| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.commons.compress.compressors.xz; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import org.tukaani.xz.LZMA2Options; |
| import org.tukaani.xz.XZOutputStream; |
| |
| import org.apache.commons.compress.compressors.CompressorOutputStream; |
| |
| /** |
| * XZ compressor. |
| * @since 1.4 |
| */ |
| public class XZCompressorOutputStream extends CompressorOutputStream { |
| private final XZOutputStream out; |
| |
| /** |
| * Creates a new XZ compressor using the default LZMA2 options. |
| * This is equivalent to <code>XZCompressorOutputStream(6)</code>. |
| */ |
| public XZCompressorOutputStream(OutputStream outputStream) |
| throws IOException { |
| out = new XZOutputStream(outputStream, new LZMA2Options()); |
| } |
| |
| /** |
| * Creates a new XZ compressor using the specified LZMA2 preset level. |
| * <p> |
| * The presets 0-3 are fast presets with medium compression. |
| * The presets 4-6 are fairly slow presets with high compression. |
| * The default preset is 6. |
| * <p> |
| * The presets 7-9 are like the preset 6 but use bigger dictionaries |
| * and have higher compressor and decompressor memory requirements. |
| * Unless the uncompressed size of the file exceeds 8 MiB, |
| * 16 MiB, or 32 MiB, it is waste of memory to use the |
| * presets 7, 8, or 9, respectively. |
| */ |
| public XZCompressorOutputStream(OutputStream outputStream, int preset) |
| throws IOException { |
| out = new XZOutputStream(outputStream, new LZMA2Options(preset)); |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| out.write(b); |
| } |
| |
| @Override |
| public void write(byte[] buf, int off, int len) throws IOException { |
| out.write(buf, off, len); |
| } |
| |
| /** |
| * Flushes the encoder and calls <code>outputStream.flush()</code>. |
| * All buffered pending data will then be decompressible from |
| * the output stream. Calling this function very often may increase |
| * the compressed file size a lot. |
| */ |
| @Override |
| public void flush() throws IOException { |
| out.flush(); |
| } |
| |
| /** |
| * Finishes compression without closing the underlying stream. |
| * No more data can be written to this stream after finishing. |
| */ |
| public void finish() throws IOException { |
| out.finish(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| out.close(); |
| } |
| } |