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* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing,
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package org.apache.cayenne.enhancer;
import java.util.HashMap;
import java.util.Map;
import org.apache.cayenne.map.Embeddable;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.map.ObjEntity;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.commons.SerialVersionUIDAdder;
/**
* EnhancerVisitorFactory implementation based on Cayenne mapping.
*
* @since 3.0
* @author Andrus Adamchik
*/
public class CayenneEnhancerVisitorFactory implements EnhancerVisitorFactory {
protected Map<String, ObjEntity> entitiesByClass;
protected Map<String, Embeddable> embeddablesByClass;
public CayenneEnhancerVisitorFactory(EntityResolver entityResolver) {
indexEntities(entityResolver);
}
protected void indexEntities(EntityResolver entityResolver) {
// EntityResolver doesn't have an index by class name, (let alone using
// "internal" class names with slashes as keys), so we have to build it
// manually
this.entitiesByClass = new HashMap<String, ObjEntity>();
for (ObjEntity entity : entityResolver.getObjEntities()) {
entitiesByClass.put(entity.getClassName(), entity);
}
this.embeddablesByClass = new HashMap<String, Embeddable>();
for (Embeddable embeddable : entityResolver.getEmbeddables()) {
embeddablesByClass.put(embeddable.getClassName(), embeddable);
}
}
public ClassVisitor createVisitor(String className, ClassVisitor out) {
String key = className.replace('/', '.');
ObjEntity entity = entitiesByClass.get(key);
if (entity != null) {
// create enhancer chain
PojoVisitor e1 = new CayennePojoVisitor(out, entity);
PersistentAccessorVisitor e2 = new PersistentAccessorVisitor(e1, entity);
// this ensures that both enhanced and original classes have compatible
// serialized
// format even if no serialVersionUID is defined by the user
SerialVersionUIDAdder e3 = new SerialVersionUIDAdder(e2);
return e3;
}
Embeddable embeddable = embeddablesByClass.get(key);
if (embeddable != null) {
// create enhancer chain
EmbeddableVisitor e1 = new EmbeddableVisitor(out);
// this ensures that both enhanced and original classes have compatible
// serialized
// format even if no serialVersionUID is defined by the user
SerialVersionUIDAdder e2 = new SerialVersionUIDAdder(e1);
return e2;
}
return null;
}
}