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// 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();
}
}
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