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package Torello.Java.Additional;


/**
 * This simple generic-class allows a function to return <B STYLE='color:red'>two</B> objects as a
 * result, instead of just one.   This is not always so useful, and can make code confusing.
 * However there are some instances where the only alternative would be to create an entirely new 
 * class/object, when only a single method result would use that object.
 * 
 * <EMBED CLASS=globalDefs DATA-KIND=Ret DATA-N=2>
 * <EMBED CLASS='external-html' DATA-FILE-ID=IMMUTABLE_RET>
 * @param <A> The type of the <B STYLE='color:red'>first</B> member-field ('{@link #a}').
 * @param <B> The type of the <B STYLE='color:red'>second</B> member-field ('{@link #b}').
 */
public class Ret2<A, B>
    extends RetN
    implements java.io.Serializable, Cloneable
{
    /** <EMBED CLASS='external-html' DATA-FILE-ID=SVUID>  */
    protected static final long serialVersionUID = 1;

    /** This holds a pointer the first response object. */
    public final A a;

    /** This holds a pointer to the second response object. */
    public final B b;

    /** Constructs this object */
    public Ret2(A a, B b)
    {
        this.a = a;
        this.b = b;
    }

    /**
     * Returns {@code '2'}, indicating how many fields are declared by this class.
     * @return As an instance of {@code Ret2}, this method returns {@code '2'};
     */
    public int n() { return 2; }

    // Super-class uses this for toString, equals, and hashCode
    // There is an optimization, so if this is requested multiple times, it is saved in a
    // transient field.

    final Object[] asArrayInternal()
    { return new Object[] { a, b }; }

    public Ret2<A, B> clone()
    { return new Ret2<>(this.a, this.b); }

    /**
     * <EMBED CLASS=defs DATA-TEXT="Integer">
     * <EMBED CLASS='external-html' DATA-FILE-ID=MULTI_TYPE_EX_COMMON>
     * <EMBED CLASS='external-html' DATA-FILE-ID=MULTI_TYPE_GET_EXAMPLE>
     */
    public Object get(final int i)
    {
        // Throws Exception if i not 1 or 2
        CHECK_GET(i);
        return (i == 1) ? a : b;
    }

    public Tuple2<A, B> toModifiable()
    { return new Tuple2<>(this.a, this.b); }
}