/*
* 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.ant.types.resources;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.tools.bzip2.CBZip2InputStream;
import org.apache.tools.bzip2.CBZip2OutputStream;
/**
* A Bzip2 compressed resource.
*
* <p>Wraps around another resource, delegates all quries to that
* other resource but uncompresses/compresses streams on the fly.</p>
*
* @since Ant 1.7
*/
public class BZip2Resource extends CompressedResource {
private static final char[] MAGIC = new char[] {'B', 'Z'};
/** A no-arg constructor */
public BZip2Resource() {
}
/**
* Constructor with another resource to wrap.
* @param other the resource to wrap.
*/
public BZip2Resource(org.apache.tools.ant.types.ResourceCollection other) {
super(other);
}
/**
* Decompress on the fly using {@link CBZip2InputStream}.
* @param in the stream to wrap.
* @return the wrapped stream.
* @throws IOException if there is a problem.
*/
protected InputStream wrapStream(InputStream in) throws IOException {
for (int i = 0; i < MAGIC.length; i++) {
if (in.read() != MAGIC[i]) {
throw new IOException("Invalid bz2 stream.");
}
}
return new CBZip2InputStream(in);
}
/**
* Compress on the fly using {@link CBZip2OutputStream}.
* @param out the stream to wrap.
* @return the wrapped stream.
* @throws IOException if there is a problem.
*/
protected OutputStream wrapStream(OutputStream out) throws IOException {
for (int i = 0; i < MAGIC.length; i++) {
out.write(MAGIC[i]);
}
return new CBZip2OutputStream(out);
}
/**
* Get the name of the compression method.
* @return the string "Bzip2".
*/
protected String getCompressionName() {
return "Bzip2";
}
}