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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 com.google.devtools.build.lib.packages.ClassObjectConstructor;
import com.google.devtools.build.lib.packages.SkylarkClassObject;
import com.google.devtools.build.lib.packages.SkylarkProviderIdentifier;
import javax.annotation.Nullable;
/**
* Interface to mark classes that could contain transitive information added using the Skylark
* framework.
*/
public interface SkylarkProviderCollection {
/**
* Returns the transitive information requested or null, if the information is not found. The
* transitive information has to have been added using the Skylark framework.
*/
@Nullable
Object get(String providerKey);
/**
* Returns the declared provider requested, or null, if the information is not found. The
* transitive information has to have been added using the Skylark framework.
*/
@Nullable
SkylarkClassObject get(ClassObjectConstructor.Key providerKey);
/**
* Returns the provider defined in Skylark, or null, if the information is not found. The
* transitive information has to have been added using the Skylark framework.
*
* <p>This method dispatches to either {@link #get(ClassObjectConstructor.Key)} or {@link
* #get(String)} depending on whether {@link SkylarkProviderIdentifier} is for legacy or for
* declared provider.
*/
@Nullable
Object get(SkylarkProviderIdentifier id);
}
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