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Java > Open Source Codes > org > apache > cocoon > forms > binding > AggregateJXPathBindingBuilder


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.forms.binding;
17
18 import org.apache.cocoon.forms.util.DomHelper;
19 import org.w3c.dom.Element JavaDoc;
20
21 /**
22  * AggregateJXPathBindingBuilder provides a helper class for the Factory
23  * implemented in {@link JXPathBindingManager} that helps construct the
24  * actual {@link AggregateJXPathBinding} out of the configuration in the
25  * provided configElement which looks like:
26  * <pre><code>
27  * &lt;fb:aggregate id="<i>widget-id</i>" path="<i>xpath-expression</i>"&gt;
28  * &lt;fb:field id="<i>sub-widget-id</i>" path="<i>relative-xpath</i>" />
29  * &lt;/fb:aggregate&gt;
30  * </code></pre>
31  *
32  * @version $Id: AggregateJXPathBindingBuilder.java 289538 2005-09-16 13:46:22Z sylvain $
33  */
34 public class AggregateJXPathBindingBuilder
35     extends JXPathBindingBuilderBase {
36
37     public JXPathBindingBase buildBinding(Element JavaDoc bindingElm, JXPathBindingManager.Assistant assistant)
38             throws BindingException {
39         try {
40             CommonAttributes commonAtts = JXPathBindingBuilderBase.getCommonAttributes(bindingElm);
41             String JavaDoc xpath = DomHelper.getAttribute(bindingElm, "path", null);
42             String JavaDoc widgetId = DomHelper.getAttribute(bindingElm, "id", null);
43             
44             JXPathBindingBase[] childBindings = new JXPathBindingBase[0];
45             
46             // do inheritance
47 AggregateJXPathBinding otherBinding = (AggregateJXPathBinding)assistant.getContext().getSuperBinding();
48             if(otherBinding!=null) {
49                 childBindings = otherBinding.getChildBindings();
50                 commonAtts = JXPathBindingBuilderBase.mergeCommonAttributes(otherBinding.getCommonAtts(),commonAtts);
51                 
52                 if(xpath==null)
53                     xpath = otherBinding.getXPath();
54                 if(widgetId==null)
55                     widgetId = otherBinding.getId();
56             }
57             
58             childBindings = assistant.makeChildBindings(bindingElm,childBindings);
59             
60
61             AggregateJXPathBinding aggregateBinding = new AggregateJXPathBinding(commonAtts, widgetId, xpath, childBindings);
62             return aggregateBinding;
63         } catch (BindingException e) {
64             throw e;
65         } catch (Exception JavaDoc e) {
66             throw new BindingException("Error building aggregate field binding defined at " + DomHelper.getLocation(bindingElm), e);
67         }
68     }
69 }
70
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