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Java > Open Source Codes > freemarker > ext > beans > SimpleMethodModel


1 /*
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3  * reserved.
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10  * notice, this list of conditions and the following disclaimer.
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12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in
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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.
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30  * nor may "FreeMarker" or "Visigoth" appear in their names
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48  * individuals on behalf of the Visigoth Software Society. For more
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51  */
52
53 package freemarker.ext.beans;
54
55 import java.lang.reflect.InvocationTargetException JavaDoc;
56 import java.lang.reflect.Method JavaDoc;
57 import java.lang.reflect.Modifier JavaDoc;
58 import java.util.List JavaDoc;
59
60 import freemarker.template.SimpleNumber;
61 import freemarker.template.TemplateMethodModelEx;
62 import freemarker.template.TemplateModel;
63 import freemarker.template.TemplateModelException;
64 import freemarker.template.TemplateSequenceModel;
65 import freemarker.template.utility.Collections12;
66
67 /**
68  * A class that will wrap a reflected method call into a
69  * {@link freemarker.template.TemplateMethodModel} interface.
70  * It is used by {@link BeanModel} to wrap reflected method calls
71  * for non-overloaded methods.
72  * @author Attila Szegedi, szegedia at users dot sourceforge dot net
73  * @version $Id: SimpleMethodModel.java,v 1.27 2005/06/11 12:12:04 szegedia Exp $
74  */
75 final class SimpleMethodModel
76     implements
77     TemplateMethodModelEx,
78     TemplateSequenceModel
79 {
80     private final Object JavaDoc object;
81     private final Method JavaDoc method;
82     private final Class JavaDoc[] argTypes;
83     private final BeansWrapper wrapper;
84
85     /**
86      * Creates a model for a specific method on a specific object.
87      * @param object the object to call the method on. Can be
88      * <tt>null</tt> for static methods.
89      * @param method the method that will be invoked.
90      */
91     SimpleMethodModel(Object JavaDoc object, Method JavaDoc method, Class JavaDoc[] argTypes,
92             BeansWrapper wrapper)
93     {
94         this.object = object;
95         this.method = method;
96         this.argTypes = argTypes;
97         this.wrapper = wrapper;
98     }
99
100     /**
101      * Invokes the method, passing it the arguments from the list.
102      */
103     public Object JavaDoc exec(List JavaDoc arguments)
104         throws
105         TemplateModelException
106     {
107         try
108         {
109             Object JavaDoc[] args = wrapper.unwrapArguments(arguments, argTypes);
110             if(args != null) {
111                 BeansWrapper.coerceBigDecimals(method, args);
112             }
113             return wrapper.invokeMethod(object, method, args);
114         }
115         catch(Exception JavaDoc e)
116         {
117             while(e instanceof InvocationTargetException JavaDoc)
118             {
119                 Throwable JavaDoc t = ((InvocationTargetException JavaDoc)e).getTargetException();
120                 if(t instanceof Exception JavaDoc)
121                 {
122                     e = (Exception JavaDoc)t;
123                 }
124                 else
125                 {
126                     break;
127                 }
128             }
129             if((method.getModifiers() & Modifier.STATIC) != 0)
130             {
131                 throw new TemplateModelException("Method " + method +
132                         " threw an exception", e);
133             }
134             else
135             {
136                 throw new TemplateModelException("Method " + method +
137                         " threw an exception when invoked on " + object, e);
138             }
139         }
140     }
141
142     public TemplateModel get(int index)
143         throws
144         TemplateModelException
145     {
146         return (TemplateModel) exec(Collections12.singletonList(new SimpleNumber(new Integer JavaDoc(index))));
147     }
148
149     public int size() throws TemplateModelException
150     {
151         throw new TemplateModelException("?size is unsupported for: " + getClass().getName());
152     }
153 }
154
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