    001package org.apache.turbine.pipeline;
    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 java.io.IOException;
    025
    026import org.apache.commons.logging.Log;
    027import org.apache.commons.logging.LogFactory;
    028import org.apache.turbine.util.RunData;
    029import org.apache.turbine.util.TurbineException;
    030import org.apache.turbine.util.uri.URIConstants;
    031
    032/**
    033 * This valve is responsible for setting the 'target' property of the RunData.
    034 * If it is not already set it attempts to get the target from the request
    035 * parameter 'template'. If the parameter is not set, we use the homepage
    036 * specified by the configuration property Turbine.TEMPLATE_HOMEPAGE.
    037 *
    038 * FIXME: The request parameter which determines the template should be
    039 *        configurable.
    040 *
    041 * @author <a href="mailto:james@jamestaylor.org">James Taylor</a>
    042 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
    043 */
    044public class DetermineTargetValve
    045    extends AbstractValve
    046{
    047    private static final Log log
    048        = LogFactory.getLog(DetermineTargetValve.class);
    049
    050    /**
    051     * @see org.apache.turbine.pipeline.Valve#invoke(PipelineData, ValveContext)
    052     */
    053    public void invoke(PipelineData pipelineData, ValveContext context)
    054        throws IOException, TurbineException
    055    {
    056        RunData runData = getRunData(pipelineData);
    057        if (! runData.hasScreen())
    058        {
    059            String target = runData.getParameters().getString(URIConstants.CGI_SCREEN_PARAM);
    060
    061            if (target != null)
    062            {
    063                runData.setScreen(target);
    064
    065                log.debug("Set screen target from request parameter");
    066            }
    067            else
    068            {
    069            /*    data.setScreen(Turbine.getConfiguration().getString(
    070                    Turbine.TEMPLATE_HOMEPAGE));
    071
    072                log.debug("Set target using default value");
    073                */
    074                                log.debug("No target screen");
    075            }
    076
    077        }
    078
    079        if (log.isDebugEnabled())
    080        {
    081            log.debug("Screen Target is now: " + runData.getScreen());
    082        }
    083
    084        // Pass control to the next Valve in the Pipeline
    085        context.invokeNext(pipelineData);
    086    }
    087}