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Viewing file:     LRU.js (3.09 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var LinkedListNode = /** @class */ (function () {
    function LinkedListNode(key, value) {
        this.key = key;
        this.value = value;
    }
    return LinkedListNode;
}());
var LRUCache = /** @class */ (function () {
    function LRUCache(size) {
        this.nodeMap = {};
        this.size = 0;
        if (typeof size !== 'number' || size < 1) {
            throw new Error('Cache size can only be positive number');
        }
        this.sizeLimit = size;
    }
    Object.defineProperty(LRUCache.prototype, "length", {
        get: function () {
            return this.size;
        },
        enumerable: true,
        configurable: true
    });
    LRUCache.prototype.prependToList = function (node) {
        if (!this.headerNode) {
            this.tailNode = node;
        }
        else {
            this.headerNode.prev = node;
            node.next = this.headerNode;
        }
        this.headerNode = node;
        this.size++;
    };
    LRUCache.prototype.removeFromTail = function () {
        if (!this.tailNode) {
            return undefined;
        }
        var node = this.tailNode;
        var prevNode = node.prev;
        if (prevNode) {
            prevNode.next = undefined;
        }
        node.prev = undefined;
        this.tailNode = prevNode;
        this.size--;
        return node;
    };
    LRUCache.prototype.detachFromList = function (node) {
        if (this.headerNode === node) {
            this.headerNode = node.next;
        }
        if (this.tailNode === node) {
            this.tailNode = node.prev;
        }
        if (node.prev) {
            node.prev.next = node.next;
        }
        if (node.next) {
            node.next.prev = node.prev;
        }
        node.next = undefined;
        node.prev = undefined;
        this.size--;
    };
    LRUCache.prototype.get = function (key) {
        if (this.nodeMap[key]) {
            var node = this.nodeMap[key];
            this.detachFromList(node);
            this.prependToList(node);
            return node.value;
        }
    };
    LRUCache.prototype.remove = function (key) {
        if (this.nodeMap[key]) {
            var node = this.nodeMap[key];
            this.detachFromList(node);
            delete this.nodeMap[key];
        }
    };
    LRUCache.prototype.put = function (key, value) {
        if (this.nodeMap[key]) {
            this.remove(key);
        }
        else if (this.size === this.sizeLimit) {
            var tailNode = this.removeFromTail();
            var key_1 = tailNode.key;
            delete this.nodeMap[key_1];
        }
        var newNode = new LinkedListNode(key, value);
        this.nodeMap[key] = newNode;
        this.prependToList(newNode);
    };
    LRUCache.prototype.empty = function () {
        var keys = Object.keys(this.nodeMap);
        for (var i = 0; i < keys.length; i++) {
            var key = keys[i];
            var node = this.nodeMap[key];
            this.detachFromList(node);
            delete this.nodeMap[key];
        }
    };
    return LRUCache;
}());
exports.LRUCache = LRUCache;