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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.base.Preconditions;
import com.google.common.collect.ImmutableCollection;
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.RuleContext;
import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.Info;
import com.google.devtools.build.lib.packages.Provider;
import com.google.devtools.build.lib.skyframe.BuildConfigurationValue;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec.VisibleForSerialization;
import com.google.devtools.build.lib.skylarkinterface.SkylarkPrinter;
import com.google.devtools.build.lib.syntax.ClassObject;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.SkylarkNestedSet;
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.
*/
@AutoCodec
@Immutable
public final class AliasConfiguredTarget implements ConfiguredTarget, ClassObject {
private final Label label;
private final BuildConfigurationValue.Key configurationKey;
private final ConfiguredTarget actual;
private final ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider>
overrides;
public AliasConfiguredTarget(
RuleContext ruleContext,
ConfiguredTarget actual,
ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider> overrides) {
this(
ruleContext.getLabel(),
Preconditions.checkNotNull(ruleContext.getConfigurationKey()),
Preconditions.checkNotNull(actual),
Preconditions.checkNotNull(overrides));
}
@AutoCodec.Instantiator
@VisibleForSerialization
AliasConfiguredTarget(
Label label,
BuildConfigurationValue.Key configurationKey,
ConfiguredTarget actual,
ImmutableMap<Class<? extends TransitiveInfoProvider>, TransitiveInfoProvider> overrides) {
this.label = label;
this.configurationKey = configurationKey;
this.actual = actual;
this.overrides = overrides;
}
@Override
public <P extends TransitiveInfoProvider> P getProvider(Class<P> provider) {
if (overrides.containsKey(provider)) {
return provider.cast(overrides.get(provider));
}
return actual.getProvider(provider);
}
@Override
public Label getLabel() {
return actual.getLabel();
}
@Override
public Object get(String providerKey) {
return actual.get(providerKey);
}
@Nullable
@Override
public Info get(Provider.Key providerKey) {
return actual.get(providerKey);
}
@Override
public Object getIndex(Object key, Location loc) throws EvalException {
return actual.getIndex(key, loc);
}
@Override
public boolean containsKey(Object key, Location loc) throws EvalException {
return actual.containsKey(key, loc);
}
@Override
public BuildConfigurationValue.Key getConfigurationKey() {
// This does not return actual.getConfigurationKey() because actual might be an input file, in
// which case its configurationKey is null and we don't want to have rules that have a null
// configurationKey.
return configurationKey;
}
/* ClassObject methods */
@Override
public Object getValue(String name) {
if (name.equals(LABEL_FIELD)) {
return getLabel();
} else if (name.equals(FILES_FIELD)) {
// A shortcut for files to build in Skylark. FileConfiguredTarget and RuleConfiguredTarget
// always has FileProvider and Error- and PackageGroupConfiguredTarget-s shouldn't be
// accessible in Skylark.
return SkylarkNestedSet.of(Artifact.class, getProvider(FileProvider.class).getFilesToBuild());
}
return actual.getValue(name);
}
@Override
public ImmutableCollection<String> getFieldNames() {
return actual.getFieldNames();
}
@Override
public String getErrorMessageForUnknownField(String name) {
// Use the default error message.
return null;
}
/**
* Returns a target this target aliases.
*/
public ConfiguredTarget getActual() {
return actual;
}
public Label getOriginalLabel() {
return label;
}
@Override
public void repr(SkylarkPrinter printer) {
printer.append("<alias target " + label + " of " + actual.getLabel() + ">");
}
}
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