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rx-java Observables for jdbc

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package com.github.davidmoten.rx.jdbc.tuple;

/**
 * An explicitly typed tuple.
 * 
 * @param 
 * @param 
 */
public class Tuple2 {

    private final T1 value1;
    private final T2 value2;

    /**
     * Constructor.
     * 
     * @param value1
     * @param value2
     */
    public Tuple2(T1 value1, T2 value2) {
        this.value1 = value1;
        this.value2 = value2;
    }

    /**
     * Returns a new instance.
     * 
     * @param r
     * @param s
     * @return
     */
    public static  Tuple2 create(R r, S s) {
        return new Tuple2(r, s);
    }

    /**
     * Returns the first member of the tuple.
     * 
     * @return
     */
    public T1 value1() {
        return value1;
    }

    /**
     * Returns the first member of the tuple.
     * 
     * @return
     */
    public T1 _1() {
        return value1;
    }

    /**
     * Returns the 2nd member of the tuple.
     * 
     * @return
     */
    public T2 value2() {
        return value2;
    }

    /**
     * Returns the 2nd member of the tuple.
     * 
     * @return
     */
    public T2 _2() {
        return value2;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((value1 == null) ? 0 : value1.hashCode());
        result = prime * result + ((value2 == null) ? 0 : value2.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Tuple2 other = (Tuple2) obj;
        if (value1 == null) {
            if (other.value1 != null)
                return false;
        } else if (!value1.equals(other.value1))
            return false;
        if (value2 == null) {
            if (other.value2 != null)
                return false;
        } else if (!value2.equals(other.value2))
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "Tuple2 [value1=" + value1 + ", value2=" + value2 + "]";
    }

}