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1
7 package com.tirsen.nanning.definition;
8
9 import java.lang.reflect.Method  ;
10 import java.util.*;
11
12 import com.tirsen.nanning.MethodInterceptor;
13 import com.tirsen.nanning.MixinInstance;
14
15
25 public class AspectDefinition {
26 private Class interfaceClass;
27 private List interceptorDefinitions = new ArrayList();
28 private Class targetClass;
29 private Map methodsToIndex;
30
31
36 public void setInterface(Class interfaceClass) {
37 this.interfaceClass = interfaceClass;
38 methodsToIndex = new HashMap();
39 Method [] methods = interfaceClass.getMethods();
40 for (int i = 0; i < methods.length; i++) {
41 Method method = methods[i];
42 methodsToIndex.put(method, new Integer (i));
43 }
44 }
45
46
52 public void addInterceptor(Class interceptorClass) {
53 addInterceptor(new InterceptorDefinition(interceptorClass));
54 }
55
56
61 public void addInterceptor(InterceptorDefinition interceptorDefinition) {
62 interceptorDefinitions.add(interceptorDefinition);
63 }
64
65
70 public void setTarget(Class targetClass) {
71 this.targetClass = targetClass;
72 }
73
74 MixinInstance createMixinInstance()
75 throws IllegalAccessException , InstantiationException {
76 if (targetClass != null) {
77 return newInstance(targetClass.newInstance());
78 } else {
79 return newInstance(null);
80 }
81 }
82
83 public Class getInterfaceClass() {
84 return interfaceClass;
85 }
86
87 MixinInstance newInstance(Object target) {
88 checkTarget(target);
89
90 MixinInstance mixinInstance = new MixinInstance();
91 mixinInstance.setInterfaceClass(getInterfaceClass());
92
93 for (Iterator iterator = interceptorDefinitions.iterator(); iterator.hasNext();) {
94 InterceptorDefinition interceptorDefinition = (InterceptorDefinition) iterator.next();
95 Method [] methods = mixinInstance.getAllMethods();
96 for (int j = 0; j < methods.length; j++) {
97 Method method = methods[j];
98 if (interceptorDefinition.interceptsMethod(method)) {
99 mixinInstance.addInterceptor(method, (MethodInterceptor) interceptorDefinition.newInstance());
100 }
101 }
102 }
103
104 mixinInstance.setTarget(target);
105 return mixinInstance;
106 }
107
108 private void checkTarget(Object target) {
109 if (target == null) {
110 return;
111 }
112
113 if (!interfaceClass.isInstance(target)) {
114 throw new IllegalArgumentException ("target does not implement interface: " + target);
115 }
116 if (!targetClass.isInstance(target)) {
117 throw new IllegalArgumentException ("target is not an instance of target-class: " + target);
118 }
119 }
120
121 public List getConstructionInterceptors() {
122 List interceptors = new ArrayList();
123 for (Iterator iterator = interceptorDefinitions.iterator(); iterator.hasNext();) {
124 InterceptorDefinition interceptorDefinition = (InterceptorDefinition) iterator.next();
125 if (interceptorDefinition.interceptsConstructor(getInterfaceClass())) {
126 interceptors.add(interceptorDefinition.newInstance());
127 }
128 }
129 return interceptors;
130 }
131
132 public Collection getInterceptorDefinitions() {
133 return interceptorDefinitions;
134 }
135 }
136 |
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