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Java > Open Source Codes > org > apache > cayenne > jpa > enhancer > JpaEnhancerVisitorFactory


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19 package org.apache.cayenne.jpa.enhancer;
20
21 import java.util.Map JavaDoc;
22
23 import org.apache.cayenne.enhancer.EnhancerVisitorFactory;
24 import org.apache.cayenne.enhancer.PersistentInterfaceVisitor;
25 import org.apache.cayenne.jpa.map.JpaClassDescriptor;
26 import org.objectweb.asm.ClassVisitor;
27 import org.objectweb.asm.commons.SerialVersionUIDAdder;
28
29 /**
30  * Class enhancer used for JPA.
31  *
32  * @author Andrus Adamchik
33  */
34 public class JpaEnhancerVisitorFactory implements EnhancerVisitorFactory {
35
36     private Map JavaDoc<String JavaDoc, JpaClassDescriptor> managedClasses;
37
38     public JpaEnhancerVisitorFactory(Map JavaDoc<String JavaDoc, JpaClassDescriptor> managedClasses) {
39         this.managedClasses = managedClasses;
40     }
41
42     public ClassVisitor createVisitor(String JavaDoc className, ClassVisitor out) {
43         JpaClassDescriptor descriptor = managedClasses.get(className.replace('/', '.'));
44         if (descriptor == null) {
45             return null;
46         }
47
48         // from here the code is copied essentially verbatim
49 // from CayenneEnhancerVisitorFactory.
50
51         // create enhancer chain
52 PersistentInterfaceVisitor e1 = new PersistentInterfaceVisitor(out);
53         JpaAccessorVisitor e2 = new JpaAccessorVisitor(e1, descriptor);
54
55         // this ensures that both enhanced and original classes have compatible serialized
56 // format even if no serialVersionUID is defined by the user
57 SerialVersionUIDAdder e3 = new SerialVersionUIDAdder(e2);
58
59         return e3;
60     }
61 }
62
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