jarmarker.java

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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.tools.zip;import java.util.zip.ZipException;/** * If this extra field is added as the very first extra field of the * archive, Solaris will consider it an executable jar file. * * @since Ant 1.6.3 */public final class JarMarker implements ZipExtraField {    private static final ZipShort ID = new ZipShort(0xCAFE);    private static final ZipShort NULL = new ZipShort(0);    private static final byte[] NO_BYTES = new byte[0];    private static final JarMarker DEFAULT = new JarMarker();    /** No-arg constructor */    public JarMarker() {        // empty    }    /**     * Since JarMarker is stateless we can always use the same instance.     * @return the DEFAULT jarmaker.     */    public static JarMarker getInstance() {        return DEFAULT;    }    /**     * The Header-ID.     * @return the header id     */    public ZipShort getHeaderId() {        return ID;    }    /**     * Length of the extra field in the local file data - without     * Header-ID or length specifier.     * @return 0     */    public ZipShort getLocalFileDataLength() {        return NULL;    }    /**     * Length of the extra field in the central directory - without     * Header-ID or length specifier.     * @return 0     */    public ZipShort getCentralDirectoryLength() {        return NULL;    }    /**     * The actual data to put into local file data - without Header-ID     * or length specifier.     * @return the data     * @since 1.1     */    public byte[] getLocalFileDataData() {        return NO_BYTES;    }    /**     * The actual data to put central directory - without Header-ID or     * length specifier.     * @return the data     */    public byte[] getCentralDirectoryData() {        return NO_BYTES;    }    /**     * Populate data from this array as if it was in local file data.     * @param data an array of bytes     * @param offset the start offset     * @param length the number of bytes in the array from offset     *     * @throws ZipException on error     */    public void parseFromLocalFileData(byte[] data, int offset, int length)        throws ZipException {        if (length != 0) {            throw new ZipException("JarMarker doesn't expect any data");        }    }}

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