| // Copyright 2019 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.auto.value.AutoValue; |
| import com.google.devtools.build.lib.analysis.config.transitions.ConfigurationTransition; |
| import com.google.devtools.build.lib.analysis.config.transitions.NoTransition; |
| import com.google.devtools.build.lib.analysis.config.transitions.NullTransition; |
| import com.google.devtools.build.lib.analysis.config.transitions.SplitTransition; |
| import com.google.devtools.build.lib.analysis.config.transitions.TransitionFactory; |
| |
| /** Useful implementations of {@link TransitionFactory}. */ |
| // This class is in lib.analysis.config in order to access the now removed HostTransition, which |
| // is not visible to lib.analysis.config.transitions. |
| // TODO(b/253313672): move this to lib.analysis.config.transitions. |
| public final class TransitionFactories { |
| // Don't instantiate this class. |
| private TransitionFactories() {} |
| |
| /** Returns a {@link TransitionFactory} that wraps a static transition. */ |
| public static <T extends TransitionFactory.Data> TransitionFactory<T> of( |
| ConfigurationTransition transition) { |
| if (transition instanceof NoTransition) { |
| return NoTransition.createFactory(); |
| } else if (transition instanceof NullTransition) { |
| return NullTransition.createFactory(); |
| } else if (transition instanceof SplitTransition) { |
| return split((SplitTransition) transition); |
| } |
| return new AutoValue_TransitionFactories_IdentityFactory<T>(transition); |
| } |
| |
| /** Returns a {@link TransitionFactory} that wraps a static split transition. */ |
| public static <T extends TransitionFactory.Data> TransitionFactory<T> split( |
| SplitTransition splitTransition) { |
| return new AutoValue_TransitionFactories_SplitTransitionFactory<T>(splitTransition); |
| } |
| |
| /** A {@link TransitionFactory} implementation that wraps a static transition. */ |
| @AutoValue |
| abstract static class IdentityFactory<T extends TransitionFactory.Data> |
| implements TransitionFactory<T> { |
| |
| abstract ConfigurationTransition transition(); |
| |
| @Override |
| public ConfigurationTransition create(T data) { |
| return transition(); |
| } |
| } |
| |
| /** A {@link TransitionFactory} implementation that wraps a split transition. */ |
| @AutoValue |
| abstract static class SplitTransitionFactory<T extends TransitionFactory.Data> |
| implements TransitionFactory<T> { |
| abstract SplitTransition splitTransition(); |
| |
| @Override |
| public SplitTransition create(T data) { |
| return splitTransition(); |
| } |
| |
| @Override |
| public boolean isSplit() { |
| return true; |
| } |
| } |
| } |