| // 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.actions; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import com.google.devtools.build.lib.actions.ActionExecutionContext; |
| import com.google.devtools.build.lib.actions.ActionKeyContext; |
| import com.google.devtools.build.lib.actions.ActionOwner; |
| import com.google.devtools.build.lib.actions.Artifact; |
| import com.google.devtools.build.lib.actions.Artifact.ArtifactExpander; |
| import com.google.devtools.build.lib.actions.CommandLineExpansionException; |
| import com.google.devtools.build.lib.collect.nestedset.NestedSet; |
| import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder; |
| import com.google.devtools.build.lib.collect.nestedset.Order; |
| import com.google.devtools.build.lib.util.Fingerprint; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import javax.annotation.Nullable; |
| import net.starlark.java.eval.Tuple; |
| |
| /** |
| * Lazily writes the content of a nested set of tuplesToWrite to an output file. |
| * |
| * <p>Writes delimiter separated Tuple elements to the output file. |
| */ |
| public final class LazyWriteNestedSetOfTupleAction extends AbstractFileWriteAction { |
| |
| private final NestedSet<Tuple> tuplesToWrite; |
| private String fileContents; |
| private final String delimiter; |
| |
| public LazyWriteNestedSetOfTupleAction( |
| ActionOwner owner, Artifact output, NestedSet<Tuple> tuplesToWrite, String delimiter) { |
| super( |
| owner, NestedSetBuilder.emptySet(Order.STABLE_ORDER), output, /* makeExecutable= */ false); |
| this.tuplesToWrite = tuplesToWrite; |
| this.delimiter = delimiter; |
| } |
| |
| @Override |
| public DeterministicWriter newDeterministicWriter(ActionExecutionContext ctx) { |
| return new DeterministicWriter() { |
| @Override |
| public void writeOutputFile(OutputStream out) throws IOException { |
| out.write(getContents(delimiter).getBytes(UTF_8)); |
| } |
| }; |
| } |
| |
| /** Computes the Action key for this action by computing the fingerprint for the file contents. */ |
| @Override |
| protected void computeKey( |
| ActionKeyContext actionKeyContext, |
| @Nullable ArtifactExpander artifactExpander, |
| Fingerprint fp) |
| throws CommandLineExpansionException, InterruptedException { |
| actionKeyContext.addNestedSetToFingerprint(fp, tuplesToWrite); |
| } |
| |
| private String getContents(String delimiter) { |
| if (fileContents == null) { |
| StringBuilder stringBuilder = new StringBuilder(); |
| for (Tuple tuple : tuplesToWrite.toList()) { |
| if (tuple.isEmpty()) { |
| continue; |
| } |
| stringBuilder.append(tuple.get(0)); |
| for (int i = 1; i < tuple.size(); i++) { |
| stringBuilder.append(delimiter).append(tuple.get(i)); |
| } |
| stringBuilder.append(System.lineSeparator()); |
| } |
| fileContents = stringBuilder.toString(); |
| } |
| return fileContents; |
| } |
| } |