src/main/java/com/google/devtools/build/lib/analysis/TransitiveInfoProviderMapImmutableMapBased.java

// Copyright 2014 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.common.collect.ImmutableMap;
import java.util.Map;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

/** Provides a mapping between a TransitiveInfoProvider class and an instance. */
@Immutable
final class TransitiveInfoProviderMapImmutableMapBased implements TransitiveInfoProviderMap {

  private final ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider> map;

  TransitiveInfoProviderMapImmutableMapBased(
      ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider> map) {
    this.map = map;
  }

  /** Returns the instance for the provided providerClass, or <tt>null</tt> if not present. */
  @Override
  @Nullable
  public <P extends TransitiveInfoProvider> P getProvider(Class<P> providerClass) {
    return (P) map.get(TransitiveInfoProviderEffectiveClassHelper.get(providerClass));
  }

  @Override
  public Iterable<Map.Entry<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider>>
      entries() {
    return map.entrySet();
  }

  @Override
  public Iterable<TransitiveInfoProvider> values() {
    return map.values();
  }
}