    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<OutputStream> {
    037    private boolean finished;
    038    private final AbstractStreamBridge abstractStreamBridge;
    039    private final Map<String, String> properties;
    040
    041    /**
    042     * Compresses the given stream, caching the compressed data in memory.
    043     *
    044     * @param out the stream to write to
    045     * @throws IOException if writing fails
    046     */
    047    public Pack200CompressorOutputStream(final OutputStream out) throws IOException {
    048        this(out, Pack200Strategy.IN_MEMORY);
    049    }
    050
    051    /**
    052     * Compresses the given stream, caching the compressed data in memory and using the given properties.
    053     *
    054     * @param out   the stream to write to
    055     * @param props Pack200 properties to use
    056     * @throws IOException if writing fails
    057     */
    058    public Pack200CompressorOutputStream(final OutputStream out, final Map<String, String> props) throws IOException {
    059        this(out, Pack200Strategy.IN_MEMORY, props);
    060    }
    061
    062    /**
    063     * Compresses the given stream using the given strategy to cache the results.
    064     *
    065     * @param out  the stream to write to
    066     * @param mode the strategy to use
    067     * @throws IOException if writing fails
    068     */
    069    public Pack200CompressorOutputStream(final OutputStream out, final Pack200Strategy mode) throws IOException {
    070        this(out, mode, null);
    071    }
    072
    073    /**
    074     * Compresses the given stream using the given strategy to cache the results and the given properties.
    075     *
    076     * @param out   the stream to write to
    077     * @param mode  the strategy to use
    078     * @param props Pack200 properties to use
    079     * @throws IOException if writing fails
    080     */
    081    public Pack200CompressorOutputStream(final OutputStream out, final Pack200Strategy mode, final Map<String, String> props) throws IOException {
    082        super(out);
    083        abstractStreamBridge = mode.newStreamBridge();
    084        properties = props;
    085    }
    086
    087    @Override
    088    public void close() throws IOException {
    089        try {
    090            finish();
    091        } finally {
    092            try {
    093                abstractStreamBridge.stop();
    094            } finally {
    095                out.close();
    096            }
    097        }
    098    }
    099
    100    public void finish() throws IOException {
    101        if (!finished) {
    102            finished = true;
    103            final Pack200.Packer p = Pack200.newPacker();
    104            if (properties != null) {
    105                p.properties().putAll(properties);
    106            }
    107            try (JarInputStream ji = new JarInputStream(abstractStreamBridge.getInputStream())) {
    108                p.pack(ji, out);
    109            }
    110        }
    111    }
    112
    113    @Override
    114    public void write(final byte[] b) throws IOException {
    115        abstractStreamBridge.write(b);
    116    }
    117
    118    @Override
    119    public void write(final byte[] b, final int from, final int length) throws IOException {
    120        abstractStreamBridge.write(b, from, length);
    121    }
    122
    123    @Override
    124    public void write(final int b) throws IOException {
    125        abstractStreamBridge.write(b);
    126    }
    127}