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Java > Open Source Codes > freemarker > template > DefaultObjectWrapper


1 /*
2  * Copyright (c) 2003 The Visigoth Software Society. All rights
3  * reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in
14  * the documentation and/or other materials provided with the
15  * distribution.
16  *
17  * 3. The end-user documentation included with the redistribution, if
18  * any, must include the following acknowledgement:
19  * "This product includes software developed by the
20  * Visigoth Software Society (http://www.visigoths.org/)."
21  * Alternately, this acknowledgement may appear in the software itself,
22  * if and wherever such third-party acknowledgements normally appear.
23  *
24  * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
25  * project contributors may be used to endorse or promote products derived
26  * from this software without prior written permission. For written
27  * permission, please contact visigoths@visigoths.org.
28  *
29  * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
30  * nor may "FreeMarker" or "Visigoth" appear in their names
31  * without prior written permission of the Visigoth Software Society.
32  *
33  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
34  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
36  * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
37  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
38  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
39  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
40  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
41  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
42  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
43  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44  * SUCH DAMAGE.
45  * ====================================================================
46  *
47  * This software consists of voluntary contributions made by many
48  * individuals on behalf of the Visigoth Software Society. For more
49  * information on the Visigoth Software Society, please see
50  * http://www.visigoths.org/
51  */

52
53 package freemarker.template;
54
55 import java.lang.reflect.Array JavaDoc;
56 import java.util.ArrayList JavaDoc;
57 import java.util.Collection JavaDoc;
58 import java.util.Iterator JavaDoc;
59 import java.util.Map JavaDoc;
60 import freemarker.ext.dom.NodeModel;
61
62 /**
63  * <p>The default implementation of the ObjectWrapper
64  * interface.
65  *
66  * @version $Id: DefaultObjectWrapper.java,v 1.23 2005/06/08 00:06:19 revusky Exp $
67  */

68 public class DefaultObjectWrapper extends freemarker.ext.beans.BeansWrapper {
69     
70     static final DefaultObjectWrapper instance = new DefaultObjectWrapper();
71     
72     static private Class JavaDoc W3C_DOM_NODE_CLASS,
73                          JYTHON_OBJ_CLASS;
74     
75     static private ObjectWrapper JYTHON_WRAPPER;
76     
77     static {
78         try {
79             W3C_DOM_NODE_CLASS = Class.forName("org.w3c.dom.Node");
80         } catch (Exception JavaDoc e) {}
81         try {
82             JYTHON_OBJ_CLASS = Class.forName("org.python.core.PyObject");
83             JYTHON_WRAPPER = freemarker.ext.jython.JythonWrapper.INSTANCE;
84         } catch (Exception JavaDoc e) {}
85     }
86     
87
88     public TemplateModel wrap(Object JavaDoc obj) throws TemplateModelException {
89         if (obj == null) {
90             return super.wrap(null);
91         }
92         if (obj instanceof TemplateModel) {
93             return (TemplateModel) obj;
94         }
95         if (obj instanceof String JavaDoc) {
96             return new SimpleScalar((String JavaDoc) obj);
97         }
98         if (obj instanceof Number JavaDoc) {
99             return new SimpleNumber((Number JavaDoc) obj);
100         }
101         if (obj instanceof java.util.Date JavaDoc) {
102             if(obj instanceof java.sql.Date JavaDoc) {
103                 return new SimpleDate((java.sql.Date JavaDoc) obj);
104             }
105             if(obj instanceof java.sql.Time JavaDoc) {
106                 return new SimpleDate((java.sql.Time JavaDoc) obj);
107             }
108             if(obj instanceof java.sql.Timestamp JavaDoc) {
109                 return new SimpleDate((java.sql.Timestamp JavaDoc) obj);
110             }
111             return new SimpleDate((java.util.Date JavaDoc) obj, getDefaultDateType());
112         }
113         if (obj.getClass().isArray()) {
114             obj = convertArray(obj);
115         }
116         if (obj instanceof Collection JavaDoc) {
117             return new SimpleSequence((Collection JavaDoc) obj, this);
118         }
119         if (obj instanceof Map JavaDoc) {
120             return new SimpleHash((Map JavaDoc) obj, this);
121         }
122         if (obj instanceof Boolean JavaDoc) {
123             return obj.equals(Boolean.TRUE) ? TemplateBooleanModel.TRUE : TemplateBooleanModel.FALSE;
124         }
125         if (obj instanceof Iterator JavaDoc) {
126             return new SimpleCollection((Iterator JavaDoc) obj, this);
127         }
128         return handleUnknownType(obj);
129     }
130     
131     
132     /**
133      * Called if an unknown type is passed in.
134      * Since 2.3, this falls back on XML wrapper and BeansWrapper functionality.
135      */

136     protected TemplateModel handleUnknownType(Object JavaDoc obj) throws TemplateModelException {
137         if ((W3C_DOM_NODE_CLASS != null && W3C_DOM_NODE_CLASS.isInstance(obj)))
138         {
139             return wrapDomNode(obj);
140         }
141         if (JYTHON_WRAPPER != null && JYTHON_OBJ_CLASS.isInstance(obj)) {
142             return JYTHON_WRAPPER.wrap(obj);
143         }
144         return super.wrap(obj);
145     }
146
147     
148     public TemplateModel wrapDomNode(Object JavaDoc obj) {
149         return NodeModel.wrap((org.w3c.dom.Node JavaDoc) obj);
150     }
151
152     /**
153      * Converts an array to a java.util.List
154      */

155     protected Object JavaDoc convertArray(Object JavaDoc arr) {
156         final int size = Array.getLength(arr);
157         ArrayList JavaDoc list = new ArrayList JavaDoc(size);
158         for (int i=0;i<size; i++) {
159             list.add(Array.get(arr, i));
160         }
161         return list;
162     }
163 }
164
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