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Pipes is a dataflow framework written in Java that enables the splitting, merging, filtering, and transformation of data from input to output. Computations are expressed using a combinator model and are evaluated in a memory-efficient, lazy fashion.

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package com.tinkerpop.pipes.util.structures;

/**
 * A pair of objects.
 *
 * @author Marko A. Rodriguez (http://markorodriguez.com)
 */
public class Pair {

    private final A a;
    private final B b;

    public Pair(final A a, final B b) {

        this.a = a;
        this.b = b;
    }

    public A getA() {
        return a;
    }

    public B getB() {
        return b;
    }

    public boolean equals(Object object) {
        return (object.getClass().equals(Pair.class) && ((Pair) object).getA().equals(this.a) && ((Pair) object).getB().equals(this.b));
    }
}