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/*
* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.graalvm.collections;
import java.util.Objects;
/**
* Utility class representing a pair of values.
*
* @since 19.0
*/
public final class Pair {
private static final Pair EMPTY = new Pair<>(null, null);
private final L left;
private final R right;
/**
* Returns an empty pair.
*
* @since 19.0
*/
@SuppressWarnings("unchecked")
public static Pair empty() {
return (Pair) EMPTY;
}
/**
* Constructs a pair with its left value being {@code left}, or returns an empty pair if
* {@code left} is null.
*
* @return the constructed pair or an empty pair if {@code left} is null.
* @since 19.0
*/
public static Pair createLeft(L left) {
if (left == null) {
return empty();
} else {
return new Pair<>(left, null);
}
}
/**
* Constructs a pair with its right value being {@code right}, or returns an empty pair if
* {@code right} is null.
*
* @return the constructed pair or an empty pair if {@code right} is null.
* @since 19.0
*/
public static Pair createRight(R right) {
if (right == null) {
return empty();
} else {
return new Pair<>(null, right);
}
}
/**
* Constructs a pair with its left value being {@code left}, and its right value being
* {@code right}, or returns an empty pair if both inputs are null.
*
* @return the constructed pair or an empty pair if both inputs are null.
* @since 19.0
*/
public static Pair create(L left, R right) {
if (right == null && left == null) {
return empty();
} else {
return new Pair<>(left, right);
}
}
private Pair(L left, R right) {
this.left = left;
this.right = right;
}
/**
* Returns the left value of this pair.
*
* @since 19.0
*/
public L getLeft() {
return left;
}
/**
* Returns the right value of this pair.
*
* @since 19.0
*/
public R getRight() {
return right;
}
/**
* {@inheritDoc}
*
* @since 19.0
*/
@Override
public int hashCode() {
return Objects.hashCode(left) + 31 * Objects.hashCode(right);
}
/**
* {@inheritDoc}
*
* @since 19.0
*/
@SuppressWarnings("unchecked")
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof Pair) {
Pair pair = (Pair) obj;
return Objects.equals(left, pair.left) && Objects.equals(right, pair.right);
}
return false;
}
/**
* {@inheritDoc}
*
* @since 19.0
*/
@Override
public String toString() {
// String.format isn't used here since it tends to pull a lot of types into image.
return "(" + left + ", " + right + ")";
}
}
