com.sap.it.commons.data.Pair Maven / Gradle / Ivy

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package com.sap.it.commons.data;

import java.io.Serializable;

import com.sap.it.commons.lang.Equals;
import com.sap.it.commons.lang.Hash;

public class Pair implements Serializable {
    private static final long serialVersionUID = 8719382431393826469L;

    private final T first;
    private final U second;

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

    public T getFirst() {
        return first;
    }

    public U getSecond() {
        return second;
    }

    @Override
    public int hashCode() {
        return Hash.hash(first, second);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (!(obj instanceof Pair)) {
            return false;
        }

        @SuppressWarnings("unchecked")
        Pair other = (Pair) obj;

        return Equals.equals(first, other.first) && //
                Equals.equals(second, other.second);
    }

    @Override
    public String toString() {
        return "[" + first + ", " + second + "]"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
    }

    public static  Pair create(T a, U b) {
        return new Pair(a, b);
    }

    @SuppressWarnings("unchecked")
    public static final  Pair nullPair() {
        return (Pair) NULL_PAIR;
    }

    @SuppressWarnings("rawtypes")
    public static final Pair NULL_PAIR = new Pair(null, null);
}