diff options
Diffstat (limited to 'BJC-Utils2/src/main/java/bjc/utils/data/BoundLazyPair.java')
| -rw-r--r-- | BJC-Utils2/src/main/java/bjc/utils/data/BoundLazyPair.java | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/BoundLazyPair.java b/BJC-Utils2/src/main/java/bjc/utils/data/BoundLazyPair.java deleted file mode 100644 index c7eb965..0000000 --- a/BJC-Utils2/src/main/java/bjc/utils/data/BoundLazyPair.java +++ /dev/null @@ -1,236 +0,0 @@ -package bjc.utils.data; - -import java.util.function.BiFunction; -import java.util.function.Function; -import java.util.function.Supplier; - -/** - * Implements a lazy pair that has been bound - */ -class BoundLazyPair<OldLeft, OldRight, NewLeft, NewRight> - implements IPair<NewLeft, NewRight> { - /* - * The supplier of the left value - */ - private Supplier<OldLeft> leftSupplier; - /* - * The supplier of the right value - */ - private Supplier<OldRight> rightSupplier; - - /* - * The binder to transform values - */ - private BiFunction<OldLeft, OldRight, IPair<NewLeft, NewRight>> binder; - - /* - * The bound pair - */ - private IPair<NewLeft, NewRight> boundPair; - - /* - * Whether the pair has been bound yet - */ - private boolean pairBound; - - public BoundLazyPair(Supplier<OldLeft> leftSupp, - Supplier<OldRight> rightSupp, - BiFunction<OldLeft, OldRight, IPair<NewLeft, NewRight>> bindr) { - leftSupplier = leftSupp; - rightSupplier = rightSupp; - binder = bindr; - } - - @Override - public <BoundLeft, BoundRight> IPair<BoundLeft, BoundRight> bind( - BiFunction<NewLeft, NewRight, IPair<BoundLeft, BoundRight>> bindr) { - if (bindr == null) { - throw new NullPointerException("Binder must not be null"); - } - - IHolder<IPair<NewLeft, NewRight>> newPair = new Identity<>( - boundPair); - IHolder<Boolean> newPairMade = new Identity<>(pairBound); - - Supplier<NewLeft> leftSupp = () -> { - if (!newPairMade.getValue()) { - newPair.replace(binder.apply(leftSupplier.get(), - rightSupplier.get())); - - newPairMade.replace(true); - } - - return newPair.unwrap((pair) -> pair.getLeft()); - }; - - Supplier<NewRight> rightSupp = () -> { - if (!newPairMade.getValue()) { - newPair.replace(binder.apply(leftSupplier.get(), - rightSupplier.get())); - - newPairMade.replace(true); - } - - return newPair.unwrap((pair) -> pair.getRight()); - }; - - return new BoundLazyPair<>(leftSupp, rightSupp, bindr); - } - - @Override - public <BoundLeft> IPair<BoundLeft, NewRight> bindLeft( - Function<NewLeft, IPair<BoundLeft, NewRight>> leftBinder) { - if (leftBinder == null) { - throw new NullPointerException("Left binder must not be null"); - } - - Supplier<NewLeft> leftSupp = () -> { - IPair<NewLeft, NewRight> newPair = boundPair; - - if (!pairBound) { - newPair = binder.apply(leftSupplier.get(), - rightSupplier.get()); - } - - return newPair.getLeft(); - }; - - return new HalfBoundLazyPair<>(leftSupp, leftBinder); - } - - @Override - public <BoundRight> IPair<NewLeft, BoundRight> bindRight( - Function<NewRight, IPair<NewLeft, BoundRight>> rightBinder) { - if (rightBinder == null) { - throw new NullPointerException( - "Right binder must not be null"); - } - - Supplier<NewRight> rightSupp = () -> { - IPair<NewLeft, NewRight> newPair = boundPair; - - if (!pairBound) { - newPair = binder.apply(leftSupplier.get(), - rightSupplier.get()); - } - - return newPair.getRight(); - }; - - return new HalfBoundLazyPair<>(rightSupp, rightBinder); - } - - @Override - public <OtherLeft, OtherRight, CombinedLeft, CombinedRight> IPair<CombinedLeft, CombinedRight> combine( - IPair<OtherLeft, OtherRight> otherPair, - BiFunction<NewLeft, OtherLeft, CombinedLeft> leftCombiner, - BiFunction<NewRight, OtherRight, CombinedRight> rightCombiner) { - if (otherPair == null) { - throw new NullPointerException("Other pair must not be null"); - } else if (leftCombiner == null) { - throw new NullPointerException( - "Left combiner must not be null"); - } else if (rightCombiner == null) { - throw new NullPointerException( - "Right combiner must not be null"); - } - - return otherPair.bind((otherLeft, otherRight) -> { - return bind((leftVal, rightVal) -> { - return new LazyPair<>( - leftCombiner.apply(leftVal, otherLeft), - rightCombiner.apply(rightVal, otherRight)); - }); - }); - } - - @Override - public <NewLeftType> IPair<NewLeftType, NewRight> mapLeft( - Function<NewLeft, NewLeftType> mapper) { - if (mapper == null) { - throw new NullPointerException("Mapper must not be null"); - } - - Supplier<NewLeftType> leftSupp = () -> { - if (!pairBound) { - NewLeft leftVal = binder - .apply(leftSupplier.get(), rightSupplier.get()) - .getLeft(); - - return mapper.apply(leftVal); - } - - return mapper.apply(boundPair.getLeft()); - }; - - Supplier<NewRight> rightSupp = () -> { - if (!pairBound) { - return binder - .apply(leftSupplier.get(), rightSupplier.get()) - .getRight(); - } - - return boundPair.getRight(); - }; - - return new LazyPair<>(leftSupp, rightSupp); - } - - @Override - public <NewRightType> IPair<NewLeft, NewRightType> mapRight( - Function<NewRight, NewRightType> mapper) { - if (mapper == null) { - throw new NullPointerException("Mapper must not be null"); - } - - Supplier<NewLeft> leftSupp = () -> { - if (!pairBound) { - return binder - .apply(leftSupplier.get(), rightSupplier.get()) - .getLeft(); - } - - return boundPair.getLeft(); - }; - - Supplier<NewRightType> rightSupp = () -> { - if (!pairBound) { - NewRight rightVal = binder - .apply(leftSupplier.get(), rightSupplier.get()) - .getRight(); - - return mapper.apply(rightVal); - } - - return mapper.apply(boundPair.getRight()); - }; - - return new LazyPair<>(leftSupp, rightSupp); - } - - @Override - public <MergedType> MergedType merge( - BiFunction<NewLeft, NewRight, MergedType> merger) { - if (merger == null) { - throw new NullPointerException("Merger must not be null"); - } - - if (!pairBound) { - boundPair = binder.apply(leftSupplier.get(), - rightSupplier.get()); - - pairBound = true; - } - - return boundPair.merge(merger); - } - - @Override - public String toString() { - if (pairBound) { - return boundPair.toString(); - } - - return "(un-materialized)"; - } -}
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