/*
* Copyright (c) 2014 Evolveum
*
* 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 com.evolveum.midpoint.prism.delta;
/**
* Simple enumeration that refers to the plus, minus or zero concepts
* used in delta set triples.
*
* @author Radovan Semancik
*
*/
public enum PlusMinusZero {
PLUS, MINUS, ZERO;
public static PlusMinusZero compute(PlusMinusZero mode1, PlusMinusZero mode2) {
if (mode1 == null || mode2 == null) {
return null;
}
switch (mode1) {
case PLUS: switch (mode2) {
case PLUS: return PlusMinusZero.PLUS;
case ZERO: return PlusMinusZero.PLUS;
case MINUS: return null;
}
case ZERO: switch (mode2) {
case PLUS: return PlusMinusZero.PLUS;
case ZERO: return PlusMinusZero.ZERO;
case MINUS: return PlusMinusZero.MINUS;
}
case MINUS: switch (mode2) {
case PLUS: return null;
case ZERO: return PlusMinusZero.MINUS;
case MINUS: return PlusMinusZero.MINUS;
}
}
// notreached
throw new IllegalStateException();
}
}