Pair.java

package at.ac.univie.mminf.qskos4j.util;

public class Pair<T> {

    private T first, second;

    public Pair(T first, T second) {
        this.first = first;
        this.second = second;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof Pair) {
            Pair<?> other = (Pair<?>) obj;

            return (first.equals(other.first) && second.equals(other.second)) ||
                    (first.equals(other.second) && second.equals(other.first));
        }
        return false;
    }

    public int hashCode() {
        int hashFirst = first != null ? first.hashCode() : 0;
        int hashSecond = second != null ? second.hashCode() : 0;

        return hashFirst + hashSecond;
    }

    @Override
    public String toString() {
        return "("+first.toString() +", "+ second.toString() +")";
    }

    public T getFirst() {
        return first;
    }

    public T getSecond() {
        return second;
    }

}