org.apache.commons.compress.compressors.xz.XZCompressorOutputStream Maven / Gradle / Ivy
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/*
* 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 Commons Compress 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 XZCompressorOutputStream(6).
*/
public XZCompressorOutputStream(OutputStream outputStream)
throws IOException {
out = new XZOutputStream(outputStream, new LZMA2Options());
}
/**
* Creates a new XZ compressor using the specified LZMA2 preset level.
*
* 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.
*
* 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));
}
/** {@inheritDoc} */
@Override
public void write(int b) throws IOException {
out.write(b);
}
/** {@inheritDoc} */
@Override
public void write(byte[] buf, int off, int len) throws IOException {
out.write(buf, off, len);
}
/**
* Flushes the encoder and calls outputStream.flush().
* 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();
}
/** {@inheritDoc} */
@Override
public void close() throws IOException {
out.close();
}
}