/*
* Copyright 2008-2009 LinkedIn, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package org.sdnplatform.sync;
import java.util.List;
/**
* A method for resolving inconsistent object values into a single value.
* Applications can implement this to provide a method for reconciling conflicts
* that cannot be resolved simply by the version information.
*
*
*/
public interface IInconsistencyResolver<T> {
/**
* Take two different versions of an object and combine them into a single
* version of the object Implementations must maintain the contract that
* <ol>
* <li>
* {@code resolveConflict([null, null]) == null}</li>
* <li>
* if {@code t != null}, then
*
* {@code resolveConflict([null, t]) == resolveConflict([t, null]) == t}</li>
*
* @param items The items to be resolved
* @return The united object
*/
public List<T> resolveConflicts(List<T> items);
}