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// Copyright 2017 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.config;
import com.google.devtools.build.lib.analysis.config.transitions.ComposingPatchTransition;
import com.google.devtools.build.lib.analysis.config.transitions.ConfigurationTransition;
import com.google.devtools.build.lib.analysis.config.transitions.PatchTransition;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.RuleTransitionFactory;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
/** A {@link RuleTransitionFactory} that composes other {@link RuleTransitionFactory}s. */
@AutoCodec
public class ComposingRuleTransitionFactory implements RuleTransitionFactory {
private final RuleTransitionFactory rtf1;
private final RuleTransitionFactory rtf2;
/**
* Creates a factory that applies the given factories in-order ({@code rtf1} first,
* {@code rtf2} second).
*/
public ComposingRuleTransitionFactory(RuleTransitionFactory rtf1, RuleTransitionFactory rtf2) {
this.rtf1 = rtf1;
this.rtf2 = rtf2;
}
@Override
public ConfigurationTransition buildTransitionFor(Rule rule) {
PatchTransition transition1 = (PatchTransition) rtf1.buildTransitionFor(rule);
PatchTransition transition2 = (PatchTransition) rtf2.buildTransitionFor(rule);
if (transition1 == null) {
return transition2;
}
if (transition2 == null) {
return transition1;
}
return new ComposingPatchTransition(
(PatchTransition) rtf1.buildTransitionFor(rule),
(PatchTransition) rtf2.buildTransitionFor(rule));
}
}
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