[COMPRESS-369] Allow archiver extensions through a standard JRE ServiceLoader

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.13
• Component/s: Archivers
• Assignee: Gary D. Gregory
• Reporter: Gary D. Gregory
• Created: 16/Nov/16 04:22
• Updated: 16/Nov/16 06:32
• Resolved: 16/Nov/16 06:31

Description

Allow archiver extensions through a standard JRE ServiceLoader.

Introduce a new interface org.apache.commons.compress.archivers.ArchiveStreamProvider.

Update ArchiveStreamFactory to implement this new interface and use a service loader to pick up extra ArchiveStreamProvider.

The service loader file is META-INF/services/org.apache.commons.compress.archivers.ArchiveStreamProvider

The new interface:

/*
 * 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;

import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;

/**
 * Creates Archive {@link ArchiveInputStream}s and {@link ArchiveOutputStream}s.
 * 
 * @since 1.13
 */
public interface ArchiveStreamProvider {

    /**
     * Creates an archive input stream from an archiver name and an input
     * stream.
     * 
     * @param archiverName
     *            the archive name, i.e. {@value #AR}, {@value #ARJ},
     *            {@value #ZIP}, {@value #TAR}, {@value #JAR}, {@value #CPIO},
     *            {@value #DUMP} or {@value #SEVEN_Z}
     * @param in
     *            the input stream
     * @param encoding,
     *            or null for the default
     * @return the archive input stream
     * @throws ArchiveException
     *             if the archiver name is not known
     * @throws StreamingNotSupportedException
     *             if the format cannot be read from a stream
     * @throws IllegalArgumentException
     *             if the archiver name or stream is null
     */
    ArchiveInputStream createArchiveInputStream(final String name, final InputStream in, final String encoding)
            throws ArchiveException;

    /**
     * Creates an archive output stream from an archiver name and an output
     * stream.
     * 
     * @param archiverName
     *            the archive name, i.e. {@value #AR}, {@value #ZIP},
     *            {@value #TAR}, {@value #JAR} or {@value #CPIO}
     * @param out
     *            the output stream
     * @param encoding,
     *            or null for the default
     * @return the archive output stream
     * @throws ArchiveException
     *             if the archiver name is not known
     * @throws StreamingNotSupportedException
     *             if the format cannot be written to a stream
     * @throws IllegalArgumentException
     *             if the archiver name or stream is null
     */
    ArchiveOutputStream createArchiveOutputStream(final String name, final OutputStream out, final String encoding)
            throws ArchiveException;

    /**
     * Gets all the input stream archive names for this provider
     * 
     * @return all the input archive names for this provider
     */
    Set<String> getInputStreamArchiveNames();

    /**
     * Gets all the output stream archive names for this provider
     * 
     * @return all the output archive names for this provider
     */
    Set<String> getOutputStreamArchiveNames();

}

Issue Links

• relates to: COMPRESS-368 Allow compressor extensions through a standard JRE ServiceLoader