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Java example source code file (Relationship.java)

This example Java source code file (Relationship.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

geq, leq, override, relationship, string

The Relationship.java Java example source code

/*
 * 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.math3.optim.linear;

/**
 * Types of relationships between two cells in a Solver {@link LinearConstraint}.
 *
 * @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.
     */
    Relationship(String stringValue) {
        this.stringValue = stringValue;
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return stringValue;
    }

    /**
     * Gets the relationship obtained when multiplying all coefficients by -1.
     *
     * @return the opposite relationship.
     */
    public Relationship oppositeRelationship() {
        switch (this) {
        case LEQ :
            return GEQ;
        case GEQ :
            return LEQ;
        default :
            return EQ;
        }
    }
}

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