/*
* 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 com.alimama.mdrill.utils.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");
}
}
}