From 002516bd03b2ea3f731c8139c9a5f716902ab702 Mon Sep 17 00:00:00 2001 From: Ben Culkin Date: Tue, 7 Apr 2020 21:03:53 -0400 Subject: Finish remove utils.data utils.data now lives in the esodata project; not in this one --- base/src/main/java/bjc/utils/data/LazyPair.java | 249 ------------------------ 1 file changed, 249 deletions(-) delete mode 100644 base/src/main/java/bjc/utils/data/LazyPair.java (limited to 'base/src/main/java/bjc/utils/data/LazyPair.java') diff --git a/base/src/main/java/bjc/utils/data/LazyPair.java b/base/src/main/java/bjc/utils/data/LazyPair.java deleted file mode 100644 index 0500486..0000000 --- a/base/src/main/java/bjc/utils/data/LazyPair.java +++ /dev/null @@ -1,249 +0,0 @@ -package bjc.utils.data; - -import java.util.function.BiFunction; -import java.util.function.Function; -import java.util.function.Supplier; - -import bjc.utils.data.internals.BoundLazyPair; -import bjc.utils.data.internals.HalfBoundLazyPair; - -/** - * A lazy implementation of a pair. - * - * @author ben - * - * @param - * The type on the left side of the pair. - * - * @param - * The type on the right side of the pair. - */ -public class LazyPair implements IPair { - /* The supplier for the left value. */ - private Supplier leftSupplier; - /* The left value. */ - private LeftType leftValue; - /* Whether the left value has been created. */ - private boolean leftMaterialized; - - /* The supplier for the right value. */ - private Supplier rightSupplier; - /* The right value. */ - private RightType rightValue; - /* Whether the right value has been created. */ - private boolean rightMaterialized; - - /** - * Create a new lazy pair, using the set values. - * - * @param leftVal - * The value for the left side of the pair. - * - * @param rightVal - * The value for the right side of the pair. - */ - public LazyPair(final LeftType leftVal, final RightType rightVal) { - leftValue = leftVal; - rightValue = rightVal; - - leftMaterialized = true; - rightMaterialized = true; - } - - /** - * Create a new lazy pair from the given value sources. - * - * @param leftSupp - * The source for a value on the left side of the pair. - * - * @param rightSupp - * The source for a value on the right side of the pair. - */ - public LazyPair(final Supplier leftSupp, final Supplier rightSupp) { - /* Use single suppliers to catch double-instantiation bugs. */ - leftSupplier = new SingleSupplier<>(leftSupp); - rightSupplier = new SingleSupplier<>(rightSupp); - - leftMaterialized = false; - rightMaterialized = false; - } - - @Override - public IPair bind( - final BiFunction> binder) { - return new BoundLazyPair<>(leftSupplier, rightSupplier, binder); - } - - @Override - public IPair bindLeft( - final Function> leftBinder) { - final Supplier leftSupp = () -> { - if(leftMaterialized) return leftValue; - - return leftSupplier.get(); - }; - - return new HalfBoundLazyPair<>(leftSupp, leftBinder); - } - - @Override - public IPair bindRight( - final Function> rightBinder) { - final Supplier rightSupp = () -> { - if(rightMaterialized) return rightValue; - - return rightSupplier.get(); - }; - - return new HalfBoundLazyPair<>(rightSupp, rightBinder); - } - - @Override - public IPair combine( - final IPair otherPair, - final BiFunction leftCombiner, - final BiFunction rightCombiner) { - return otherPair.bind((otherLeft, otherRight) -> { - return bind((leftVal, rightVal) -> { - final CombinedLeft left = leftCombiner.apply(leftVal, otherLeft); - final CombinedRight right = rightCombiner.apply(rightVal, otherRight); - - return new LazyPair<>(left, right); - }); - }); - } - - @Override - public LeftType getLeft() { - if(!leftMaterialized) { - leftValue = leftSupplier.get(); - - leftMaterialized = true; - } - - return leftValue; - } - - @Override - public RightType getRight() { - if(!rightMaterialized) { - rightValue = rightSupplier.get(); - - rightMaterialized = true; - } - - return rightValue; - } - - @Override - public IPair mapLeft(final Function mapper) { - final Supplier leftSupp = () -> { - if(leftMaterialized) return mapper.apply(leftValue); - - return mapper.apply(leftSupplier.get()); - }; - - final Supplier rightSupp = () -> { - if(rightMaterialized) return rightValue; - - return rightSupplier.get(); - }; - - return new LazyPair<>(leftSupp, rightSupp); - } - - @Override - public IPair mapRight(final Function mapper) { - final Supplier leftSupp = () -> { - if(leftMaterialized) return leftValue; - - return leftSupplier.get(); - }; - - final Supplier rightSupp = () -> { - if(rightMaterialized) return mapper.apply(rightValue); - - return mapper.apply(rightSupplier.get()); - }; - - return new LazyPair<>(leftSupp, rightSupp); - } - - @Override - public MergedType merge(final BiFunction merger) { - if(!leftMaterialized) { - leftValue = leftSupplier.get(); - - leftMaterialized = true; - } - - if(!rightMaterialized) { - rightValue = rightSupplier.get(); - - rightMaterialized = true; - } - - return merger.apply(leftValue, rightValue); - } - - @Override - public String toString() { - String leftVal; - String rightVal; - - if(leftMaterialized) { - leftVal = leftValue.toString(); - } else { - leftVal = "(un-materialized)"; - } - - if(rightMaterialized) { - rightVal = rightValue.toString(); - } else { - rightVal = "(un-materialized)"; - } - - return String.format("pair[l=%s,r=%s]", leftVal, rightVal); - } - - @Override - public int hashCode() { - final int prime = 31; - int result = 1; - - result = prime * result + (leftMaterialized ? 1231 : 1237); - result = prime * result + (leftValue == null ? 0 : leftValue.hashCode()); - result = prime * result + (rightMaterialized ? 1231 : 1237); - result = prime * result + (rightValue == null ? 0 : rightValue.hashCode()); - - return result; - } - - @Override - public boolean equals(final Object obj) { - if(this == obj) return true; - if(obj == null) return false; - if(!(obj instanceof LazyPair)) return false; - - final LazyPair other = (LazyPair) obj; - - if(leftMaterialized != other.leftMaterialized) return false; - - if(leftMaterialized) { - if(leftValue == null) { - if(other.leftValue != null) return false; - } else if(!leftValue.equals(other.leftValue)) return false; - } else - return false; - - if(rightMaterialized != other.rightMaterialized) return false; - if(rightMaterialized) { - if(rightValue == null) { - if(other.rightValue != null) return false; - } else if(!rightValue.equals(other.rightValue)) return false; - } else - return false; - - return true; - } -} -- cgit v1.2.3