package.lib.core.LRU.js Maven / Gradle / Ivy

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var Entry = (function () {
    function Entry(val) {
        this.value = val;
    }
    return Entry;
}());
export { Entry };
var LinkedList = (function () {
    function LinkedList() {
        this._len = 0;
    }
    LinkedList.prototype.insert = function (val) {
        var entry = new Entry(val);
        this.insertEntry(entry);
        return entry;
    };
    LinkedList.prototype.insertEntry = function (entry) {
        if (!this.head) {
            this.head = this.tail = entry;
        }
        else {
            this.tail.next = entry;
            entry.prev = this.tail;
            entry.next = null;
            this.tail = entry;
        }
        this._len++;
    };
    LinkedList.prototype.remove = function (entry) {
        var prev = entry.prev;
        var next = entry.next;
        if (prev) {
            prev.next = next;
        }
        else {
            this.head = next;
        }
        if (next) {
            next.prev = prev;
        }
        else {
            this.tail = prev;
        }
        entry.next = entry.prev = null;
        this._len--;
    };
    LinkedList.prototype.len = function () {
        return this._len;
    };
    LinkedList.prototype.clear = function () {
        this.head = this.tail = null;
        this._len = 0;
    };
    return LinkedList;
}());
export { LinkedList };
var LRU = (function () {
    function LRU(maxSize) {
        this._list = new LinkedList();
        this._maxSize = 10;
        this._map = {};
        this._maxSize = maxSize;
    }
    LRU.prototype.put = function (key, value) {
        var list = this._list;
        var map = this._map;
        var removed = null;
        if (map[key] == null) {
            var len = list.len();
            var entry = this._lastRemovedEntry;
            if (len >= this._maxSize && len > 0) {
                var leastUsedEntry = list.head;
                list.remove(leastUsedEntry);
                delete map[leastUsedEntry.key];
                removed = leastUsedEntry.value;
                this._lastRemovedEntry = leastUsedEntry;
            }
            if (entry) {
                entry.value = value;
            }
            else {
                entry = new Entry(value);
            }
            entry.key = key;
            list.insertEntry(entry);
            map[key] = entry;
        }
        return removed;
    };
    LRU.prototype.get = function (key) {
        var entry = this._map[key];
        var list = this._list;
        if (entry != null) {
            if (entry !== list.tail) {
                list.remove(entry);
                list.insertEntry(entry);
            }
            return entry.value;
        }
    };
    LRU.prototype.clear = function () {
        this._list.clear();
        this._map = {};
    };
    LRU.prototype.len = function () {
        return this._list.len();
    };
    return LRU;
}());
export default LRU;