61 lines
1.8 KiB
TypeScript
61 lines
1.8 KiB
TypeScript
module es {
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export class EqualityComparer<T> implements IEqualityComparer<T> {
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public static default<T>() {
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return new EqualityComparer<T>();
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}
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protected constructor() { }
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public equals(x: T, y: T): boolean {
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if (typeof x["equals"] == 'function') {
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return x["equals"](y);
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} else {
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return x === y;
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}
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}
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public getHashCode(o: T): number {
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if (typeof o == 'number') {
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return this._getHashCodeForNumber(o);
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}
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if (typeof o == 'string') {
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return this._getHashCodeForString(o);
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}
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let hashCode = 385229220;
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this.forOwn(o, (value) => {
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if (typeof value == 'number') {
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hashCode += this._getHashCodeForNumber(value);
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} else if (typeof value == 'string') {
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hashCode += this._getHashCodeForString(value);
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} else if (typeof value == 'object') {
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this.forOwn(value, () => {
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hashCode += this.getHashCode(value);
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});
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}
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});
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return hashCode;
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}
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private _getHashCodeForNumber(n: number): number {
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return n;
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}
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private _getHashCodeForString(s: string): number {
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let hashCode = 385229220;
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for (let i = 0; i < s.length; i++) {
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hashCode = (hashCode * -1521134295) ^ s.charCodeAt(i);
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}
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return hashCode;
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}
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private forOwn(object, iteratee){
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object = Object(object);
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Object.keys(object).forEach((key) => iteratee(object[key], key, object));
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}
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}
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} |