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Java > Open Source Codes > org > apache > cocoon > components > treeprocessor > ContainerNodeBuilder


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.cocoon.components.treeprocessor;
17
18 import org.apache.avalon.framework.configuration.Configuration;
19 import org.apache.avalon.framework.configuration.ConfigurationException;
20 import org.apache.avalon.framework.thread.ThreadSafe;
21
22 /**
23  * Builds a generic container node.
24  *
25  * @author <a HREF="mailto:sylvain@apache.org">Sylvain Wallez</a>
26  * @version CVS $Id: ContainerNodeBuilder.java 30932 2004-07-29 17:35:38Z vgritsenko $
27  */
28
29 public class ContainerNodeBuilder extends AbstractParentProcessingNodeBuilder implements ThreadSafe {
30
31     /** This builder has no parameters -- return <code>false</code> */
32     protected boolean hasParameters() {
33         return false;
34     }
35
36     public ProcessingNode buildNode(Configuration config) throws Exception JavaDoc {
37
38         ContainerNode node = new ContainerNode();
39         setupNode(node, config);
40
41         return node;
42     }
43
44     protected void setupNode(ContainerNode node, Configuration config)throws Exception JavaDoc {
45
46         this.treeBuilder.setupNode(node, config);
47
48         ProcessingNode[] children = buildChildNodes(config);
49         if (children.length == 0) {
50             String JavaDoc msg = "There must be at least one child at " + config.getLocation();
51             throw new ConfigurationException(msg);
52         }
53
54         node.setChildren(children);
55     }
56 }
57
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