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package org.coode.oppl.utils;

import java.util.Comparator;

import org.coode.oppl.Variable;

/** @author Luigi Iannone */
public class NameBasedVariableComparator implements Comparator> {
    private final static NameBasedVariableComparator INSTANCE = new NameBasedVariableComparator();

    private NameBasedVariableComparator() {}

    @Override
    public int compare(Variable aVariable, Variable anotherVariable) {
        int toReturn = 0;
        if (aVariable == null) {
            if (anotherVariable != null) {
                toReturn = -1;
            }
        } else if (anotherVariable == null) {
            toReturn = 1;
        } else {
            toReturn = aVariable.getName().compareTo(anotherVariable.getName());
            if (toReturn == 0) {
                toReturn = aVariable.getType().toString()
                        .compareTo(anotherVariable.getType().toString());
            }
        }
        return toReturn;
    }

    /** @return the instance */
    public static NameBasedVariableComparator getInstance() {
        return INSTANCE;
    }
}