protected void initMergePolicyApplierMap() {
mergePolicyApplierMap = new HashMap<MergePolicy, MergePolicyApplier>();
mergePolicyApplierMap.put(PersistenceDelegate.MergePolicy.RESET, new ResetMergePolicy());
mergePolicyApplierMap.put(PersistenceDelegate.MergePolicy.UNION, new UnionMergePolicy());
}