/*
* 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;
import java.util.Map;
/**
* Simple mapper which retrieves values from an unchanging map. One use of this is to allow a class to get its data from
* a dictionary now but be upgraded transparently to get its data from another source later.
*
* @param <TRequestType>
* Lookup key type.
* @param <TReturnType>
* Data type.
*/
public class ImmutableMapLookupMapper<TRequestType, TReturnType> implements DomainMapper<TRequestType, TReturnType>
{
/** The map. */
private Map<TRequestType, TReturnType> map;
/**
* Constructor.
*
* @param inMap
* Map to use; access to the map is not synchronized by the mapper thus the map MUST NOT be altered.
*/
public ImmutableMapLookupMapper(final Map<TRequestType, TReturnType> inMap)
{
map = inMap;
}
/**
* {@inheritDoc}
*/
@Override
public TReturnType execute(final TRequestType inRequest)
{
return map.get(inRequest);
}
}