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 'action' property of RunData based
034 * on request parameter. There is no default action, since a null action is
035 * perfectly valid.
036 *
037 * @author <a href="mailto:james@jamestaylor.org">James Taylor</a>
038 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
039 */
040 public class DetermineActionValve
041 extends AbstractValve
042 {
043 private static final Log log
044 = LogFactory.getLog(DetermineActionValve.class);
045
046 /**
047 * @see org.apache.turbine.Valve#invoke(RunData, ValveContext)
048 */
049 public void invoke(PipelineData pipelineData, ValveContext context)
050 throws IOException, TurbineException
051 {
052 RunData data = getRunData(pipelineData);
053 if (! data.hasAction())
054 {
055 String action =
056 data.getParameters().getString(URIConstants.CGI_ACTION_PARAM);
057
058 if (action != null)
059 {
060 data.setAction(action);
061
062 log.debug("Set action from request parameter");
063 }
064 else
065 {
066 log.debug("No action");
067 }
068 }
069
070 if (log.isDebugEnabled())
071 {
072 log.debug("Action is now: " + data.getAction());
073 }
074
075 // Pass control to the next Valve in the Pipeline
076 context.invokeNext(pipelineData);
077 }
078 }