001 package 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
024 import java.io.IOException;
025
026 import org.apache.commons.logging.Log;
027 import org.apache.commons.logging.LogFactory;
028 import org.apache.turbine.util.RunData;
029 import org.apache.turbine.util.TurbineException;
030 import 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 */
044 public class DetermineTargetValve
045 extends AbstractValve
046 {
047 private static final Log log
048 = LogFactory.getLog(DetermineTargetValve.class);
049
050 /**
051 * @see org.apache.turbine.Valve#invoke(RunData, 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 }