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Diffstat (limited to 'src/main/java/org/apache/commons/math/optimization/linear/Relationship.java')
-rw-r--r-- | src/main/java/org/apache/commons/math/optimization/linear/Relationship.java | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math/optimization/linear/Relationship.java b/src/main/java/org/apache/commons/math/optimization/linear/Relationship.java new file mode 100644 index 0000000..500dcc1 --- /dev/null +++ b/src/main/java/org/apache/commons/math/optimization/linear/Relationship.java @@ -0,0 +1,67 @@ +/* + * 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; + } + } + +} |