/*******************************************************************************
* Copyright 2010 Cees De Groot, Alex Boisvert, Jan Kotek
*
* 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 de.mxro.thrd.jdbm2V22;
/**
* Provides inverse view on persisted map.
* It uses hash index to find Key which belongs to Value. Value must correctly implement hashCode .
* Internally is backed by SecondaryTreeMap which uses value hashCode as Secondary key.
*
* @author Jan Kotek
*
* @param <K>
* @param <V>
*/
public interface InverseHashView<K, V>{
/**
* Finds first primary key which corresponds to value. There may be more then one, others are ignored
* @param val
* @return first primary key found or null if not found
*/
K findKeyForValue(V val);
/**
* Finds primary keys which corresponds to value. There may be more then one, others are ignored
* @param val
* @return primary keys found
*/
Iterable<K> findKeysForValue(V val);
}