/*
* Copyright (c) 2010 Lockheed Martin Corporation
*
* 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.eurekastreams.server.persistence.mappers.chained;
/**
* Result combiner that returns one of the results that's not null.
*
* @param <T>
* the type of response to handle
*/
public class NonNullResultsCombiner<T> implements ResultsCombinerStrategy<Object, T>
{
/**
* Return the first non-null value.
*
* @param inResponse1
* the first response to return if not null
* @param inResponse2
* the second response to return if not null
* @param request
* the request, not used.
* @return inResponse1 if not null, else inResponse2
*/
public T combine(final PartialMapperResponse<Object, T> inResponse1, final T inResponse2, final Object request)
{
return inResponse1.getResponse() != null ? inResponse1.getResponse() : inResponse2;
}
}