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package org.apache.tapestry.enhance; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.ParameterizedType; |
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import java.lang.reflect.Type; |
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import java.lang.reflect.TypeVariable; |
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public class GenericsMethodSignatureImpl extends MethodSignatureImpl implements MethodSignature |
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{ |
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boolean _isGeneric; |
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|
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public GenericsMethodSignatureImpl(Class type, Method m) |
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{ |
32 | 0 | super(findReturnType(type, m), m.getName(), findParameterTypes(type, m), m.getExceptionTypes()); |
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|
34 | 0 | _isGeneric = type.getGenericSuperclass() != null && ParameterizedType.class.isInstance(type.getGenericSuperclass()); |
35 | 0 | } |
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public boolean isGeneric() |
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{ |
39 | 0 | return _isGeneric; |
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} |
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static Class findReturnType(Class type, Method m) |
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{ |
44 | 0 | Type ret = m.getGenericReturnType(); |
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|
46 | 0 | if (TypeVariable.class.isInstance(ret) |
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&& type.getGenericSuperclass() != null |
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&& ParameterizedType.class.isInstance(type.getGenericSuperclass())) { |
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|
50 | 0 | TypeVariable tvar = (TypeVariable)ret; |
51 | 0 | ParameterizedType param = (ParameterizedType)type.getGenericSuperclass(); |
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|
53 | 0 | Class resolvedType = resolveType(param, tvar); |
54 | 0 | if (resolvedType != null) |
55 | 0 | return resolvedType; |
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} |
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59 | 0 | return m.getReturnType(); |
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} |
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static Class resolveType(ParameterizedType param, TypeVariable var) |
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{ |
64 | 0 | if (param.getActualTypeArguments().length < 1) |
65 | 0 | return null; |
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|
67 | 0 | for (int i=0; i < var.getBounds().length; i++) { |
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69 | 0 | Type t = var.getBounds()[i]; |
70 | 0 | Class resolvedType = null; |
71 | 0 | if (ParameterizedType.class.isInstance(t)) { |
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|
73 | 0 | ParameterizedType pparam = (ParameterizedType)t; |
74 | 0 | for (int e=0; e < pparam.getActualTypeArguments().length; e++) { |
75 | 0 | if (!TypeVariable.class.isInstance(pparam.getActualTypeArguments()[e])) |
76 | 0 | continue; |
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|
78 | 0 | resolvedType = resolveType(pparam, (TypeVariable)pparam.getActualTypeArguments()[e]); |
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} |
80 | 0 | } else { |
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|
82 | 0 | resolvedType = findType(param.getActualTypeArguments(), (Class)t); |
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} |
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|
85 | 0 | if (resolvedType != null) |
86 | 0 | return resolvedType; |
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} |
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|
89 | 0 | return null; |
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} |
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static Class findType(Type[] types, Class type) |
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{ |
94 | 0 | for (int i = 0; i < types.length; i++) { |
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|
96 | 0 | if (Class.class.isInstance(types[i]) && type.isAssignableFrom((Class)types[i])) |
97 | 0 | return (Class)types[i]; |
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} |
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100 | 0 | return null; |
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} |
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static Class[] findParameterTypes(Class type, Method m) |
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{ |
105 | 0 | if (type.getGenericSuperclass() == null |
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|| !ParameterizedType.class.isInstance(type.getGenericSuperclass())) |
107 | 0 | return m.getParameterTypes(); |
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|
109 | 0 | ParameterizedType param = (ParameterizedType)type.getGenericSuperclass(); |
110 | 0 | Type[] genTypes = m.getGenericParameterTypes(); |
111 | 0 | Class[] types = new Class[genTypes.length]; |
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typeSearch: |
114 | 0 | for (int i=0; i < genTypes.length; i++) { |
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116 | 0 | if (TypeVariable.class.isInstance(genTypes[i])) { |
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118 | 0 | Class resolved = resolveType(param, (TypeVariable)genTypes[i]); |
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120 | 0 | if (resolved != null) { |
121 | 0 | types[i] = resolved; |
122 | 0 | continue; |
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} |
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} |
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|
126 | 0 | types[i] = m.getParameterTypes()[i]; |
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} |
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129 | 0 | return types; |
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} |
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} |