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1
25
26 package org.snipsnap.interceptor;
27
28 import org.snipsnap.interceptor.custom.*;
29 import org.snipsnap.snip.BlogImpl;
30 import org.snipsnap.snip.SnipImpl;
31 import org.snipsnap.snip.SnipSpaceImpl;
32
33 import java.lang.reflect.InvocationHandler  ;
34 import java.lang.reflect.Method ;
35 import java.lang.reflect.Proxy ;
36 import java.util.ArrayList ;
37 import java.util.List ;
38
39 public class Aspects implements InvocationHandler {
40 private Object target = null;
41 private List interceptors;
42
43
46 static ThreadLocal currentThis = new ThreadLocal ();
47
48 public static boolean hasTarget(Object proxy) {
49 return ((Aspects) Proxy.getInvocationHandler(proxy)).hasTarget();
50 }
51
52 private boolean hasTarget() {
53 return null != target;
54 }
55
56 public static Object getThis() {
57 return currentThis.get();
58 }
59
60 public static Object newInstance(Object target) {
61 return newInstance(target, target.getClass().getInterfaces());
62 }
63
64 public static Object newInstance(Object target, Class interfaceTarget) {
65 return newInstance(target, new Class []{interfaceTarget});
66 }
67
68 public static Object newInstance(Object target, Class [] interfaceTargets) {
69 Class targetClass = target.getClass();
70 Class interfaces[] = interfaceTargets;
71 Aspects aspects = new Aspects(target);
72 if (target.getClass().equals(SnipImpl.class)) {
73 aspects.addInterceptor(new ACLInterceptor());
74 } else if (target.getClass().equals(SnipSpaceImpl.class)) {
75 aspects.addInterceptor(new MissingInterceptor());
76 aspects.addInterceptor(new SnipSpaceACLInterceptor());
77 aspects.addInterceptor(new StoreInterceptor());
78 } else if (target.getClass().equals(BlogImpl.class)) {
79 aspects.addInterceptor(new BlogACLInterceptor());
80 }
81 return Proxy.newProxyInstance(targetClass.getClassLoader(),
82 interfaces, aspects);
83 }
84
85 public Aspects(Object target) {
86 this.target = target;
87 interceptors = new ArrayList ();
88 }
89
90 public void addInterceptor(Interceptor interceptor) {
91 interceptors.add(interceptor);
92 }
93
94 public Object invoke(Object proxy, Method method, Object [] args) throws Throwable {
95 Object invocationResult = null;
97 Object previousThis = currentThis.get();
98 currentThis.set(proxy);
99 Invocation i = new Invocation(target, method, args, interceptors);
100 try {
101 invocationResult = i.next();
102 } catch (Throwable throwable) {
103 throwable.printStackTrace();
104 } finally {
105 currentThis.set(previousThis);
106 }
107
108 return invocationResult;
109 }
110 }
111 |
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