86 lines
2.8 KiB
Java
86 lines
2.8 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2024 ViaVersion and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package com.viaversion.viaversion.util;
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import com.google.common.base.Preconditions;
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import java.util.Objects;
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import org.checkerframework.checker.nullness.qual.Nullable;
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public final class Either<X, Y> {
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private final X left;
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private final Y right;
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private Either(final X left, final Y value) {
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this.left = left;
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this.right = value;
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Preconditions.checkArgument(left == null || value == null, "Either.left and Either.right are both present");
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}
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public static <X, Y> Either<X, Y> left(final X left) {
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Preconditions.checkNotNull(left);
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return new Either<>(left, null);
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}
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public static <X, Y> Either<X, Y> right(final Y right) {
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Preconditions.checkNotNull(right);
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return new Either<>(null, right);
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}
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public boolean isLeft() {
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return left != null;
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}
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public boolean isRight() {
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return right != null;
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}
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public @Nullable X left() {
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return left;
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}
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public @Nullable Y right() {
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return right;
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}
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@Override
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public String toString() {
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return "Either{" + left + ", " + right + '}';
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}
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@Override
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public boolean equals(final Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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final Either<?, ?> pair = (Either<?, ?>) o;
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if (!Objects.equals(left, pair.left)) return false;
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return Objects.equals(right, pair.right);
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}
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@Override
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public int hashCode() {
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int result = left != null ? left.hashCode() : 0;
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result = 31 * result + (right != null ? right.hashCode() : 0);
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return result;
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}
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}
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