| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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.android.tools.build.apkzlib.zip.compress; |
| |
| import com.android.tools.build.apkzlib.zip.CompressionMethod; |
| import com.android.tools.build.apkzlib.zip.CompressionResult; |
| import com.android.tools.build.apkzlib.zip.utils.ByteTracker; |
| import com.android.tools.build.apkzlib.zip.utils.CloseableByteSource; |
| import java.io.ByteArrayOutputStream; |
| import java.util.concurrent.Executor; |
| import java.util.zip.Deflater; |
| import java.util.zip.DeflaterOutputStream; |
| import javax.annotation.Nonnull; |
| |
| /** |
| * Compressor that uses deflate with an executor. |
| */ |
| public class DeflateExecutionCompressor extends ExecutorCompressor { |
| |
| |
| /** |
| * Deflate compression level. |
| */ |
| private final int level; |
| |
| /** |
| * Byte tracker to use to create byte sources. |
| */ |
| @Nonnull |
| private final ByteTracker tracker; |
| |
| /** |
| * Creates a new compressor. |
| * |
| * @param executor the executor to run deflation tasks |
| * @param tracker the byte tracker to use to keep track of memory usage |
| * @param level the compression level |
| */ |
| public DeflateExecutionCompressor( |
| @Nonnull Executor executor, |
| @Nonnull ByteTracker tracker, |
| int level) { |
| super(executor); |
| |
| this.level = level; |
| this.tracker = tracker; |
| } |
| |
| @Nonnull |
| @Override |
| protected CompressionResult immediateCompress(@Nonnull CloseableByteSource source) |
| throws Exception { |
| ByteArrayOutputStream output = new ByteArrayOutputStream(); |
| Deflater deflater = new Deflater(level, true); |
| |
| try (DeflaterOutputStream dos = new DeflaterOutputStream(output, deflater)) { |
| dos.write(source.read()); |
| } |
| |
| CloseableByteSource result = tracker.fromStream(output); |
| if (result.size() >= source.size()) { |
| return new CompressionResult(source, CompressionMethod.STORE, source.size()); |
| } else { |
| return new CompressionResult(result, CompressionMethod.DEFLATE, result.size()); |
| } |
| } |
| } |