| // 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.bazel.rules.ninja.file; |
| |
| import com.google.common.collect.Lists; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| |
| /** |
| * Task for splitting the contents of the {@link FileFragment} (with underlying {@link ByteBuffer}). |
| * Intended to be called in parallel for the fragments of the {@link ByteBuffer} for lexing the |
| * contents into independent logical declarations. |
| * |
| * <p>{@link ParallelFileProcessing} |
| */ |
| public class FileFragmentSplitter implements Callable<List<FileFragment>> { |
| private final FileFragment fileFragment; |
| private final DeclarationConsumer consumer; |
| |
| /** |
| * @param fileFragment {@link FileFragment}, fragment of which should be splitted |
| * @param consumer declaration consumer |
| */ |
| public FileFragmentSplitter(FileFragment fileFragment, DeclarationConsumer consumer) { |
| this.fileFragment = fileFragment; |
| this.consumer = consumer; |
| } |
| |
| /** |
| * Returns the list of {@link FileFragment} - fragments on the bounds of the current fragment, |
| * which should be potentially merged with neighbor fragments. |
| * |
| * <p>Combined list of {@link FileFragment} is passed to {@link DeclarationAssembler} for merging. |
| */ |
| @Override |
| public List<FileFragment> call() throws Exception { |
| List<FileFragment> fragments = Lists.newArrayList(); |
| int start = 0; |
| while (true) { |
| int end = NinjaSeparatorFinder.findNextSeparator(fileFragment, start, -1); |
| if (end < 0) { |
| break; |
| } |
| FileFragment fragment = fileFragment.subFragment(start, end + 1); |
| if (start > 0) { |
| consumer.declaration(fragment); |
| } else { |
| fragments.add(fragment); |
| } |
| start = end + 1; |
| } |
| // There is always at least one byte at the bounds of the fragment. |
| FileFragment lastFragment = fileFragment.subFragment(start, fileFragment.length()); |
| fragments.add(lastFragment); |
| return fragments; |
| } |
| } |