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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.qpid.restapi.httpserver;
import java.io.IOException;
import static java.net.HttpURLConnection.HTTP_BAD_METHOD;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import org.apache.qpid.restapi.HttpTransaction;
import org.apache.qpid.restapi.Server;
/**
* Delegator is an implementation of com.sun.net.httpserver.HttpHandler that is used to delegate to Server objects
* and thus provide an abstraction between the Web Server implementation (e.g. HttpServer or Servlets) and the
* implementation neutral Server and HttpTransaction interfaces.
* <p>
* In order to replace the HttpServer implementation with a Servlet based implementation all that should be necessary
* is a concrete implementation of HttpTransaction that wraps HttpServletRequest and HttpServletResponse and subclasses
* of HttpServlet that delegate to the appropriate Server instances from the appropriate context in a similar way
* to the Delegator class here.
*
* @author Fraser Adams
*/
public class Delegator implements HttpHandler
{
private final Server _server;
/**
* Construct a Delegator instance that delegates to the specified Server instance.
* @param server the Server instance that this Delegator delegates to.
*/
public Delegator(Server server)
{
_server = server;
}
/**
* Implements the HttpHandler handle interface and delegates to the Server instance.
* @param exchange the HttpExchange exchange object passed by the HttpServer. This will be used to construct
* an HttpTransaction instance that will be passed to the Server.
*/
public void handle(final HttpExchange exchange) throws IOException
{
HttpTransaction tx = new HttpExchangeTransaction(exchange);
String method = tx.getMethod();
if (method.equals("GET"))
{
_server.doGet(tx);
}
else if (method.equals("POST"))
{
_server.doPost(tx);
}
else if (method.equals("PUT"))
{
_server.doPut(tx);
}
else if (method.equals("DELETE"))
{
_server.doDelete(tx);
}
else
{
tx.sendResponse(HTTP_BAD_METHOD, "text/plain", "405 Bad Method.");
}
}
}
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