GzipDecodingResource.java

/*
 *  This file is part of the Wayback archival access software
 *   (http://archive-access.sourceforge.net/projects/wayback/).
 *
 *  Licensed to the Internet Archive (IA) by one or more individual 
 *  contributors. 
 *
 *  The IA 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.
 */

/** 
 * 
 * Provide a wrapper for a Resource that is gzip encoded, that is,
 * Resources that have the header:
 * Content-Type: gzip
 * 
 * Used by TextReplayRenderers and other ReplayRenderers that add content to the resulting output
 * 
 */

package org.archive.wayback.replay;

import java.io.IOException;
import java.util.Map;
import java.util.zip.GZIPInputStream;

import org.archive.wayback.core.Resource;

public class GzipDecodingResource extends Resource {
	
	public static final String GZIP = "gzip";
	
	private Resource source;
	
	public GzipDecodingResource(Resource source)
	{
		this.source = source;
	
		try {
			this.setInputStream(new GZIPInputStream(source));
		} catch (IOException io) {
			// If can't read as gzip, might as well as send back raw data.
			this.setInputStream(source);
		}
	}

	@Override
	public long getRecordLength() {
		return source.getRecordLength();
	}

	@Override
	public Map<String, String> getHttpHeaders() {
		return source.getHttpHeaders();
	}

	@Override
	public void close() throws IOException {
		source.close();		
	}

	@Override
	public int getStatusCode() {
		return source.getStatusCode();
	}

	@Override
	public String getRefersToTargetURI() {
		return source.getRefersToTargetURI();
	}

	@Override
	public String getRefersToDate() {
		return source.getRefersToDate();
	}
}