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package bjc.utils.data;
import java.util.function.BiFunction;
import java.util.function.Function;
/**
* Holds a pair of values of two different types.
*
* @author ben
*
* @param <L>
* The type of the thing held on the left (first)
* @param <R>
* The type of the thing held on the right (second)
*/
public class Pair<L, R> {
/**
* The left value of the pair
*/
public L l;
/**
* The right value of the pair
*/
public R r;
/**
* Create a new pair that holds two nulls.
*/
public Pair() {
}
/**
* Create a new pair holding the specified values.
*
* @param left
* The value to hold on the left.
* @param right
* The value to hold on the right.
*/
public Pair(L left, R right) {
l = left;
r = right;
}
/**
* Create a new pair by applying the given functions to the left/right.
* Does not change the internal contents of this pair.
*
* @param lf
* The function to apply to the left value.
* @param rf
* The function to apply to the right value.
* @return A new pair containing the two modified values.
*/
public <L2, R2> Pair<L2, R2> apply(Function<L, L2> lf,
Function<R, R2> rf) {
return new Pair<L2, R2>(lf.apply(l), rf.apply(r));
}
/**
* Collapse this pair to a single value. Does not change the internal
* contents of this pair.
*
* @param bf
* The function to use to collapse the pair.
* @return The collapsed value.
*/
public <E> E merge(BiFunction<L, R, E> bf) {
return bf.apply(l, r);
}
}
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