    001/*
    002 *  Licensed to the Apache Software Foundation (ASF) under one or more
    003 *  contributor license agreements.  See the NOTICE file distributed with
    004 *  this work for additional information regarding copyright ownership.
    005 *  The ASF licenses this file to You under the Apache License, Version 2.0
    006 *  (the "License"); you may not use this file except in compliance with
    007 *  the License.  You may obtain a copy of the License at
    008 *
    009 *     http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 */
    017package org.apache.commons.compress.harmony.unpack200;
    018
    019import java.io.BufferedInputStream;
    020import java.io.File;
    021import java.io.FileInputStream;
    022import java.io.IOException;
    023import java.io.InputStream;
    024import java.util.jar.JarOutputStream;
    025
    026import org.apache.commons.compress.harmony.pack200.Pack200Adapter;
    027import org.apache.commons.compress.harmony.pack200.Pack200Exception;
    028import org.apache.commons.compress.java.util.jar.Pack200.Unpacker;
    029
    030/**
    031 * This class provides the binding between the standard Pack200 interface and the internal interface for (un)packing. As
    032 * this uses generics for the SortedMap, this class must be compiled and run on a Java 1.5 system. However, Java 1.5 is
    033 * not necessary to use the internal libraries for unpacking.
    034 */
    035public class Pack200UnpackerAdapter extends Pack200Adapter implements Unpacker {
    036    /*
    037     * (non-Javadoc)
    038     *
    039     * @see org.apache.commons.compress.java.util.jar.Pack200.Unpacker#unpack(java.io.InputStream,
    040     * java.util.jar.JarOutputStream)
    041     */
    042    @Override
    043    public void unpack(final InputStream in, final JarOutputStream out) throws IOException {
    044        if (in == null || out == null) {
    045            throw new IllegalArgumentException("Must specify both input and output streams");
    046        }
    047        completed(0);
    048        try {
    049            new Archive(in, out).unpack();
    050        } catch (final Pack200Exception e) {
    051            throw new IOException("Failed to unpack Jar:" + String.valueOf(e));
    052        }
    053        completed(1);
    054        in.close();
    055    }
    056
    057    /*
    058     * (non-Javadoc)
    059     *
    060     * @see org.apache.commons.compress.java.util.jar.Pack200.Unpacker#unpack(java.io.File,
    061     * java.util.jar.JarOutputStream)
    062     */
    063    @Override
    064    public void unpack(final File file, final JarOutputStream out) throws IOException {
    065        if (file == null || out == null) {
    066            throw new IllegalArgumentException("Must specify both input and output streams");
    067        }
    068        final int size = (int) file.length();
    069        final int bufferSize = (size > 0 && size < DEFAULT_BUFFER_SIZE ? size : DEFAULT_BUFFER_SIZE);
    070        final InputStream in = new BufferedInputStream(new FileInputStream(file), bufferSize);
    071        unpack(in, out);
    072    }
    073}