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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.commons.math.optimization.linear;
/**
* Types of relationships between two cells in a Solver {@link LinearConstraint}.
* @version $Revision: 1003886 $ $Date: 2010-10-02 23:04:44 +0200 (sam. 02 oct. 2010) $
* @since 2.0
*/
public enum Relationship {
/** Equality relationship. */
EQ("="),
/** Lesser than or equal relationship. */
LEQ("<="),
/** Greater than or equal relationship. */
GEQ(">=");
/** Display string for the relationship. */
private final String stringValue;
/** Simple constructor.
* @param stringValue display string for the relationship
*/
private Relationship(String stringValue) {
this.stringValue = stringValue;
}
/** {@inheritDoc} */
@Override
public String toString() {
return stringValue;
}
/**
* Get the relationship obtained when multiplying all coefficients by -1.
* @return relationship obtained when multiplying all coefficients by -1
*/
public Relationship oppositeRelationship() {
switch (this) {
case LEQ :
return GEQ;
case GEQ :
return LEQ;
default :
return EQ;
}
}
}
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