2009/05/20 - Apache Shale has been retired.

For more information, please explore the Attic.


1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to you under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  /*
19   * $Id: AssignConverterCommand.java 464373 2006-10-16 04:21:54Z rahul $
20   */
21  package org.apache.shale.clay.component.chain;
22  
23  import javax.faces.component.UIComponent;
24  import javax.faces.component.ValueHolder;
25  
26  import org.apache.commons.chain.Catalog;
27  import org.apache.commons.chain.Command;
28  import org.apache.commons.chain.Context;
29  import org.apache.commons.logging.Log;
30  import org.apache.commons.logging.LogFactory;
31  import org.apache.shale.clay.config.Globals;
32  import org.apache.shale.clay.config.beans.ComponentBean;
33  
34  /***
35   * <p>
36   * Determines if the {@link ComponentBean} has a {@link org.apache.shale.clay.config.beans.ConverterBean} assigned.
37   * A <code>Converter</code> is created by invoking the
38   * {@link org.apache.shale.clay.component.chain.CreateConverterCommand}.
39   * </p>
40   */
41  public class AssignConverterCommand extends AbstractCommand {
42  
43      /***
44       * <p>
45       * Common Logging utility.
46       * </p>
47       */
48      private static Log log;
49      static {
50          log = LogFactory.getLog(AssignConverterCommand.class);
51      }
52  
53      /***
54       * <p>
55       * Checks to see if the {@link org.apache.shale.clay.config.beans.ComponentBean}
56       * has a {@link org.apache.shale.clay.config.beans.ConverterBean}
57       * assigned. The <code>Globals.ADD_CONVERTER_COMMAND_NAME</code> is
58       * invoked to create a <code>Converter</code>.
59       *
60       * @param context common chains
61       * @return <code>true</code> if the chain is complete
62       * @exception Exception propagated up to the top of the chain
63       */
64      public boolean execute(Context context) throws Exception {
65  
66          boolean isFinal = false;
67  
68          ClayContext clayContext = (ClayContext) context;
69          if (clayContext == null) {
70              throw new NullPointerException(getMessages()
71                      .getMessage("clay.null.clayContext"));
72          }
73  
74          UIComponent child = (UIComponent) clayContext.getChild();
75          if (child == null) {
76              throw new NullPointerException(getMessages()
77                      .getMessage("clay.null.childComponent"));
78          }
79  
80          ComponentBean displayElement = clayContext.getDisplayElement();
81          if (displayElement == null) {
82              throw new NullPointerException(getMessages()
83                      .getMessage("clay.null.componentBean"));
84          }
85  
86          if (displayElement.getConverter() != null) {
87              if (child instanceof ValueHolder) {
88  
89                  ClayContext subContext = (ClayContext) clayContext.clone();
90                  subContext.setDisplayElement(displayElement.getConverter());
91                  subContext.setParent(child);
92  
93                  Catalog catalog = getCatalog();
94                  Command command = catalog
95                          .getCommand(Globals.ADD_CONVERTER_COMMAND_NAME);
96                  command.execute(subContext);
97  
98              } else {
99                  log.error(getMessages().getMessage("assign.converter.error",
100                         new Object[] { displayElement }));
101             }
102         }
103 
104         return isFinal;
105     }
106 
107 }