Raymond | dee0849 | 2015-04-02 10:43:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
| 3 | * contributor license agreements. See the NOTICE file distributed with |
| 4 | * this work for additional information regarding copyright ownership. |
| 5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
| 6 | * (the "License"); you may not use this file except in compliance with |
| 7 | * the License. You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | package org.apache.commons.math.optimization.linear; |
| 19 | |
| 20 | /** |
| 21 | * Types of relationships between two cells in a Solver {@link LinearConstraint}. |
| 22 | * @version $Revision: 1003886 $ $Date: 2010-10-02 23:04:44 +0200 (sam. 02 oct. 2010) $ |
| 23 | * @since 2.0 |
| 24 | */ |
| 25 | public enum Relationship { |
| 26 | |
| 27 | /** Equality relationship. */ |
| 28 | EQ("="), |
| 29 | |
| 30 | /** Lesser than or equal relationship. */ |
| 31 | LEQ("<="), |
| 32 | |
| 33 | /** Greater than or equal relationship. */ |
| 34 | GEQ(">="); |
| 35 | |
| 36 | /** Display string for the relationship. */ |
| 37 | private final String stringValue; |
| 38 | |
| 39 | /** Simple constructor. |
| 40 | * @param stringValue display string for the relationship |
| 41 | */ |
| 42 | private Relationship(String stringValue) { |
| 43 | this.stringValue = stringValue; |
| 44 | } |
| 45 | |
| 46 | /** {@inheritDoc} */ |
| 47 | @Override |
| 48 | public String toString() { |
| 49 | return stringValue; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Get the relationship obtained when multiplying all coefficients by -1. |
| 54 | * @return relationship obtained when multiplying all coefficients by -1 |
| 55 | */ |
| 56 | public Relationship oppositeRelationship() { |
| 57 | switch (this) { |
| 58 | case LEQ : |
| 59 | return GEQ; |
| 60 | case GEQ : |
| 61 | return LEQ; |
| 62 | default : |
| 63 | return EQ; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | } |