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import { Injectable, isDevMode } from '@angular/core';
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@Injectable()
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export class CacheService {
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static KEY = 'CacheService';
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_cache = new Map();
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/**
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* check if there is a value in our store
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*/
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has(key: string | number): boolean {
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let _key = this.normalizeKey(key);
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return this._cache.has(_key);
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}
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/**
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* store our state
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*/
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set(key: string | number, value: any): void {
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let _key = this.normalizeKey(key);
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this._cache.set(_key, value);
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}
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/**
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* get our cached value
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*/
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get(key: string | number): any {
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let _key = this.normalizeKey(key);
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return this._cache.get(_key);
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}
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/**
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* release memory refs
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*/
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clear(): void {
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this._cache.clear();
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}
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/**
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* convert to json for the client
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*/
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dehydrate(): any {
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let json = {};
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this._cache.forEach((value: any, key: string) => json[key] = value);
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return json;
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}
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/**
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* convert server json into out initial state
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*/
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rehydrate(json: any): void {
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Object.keys(json).forEach((key: string) => {
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let _key = this.normalizeKey(key);
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let value = json[_key];
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this._cache.set(_key, value);
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});
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}
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/**
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* allow JSON.stringify to work
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*/
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toJSON(): any {
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return this.dehydrate();
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}
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/**
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* convert numbers into strings
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*/
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normalizeKey(key: string | number): string {
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if (isDevMode() && this._isInvalidValue(key)) {
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throw new Error('Please provide a valid key to save in the CacheService');
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}
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return key + '';
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}
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_isInvalidValue(key): boolean {
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return key === null ||
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key === undefined ||
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key === 0 ||
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key === '' ||
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typeof key === 'boolean' ||
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Number.isNaN(<number>key);
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}
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}
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