| // Copyright 2016 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.android.dexer; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| |
| import com.android.dex.Dex; |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.concurrent.atomic.AtomicReference; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipOutputStream; |
| |
| /** |
| * Wrapper around a {@link ZipOutputStream} to simplify writing archives with {@code .dex} files. |
| * Adding files generally requires a {@link ZipEntry} in order to control timestamps. |
| */ |
| // TODO(kmb): Remove this class and inline into DexFileAggregator |
| class DexFileArchive implements Closeable { |
| |
| private final ZipOutputStream out; |
| |
| /** |
| * Used to ensure writes from different threads are sequenced, which {@link DexFileAggregator} |
| * ensures by making the writer futures wait on each oter. |
| */ |
| private final AtomicReference<ZipEntry> inUse = new AtomicReference<>(null); |
| |
| public DexFileArchive(ZipOutputStream out) { |
| this.out = out; |
| } |
| |
| /** |
| * Adds a {@code .dex} file with the given details. |
| */ |
| public DexFileArchive addFile(ZipEntry entry, Dex dex) throws IOException { |
| checkState(inUse.compareAndSet(null, entry), "Already in use"); |
| entry.setSize(dex.getLength()); |
| out.putNextEntry(entry); |
| dex.writeTo(out); |
| out.closeEntry(); |
| checkState(inUse.compareAndSet(entry, null), "Swooped in: ", inUse.get()); |
| return this; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| checkState(inUse.get() == null, "Still in use: ", inUse.get()); |
| out.close(); |
| } |
| } |