    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 * http://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019
    020package org.apache.commons.compress.compressors.pack200;
    021
    022import java.io.IOException;
    023import java.io.OutputStream;
    024import java.util.Map;
    025import java.util.jar.JarInputStream;
    026
    027import org.apache.commons.compress.compressors.CompressorOutputStream;
    028import org.apache.commons.compress.java.util.jar.Pack200;
    029
    030/**
    031 * An output stream that compresses using the Pack200 format.
    032 *
    033 * @NotThreadSafe
    034 * @since 1.3
    035 */
    036public class Pack200CompressorOutputStream extends CompressorOutputStream {
    037    private boolean finished;
    038    private final OutputStream originalOutput;
    039    private final StreamBridge streamBridge;
    040    private final Map<String, String> properties;
    041
    042    /**
    043     * Compresses the given stream, caching the compressed data in
    044     * memory.
    045     *
    046     * @param out the stream to write to
    047     * @throws IOException if writing fails
    048     */
    049    public Pack200CompressorOutputStream(final OutputStream out)
    050        throws IOException {
    051        this(out, Pack200Strategy.IN_MEMORY);
    052    }
    053
    054    /**
    055     * Compresses the given stream, caching the compressed data in
    056     * memory and using the given properties.
    057     *
    058     * @param out the stream to write to
    059     * @param props Pack200 properties to use
    060     * @throws IOException if writing fails
    061     */
    062    public Pack200CompressorOutputStream(final OutputStream out,
    063                                         final Map<String, String> props)
    064        throws IOException {
    065        this(out, Pack200Strategy.IN_MEMORY, props);
    066    }
    067
    068    /**
    069     * Compresses the given stream using the given strategy to cache
    070     * the results.
    071     *
    072     * @param out the stream to write to
    073     * @param mode the strategy to use
    074     * @throws IOException if writing fails
    075     */
    076    public Pack200CompressorOutputStream(final OutputStream out,
    077                                         final Pack200Strategy mode)
    078        throws IOException {
    079        this(out, mode, null);
    080    }
    081
    082    /**
    083     * Compresses the given stream using the given strategy to cache
    084     * the results and the given properties.
    085     *
    086     * @param out the stream to write to
    087     * @param mode the strategy to use
    088     * @param props Pack200 properties to use
    089     * @throws IOException if writing fails
    090     */
    091    public Pack200CompressorOutputStream(final OutputStream out,
    092                                         final Pack200Strategy mode,
    093                                         final Map<String, String> props)
    094        throws IOException {
    095        originalOutput = out;
    096        streamBridge = mode.newStreamBridge();
    097        properties = props;
    098    }
    099
    100    @Override
    101    public void close() throws IOException {
    102        try {
    103            finish();
    104        } finally {
    105            try {
    106                streamBridge.stop();
    107            } finally {
    108                originalOutput.close();
    109            }
    110        }
    111    }
    112
    113    public void finish() throws IOException {
    114        if (!finished) {
    115            finished = true;
    116            final Pack200.Packer p = Pack200.newPacker();
    117            if (properties != null) {
    118                p.properties().putAll(properties);
    119            }
    120            try (JarInputStream ji = new JarInputStream(streamBridge.getInput())) {
    121                p.pack(ji, originalOutput);
    122            }
    123        }
    124    }
    125
    126    @Override
    127    public void write(final byte[] b) throws IOException {
    128        streamBridge.write(b);
    129    }
    130
    131    @Override
    132    public void write(final byte[] b, final int from, final int length) throws IOException {
    133        streamBridge.write(b, from, length);
    134    }
    135
    136    @Override
    137    public void write(final int b) throws IOException {
    138        streamBridge.write(b);
    139    }
    140}