com.cyclopsgroup.waterview.jsp.JspEngine.java Source code

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Here is the source code for com.cyclopsgroup.waterview.jsp.JspEngine.java

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/* ==========================================================================
 * Copyright 2002-2005 Cyclops Group Community
 * 
 * Licensed under the Open Software License, Version 2.1 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://opensource.org/licenses/osl-2.1.php
 *
 *  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 com.cyclopsgroup.waterview.jsp;

import java.io.File;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.commons.lang.StringUtils;

import com.cyclopsgroup.waterview.Context;
import com.cyclopsgroup.waterview.Path;
import com.cyclopsgroup.waterview.RuntimeData;
import com.cyclopsgroup.waterview.spi.DynaViewFactory;
import com.cyclopsgroup.waterview.spi.ModuleService;
import com.cyclopsgroup.waterview.spi.View;

/**
 * @author <a href="mailto:jiaqi.guo@gmail.com">Jiaqi Guo</a>
 *
 * JSP engine
 */
public class JspEngine extends AbstractLogEnabled implements Serviceable, DynaViewFactory {
    /** Role name of this component */
    public static final String ROLE = JspEngine.class.getName();

    /**
     * Overwrite or implement method createView()
     *
     * @see com.cyclopsgroup.waterview.spi.DynaViewFactory#createView(com.cyclopsgroup.waterview.Path)
     */
    public View createView(Path path) throws Exception {
        String p = path.getPath();
        if (StringUtils.isNotEmpty(path.getPackage())) {
            p = '/' + StringUtils.replace(path.getPackage(), ".", "/") + p;
        }
        p = "/templates" + p;
        return new JspView(p, path.getFullPath());
    }

    /**
     * @param path Absolute JSP path
     * @param data Runtime data
     * @param viewContext View context
     * @throws Exception Throw it out
     */
    public void renderJsp(String path, RuntimeData data, Context viewContext) throws Exception {
        HttpServletRequest request = (HttpServletRequest) data.getRequestContext().get("request");
        HttpServletResponse response = (HttpServletResponse) data.getRequestContext().get("response");
        ServletContext servletContext = (ServletContext) data.getRequestContext().get("servletContext");
        if (request == null || response == null || servletContext == null) {
            data.getOutput().println("Jsp " + path + " is not rendered correctly with request " + request
                    + ", response " + response + ", context " + servletContext);
        }
        request.setAttribute("viewContext", viewContext);
        RequestDispatcher dispatcher = servletContext.getRequestDispatcher(path);
        File jspFile = new File(servletContext.getRealPath(path));
        if (dispatcher == null || !jspFile.isFile()) {
            data.getOutput().println("Jsp " + path + " doesn't exist");
        } else {
            dispatcher.include(request, response);
            response.getWriter().flush();
        }
        request.removeAttribute("viewContext");
    }

    /**
     * Overwrite or implement method service()
     * @see org.apache.avalon.framework.service.Serviceable#service(org.apache.avalon.framework.service.ServiceManager)
     */
    public void service(ServiceManager serviceManager) throws ServiceException {
        ModuleService moduleManager = (ModuleService) serviceManager.lookup(ModuleService.ROLE);
        moduleManager.registerDynaViewFactory(".+\\.jsp", this);
    }
}