| // 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.transitions; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Iterables; |
| import com.google.devtools.build.lib.analysis.config.BuildOptions; |
| import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec; |
| |
| /** |
| * A {@link ComposingSplitTransition} that only supports {@link PatchTransition}s |
| * |
| * <p>Calling code that doesn't want to have to handle splits should prefer this version. |
| */ |
| @AutoCodec |
| public class ComposingPatchTransition implements PatchTransition { |
| private final ComposingSplitTransition delegate; |
| |
| /** |
| * Creates a {@link ComposingPatchTransition} that applies the sequence: {@code fromOptions -> |
| * transition1 -> transition2 -> toOptions }. |
| * |
| * <p>Note that it's possible to create silly transitions with this constructor (e.g., if one or |
| * both of the transitions is NoTransition). Use composePatchTransitions instead, which checks for |
| * these states and avoids instantiation appropriately. |
| * |
| * @see TransitionResolver#composePatchTransitions |
| */ |
| public ComposingPatchTransition(PatchTransition transition1, PatchTransition transition2) { |
| this(new ComposingSplitTransition(transition1, transition2)); |
| } |
| |
| @AutoCodec.Instantiator |
| ComposingPatchTransition(ComposingSplitTransition delegate) { |
| Preconditions.checkArgument(delegate.isPatchOnly()); |
| this.delegate = delegate; |
| } |
| |
| @Override |
| public BuildOptions apply(BuildOptions options) { |
| return Iterables.getOnlyElement(delegate.split(options)); |
| } |
| |
| @Override |
| public String getName() { |
| return delegate.getName(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return delegate.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| return other instanceof ComposingPatchTransition |
| && ((ComposingPatchTransition) other).delegate.equals(this.delegate); |
| } |
| } |
| |