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Java > Open Source Codes > org > apache > cayenne > enhancer > CayenneEnhancerVisitorFactory


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19 package org.apache.cayenne.enhancer;
20
21 import java.util.HashMap JavaDoc;
22 import java.util.Map JavaDoc;
23
24 import org.apache.cayenne.map.EntityResolver;
25 import org.apache.cayenne.map.ObjEntity;
26 import org.objectweb.asm.ClassVisitor;
27 import org.objectweb.asm.commons.SerialVersionUIDAdder;
28
29 /**
30  * A factory of enhacing visitors.
31  *
32  * @since 3.0
33  * @author Andrus Adamchik
34  */
35 public class CayenneEnhancerVisitorFactory implements EnhancerVisitorFactory {
36
37     protected Map JavaDoc<String JavaDoc, ObjEntity> entitiesByClass;
38
39     public CayenneEnhancerVisitorFactory(EntityResolver entityResolver) {
40         indexEntities(entityResolver);
41     }
42
43     protected void indexEntities(EntityResolver entityResolver) {
44         // EntityResolver doesn't have an index by class name, (let alone using
45 // "internal" class names with slashes as keys), so we have to build it
46 // manually
47
48         this.entitiesByClass = new HashMap JavaDoc<String JavaDoc, ObjEntity>();
49         for (Object JavaDoc object : entityResolver.getObjEntities()) {
50             ObjEntity entity = (ObjEntity) object;
51             entitiesByClass.put(entity.getClassName(), entity);
52         }
53     }
54
55     public ClassVisitor createVisitor(String JavaDoc className, ClassVisitor out) {
56         ObjEntity entity = entitiesByClass.get(className.replace('/', '.'));
57         if (entity == null) {
58             return null;
59         }
60
61         // create enhancer chain
62 PersistentInterfaceVisitor e1 = new PersistentInterfaceVisitor(out);
63         PersistentAccessorVisitor e2 = new PersistentAccessorVisitor(e1, entity);
64
65         // this ensures that both enhanced and original classes have compatible serialized
66 // format even if no serialVersionUID is defined by the user
67 SerialVersionUIDAdder e3 = new SerialVersionUIDAdder(e2);
68         return e3;
69     }
70 }
71
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