/*
 * Copyright 2002-2006 the original author or authors.
 *
 * Licensed 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.springframework.web.portlet.handler;

import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.Portlet;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;

import org.springframework.web.portlet.HandlerAdapter;
import org.springframework.web.portlet.ModelAndView;

/**
 * Adapter to use the Portlet interface with the generic DispatcherPortlet.
 * Calls the Portlet's <code>render</code> and <code>processAction</code>
 * methods to handle a request.
 *
 * <p>This adapter is not activated by default; it needs to be defined as a
 * bean in the DispatcherPortlet context. It will automatically apply to
 * mapped handler beans that implement the Portlet interface then.
 *
 * <p>Note that Portlet instances defined as bean will not receive initialization
 * and destruction callbacks, unless a special post-processor such as
 * SimplePortletPostProcessor is defined in the DispatcherPortlet context.
 *
 * <p><b>Alternatively, consider wrapping a Portlet with Spring's
 * PortletWrappingController.</b> This is particularly appropriate for
 * existing Portlet classes, allowing to specify Portlet initialization
 * parameters, etc.
 *
 * @author John A. Lewis
 * @since 2.0
 * @see javax.portlet.Portlet
 * @see SimplePortletPostProcessor
 * @see org.springframework.web.portlet.mvc.PortletWrappingController
 */
public class SimplePortletHandlerAdapter implements HandlerAdapter {
	
	public boolean supports(Object handler) {
		return (handler instanceof Portlet);
	}

	public void handleAction(ActionRequest request, ActionResponse response, Object handler)
			throws Exception {

		((Portlet) handler).processAction(request, response);
	}

	public ModelAndView handleRender(RenderRequest request, RenderResponse response, Object handler)
			throws Exception {

		((Portlet) handler).render(request, response);
		return null;
	}

}