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Java > Open Source Codes > org > apache > cocoon > woody > binding > ContextJXPathBindingBuilder


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.woody.binding;
17
18 import org.apache.cocoon.woody.util.DomHelper;
19 import org.w3c.dom.Element JavaDoc;
20
21 /**
22  * ContextJXPathBindingBuilder provides a helper class for the Factory
23  * implemented in {@link JXPathBindingManager} that helps construct the
24  * actual {@link ContextJXPathBinding} out of the configuration in the
25  * provided configElement which looks like:
26  * <pre><code>
27  * &lt;wb:context path="<i>xpath expression</i>"&gt;
28  * &lt;!-- in here come the nested child bindings on the sub-context --&gt;
29  * &lt;/wb:context&gt;
30  * </code></pre>
31  *
32  * @version CVS $Id: ContextJXPathBindingBuilder.java 30932 2004-07-29 17:35:38Z vgritsenko $
33  */
34 public class ContextJXPathBindingBuilder extends JXPathBindingBuilderBase {
35
36     /**
37      * Creates an instance of ContextJXPathBinding with the configured
38      * path and nested child bindings from the declarations in the bindingElm
39      */
40     public JXPathBindingBase buildBinding(Element JavaDoc bindingElm,
41         JXPathBindingManager.Assistant assistant) throws BindingException {
42
43         try {
44             CommonAttributes commonAtts = JXPathBindingBuilderBase.getCommonAttributes(bindingElm);
45             String JavaDoc xpath = DomHelper.getAttribute(bindingElm, "path");
46
47             JXPathBindingBase[] childBindings = assistant.makeChildBindings(bindingElm);
48
49             ContextJXPathBinding contextBinding = new ContextJXPathBinding(commonAtts, xpath, childBindings);
50             return contextBinding;
51         } catch (BindingException e) {
52             throw e;
53         } catch (Exception JavaDoc e) {
54             throw new BindingException("Error building context binding defined at " + DomHelper.getLocation(bindingElm), e);
55         }
56     }
57 }
58
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