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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.analysis;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nullable;
/**
* A provider that wraps a transitive info provider map.
*
* <p>Useful for wrapping providers in aspects in a general way where there would otherwise be a
* conflict.
*/
public interface WrappingProvider extends TransitiveInfoProvider {
TransitiveInfoProviderMap getTransitiveInfoProviderMap();
/**
* Helper methods for {@link WrappingProvider}.
*
* <p>This class can be removed once Java 8 is supported and we can put static methods on
* interfaces.
*/
class Helper {
/** Gets the actual providers from a list of wrappers. */
public static <T extends TransitiveInfoProvider> List<T> unwrapProviders(
Iterable<? extends WrappingProvider> wrappingProviders, Class<T> providerClass) {
List<T> result = new ArrayList<>();
for (WrappingProvider wrappingProvider : wrappingProviders) {
T provider = wrappingProvider.getTransitiveInfoProviderMap().getProvider(providerClass);
if (provider != null) {
result.add(provider);
}
}
return result;
}
/** Reads a provider via a wrapping provider. Returns null if not wrapped. */
@Nullable
public static <T extends TransitiveInfoProvider, U extends WrappingProvider>
T getWrappedProvider(
TransitiveInfoCollection collection,
Class<U> wrappingProviderClass,
Class<T> providerClass) {
WrappingProvider wrappingProvider = collection.getProvider(wrappingProviderClass);
if (wrappingProvider != null) {
return wrappingProvider.getTransitiveInfoProviderMap().getProvider(providerClass);
}
return null;
}
}
}
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