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// Copyright 2016 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.rules;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.FileProvider;
import com.google.devtools.build.lib.analysis.SkylarkProviders;
import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.syntax.ClassObject;
import com.google.devtools.build.lib.syntax.SkylarkNestedSet;
import com.google.devtools.build.lib.util.Preconditions;
import javax.annotation.Nullable;
/**
* This configured target pretends to be whatever type of target "actual" is, returning its
* transitive info providers and target, but returning its own label.
*
* <p>Transitive info providers can also be overridden.
*/
@Immutable
public final class AliasConfiguredTarget implements ConfiguredTarget, ClassObject {
private final BuildConfiguration configuration;
private final ConfiguredTarget actual;
private final ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider>
overrides;
public AliasConfiguredTarget(
BuildConfiguration configuration,
@Nullable ConfiguredTarget actual,
ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider> overrides) {
this.configuration = Preconditions.checkNotNull(configuration);
this.actual = actual;
this.overrides = Preconditions.checkNotNull(overrides);
}
@Override
public <P extends TransitiveInfoProvider> P getProvider(Class<P> provider) {
if (overrides.containsKey(provider)) {
return provider.cast(overrides.get(provider));
}
return actual == null ? null : actual.getProvider(provider);
}
@Override
public Label getLabel() {
return actual.getLabel();
}
@Override
public Object get(String providerKey) {
return actual == null ? null : actual.get(providerKey);
}
@Override
public Target getTarget() {
return actual == null ? null : actual.getTarget();
}
@Override
public BuildConfiguration getConfiguration() {
// This does not return actual.getConfiguration() because actual might be an input file, in
// which case its configuration is null and we don't want to have rules that have a null
// configuration.
return configuration;
}
/* ClassObject methods */
@Override
public Object getValue(String name) {
if (name.equals("label")) {
return getLabel();
} else if (name.equals("files")) {
// A shortcut for files to build in Skylark. FileConfiguredTarget and RunleConfiguredTarget
// always has FileProvider and Error- and PackageGroupConfiguredTarget-s shouldn't be
// accessible in Skylark.
return SkylarkNestedSet.of(Artifact.class, actual == null
? NestedSetBuilder.<Artifact>emptySet(Order.STABLE_ORDER)
: getProvider(FileProvider.class).getFilesToBuild());
}
return actual == null ? null : actual.get(name);
}
@Override
public ImmutableCollection<String> getKeys() {
ImmutableList.Builder<String> result = ImmutableList.<String>builder().add("label", "files");
if (actual != null) {
result.addAll(actual.getProvider(SkylarkProviders.class).getKeys());
}
return result.build();
}
@Override
public String errorMessage(String name) {
// Use the default error message.
return null;
}
}
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