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Re: [eclipselink-users] Virtual Metlhods | questions
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Tom,
One step further.
I created the OneToOneMapping as follows
private void oneToOneMapping(ClassDescriptor classDescriptor) {
OneToOneMapping oneToOneMapping = new OneToOneMapping();
oneToOneMapping.setDescriptor(classDescriptor);
oneToOneMapping.setCascadeAll(true);
oneToOneMapping.useBasicIndirection();
VirtualAttributeAccessor virtualAttributeAccessor2 = new
VirtualAttributeAccessor();
virtualAttributeAccessor2.setAttributeName("phoneNumber");
virtualAttributeAccessor2.setGetMethodName("get");
virtualAttributeAccessor2.setSetMethodName("set");
virtualAttributeAccessor2.setValueType(ValueHolderInterface.class);
virtualAttributeAccessor2.initializeAttributes(classDescriptor.getJavaClass());
oneToOneMapping.setAttributeAccessor(virtualAttributeAccessor2);
oneToOneMapping.setAttributeName("phoneNumber");
oneToOneMapping.setReferenceClass(PhoneNumber.class);
oneToOneMapping.addForeignKeyFieldName("TLG_GC_EMPLOYEE.PHONE_NUMBER_ID",
"TLG_GC_PHONE.ID");
classDescriptor.getMappings().add(oneToOneMapping);
}
and in the Employee entity set/get as (just test code may not 100 accurate)
public Object get(String key) {
return ValueHolderInterface.class.isInstance(extensions.get(key)) ?
ValueHolderInterface.class.cast(extensions.get(key)).getValue() :
extensions.get(key);
}
public Object get(String key,ValueHolderInterface valueHolderInterface) {
return ValueHolderInterface.class.isInstance(extensions.get(key)) ?
ValueHolderInterface.class.cast(extensions.get(key)).getValue() :
extensions.get(key);
}
public void set(String key,Object value) {
if (PhoneNumber.class.isInstance(value)) {
ValueHolderInterface valueHolderInterface = new ValueHolder();
valueHolderInterface.setValue(value);
extensions.put(key, valueHolderInterface);
} else {
extensions.put(key, value);
}
}
public void set(String key,ValueHolderInterface value) {
if (PhoneNumber.class.isInstance(value)) {
ValueHolderInterface valueHolderInterface = new ValueHolder();
valueHolderInterface.setValue(value);
extensions.put(key, valueHolderInterface);
} else {
extensions.put(key, value);
}
}
I getting the following exception in the insert scenario
Exception in thread "main" javax.persistence.EntityExistsException:
Exception Description: The mapping for the attribute [phoneNumber] uses
indirection, and so must be initialized to a new ValueHolder. Currently the
value is: [PhoneNumber(0: 613-5558812)].
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[phoneNumber]
Descriptor: RelationalDescriptor(gridcache.model.Employee -->
[DatabaseTable(TLG_GC_EMPLOYEE)])
at
org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:443)
at gridcache.example.InsertExample.main(InsertExample.java:28)
Caused by: Exception [EclipseLink-125] (Eclipse Persistence Services -
2.3.2.v20111125-r10461):
org.eclipse.persistence.exceptions.DescriptorException
Exception Description: The mapping for the attribute [phoneNumber] uses
indirection, and so must be initialized to a new ValueHolder. Currently the
value is: [PhoneNumber(0: 613-5558812)].
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[phoneNumber]
Descriptor: RelationalDescriptor(gridcache.model.Employee -->
[DatabaseTable(TLG_GC_EMPLOYEE)])
at
org.eclipse.persistence.exceptions.DescriptorException.valueHolderInstantiationMismatch(DescriptorException.java:1771)
at
org.eclipse.persistence.internal.indirection.BasicIndirectionPolicy.validateAttributeOfInstantiatedObject(BasicIndirectionPolicy.java:389)
at
org.eclipse.persistence.mappings.ForeignReferenceMapping.getAttributeValueFromObject(ForeignReferenceMapping.java:892)
at
org.eclipse.persistence.mappings.ObjectReferenceMapping.cascadeRegisterNewIfRequired(ObjectReferenceMapping.java:930)
at
org.eclipse.persistence.mappings.ObjectReferenceMapping.cascadeRegisterNewIfRequired(ObjectReferenceMapping.java:916)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeRegisterNewForCreate(ObjectBuilder.java:1945)
at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:4182)
at
org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:440)
... 1 more
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