82 lines
2.2 KiB
Java
82 lines
2.2 KiB
Java
package tc.oc.commons.core.util;
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import com.google.common.base.Objects;
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import java.util.function.BiConsumer;
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import java.util.function.BiFunction;
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/**
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* Container to ease passing around a tuple of two objects. This object provides a sensible
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* implementation of equals(), returning true if equals() is true on each of the contained
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* objects.
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*
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* http://stackoverflow.com/a/18586688/6342
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*/
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public class Pair<F, S> {
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public final F first;
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public final S second;
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/**
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* Constructor for a Pair.
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*
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* @param first the first object in the Pair
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* @param second the second object in the pair
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*/
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public Pair(F first, S second) {
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this.first = first;
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this.second = second;
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}
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public void feed(BiConsumer<F, S> block) {
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block.accept(first, second);
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}
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public <R> R transform(BiFunction<F, S, R> block) {
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return block.apply(first, second);
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}
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/**
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* Checks the two objects for equality by delegating to their respective
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* {@link Object#equals(Object)} methods.
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*
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* @param o the {@link Pair} to which this one is to be checked for equality
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* @return true if the underlying objects of the Pair are both considered
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* equal
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*/
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@Override
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public boolean equals(Object o) {
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if (!(o instanceof Pair)) {
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return false;
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}
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Pair<?, ?> p = (Pair<?, ?>) o;
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return Objects.equal(p.first, first) && Objects.equal(p.second, second);
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}
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/**
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* Compute a hash code using the hash codes of the underlying objects
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*
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* @return a hashcode of the Pair
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*/
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@Override
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public int hashCode() {
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return (first == null ? 0 : first.hashCode()) ^ (second == null ? 0 : second.hashCode());
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}
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/**
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* Convenience method for creating an appropriately typed pair.
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* @param a the first object in the Pair
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* @param b the second object in the pair
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* @return a Pair that is templatized with the types of a and b
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*/
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public static <A, B> Pair <A, B> create(A a, B b) {
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return new Pair<>(a, b);
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}
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/**
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* Alias for {@link #create(Object, Object)}
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*/
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public static <A, B> Pair <A, B> of(A a, B b) {
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return new Pair<>(a, b);
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}
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}
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