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/*******************************************************************************
* Copyright (c) 2010-2019, Tamas Szabo, itemis AG, Gabor Bergmann, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.util;
/**
* Indicates whether a propagated update event signals the insertion or deletion of an element
*
* @author Gabor Bergmann
*/
public enum Direction {
INSERT, DELETE;
/**
* @since 2.4
*/
public Direction opposite() {
switch (this) {
case INSERT:
return DELETE;
default:
return INSERT;
}
}
/**
* @since 2.4
*/
public char asSign() {
switch (this) {
case INSERT:
return '+';
default:
return '-';
}
}
/**
* Returns the direction that is the product of this direction and the other direction.
*
* DELETE x DELETE = INSERT
* DELETE x INSERT = DELETE
* INSERT x DELETE = DELETE
* INSERT x INSERT = INSERT
* @since 2.4
*/
public Direction multiply(final Direction other) {
switch (this) {
case DELETE:
return other.opposite();
default:
return other;
}
}
}
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