    001package org.apache.turbine.modules.screens;
    002
    003/*
    004 * Licensed to the Apache Software Foundation (ASF) under one
    005 * or more contributor license agreements.  See the NOTICE file
    006 * distributed with this work for additional information
    007 * regarding copyright ownership.  The ASF licenses this file
    008 * to you under the Apache License, Version 2.0 (the
    009 * "License"); you may not use this file except in compliance
    010 * with the License.  You may obtain a copy of the License at
    011 *
    012 *   http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing,
    015 * software distributed under the License is distributed on an
    016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    017 * KIND, either express or implied.  See the License for the
    018 * specific language governing permissions and limitations
    019 * under the License.
    020 */
    021
    022import org.apache.commons.lang.StringUtils;
    023import org.apache.turbine.annotation.TurbineService;
    024import org.apache.turbine.pipeline.PipelineData;
    025import org.apache.turbine.services.jsp.JspService;
    026import org.apache.turbine.services.template.TemplateService;
    027import org.apache.turbine.util.RunData;
    028
    029/**
    030 * Base JSP Screen that should be subclassed by screens that want to
    031 * use JSP.  Subclasses should override the doBuildTemplate() method.
    032 *
    033 * @author <a href="mailto:john.mcnally@clearink.com">John D. McNally</a>
    034 * @author Frank Y. Kim
    035 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    036 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
    037 * @version $Id: BaseJspScreen.java 1773378 2016-12-09 13:19:59Z tv $
    038 */
    039public class BaseJspScreen
    040        extends TemplateScreen
    041{
    042    /** The prefix for lookup up screen pages */
    043    private String prefix = getPrefix() + "/";
    044
    045    /** Injected service instance */
    046    @TurbineService
    047    private JspService jspService;
    048
    049    /** Injected service instance */
    050    @TurbineService
    051    private TemplateService templateService;
    052
    053    /**
    054     * Method that sets up beans and forward the request to the JSP.
    055     *
    056     * @param pipelineData Turbine information.
    057     * @return null - the JSP sends the information.
    058     * @throws Exception a generic exception.
    059     */
    060    @Override
    061    public String buildTemplate(PipelineData pipelineData)
    062            throws Exception
    063    {
    064        RunData data = getRunData(pipelineData);
    065        String screenTemplate = data.getTemplateInfo().getScreenTemplate();
    066        // get the name of the template we want to use
    067        String templateName
    068            = templateService.getScreenTemplateName(screenTemplate);
    069
    070        // The Template Service could not find the Screen
    071        if (StringUtils.isEmpty(templateName))
    072        {
    073            log.error("Screen " + screenTemplate + " not found!");
    074            throw new Exception("Could not find screen for " + screenTemplate);
    075        }
    076
    077        // let service know whether we are using a layout
    078        jspService.handleRequest(pipelineData, prefix + templateName,
    079                                 getLayout(pipelineData) == null);
    080
    081        return null;
    082    }
    083
    084    /**
    085     * Method to be overridden by subclasses to include data in beans, etc.
    086     *
    087     * @param pipelineData the PipelineData object
    088     * @throws Exception a generic exception.
    089     */
    090    @Override
    091    protected void doBuildTemplate(PipelineData pipelineData)
    092        throws Exception
    093    {
    094        // abstract method
    095    }
    096}