    001    package 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
    024    import org.apache.commons.logging.Log;
    025    import org.apache.commons.logging.LogFactory;
    026    import org.apache.turbine.modules.Screen;
    027    import org.apache.turbine.modules.ScreenLoader;
    028    import org.apache.turbine.services.assemblerbroker.TurbineAssemblerBroker;
    029    import org.apache.turbine.services.template.TurbineTemplate;
    030    import org.apache.turbine.util.RunData;
    031
    032    /**
    033     * Returns output of a Screen module. An instance of this is placed in the
    034     * request by the JspLayout. This allows template authors to
    035     * place the screen template within the layout.<br>
    036     * Here's how it's used in a JSP template:<br>
    037     * <code>
    038     * <%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request"/%>
    039     * ...
    040     * <%= screen_placeholder %>
    041     *</code>
    042     *
    043     * @author <a href="john.mcnally@clearink.com">John D. McNally</a>
    044     * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    045     * @version $Id: JspScreenPlaceholder.java 757213 2009-03-22 16:43:31Z tv $
    046     */
    047    public class JspScreenPlaceholder
    048    {
    049        /** Logging */
    050        private static Log log = LogFactory.getLog(JspNavigation.class);
    051
    052        /* The RunData object */
    053        private RunData data;
    054
    055        private ScreenLoader screenLoader;
    056
    057        /**
    058         * Constructor
    059         *
    060         * @param data A Rundata Object
    061         */
    062        public JspScreenPlaceholder(RunData data)
    063        {
    064            this.data = data;
    065            this.screenLoader = (ScreenLoader)TurbineAssemblerBroker.getLoader(Screen.NAME);
    066        }
    067
    068        /**
    069         * builds the output of the navigation template
    070         */
    071        public void exec()
    072        {
    073            String template = null;
    074            String module = null;
    075            try
    076            {
    077                template = data.getTemplateInfo().getScreenTemplate();
    078                module = TurbineTemplate.getScreenName(template);
    079                screenLoader.exec(data, module);
    080            }
    081            catch (Exception e)
    082            {
    083                String message = "Error processing navigation template:" +
    084                        template + " using module: " + module;
    085                log.error(message, e);
    086                try
    087                {
    088                    data.getResponse().getWriter().print("Error processing navigation template: "
    089                            + template + " using module: " + module);
    090                }
    091                catch (java.io.IOException ioe)
    092                {
    093                    // ignore
    094                }
    095            }
    096        }
    097    }