| // Copyright 2023 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.actions; |
| |
| import java.io.IOException; |
| |
| /** A {@link InputMetadataProvider} implementation that consults two others in a given order. */ |
| public final class DelegatingPairInputMetadataProvider implements InputMetadataProvider { |
| |
| private final InputMetadataProvider primary; |
| private final InputMetadataProvider secondary; |
| |
| public DelegatingPairInputMetadataProvider( |
| InputMetadataProvider primary, InputMetadataProvider secondary) { |
| this.primary = primary; |
| this.secondary = secondary; |
| } |
| |
| @Override |
| public FileArtifactValue getInputMetadata(ActionInput input) throws IOException { |
| FileArtifactValue metadata = primary.getInputMetadata(input); |
| return (metadata != null) && (metadata != FileArtifactValue.MISSING_FILE_MARKER) |
| ? metadata |
| : secondary.getInputMetadata(input); |
| } |
| |
| @Override |
| public ActionInput getInput(String execPath) { |
| ActionInput input = primary.getInput(execPath); |
| return input != null ? input : secondary.getInput(execPath); |
| } |
| } |