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Java > Open Source Codes > freemarker > ext > jython > JythonNumberModel


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.ext.jython;
54
55 import org.python.core.Py;
56 import org.python.core.PyException;
57 import org.python.core.PyObject;
58
59 import freemarker.ext.util.ModelFactory;
60 import freemarker.template.ObjectWrapper;
61 import freemarker.template.TemplateModel;
62 import freemarker.template.TemplateModelException;
63 import freemarker.template.TemplateNumberModel;
64
65 /**
66  * Model for Jython numeric objects ({@link org.python.core.PyInteger}, {@link org.python.core.PyLong},
67  * {@link org.python.core.PyFloat}).
68  * @version $Id: JythonNumberModel.java,v 1.10 2003/11/12 21:53:40 ddekany Exp $
69  * @author Attila Szegedi
70  */
71 public class JythonNumberModel
72 extends
73     JythonModel
74 implements
75     TemplateNumberModel
76 {
77     static final ModelFactory FACTORY =
78         new ModelFactory()
79         {
80             public TemplateModel create(Object JavaDoc object, ObjectWrapper wrapper)
81             {
82                 return new JythonNumberModel((PyObject)object, (JythonWrapper)wrapper);
83             }
84         };
85         
86     public JythonNumberModel(PyObject object, JythonWrapper wrapper)
87     {
88         super(object, wrapper);
89     }
90
91     /**
92      * Returns either {@link PyObject#__tojava__(java.lang.Class)} with
93      * {@link java.lang.Number}.class as argument. If that fails, returns
94      * {@link PyObject#__float__()}.
95      */
96     public Number JavaDoc getAsNumber() throws TemplateModelException
97     {
98         try
99         {
100             Object JavaDoc value = object.__tojava__(java.lang.Number JavaDoc.class);
101             if(value == null || value == Py.NoConversion)
102             {
103                 return new Double JavaDoc(object.__float__().getValue());
104             }
105             return (Number JavaDoc)value;
106         }
107         catch(PyException e)
108         {
109             throw new TemplateModelException(e);
110         }
111     }
112 }
113
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