    001package org.apache.turbine.services.jsp.util;
    002
    003
    004/*
    005 * Licensed to the Apache Software Foundation (ASF) under one
    006 * or more contributor license agreements.  See the NOTICE file
    007 * distributed with this work for additional information
    008 * regarding copyright ownership.  The ASF licenses this file
    009 * to you under the Apache License, Version 2.0 (the
    010 * "License"); you may not use this file except in compliance
    011 * with the License.  You may obtain a copy of the License at
    012 *
    013 *   http://www.apache.org/licenses/LICENSE-2.0
    014 *
    015 * Unless required by applicable law or agreed to in writing,
    016 * software distributed under the License is distributed on an
    017 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    018 * KIND, either express or implied.  See the License for the
    019 * specific language governing permissions and limitations
    020 * under the License.
    021 */
    022
    023
    024import org.apache.commons.logging.Log;
    025import org.apache.commons.logging.LogFactory;
    026import org.apache.turbine.modules.Screen;
    027import org.apache.turbine.modules.ScreenLoader;
    028import org.apache.turbine.services.TurbineServices;
    029import org.apache.turbine.services.assemblerbroker.AssemblerBrokerService;
    030import org.apache.turbine.services.template.TemplateService;
    031import org.apache.turbine.util.RunData;
    032
    033/**
    034 * Returns output of a Screen module. An instance of this is placed in the
    035 * request by the JspLayout. This allows template authors to
    036 * place the screen template within the layout.<br>
    037 * Here's how it's used in a JSP template:<br>
    038 * <code>
    039 * &lt;%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request" %&gt;
    040 * ...
    041 * &lt;%= screen_placeholder %&gt;
    042 * </code>
    043 *
    044 * @author <a href="john.mcnally@clearink.com">John D. McNally</a>
    045 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    046 * @version $Id: JspScreenPlaceholder.java 1773378 2016-12-09 13:19:59Z tv $
    047 */
    048public class JspScreenPlaceholder
    049{
    050    /** Logging */
    051    private static Log log = LogFactory.getLog(JspNavigation.class);
    052
    053    /* The RunData object */
    054    private final RunData data;
    055
    056    private final ScreenLoader screenLoader;
    057
    058    /**
    059     * Constructor
    060     *
    061     * @param data A Rundata Object
    062     */
    063    public JspScreenPlaceholder(RunData data)
    064    {
    065        this.data = data;
    066        AssemblerBrokerService abs = (AssemblerBrokerService)TurbineServices.getInstance()
    067            .getService(AssemblerBrokerService.SERVICE_NAME);
    068        this.screenLoader = (ScreenLoader)abs.getLoader(Screen.class);
    069    }
    070
    071    /**
    072     * builds the output of the navigation template
    073     */
    074    public void exec()
    075    {
    076        String template = null;
    077        String module = null;
    078        try
    079        {
    080            template = data.getTemplateInfo().getScreenTemplate();
    081            TemplateService templateService = (TemplateService)TurbineServices.getInstance().getService(TemplateService.SERVICE_NAME);
    082            module = templateService.getScreenName(template);
    083            screenLoader.exec(data, module);
    084        }
    085        catch (Exception e)
    086        {
    087            String message = "Error processing navigation template:" +
    088                    template + " using module: " + module;
    089            log.error(message, e);
    090            try
    091            {
    092                data.getResponse().getWriter().print("Error processing navigation template: "
    093                        + template + " using module: " + module);
    094            }
    095            catch (java.io.IOException ioe)
    096            {
    097                // ignore
    098            }
    099        }
    100    }
    101}