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authorBenjamin J. Culkin <bjculkin@mix.wvu.edu>2017-10-08 22:39:59 -0300
committerBenjamin J. Culkin <bjculkin@mix.wvu.edu>2017-10-08 22:39:59 -0300
commitc82e3b3b2de0633317ec8fc85925e91422820597 (patch)
tree96567416ce23c5ce85601f9cedc3a94bb1c55cba /BJC-Utils2/src/main/java/bjc/utils/data/Either.java
parentb3ac1c8690c3e14c879913e5dcc03a5f5e14876e (diff)
Start splitting into maven modules
Diffstat (limited to 'BJC-Utils2/src/main/java/bjc/utils/data/Either.java')
-rw-r--r--BJC-Utils2/src/main/java/bjc/utils/data/Either.java173
1 files changed, 0 insertions, 173 deletions
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/Either.java b/BJC-Utils2/src/main/java/bjc/utils/data/Either.java
deleted file mode 100644
index 36b3324..0000000
--- a/BJC-Utils2/src/main/java/bjc/utils/data/Either.java
+++ /dev/null
@@ -1,173 +0,0 @@
-package bjc.utils.data;
-
-import java.util.function.BiFunction;
-import java.util.function.Function;
-
-/**
- * Represents a pair where only one side has a value
- *
- * @author ben
- * @param <LeftType>
- * The type that could be on the left
- * @param <RightType>
- * The type that could be on the right
- *
- */
-public class Either<LeftType, RightType> implements IPair<LeftType, RightType> {
- /**
- * Create a new either with the left value occupied
- *
- * @param <LeftType>
- * The type of the left value
- * @param <RightType>
- * The type of the empty right value
- * @param left
- * The value to put on the left
- * @return An either with the left side occupied
- */
- public static <LeftType, RightType> Either<LeftType, RightType> left(final LeftType left) {
- return new Either<>(left, null);
- }
-
- /**
- * Create a new either with the right value occupied
- *
- * @param <LeftType>
- * The type of the empty left value
- * @param <RightType>
- * The type of the right value
- * @param right
- * The value to put on the right
- * @return An either with the right side occupied
- */
- public static <LeftType, RightType> Either<LeftType, RightType> right(final RightType right) {
- return new Either<>(null, right);
- }
-
- private LeftType leftVal;
-
- private RightType rightVal;
-
- private boolean isLeft;
-
- private Either(final LeftType left, final RightType right) {
- if (left == null) {
- rightVal = right;
- } else {
- leftVal = left;
-
- isLeft = true;
- }
- }
-
- @Override
- public <BoundLeft, BoundRight> IPair<BoundLeft, BoundRight> bind(
- final BiFunction<LeftType, RightType, IPair<BoundLeft, BoundRight>> binder) {
- if (binder == null) throw new NullPointerException("Binder must not be null");
-
- return binder.apply(leftVal, rightVal);
- }
-
- @Override
- public <BoundLeft> IPair<BoundLeft, RightType> bindLeft(
- final Function<LeftType, IPair<BoundLeft, RightType>> leftBinder) {
- if (leftBinder == null) throw new NullPointerException("Left binder must not be null");
-
- if (isLeft) return leftBinder.apply(leftVal);
-
- return new Either<>(null, rightVal);
- }
-
- @Override
- public <BoundRight> IPair<LeftType, BoundRight> bindRight(
- final Function<RightType, IPair<LeftType, BoundRight>> rightBinder) {
- if (rightBinder == null) throw new NullPointerException("Right binder must not be null");
-
- if (isLeft) return new Either<>(leftVal, null);
-
- return rightBinder.apply(rightVal);
- }
-
- @Override
- public <OtherLeft, OtherRight, CombinedLeft, CombinedRight> IPair<CombinedLeft, CombinedRight> combine(
- final IPair<OtherLeft, OtherRight> otherPair,
- final BiFunction<LeftType, OtherLeft, CombinedLeft> leftCombiner,
- final BiFunction<RightType, 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");
-
- if (isLeft) return otherPair.bind((otherLeft, otherRight) -> {
- return new Either<>(leftCombiner.apply(leftVal, otherLeft), null);
- });
-
- return otherPair.bind((otherLeft, otherRight) -> {
- return new Either<>(null, rightCombiner.apply(rightVal, otherRight));
- });
- }
-
- @Override
- public <NewLeft> IPair<NewLeft, RightType> mapLeft(final Function<LeftType, NewLeft> mapper) {
- if (mapper == null) throw new NullPointerException("Mapper must not be null");
-
- if (isLeft) return new Either<>(mapper.apply(leftVal), null);
-
- return new Either<>(null, rightVal);
- }
-
- @Override
- public <NewRight> IPair<LeftType, NewRight> mapRight(final Function<RightType, NewRight> mapper) {
- if (mapper == null) throw new NullPointerException("Mapper must not be null");
-
- if (isLeft) return new Either<>(leftVal, null);
-
- return new Either<>(null, mapper.apply(rightVal));
- }
-
- @Override
- public <MergedType> MergedType merge(final BiFunction<LeftType, RightType, MergedType> merger) {
- if (merger == null) throw new NullPointerException("Merger must not be null");
-
- return merger.apply(leftVal, rightVal);
- }
-
- @Override
- public int hashCode() {
- final int prime = 31;
-
- int result = 1;
- result = prime * result + (isLeft ? 1231 : 1237);
- result = prime * result + (leftVal == null ? 0 : leftVal.hashCode());
- result = prime * result + (rightVal == null ? 0 : rightVal.hashCode());
-
- return result;
- }
-
- @Override
- public boolean equals(final Object obj) {
- if (this == obj) return true;
- if (obj == null) return false;
- if (!(obj instanceof Either<?, ?>)) return false;
-
- final Either<?, ?> other = (Either<?, ?>) obj;
-
- if (isLeft != other.isLeft) return false;
-
- if (leftVal == null) {
- if (other.leftVal != null) return false;
- } else if (!leftVal.equals(other.leftVal)) return false;
-
- if (rightVal == null) {
- if (other.rightVal != null) return false;
- } else if (!rightVal.equals(other.rightVal)) return false;
-
- return true;
- }
-
- @Override
- public String toString() {
- return String.format("Either [leftVal='%s', rightVal='%s', isLeft=%s]", leftVal, rightVal, isLeft);
- }
-} \ No newline at end of file