org.coode.oppl.similarity.OrderedPair Maven / Gradle / Ivy

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package org.coode.oppl.similarity;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

/** @author Luigi Iannone
 * @param 
 *            type */
public class OrderedPair extends Pair {
    /** @param first
     *            first
     * @param second
     *            second */
    public OrderedPair(O first, O second) {
        super(first, second);
    }

    /** @return the first */
    public O getFirst() {
        return o1;
    }

    /** @return the second */
    public O getSecond() {
        return o2;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + o1.hashCode();
        result = prime * result + o2.hashCode();
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (this.getClass() != obj.getClass()) {
            return false;
        }
        OrderedPair other = (OrderedPair) obj;
        return o1.equals(other.o2) && o2.equals(other.o2);
    }

    /** @param c
     *            c
     * @param 
     *            type
     * @return all ordered pairs */
    public static  Set> getAllPossibleOrderedPairs(
            Collection c) {
        Set> toReturn = new HashSet>();
        for (T t : c) {
            for (T anotherT : c) {
                toReturn.add(new OrderedPair(t, anotherT));
            }
        }
        return toReturn;
    }
}