| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package javaemul.internal; |
| |
| import jsinterop.annotations.JsType; |
| |
| /** Contains logics for calculating hash codes in JavaScript. */ |
| @JsType |
| public class HashCodes { |
| |
| public static int getIdentityHashCode(Object o) { |
| switch (JsUtils.typeOf(o)) { |
| case "string": |
| return JsUtils.<String>uncheckedCast(o).hashCode(); |
| case "number": |
| return JsUtils.<Double>uncheckedCast(o).hashCode(); |
| case "boolean": |
| return JsUtils.<Boolean>uncheckedCast(o).hashCode(); |
| default: |
| return o == null ? 0 : getObjectIdentityHashCode(o); |
| } |
| } |
| |
| private static int nextHash; |
| |
| public static native int getObjectIdentityHashCode(Object o) /*-{ |
| return o.$H || (o.$H = @HashCodes::getNextHash()()); |
| }-*/; |
| |
| public static int getNextHash() { |
| return ++nextHash; |
| } |
| } |