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1 package jfun.yan.etc;
2
3 import java.beans.IntrospectionException  ;
4 import java.lang.reflect.Method ;
5 import java.util.ArrayList ;
6 import java.util.HashMap ;
7 import java.util.Iterator ;
8 import java.util.Set ;
9
10 import jfun.util.beans.BeanType;
11
12
22 public class TypeFilteredPropertyPredicate implements PropertyPredicate {
23 private final HashMap filter_types = new HashMap ();
24 public boolean isProperty(Class type, Object key, Class property_type) {
25 final Object t = filter_types.get(key);
26 if(t==null) return false;
27 if(t instanceof Class ){
28 return ((Class )t).isAssignableFrom(type);
29 }
30 else{
31 final ArrayList types = (ArrayList )t;
32 final int sz = types.size();
33 for(int i=0; i<sz; i++){
34 final Class filter_type = (Class )types.get(i);
35 if(filter_type.isAssignableFrom(type)){
36 return true;
37 }
38 }
39 return false;
40 }
41 }
42
47 public TypeFilteredPropertyPredicate addType(Class type){
48 try{
49 final BeanType btype = BeanType.instance(type);
50 final Set names = btype.getPropertyNames();
51 for(Iterator it=names.iterator();it.hasNext();){
52 final String key = (String )it.next();
53 final Method writer = btype.getWriter(key);
54 if(writer!=null){
55 addProperty(writer.getDeclaringClass(), key);
56 }
57 }
58 }
59 catch(IntrospectionException e){}
60 return this;
61 }
62
68 public TypeFilteredPropertyPredicate addProperty(Class type, String key){
69 final Object slot = filter_types.get(key);
70 if(slot==null){
71 filter_types.put(key, type);
72 }
73 else{
74 final ArrayList list = toArrayList(slot);
75 list.add(type);
76 filter_types.put(key, list);
77 }
78 return this;
79 }
80 private static ArrayList toArrayList(Object slot){
81 if(slot instanceof Class ){
82 final ArrayList list = new ArrayList (4);
83 list.add(slot);
84 return list;
85 }
86 else{
87 return (ArrayList )slot;
88 }
89 }
90 }
91 |
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Java API By Example, From Geeks To Geeks.