|
1 package org.sapia.regis.bean;
2
3 import java.lang.reflect.InvocationHandler  ;
4 import java.lang.reflect.Method ;
5 import java.util.HashMap ;
6 import java.util.Map ;
7
8 import org.sapia.regis.Node;
9 import org.sapia.regis.RegisSession;
10 import org.sapia.regis.Registry;
11 import org.sapia.regis.SessionUtil;
12 import org.sapia.regis.type.BuiltinType;
13 import org.sapia.regis.type.BuiltinTypes;
14
15 public class NodeInvocationHandler implements InvocationHandler {
16
17 static final String REG_PROVIDER_METHOD = "getRegistry";
18
19 private Registry _reg;
20 private Node _delegate;
21 private Map _methodsToProps = new HashMap ();
22
23 public NodeInvocationHandler(Registry reg, Node delegate, Class interf){
24 _delegate = delegate;
25 _reg = reg;
26 Method [] methods = interf.getMethods();
27 for(int i = 0; i < methods.length; i++){
28 Method m = methods[i];
29 if(m.getDeclaringClass().equals(Object .class)){
30 continue;
31 }
32 else{
33 if(m.getName().startsWith("get") &&
34 m.getName().length()>3 &&
35 !m.getReturnType().equals(void.class)){
36 String propName = propName(m.getName().substring(3));
37 BuiltinType type = BuiltinTypes.getTypeFor(m.getReturnType());
38 if(type == null){
39 throw new InvalidReturnTypeException("Property " + propName +
40 " does not correspond to a valid configuration type: " + m.getReturnType().getName());
41 }
42 PropertyConf conf = new PropertyConf();
43 conf.name = propName;
44 conf.type = type;
45 _methodsToProps.put(m, conf);
46 }
47 }
48 }
49 }
50
51 public Object invoke(Object proxy, Method method, Object [] args) throws Throwable {
52
53 PropertyConf conf = (PropertyConf)_methodsToProps.get(method);
54 if(conf != null){
55 if(SessionUtil.isJoined()){
56 return conf.getProperty(_delegate);
57 }
58 else{
59 RegisSession session = _reg.open();
60 try{
61 return conf.getProperty(_delegate);
62 }finally{
63 session.close();
64 }
65 }
66 }
67 else if(method.getName().equals(REG_PROVIDER_METHOD)){
68 return _reg;
69 }
70 else{
71 throw new InvalidPropertyException("No method corresponds to property " + conf.name + " on Node: " + _delegate.getAbsolutePath());
72 }
73 }
74
75 public String propName(String name){
76 StringBuffer buf = new StringBuffer (name);
77 buf.setCharAt(0, Character.toLowerCase(name.charAt(0)));
78 return buf.toString();
79 }
80
81 static class PropertyConf{
82 private String name;
83 private BuiltinType type;
84
85 Object getProperty(Node delegate){
86 return type.getProperty(name, delegate);
87 }
88 }
89
90 }
91 |
Popular Tags |
Java API By Example, From Geeks To Geeks.