/
MethodEmbed.ts
59 lines (48 loc) · 1.56 KB
/
MethodEmbed.ts
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/*
* Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with
* the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file 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.
*/
const lists: MethodEmbed[] = [];
export default class MethodEmbed {
public context;
public methodName;
private _originalMethod;
private _bindedMethod;
static add(context, methodName, methodOverride) {
getInstance(context, methodName).set(methodOverride);
}
static remove(context, methodName) {
getInstance(context, methodName).remove();
}
constructor(context, methodName) {
this.context = context;
this.methodName = methodName;
this._originalMethod = context[methodName].bind(context);
}
public set(methodOverride) {
this.context[this.methodName] = (...args) => {
return methodOverride(this._originalMethod(...args));
};
}
public remove() {
this.context[this.methodName] = this._originalMethod;
}
}
function getInstance(context, methodName): MethodEmbed {
let instance = lists.filter(
h => h.context === context && h.methodName === methodName
)[0];
if (!instance) {
instance = new MethodEmbed(context, methodName);
lists.push(instance);
}
return instance;
}