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Apache Commons Compress defines an API for working with compression and archive formats. These include bzip2, gzip, pack200, LZMA, XZ, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.

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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.commons.compress.archivers.jar;

import java.security.cert.Certificate;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;

import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;

/**
 *
 * @NotThreadSafe (parent is not thread-safe)
 */
public class JarArchiveEntry extends ZipArchiveEntry {

    // These are always null - see https://issues.apache.org/jira/browse/COMPRESS-18 for discussion
    private final Attributes manifestAttributes = null;
    private final Certificate[] certificates = null;

    public JarArchiveEntry(ZipEntry entry) throws ZipException {
        super(entry);
    }

    public JarArchiveEntry(String name) {
        super(name);
    }

    public JarArchiveEntry(ZipArchiveEntry entry) throws ZipException {
        super(entry);
    }

    public JarArchiveEntry(JarEntry entry) throws ZipException {
        super(entry);

    }

    /**
     * This method is not implemented and won't ever be.
     * The JVM equivalent has a different name {@link java.util.jar.JarEntry#getAttributes()}
     *
     * @deprecated since 1.5, do not use; always returns null
     * @return Always returns null.
     */
    @Deprecated
    public Attributes getManifestAttributes() {
        return manifestAttributes;
    }

    /**
     * Return a copy of the list of certificates or null if there are none.
     *
     * @return Always returns null in the current implementation
     *
     * @deprecated since 1.5, not currently implemented
     */
    @Deprecated
    public Certificate[] getCertificates() {
        if (certificates != null) { // never true currently
            Certificate[] certs = new Certificate[certificates.length];
            System.arraycopy(certificates, 0, certs, 0, certs.length);
            return certs;
        }
        /*
         * Note, the method
         * Certificate[] java.util.jar.JarEntry.getCertificates()
         * also returns null or the list of certificates (but not copied)
         */
        return null;
    }

}