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package bjc.utils.data;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.Function;
/**
* Represents a pair of values
*
* @author ben
* @param <LeftType>
* The type of the left side of the pair
* @param <RightType>
* The type of the right side of the pair
*
*/
public interface IPair<LeftType, RightType> {
/**
* Bind a function to the left value in this pair
*
* @param <BoundLeft>
* The type of the bound value
* @param leftBinder
* The function to use to bind
* @return A pair with the left type bound
*/
public <BoundLeft> IPair<BoundLeft, RightType> bindLeft(
Function<LeftType, IPair<BoundLeft, RightType>> leftBinder);
/**
* Bind a function to the right value in this pair
*
* @param <BoundRight>
* The type of the bound value
* @param rightBinder
* The function to use to bind
* @return A pair with the right type bound
*/
public <BoundRight> IPair<LeftType, BoundRight> bindRight(
Function<RightType, IPair<LeftType, BoundRight>> rightBinder);
/**
* Bind a function across the values in this pair
*
* @param <BoundLeft>
* The type of the bound left
* @param <BoundRight>
* The type of the bound right
* @param binder
* The function to bind with
* @return The bound pair
*/
public <BoundLeft, BoundRight> IPair<BoundLeft, BoundRight> bind(
BiFunction<LeftType, RightType, IPair<BoundLeft, BoundRight>> binder);
/**
* Merge the two values in this pair into a single value
*
* @param <MergedType>
* The type of the single value
* @param merger
* The function to use for merging
* @return The pair, merged into a single value
*/
public <MergedType> MergedType merge(
BiFunction<LeftType, RightType, MergedType> merger);
/**
* Get the value on the left side of the pair
*
* @return The value on the left side of the pair
*/
public default LeftType getLeft() {
return merge((leftValue, rightValue) -> leftValue);
}
/**
* Get the value on the right side of the pair
*
* @return The value on the right side of the pair
*/
public default RightType getRight() {
return merge((leftValue, rightValue) -> rightValue);
}
/**
* Immediately perfom the specified action with the contents of this
* pair
*
* @param consumer
* The action to perform on the pair
*/
public default void doWith(BiConsumer<LeftType, RightType> consumer) {
merge((leftValue, rightValue) -> {
consumer.accept(leftValue, rightValue);
return null;
});
}
}
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