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TernaryComparator.java
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TernaryComparator.java
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/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.values;
/**
* Comparator that allows undefined comparison.
*/
@FunctionalInterface
public interface TernaryComparator<T>
{
/**
* Should return a negative integer if o1 is smaller than o2,
* a positive integer if o1 is bigger than o2,
* 0 if o1 and o2 are equal, and
* {@code null} if they are not comparable.
*/
Comparison ternaryCompare( T o1, T o2 );
}