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// Copyright 2014 Google Inc. 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.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.UnmodifiableIterator;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Extra information about a configured target computed on request of a dependent.
*
* <p>Analogous to {@link ConfiguredTarget}: contains a bunch of transitive info providers, which
* are merged with the providers of the associated configured target before they are passed to
* the configured target factories that depend on the configured target to which this aspect is
* added.
*
* <p>Aspects are created alongside configured targets on request from dependents.
*/
@Immutable
public final class Aspect implements Iterable<TransitiveInfoProvider> {
private final
ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider> providers;
private Aspect(
ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider> providers) {
this.providers = providers;
}
/**
* Returns the providers created by the aspect.
*/
public ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider>
getProviders() {
return providers;
}
@Override
public UnmodifiableIterator<TransitiveInfoProvider> iterator() {
return providers.values().iterator();
}
/**
* Builder for {@link Aspect}.
*/
public static class Builder {
private final Map<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider>
providers = new LinkedHashMap<>();
/**
* Adds a provider to the aspect.
*/
public Builder addProvider(
Class<? extends TransitiveInfoProvider> key, TransitiveInfoProvider value) {
Preconditions.checkNotNull(key);
Preconditions.checkNotNull(value);
AnalysisUtils.checkProvider(key);
Preconditions.checkState(!providers.containsKey(key));
providers.put(key, value);
return this;
}
public Aspect build() {
return new Aspect(ImmutableMap.copyOf(providers));
}
}
}
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