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Java > Open Source Codes > org > apache > commons > betwixt > strategy > DefaultActionMappingStrategy


1 /*
2  * Copyright 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  
17 package org.apache.commons.betwixt.strategy;
18
19 import org.apache.commons.betwixt.ElementDescriptor;
20 import org.apache.commons.betwixt.io.read.ArrayBindAction;
21 import org.apache.commons.betwixt.io.read.BeanBindAction;
22 import org.apache.commons.betwixt.io.read.MappingAction;
23 import org.apache.commons.betwixt.io.read.ReadContext;
24 import org.apache.commons.betwixt.io.read.SimpleTypeBindAction;
25 import org.xml.sax.Attributes JavaDoc;
26
27 /**
28  * @author <a HREF='http://jakarta.apache.org/'>Jakarta Commons Team</a>
29  * @version $Revision: 1.2 $
30  */
31 public class DefaultActionMappingStrategy extends ActionMappingStrategy {
32     
33     /**
34      * Gets the mapping action to map the given element.
35      * @param namespace not null
36      * @param name not null
37      * @param attributes <code>Attributes</code>, not null
38      * @param context <code>ReadContext</code>, not null
39      * @return <code>MappingAction</code>, not null
40      * @throws Exception
41      */
42     public MappingAction getMappingAction(
43                             String JavaDoc namespace,
44                             String JavaDoc name,
45                             Attributes JavaDoc attributes,
46                             ReadContext context)
47         throws Exception JavaDoc {
48         MappingAction result = MappingAction.EMPTY;
49             
50         ElementDescriptor activeDescriptor = context.getCurrentDescriptor();
51         if (activeDescriptor != null) {
52             if (activeDescriptor.isHollow()) {
53                 if (isArrayDescriptor(activeDescriptor)) {
54                     result = ArrayBindAction.createMappingAction(activeDescriptor);
55                 } else {
56                     result = BeanBindAction.INSTANCE;
57                 }
58             }
59             else if (activeDescriptor.isSimple())
60             {
61                 result = SimpleTypeBindAction.INSTANCE;
62             }
63             else
64             {
65                 ElementDescriptor[] descriptors
66                     = activeDescriptor.getElementDescriptors();
67                 if (descriptors.length == 1) {
68                     ElementDescriptor childDescriptor = descriptors[0];
69                     if (childDescriptor.isHollow()
70                             && isArrayDescriptor(childDescriptor)) {
71                         result = ArrayBindAction.createMappingAction(childDescriptor);
72                     }
73                 }
74             }
75         }
76         return result;
77     }
78     
79     /**
80      * Is the give
81      * @param descriptor <code>ElementDescriptor</code>, possibly null
82      * @return true if the descriptor describes an array property, if null returns false
83      */
84     private boolean isArrayDescriptor(ElementDescriptor descriptor) {
85         boolean result = false;
86         if (descriptor != null) {
87             Class JavaDoc propertyType = descriptor.getPropertyType();
88             if (propertyType != null) {
89                 result = propertyType.isArray();
90             }
91         }
92         return result;
93     }
94 }
95
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