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 }