bitmark-grammar
Version:
66 lines (65 loc) • 2.46 kB
JavaScript
/*!
* Copyright 2016 The ANTLR Project. All rights reserved.
* Licensed under the BSD-3-Clause license. See LICENSE file in the project root for license information.
*/
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
import { Override } from "../Decorators";
import { MurmurHash } from "./MurmurHash";
import { ObjectEqualityComparator } from "./ObjectEqualityComparator";
/**
* This default implementation of {@link EqualityComparator} uses object equality
* for comparisons by calling {@link Object#hashCode} and {@link Object#equals}.
*
* @author Sam Harwell
*/
export class DefaultEqualityComparator {
/**
* {@inheritDoc}
*
* This implementation returns
* `obj.`{@link Object#hashCode hashCode()}.
*/
hashCode(obj) {
if (obj == null) {
return 0;
}
else if (typeof obj === "string" || typeof obj === "number") {
return MurmurHash.hashCode([obj]);
}
else {
return ObjectEqualityComparator.INSTANCE.hashCode(obj);
}
}
/**
* {@inheritDoc}
*
* This implementation relies on object equality. If both objects are
* `undefined` or `null`, this method returns `true`. Otherwise if only
* `a` is `undefined` or `null`, this method returns `false`. Otherwise,
* this method returns the result of
* `a.`{@link Object#equals equals}`(b)`.
*/
equals(a, b) {
if (a == null) {
return b == null;
}
else if (typeof a === "string" || typeof a === "number") {
return a === b;
}
else {
return ObjectEqualityComparator.INSTANCE.equals(a, b);
}
}
}
DefaultEqualityComparator.INSTANCE = new DefaultEqualityComparator();
__decorate([
Override
], DefaultEqualityComparator.prototype, "hashCode", null);
__decorate([
Override
], DefaultEqualityComparator.prototype, "equals", null);