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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.collections;
import java.util.Objects;
/**
* An immutable pair of objects. This implements equals and hashCode by delegating to the
* pair objects.
*
* @author bratseth
*/
public class Pair<F, S> {
/** The first member for the pair. May be null. */
private final F first;
/** The second member for the pair. May be null. */
private final S second;
/** Creates a pair. Each member may be set to null. */
public Pair(final F first, final S second) {
this.first = first;
this.second = second;
}
/** Returns the first member. This may be null. */
public F getFirst() { return first; }
/** Returns the second member. This may be null. */
public S getSecond() { return second; }
@Override
public int hashCode() {
return ( first != null ? first.hashCode() : 0 ) +
( second != null ? 17*second.hashCode() : 0) ;
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (!(o instanceof Pair)) return false;
@SuppressWarnings("rawtypes")
Pair other = (Pair) o;
return Objects.equals(this.first, other.first) && Objects.equals(this.second, other.second);
}
@Override
public String toString() {
return "(" + first + ", " + second + ")";
}
}
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