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: OptionBuilderRule.java 464373 2006-10-16 04:21:54Z rahul $
20   */
21  package org.apache.shale.clay.parser.builder.chain;
22  
23  import org.apache.commons.chain.Command;
24  import org.apache.commons.chain.Context;
25  import org.apache.shale.clay.parser.Node;
26  import org.apache.shale.clay.parser.builder.Builder;
27  import org.apache.shale.clay.parser.builder.SelectItemBuilder;
28  import org.apache.shale.clay.parser.builder.SelectItemsBuilder;
29  
30  /***
31   * <p>
32   * This <code>Command</code> will return either a {@link SelectItemBuilder} or
33   * a {@link SelectItemsBuilder} if the html {@link Node} is an option and the
34   * option has children.
35   * </p>
36   */
37  public class OptionBuilderRule implements Command {
38  
39      /***
40       * <p>
41       * Array of {@link Builder}s.
42       * </p>
43       */
44      private static final Builder[] BUILDERS = { new SelectItemBuilder(), new SelectItemsBuilder() };
45  
46      /***
47       * <p>Returns a <code>true</code> value if the current html {@link Node} is
48       * an option. A <code>true</code> result means that a rule has been
49       * assigned to the {@link BuilderRuleContext}.
50       * <p>
51       *
52       * @param context chains context
53       * @return <code>true</code> if the chain is done
54       * @exception Exception up the calling chain
55       */
56      public boolean execute(Context context) throws Exception {
57          boolean isFinal = false;
58  
59          BuilderRuleContext builderRuleContext = (BuilderRuleContext) context;
60          Node node = builderRuleContext.getNode();
61          if (!node.isComment() && node.getName() != null
62              && node.getName().equalsIgnoreCase("option")) {
63  
64              if (node.getChildren().size() > 0) {
65                  builderRuleContext.setBuilder(BUILDERS[0]);
66                  isFinal = true;
67              } else {
68                  // no value attribute, must be bound to a component
69                  builderRuleContext.setBuilder(BUILDERS[1]);
70                  isFinal = true;
71              }
72  
73          }
74  
75          return isFinal;
76      }
77  
78  }