    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 */
    019package org.apache.commons.compress.archivers.jar;
    020
    021import java.io.IOException;
    022import java.io.OutputStream;
    023
    024import org.apache.commons.compress.archivers.zip.JarMarker;
    025import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
    026import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
    027
    028/**
    029 * Subclass that adds a special extra field to the very first entry which allows the created archive to be used as an executable jar on Solaris.
    030 *
    031 * @NotThreadSafe
    032 */
    033public class JarArchiveOutputStream extends ZipArchiveOutputStream {
    034
    035    private boolean jarMarkerAdded;
    036
    037    public JarArchiveOutputStream(final OutputStream out) {
    038        super(out);
    039    }
    040
    041    /**
    042     * Constructs a new instance that wraps the output stream using the provided encoding.
    043     *
    044     * @param out      the output stream to wrap
    045     * @param encoding the encoding to use. Use null for the platform default.
    046     * @since 1.10
    047     */
    048    public JarArchiveOutputStream(final OutputStream out, final String encoding) {
    049        super(out);
    050        setEncoding(encoding);
    051    }
    052
    053    // @throws ClassCastException if entry is not an instance of ZipArchiveEntry
    054    @Override
    055    public void putArchiveEntry(final ZipArchiveEntry entry) throws IOException {
    056        if (!jarMarkerAdded) {
    057            entry.addAsFirstExtraField(JarMarker.getInstance());
    058            jarMarkerAdded = true;
    059        }
    060        super.putArchiveEntry(entry);
    061    }
    062}