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}