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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.rules.extra;
import com.google.common.collect.Multimap;
import com.google.common.collect.Sets;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.Runfiles;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
import com.google.devtools.build.lib.collect.ImmutableSortedKeyListMultimap;
import com.google.devtools.build.lib.packages.Type;
import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
/**
* Implementation for the 'action_listener' rule.
*/
public final class ActionListener implements RuleConfiguredTargetFactory {
@Override
public ConfiguredTarget create(RuleContext ruleContext) {
// This rule doesn't produce any output when listed as a build target.
// Only when used via the --experimental_action_listener flag,
// this rule instructs the build system to add additional outputs.
List<ExtraActionSpec> extraActions;
Multimap<String, ExtraActionSpec> extraActionMap;
Set<String> mnemonics = Sets.newHashSet(
ruleContext.attributes().get("mnemonics", Type.STRING_LIST));
extraActions = retrieveAndValidateExtraActions(ruleContext);
ImmutableSortedKeyListMultimap.Builder<String, ExtraActionSpec>
extraActionMapBuilder = ImmutableSortedKeyListMultimap.builder();
for (String mnemonic : mnemonics) {
extraActionMapBuilder.putAll(mnemonic, extraActions);
}
extraActionMap = extraActionMapBuilder.build();
return new RuleConfiguredTargetBuilder(ruleContext)
.add(RunfilesProvider.class, RunfilesProvider.simple(Runfiles.EMPTY))
.add(ExtraActionMapProvider.class, new ExtraActionMapProvider(extraActionMap))
.build();
}
/**
* Loads the targets listed in the 'extra_actions' attribute of this rule.
* Validates these targets to be extra_actions indeed. And checks if the
* blaze version number is in the range of the blaze_version restrictions on the rule.
*/
private List<ExtraActionSpec> retrieveAndValidateExtraActions(RuleContext ruleContext) {
List<ExtraActionSpec> extraActions = new ArrayList<>();
for (TransitiveInfoCollection prerequisite :
ruleContext.getPrerequisites("extra_actions", Mode.TARGET)) {
ExtraActionSpec spec = prerequisite.getProvider(ExtraActionSpec.class);
if (spec == null) {
ruleContext.attributeError("extra_actions", String.format("target %s is not an "
+ "extra_action rule", prerequisite.getLabel().toString()));
} else {
extraActions.add(spec);
}
}
if (extraActions.size() == 0) {
ruleContext.attributeWarning("extra_actions",
"No extra_action is specified for this version of blaze.");
}
return extraActions;
}
}
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