1 package org.apache.turbine.pipeline;
2
3
4 /*
5 * Licensed to the Apache Software Foundation (ASF) under one
6 * or more contributor license agreements. See the NOTICE file
7 * distributed with this work for additional information
8 * regarding copyright ownership. The ASF licenses this file
9 * to you under the Apache License, Version 2.0 (the
10 * "License"); you may not use this file except in compliance
11 * with the License. You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing,
16 * software distributed under the License is distributed on an
17 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 * KIND, either express or implied. See the License for the
19 * specific language governing permissions and limitations
20 * under the License.
21 */
22
23
24 import java.io.IOException;
25
26 import org.apache.commons.logging.Log;
27 import org.apache.commons.logging.LogFactory;
28 import org.apache.turbine.util.RunData;
29 import org.apache.turbine.util.TurbineException;
30 import org.apache.turbine.util.uri.URIConstants;
31
32 /**
33 * This valve is responsible for setting the 'target' property of the RunData.
34 * If it is not already set it attempts to get the target from the request
35 * parameter 'template'. If the parameter is not set, we use the homepage
36 * specified by the configuration property Turbine.TEMPLATE_HOMEPAGE.
37 *
38 * FIXME: The request parameter which determines the template should be
39 * configurable.
40 *
41 * @author <a href="mailto:james@jamestaylor.org">James Taylor</a>
42 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
43 */
44 public class DetermineTargetValve
45 extends AbstractValve
46 {
47 private static final Log log
48 = LogFactory.getLog(DetermineTargetValve.class);
49
50 /**
51 * @see org.apache.turbine.pipeline.Valve#invoke(PipelineData, ValveContext)
52 */
53 public void invoke(PipelineData pipelineData, ValveContext context)
54 throws IOException, TurbineException
55 {
56 RunData runData = getRunData(pipelineData);
57 if (! runData.hasScreen())
58 {
59 String target = runData.getParameters().getString(URIConstants.CGI_SCREEN_PARAM);
60
61 if (target != null)
62 {
63 runData.setScreen(target);
64
65 log.debug("Set screen target from request parameter");
66 }
67 else
68 {
69 /* data.setScreen(Turbine.getConfiguration().getString(
70 Turbine.TEMPLATE_HOMEPAGE));
71
72 log.debug("Set target using default value");
73 */
74 log.debug("No target screen");
75 }
76
77 }
78
79 if (log.isDebugEnabled())
80 {
81 log.debug("Screen Target is now: " + runData.getScreen());
82 }
83
84 // Pass control to the next Valve in the Pipeline
85 context.invokeNext(pipelineData);
86 }
87 }