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


1 /*
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3  * reserved.
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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:
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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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52
53 package freemarker.ext.beans;
54
55
56 import java.lang.reflect.InvocationTargetException JavaDoc;
57 import java.lang.reflect.Method JavaDoc;
58 import java.lang.reflect.Modifier JavaDoc;
59 import java.util.List JavaDoc;
60
61 import freemarker.template.SimpleNumber;
62 import freemarker.template.TemplateMethodModelEx;
63 import freemarker.template.TemplateModel;
64 import freemarker.template.TemplateModelException;
65 import freemarker.template.TemplateSequenceModel;
66 import freemarker.template.utility.Collections12;
67
68 /**
69  * A class that will wrap a reflected method call into a
70  * {@link freemarker.template.TemplateMethodModel} interface.
71  * It is used by {@link BeanModel} to wrap reflected method calls
72  * for overloaded methods.
73  * @author Attila Szegedi, szegedia at users dot sourceforge dot net
74  * @version $Id: OverloadedMethodModel.java,v 1.24 2004/11/11 13:42:56 szegedia Exp $
75  */
76 class OverloadedMethodModel
77 implements
78     TemplateMethodModelEx,
79     TemplateSequenceModel
80 {
81     private final Object JavaDoc object;
82     private final MethodMap methodMap;
83     private final BeansWrapper wrapper;
84         
85     public OverloadedMethodModel(Object JavaDoc object, MethodMap methodMap, BeansWrapper wrapper)
86     {
87         this.object = object;
88         this.methodMap = methodMap;
89         this.wrapper = wrapper;
90     }
91
92     /**
93      * Invokes the method, passing it the arguments from the list. The actual
94      * method to call from several overloaded methods will be chosen based
95      * on the classes of the arguments.
96      * @throws TemplateModelException if the method cannot be chosen
97      * unambiguously.
98      */
99     public Object JavaDoc exec(List JavaDoc arguments)
100     throws
101         TemplateModelException
102     {
103         Object JavaDoc[] args = wrapper.unwrapArguments(arguments);
104         Method JavaDoc method = (Method JavaDoc)methodMap.getMostSpecific(args);
105         if(args != null) {
106             BeansWrapper.coerceBigDecimals(method, args);
107         }
108         try
109         {
110             return wrapper.invokeMethod(object, method, args);
111         }
112         catch(Exception JavaDoc e)
113         {
114             while(e instanceof InvocationTargetException JavaDoc)
115             {
116                 Throwable JavaDoc t = ((InvocationTargetException JavaDoc)e).getTargetException();
117                 if(t instanceof Exception JavaDoc)
118                 {
119                     e = (Exception JavaDoc)t;
120                 }
121                 else
122                 {
123                     break;
124                 }
125             }
126             if((method.getModifiers() & Modifier.STATIC) != 0)
127             {
128                 throw new TemplateModelException("Method " + method +
129                         " threw an exception", e);
130             }
131             else
132             {
133                 throw new TemplateModelException("Method " + method +
134                         " threw an exception when invoked on " + object, e);
135             }
136         }
137     }
138
139     public TemplateModel get(int index)
140     throws
141         TemplateModelException
142     {
143         return (TemplateModel) exec(Collections12.singletonList(new SimpleNumber(new Integer JavaDoc(index))));
144     }
145
146
147     public int size() throws TemplateModelException
148     {
149         throw new TemplateModelException("_size is unsupported for: " + getClass().getName());
150     }
151 }
152
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