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 | 55 |
1 files changed, 35 insertions, 20 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 index 622bd2e..2b3fb29 100644 --- a/BJC-Utils2/src/main/java/bjc/utils/data/BoundLazyPair.java +++ b/BJC-Utils2/src/main/java/bjc/utils/data/BoundLazyPair.java @@ -4,23 +4,38 @@ 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> { - private Supplier< - OldLeft> leftSupplier; - private Supplier< - OldRight> rightSupplier; - + /* + * 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; - private IPair<NewLeft, - NewRight> boundPair; + /* + * 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) { + Supplier<OldRight> rightSupp, + BiFunction<OldLeft, OldRight, IPair<NewLeft, NewRight>> bindr) { leftSupplier = leftSupp; rightSupplier = rightSupp; binder = bindr; @@ -28,10 +43,13 @@ class BoundLazyPair<OldLeft, OldRight, NewLeft, NewRight> @Override public <BoundLeft, BoundRight> IPair<BoundLeft, BoundRight> bind( - BiFunction<NewLeft, NewRight, - IPair<BoundLeft, BoundRight>> bindr) { - IHolder<IPair<NewLeft, - NewRight>> newPair = new Identity<>(boundPair); + 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 = () -> { @@ -94,13 +112,10 @@ class BoundLazyPair<OldLeft, OldRight, NewLeft, NewRight> } @Override - public <OtherLeft, OtherRight, CombinedLeft, - CombinedRight> IPair<CombinedLeft, CombinedRight> combine( - IPair<OtherLeft, OtherRight> otherPair, - BiFunction<NewLeft, OtherLeft, - CombinedLeft> leftCombiner, - BiFunction<NewRight, OtherRight, - CombinedRight> rightCombiner) { + public <OtherLeft, OtherRight, CombinedLeft, CombinedRight> IPair<CombinedLeft, CombinedRight> combine( + IPair<OtherLeft, OtherRight> otherPair, + BiFunction<NewLeft, OtherLeft, CombinedLeft> leftCombiner, + BiFunction<NewRight, OtherRight, CombinedRight> rightCombiner) { return otherPair.bind((otherLeft, otherRight) -> { return bind((leftVal, rightVal) -> { return new LazyPair<>( |