[1] | 1 | package agents.anac.y2011.IAMhaggler2011;
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| 2 | import java.io.Serializable;
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| 3 |
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| 4 | public class Pair<A, B> implements Serializable {
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| 5 |
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| 6 | private static final long serialVersionUID = -3160841691791187933L;
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| 7 | public final A fst;
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| 8 | public final B snd;
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| 9 |
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| 10 | /**
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| 11 | * @param fst
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| 12 | * First value.
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| 13 | * @param snd
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| 14 | * Second value.
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| 15 | */
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| 16 | public Pair(A fst, B snd) {
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| 17 | this.fst = fst;
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| 18 | this.snd = snd;
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| 19 | }
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| 20 |
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| 21 | /*
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| 22 | * (non-Javadoc)
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| 23 | *
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| 24 | * @see java.lang.Object#toString()
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| 25 | */
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| 26 | public String toString() {
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| 27 | return "Pair[" + fst + "," + snd + "]";
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| 28 | }
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| 29 |
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| 30 | /*
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| 31 | * (non-Javadoc)
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| 32 | *
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| 33 | * @see java.lang.Object#equals(java.lang.Object)
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| 34 | */
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| 35 | public boolean equals(Object other) {
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| 36 | return other instanceof Pair<?, ?> && equals(fst, ((Pair<?, ?>) other).fst) && equals(snd, ((Pair<?, ?>) other).snd);
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| 37 | }
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| 38 |
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| 39 | private static boolean equals(Object x, Object y) {
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| 40 | return (x == null && y == null) || (x != null && x.equals(y));
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| 41 | }
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| 42 |
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| 43 | /*
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| 44 | * (non-Javadoc)
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| 45 | *
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| 46 | * @see java.lang.Object#hashCode()
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| 47 | */
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| 48 | public int hashCode() {
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| 49 | if (fst == null)
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| 50 | return (snd == null) ? 0 : snd.hashCode() + 1;
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| 51 | else if (snd == null)
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| 52 | return fst.hashCode() + 2;
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| 53 | else
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| 54 | return fst.hashCode() * 17 + snd.hashCode();
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| 55 | }
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| 56 |
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| 57 | public static <A, B> Pair<A, B> of(A a, B b) {
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| 58 | return new Pair<A, B>(a, b);
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| 59 | }
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| 60 | } |
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