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


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 java.util.Iterator JavaDoc;
19 import java.util.LinkedList JavaDoc;
20 import java.util.Locale JavaDoc;
21
22 import org.apache.avalon.framework.logger.Logger;
23 import org.apache.cocoon.woody.datatype.convertor.Convertor;
24 import org.apache.cocoon.woody.formmodel.Widget;
25 import org.apache.commons.jxpath.JXPathContext;
26 import org.apache.commons.jxpath.Pointer;
27
28 /**
29  * Simple binding for multi fields: on save, first deletes the target data
30  * before recreating it from scratch.
31  *
32  * @version CVS $Id: MultiValueJXPathBinding.java 30932 2004-07-29 17:35:38Z vgritsenko $
33  */
34 public class MultiValueJXPathBinding extends JXPathBindingBase {
35
36     private final String JavaDoc multiValueId;
37     private final String JavaDoc multiValuePath;
38     private final String JavaDoc rowPath;
39     private final JXPathBindingBase updateBinding;
40     private final Convertor convertor;
41     private final Locale JavaDoc convertorLocale;
42
43     public MultiValueJXPathBinding(
44         JXPathBindingBuilderBase.CommonAttributes commonAtts, String JavaDoc multiValueId,
45         String JavaDoc multiValuePath, String JavaDoc rowPath,
46         JXPathBindingBase[] updateBindings, Convertor convertor, Locale JavaDoc convertorLocale) {
47         super(commonAtts);
48         this.multiValueId = multiValueId;
49         this.multiValuePath = multiValuePath;
50         this.rowPath = rowPath;
51         this.updateBinding = new ComposedJXPathBindingBase(JXPathBindingBuilderBase.CommonAttributes.DEFAULT, updateBindings);
52         this.convertor = convertor;
53         this.convertorLocale = convertorLocale;
54     }
55
56     public void doLoad(Widget frmModel, JXPathContext jctx) throws BindingException {
57         Widget widget = frmModel.getWidget(this.multiValueId);
58         if (widget == null) {
59             throw new BindingException("The widget with the ID [" + this.multiValueId
60                     + "] referenced in the binding does not exist in the form definition.");
61         }
62
63         // Move to multi value context
64 Pointer ptr = jctx.getPointer(this.multiValuePath);
65         if (ptr.getNode() != null) {
66             // There are some nodes to load from
67
68             JXPathContext multiValueContext = jctx.getRelativeContext(ptr);
69             // build a jxpath iterator for pointers
70 Iterator JavaDoc rowPointers = multiValueContext.iterate(this.rowPath);
71
72             LinkedList JavaDoc list = new LinkedList JavaDoc();
73
74             while (rowPointers.hasNext()) {
75                 Object JavaDoc value = rowPointers.next();
76
77                 if (value != null && convertor != null) {
78                     if (value instanceof String JavaDoc) {
79                         value = convertor.convertFromString((String JavaDoc)value, convertorLocale, null);
80                     } else {
81                         getLogger().warn("Convertor ignored on backend-value which isn't of type String.");
82                     }
83                 }
84
85                 list.add(value);
86             }
87
88             widget.setValue(list.toArray());
89         }
90
91         if (getLogger().isDebugEnabled())
92             getLogger().debug("done loading values " + toString());
93     }
94
95     public void doSave(Widget frmModel, JXPathContext jctx) throws BindingException {
96         Widget widget = frmModel.getWidget(this.multiValueId);
97         Object JavaDoc[] values = (Object JavaDoc[])widget.getValue();
98
99         JXPathContext multiValueContext = jctx.getRelativeContext(jctx.createPath(this.multiValuePath));
100         // Delete all that is already present
101 multiValueContext.removeAll(this.rowPath);
102
103         boolean update = false;
104
105         if (values != null) {
106             // first update the values
107 for (int i = 0; i < values.length; i++) {
108                 String JavaDoc path = this.rowPath + '[' + (i+1) + ']';
109                 Pointer rowPtr = multiValueContext.createPath(path);
110
111                 Object JavaDoc value = values[i];
112                 if (value != null && convertor != null) {
113                     value = convertor.convertToString(value, convertorLocale, null);
114                 }
115
116                 rowPtr.setValue(value);
117             }
118
119             // now perform any other bindings that need to be performed when the value is updated
120 this.updateBinding.saveFormToModel(frmModel, multiValueContext);
121
122             update = true;
123         }
124
125
126         if (getLogger().isDebugEnabled()) {
127             getLogger().debug("done saving " + toString() + " -- on-update == " + update);
128         }
129
130
131
132     }
133
134     public String JavaDoc toString() {
135         return "MultiValueJXPathBinding [widget=" + this.multiValueId + ", xpath=" + this.multiValuePath + "]";
136     }
137
138     public void enableLogging(Logger logger) {
139         super.enableLogging(logger);
140         this.updateBinding.enableLogging(logger);
141     }
142 }
143
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