, TexlBinding binding, out IExternalDataSource dsInfo)
{
Contracts.AssertValueOrNull(dottedNameNode);
Contracts.AssertValue(binding);
dsInfo = null;
if (dottedNameNode == null || !binding.HasExpandInfo(dottedNameNode))
{
return(false);
}
IExpandInfo info;
binding.TryGetEntityInfo(dottedNameNode, out info).Verify();
dsInfo = info.ParentDataSource;
return(true);
}