variable.java

This is my implementation for linear programming

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package ro.simplex;

import ro.utils.Fraction;

/**
 *
 * @author Doan Chien Thang
 */
public class Variable {
    private int constraint;
    private Fraction value;
    private int index;
    private String prefix;

    public Variable(Fraction initValue, int initIndex,
            String initPrefix, int constraint) {
        this.value = initValue;
        this.index = initIndex;
        this.prefix = initPrefix;
        this.constraint = constraint;
        this.value = null;
    }

    @Override
    public String toString() {
        return prefix + "<sub>" + index + "</sub>";
    }

    public Fraction getValue() {
        return this.value;
    }

    public int getConstraint() {
        return constraint;
    }

    public int getIndex() {
        return index;
    }

    public String getConstraintString() {
        String result = this.toString();
        switch (this.constraint) {
            case ConstraintTypes.GREATER_THAN:
                result += " &ge; 0";
                break;
            case ConstraintTypes.LESS_THAN:
                result += " &le; 0";
                break;
            case ConstraintTypes.BELONG_R:
                result += " &isin; R";
                break;
            default:
                break;
        }
        return result;
    }

    public String getPrefix() {
        return prefix;
    }

    public boolean equals(Variable variable) {
        return (prefix.compareTo(variable.getPrefix()) == 0 &&
                index == variable.getIndex());
    }

    public void setValue(Fraction value) {
        this.value = value;
    }
}