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/*
* Copyright (c) 2017, 2019, 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
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* 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
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package org.graalvm.collections;
/**
* Strategy for comparing two objects. Default predefined strategies are {@link #DEFAULT},
* {@link #IDENTITY}, and {@link #IDENTITY_WITH_SYSTEM_HASHCODE}.
*
* @since 19.0
*/
public abstract class Equivalence {
/**
* Default equivalence calling {@link #equals(Object)} to check equality and {@link #hashCode()}
* for obtaining hash values. Do not change the logic of this class as it may be inlined in
* other places.
*
* @since 19.0
*/
public static final Equivalence DEFAULT = new Equivalence() {
@Override
public boolean equals(Object a, Object b) {
return a.equals(b);
}
@Override
public int hashCode(Object o) {
return o.hashCode();
}
};
/**
* Identity equivalence using {@code ==} to check equality and {@link #hashCode()} for obtaining
* hash values. Do not change the logic of this class as it may be inlined in other places.
*
* @since 19.0
*/
public static final Equivalence IDENTITY = new Equivalence() {
@Override
public boolean equals(Object a, Object b) {
return a == b;
}
@Override
public int hashCode(Object o) {
return o.hashCode();
}
};
/**
* Identity equivalence using {@code ==} to check equality and
* {@link System#identityHashCode(Object)} for obtaining hash values. Do not change the logic of
* this class as it may be inlined in other places.
*
* @since 19.0
*/
public static final Equivalence IDENTITY_WITH_SYSTEM_HASHCODE = new Equivalence() {
@Override
public boolean equals(Object a, Object b) {
return a == b;
}
@Override
public int hashCode(Object o) {
return System.identityHashCode(o);
}
};
/**
* Subclass for creating custom equivalence definitions.
*
* @since 19.0
*/
protected Equivalence() {
}
/**
* Returns {@code true} if the non-{@code null} arguments are equal to each other and
* {@code false} otherwise.
*
* @since 19.0
*/
public abstract boolean equals(Object a, Object b);
/**
* Returns the hash code of a non-{@code null} argument {@code o}.
*
* @since 19.0
*/
public abstract int hashCode(Object o);
}
