facescontrollerhandleradapter.java

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/*
 * Copyright 2002-2004 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 de.mindmatters.faces.spring.context.servlet;

import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.util.Assert;
import org.springframework.web.servlet.HandlerAdapter;
import org.springframework.web.servlet.ModelAndView;

/**
 * Adapter to use the {@link FacesController} workflow class with the generic
 * {@link FacesDispatcherServlet}.
 * 
 * <p>
 * This is an SPI class, not used directly by application code. It's already
 * enabled on deployment of <em>jsf-spring.jar</em>.
 * 
 * @author Andreas Kuhrwahl
 * 
 */
public final class FacesControllerHandlerAdapter implements HandlerAdapter {

    /**
     * {@inheritDoc}
     */
    public boolean supports(final Object handler) {
        return (handler instanceof FacesController);
    }

    /**
     * {@inheritDoc}
     */
    public long getLastModified(final HttpServletRequest request,
            final Object handler) {
        return -1L;
    }

    /**
     * {@inheritDoc}
     */
    public ModelAndView handle(final HttpServletRequest request,
            final HttpServletResponse response, final Object handler)
            throws Exception {
        FacesContext context = FacesContext.getCurrentInstance();
        Assert.notNull(context);
        try {
            LifecycleExecutor.bindHandler(context, handler);
            return ((FacesController) handler).handleRequest(request, response);
        } catch (Exception ex) {
            LifecycleExecutor.unbindHandler(context);
            throw ex;
        }
    }

}