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1
21 package com.db4o;
22
23 import com.db4o.reflect.*;
24
25
26 public final class EventDispatcher {
27 private static final String  [] events = {
28 "objectCanDelete",
29 "objectOnDelete",
30 "objectOnActivate",
31 "objectOnDeactivate",
32 "objectOnNew",
33 "objectOnUpdate",
34 "objectCanActivate",
35 "objectCanDeactivate",
36 "objectCanNew",
37 "objectCanUpdate"
38 };
39
40 static final int CAN_DELETE = 0;
41 static final int DELETE = 1;
42 static final int SERVER_COUNT = 2;
43 static final int ACTIVATE = 2;
44 static final int DEACTIVATE = 3;
45 static final int NEW = 4;
46 public static final int UPDATE = 5;
47 static final int CAN_ACTIVATE = 6;
48 static final int CAN_DEACTIVATE = 7;
49 static final int CAN_NEW = 8;
50 static final int CAN_UPDATE = 9;
51 static final int COUNT = 10;
52
53 private final ReflectMethod[] methods;
54
55 private EventDispatcher(ReflectMethod[] methods_){
56 methods = methods_;
57 }
58
59 boolean dispatch(YapStream stream, Object obj, int eventID){
60 if(methods[eventID] != null){
61 Object [] parameters = new Object []{stream};
62 int stackDepth = stream.stackDepth();
63 int topLevelCallId = stream.topLevelCallId();
64 stream.stackDepth(0);
65 try{
66 Object res = methods[eventID].invoke(obj,parameters);
67 if(res != null && res instanceof Boolean ){
68 return ((Boolean )res).booleanValue();
69 }
70 }catch(Throwable t){
71
73 } finally {
74 stream.stackDepth(stackDepth);
75 stream.topLevelCallId(topLevelCallId);
76 }
77 }
78 return true;
79 }
80
81 static EventDispatcher forClass(YapStream a_stream, ReflectClass classReflector){
82
83 if(a_stream == null || classReflector == null){
84 return null;
85 }
86
87 EventDispatcher dispatcher = null;
88 int count = 0;
89 if(a_stream.configImpl().callbacks()){
90 count = COUNT;
91 }else if(a_stream.configImpl().isServer()){
92 count = SERVER_COUNT;
93 }
94 if(count > 0){
95 ReflectClass[] parameterClasses = {a_stream.i_handlers.ICLASS_OBJECTCONTAINER};
96 ReflectMethod[] methods = new ReflectMethod[COUNT];
97 for (int i = COUNT -1; i >=0; i--){
98 try{
99 ReflectMethod method = classReflector.getMethod(events[i], parameterClasses);
100 if (null == method) {
101 method = classReflector.getMethod(toPascalCase(events[i]), parameterClasses);
102 }
103 if( method != null){
104 methods[i] = method;
105 if(dispatcher == null){
106 dispatcher = new EventDispatcher(methods);
107 }
108 }
109 }catch(Throwable t){}
110 }
111 }
112
113 return dispatcher;
114 }
115
116 private static String toPascalCase(String name) {
117 return name.substring(0, 1).toUpperCase() + name.substring(1);
118 }
119 }
120 |
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