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Java > Open Source Codes > org > apache > tapestry > pageload > ComponentTreeWalker


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.pageload;
16
17 import java.util.Collection JavaDoc;
18 import java.util.Iterator JavaDoc;
19
20 import org.apache.tapestry.IComponent;
21 import org.apache.tapestry.Tapestry;
22
23 /**
24  * Walks through the tree of components and invokes the visitors on each of
25  * of the components in the tree.
26  *
27  * @author mindbridge
28  * @since 3.0
29  */
30 public class ComponentTreeWalker
31 {
32     private IComponentVisitor[] _visitors;
33     
34     public ComponentTreeWalker(IComponentVisitor[] visitors)
35     {
36         _visitors = visitors;
37     }
38
39     public void walkComponentTree(IComponent component)
40     {
41         // Invoke visitors
42 for (int i = 0; i < _visitors.length; i++)
43         {
44             IComponentVisitor visitor = _visitors[i];
45             visitor.visitComponent(component);
46         }
47
48         // Recurse into the embedded components
49 Collection JavaDoc components = component.getComponents().values();
50
51         if (Tapestry.size(components) == 0)
52             return;
53
54         for (Iterator JavaDoc it = components.iterator(); it.hasNext();)
55         {
56             IComponent embedded = (IComponent) it.next();
57             walkComponentTree(embedded);
58         }
59     }
60 }
61
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