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16 package net.sf.cglib.proxy;
17
18 import net.sf.cglib.core.ReflectUtils;
19 import java.lang.reflect.Method  ;
20 import java.util.*;
21
22
25 abstract public class CallbackHelper
26 implements CallbackFilter
27 {
28 private Map methodMap = new HashMap();
29 private List callbacks = new ArrayList();
30
31 public CallbackHelper(Class superclass, Class [] interfaces)
32 {
33 List methods = new ArrayList();
34 Enhancer.getMethods(superclass, interfaces, methods);
35 Map indexes = new HashMap();
36 for (int i = 0, size = methods.size(); i < size; i++) {
37 Method method = (Method )methods.get(i);
38 Object callback = getCallback(method);
39 if (callback == null)
40 throw new IllegalStateException ("getCallback cannot return null");
41 boolean isCallback = callback instanceof Callback;
42 if (!(isCallback || (callback instanceof Class )))
43 throw new IllegalStateException ("getCallback must return a Callback or a Class");
44 if (i > 0 && ((callbacks.get(i - 1) instanceof Callback) ^ isCallback))
45 throw new IllegalStateException ("getCallback must return a Callback or a Class consistently for every Method");
46 Integer index = (Integer )indexes.get(callback);
47 if (index == null) {
48 index = new Integer (callbacks.size());
49 indexes.put(callback, index);
50 }
51 methodMap.put(method, index);
52 callbacks.add(callback);
53 }
54 }
55
56 abstract protected Object getCallback(Method method);
57
58 public Callback[] getCallbacks()
59 {
60 if (callbacks.size() == 0)
61 return new Callback[0];
62 if (callbacks.get(0) instanceof Callback) {
63 return (Callback[])callbacks.toArray(new Callback[callbacks.size()]);
64 } else {
65 throw new IllegalStateException ("getCallback returned classes, not callbacks; call getCallbackTypes instead");
66 }
67 }
68
69 public Class [] getCallbackTypes()
70 {
71 if (callbacks.size() == 0)
72 return new Class [0];
73 if (callbacks.get(0) instanceof Callback) {
74 return ReflectUtils.getClasses(getCallbacks());
75 } else {
76 return (Class [])callbacks.toArray(new Class [callbacks.size()]);
77 }
78 }
79
80 public int accept(Method method)
81 {
82 return ((Integer )methodMap.get(method)).intValue();
83 }
84
85 public int hashCode()
86 {
87 return methodMap.hashCode();
88 }
89
90 public boolean equals(Object o)
91 {
92 if (o == null)
93 return false;
94 if (!(o instanceof CallbackHelper))
95 return false;
96 return methodMap.equals(((CallbackHelper)o).methodMap);
97 }
98 }
99 |
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