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1 package org.hibernate.tuple;
3
4 import org.hibernate.mapping.PersistentClass;
5 import org.hibernate.mapping.Component;
6
7 import java.io.Serializable  ;
8 import java.util.HashMap ;
9 import java.util.Map ;
10 import java.util.Set ;
11 import java.util.HashSet ;
12 import java.util.Iterator ;
13
14
15 public class DynamicMapInstantiator implements Instantiator {
16 public static final String KEY = "$type$";
17
18 private String entityName;
19 private Set isInstanceEntityNames = new HashSet ();
20
21 public DynamicMapInstantiator() {
22 this.entityName = null;
23 }
24
25 public DynamicMapInstantiator(PersistentClass mappingInfo) {
26 this.entityName = mappingInfo.getEntityName();
27 isInstanceEntityNames.add( entityName );
28 if ( mappingInfo.hasSubclasses() ) {
29 Iterator itr = mappingInfo.getSubclassClosureIterator();
30 while ( itr.hasNext() ) {
31 final PersistentClass subclassInfo = ( PersistentClass ) itr.next();
32 isInstanceEntityNames.add( subclassInfo.getEntityName() );
33 }
34 }
35 }
36
37 public final Object instantiate(Serializable id) {
38 return instantiate();
39 }
40
41 public final Object instantiate() {
42 Map map = generateMap();
43 if ( entityName!=null ) {
44 map.put( KEY, entityName );
45 }
46 return map;
47 }
48
49 public final boolean isInstance(Object object) {
50 if ( object instanceof Map ) {
51 if ( entityName == null ) {
52 return true;
53 }
54 String type = ( String ) ( ( Map ) object ).get( KEY );
55 return type == null || isInstanceEntityNames.contains( type );
56 }
57 else {
58 return false;
59 }
60 }
61
62 protected Map generateMap() {
63 return new HashMap ();
64 }
65 } |
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