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


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  * GroupJXPathBindingBuilder provides a helper class for the Factory
23  * implemented in {@link JXPathBindingManager} that helps construct the
24  * actual {@link GroupJXPathBinding} out of the configuration in the
25  * provided configElement which looks like:
26  * <pre><code>
27  * &lt;fb:group id="<i>widget-id</i>" path="<i>xpath-expression</i>"
28  * direction="<i>load|save</i>" lenient="<i>true|false</i>" &gt;
29  * &lt;fb:field id="<i>sub-widget-id</i>" path="<i>relative-xpath</i>" />
30  * &lt;/fb:group&gt;
31  * </code></pre>
32  *
33  * @version $Id$
34  */
35 public class GroupJXPathBindingBuilder
36     extends JXPathBindingBuilderBase {
37
38     public JXPathBindingBase buildBinding(Element JavaDoc bindingElm, JXPathBindingManager.Assistant assistant)
39             throws BindingException {
40         try {
41             String JavaDoc widgetId = DomHelper.getAttribute(bindingElm, "id",null);
42             CommonAttributes commonAtts = JXPathBindingBuilderBase.getCommonAttributes(bindingElm);
43             String JavaDoc xpath = DomHelper.getAttribute(bindingElm, "path",null);
44
45             JXPathBindingBase[] childBindings = new JXPathBindingBase[0];
46
47 // do inheritance
48 GroupJXPathBinding otherBinding = (GroupJXPathBinding)assistant.getContext().getSuperBinding();
49             if(otherBinding!=null) {
50                 childBindings = otherBinding.getChildBindings();
51                 commonAtts = JXPathBindingBuilderBase.mergeCommonAttributes(otherBinding.getCommonAtts(),commonAtts);
52                 
53                 if(xpath==null)
54                     xpath = otherBinding.getXPath();
55                 if(widgetId==null)
56                     widgetId = otherBinding.getId();
57             }
58             
59             childBindings = assistant.makeChildBindings(bindingElm, childBindings);
60             
61             GroupJXPathBinding groupBinding =
62                 new GroupJXPathBinding(commonAtts, widgetId, xpath, childBindings);
63             return groupBinding;
64         } catch (BindingException e) {
65             throw e;
66         } catch (Exception JavaDoc e) {
67             throw new BindingException("Error building group binding defined at " + DomHelper.getLocation(bindingElm), e);
68         }
69     }
70 }
71
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