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DetachedValueMerger.java
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DetachedValueMerger.java
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package cz.cvut.kbss.jopa.sessions.merge;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import java.util.Collection;
import java.util.Map;
public class DetachedValueMerger implements ValueMerger {
private final UnitOfWorkImpl uow;
private final ValueMerger defaultValueMerger;
private final ManagedTypeValueMerger managedTypeMerger;
private final CollectionValueMerger collectionMerger;
private final MapValueMerger mapValueMerger;
public DetachedValueMerger(UnitOfWorkImpl uow) {
assert uow != null;
this.uow = uow;
this.defaultValueMerger = new DefaultValueMerger();
this.managedTypeMerger = new ManagedTypeValueMerger(uow);
this.collectionMerger = new CollectionValueMerger(uow, managedTypeMerger);
this.mapValueMerger = new MapValueMerger();
}
@Override
public void mergeValue(FieldSpecification<?, ?> att, Object target, Object originalValue, Object mergedValue,
Descriptor attributeDescriptor) {
getMerger(att).mergeValue(att, target, originalValue, mergedValue, attributeDescriptor);
}
private ValueMerger getMerger(FieldSpecification<?, ?> att) {
if (uow.isTypeManaged(att.getJavaType())) {
return managedTypeMerger;
} else if (Collection.class.isAssignableFrom(att.getJavaType())) {
return collectionMerger;
} else if (Map.class.isAssignableFrom(att.getJavaType())) {
return mapValueMerger;
} else {
return defaultValueMerger;
}
}
}