@sanjo/cache/Cache.js

Caches

import { last } from '@sanjo/array';
export const FAILED_TO_RETRIEVE_VALUE_ERROR_MESSAGE = 'Failed to retrieve value.';
export class Cache {
    _cache;
    constructor() {
        this._cache = new Map();
    }
    has(key) {
        return Boolean(this._retrieveValue(key, () => false));
    }
    retrieve(key) {
        return this._retrieveValue(key, () => {
            throw new Error(FAILED_TO_RETRIEVE_VALUE_ERROR_MESSAGE);
        });
    }
    set(key, value) {
        key = this._convertKeyToArray(key);
        let object = this._cache;
        for (const keyPart of key.slice(0, key.length - 1)) {
            if (object instanceof Map && object.has(keyPart)) {
                object = object.get(keyPart);
            }
            else {
                const newObject = new Map();
                object.set(keyPart, newObject);
                object = newObject;
            }
        }
        object.set(last(key), value);
    }
    clear() {
        this._cache = new Map();
    }
    _convertKeyToArray(key) {
        let result;
        if (Array.isArray(key)) {
            result = key;
        }
        else {
            result = [key];
        }
        return result;
    }
    _retrieveValue(key, onMiss) {
        key = this._convertKeyToArray(key);
        let object = this._cache;
        for (const keyPart of key) {
            if (object instanceof Map && object.has(keyPart)) {
                object = object.get(keyPart);
            }
            else {
                return onMiss();
            }
        }
        return object;
    }
}
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