/*
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.localserver;

import java.io.IOException;
import java.util.Locale;

import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.MethodNotSupportedException;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpRequestHandler;
import org.apache.http.util.EntityUtils;

/**
 * A handler that echos the incoming request entity.
 * 
 * 
 * 
 * <!-- empty lines to avoid 'svn diff' problems -->
 */
public class EchoHandler implements HttpRequestHandler
{
	// public default constructor

	/**
	 * Handles a request by echoing the incoming request entity. If there is no
	 * request entity, an empty document is returned.
	 * 
	 * @param request
	 *           the request
	 * @param response
	 *           the response
	 * @param context
	 *           the context
	 * 
	 * @throws HttpException
	 *            in case of a problem
	 * @throws IOException
	 *            in case of an IO problem
	 */
	public void handle( final HttpRequest request, final HttpResponse response, final HttpContext context )
			throws HttpException, IOException
	{

		String method = request.getRequestLine().getMethod().toUpperCase( Locale.ENGLISH );
		if( !"GET".equals( method ) && !"POST".equals( method ) && !"PUT".equals( method ) )
		{
			throw new MethodNotSupportedException( method + " not supported by " + getClass().getName() );
		}

		HttpEntity entity = null;
		if( request instanceof HttpEntityEnclosingRequest )
			entity = ( ( HttpEntityEnclosingRequest )request ).getEntity();

		// For some reason, just putting the incoming entity into
		// the response will not work. We have to buffer the message.
		byte[] data;
		if( entity == null )
		{
			data = new byte[0];
		}
		else
		{
			data = EntityUtils.toByteArray( entity );
		}

		ByteArrayEntity bae = new ByteArrayEntity( data );
		if( entity != null )
		{
			bae.setContentType( entity.getContentType() );
		}
		entity = bae;

		response.setStatusCode( HttpStatus.SC_OK );
		response.setEntity( entity );

	} // handle

} // class EchoHandler
