@woosh/meep-engine/src/core/cache/CacheElement.js

Pure JavaScript game engine. Fully featured and production ready.

/**
 * Doubly linked list implementation for key-value pairs
 * @template Key
 * @template Value
 * @class
 */
export class CacheElement {

    /**
     *
     * @type {Key}
     */
    key = null;

    /**
     *
     * @type {Value}
     */
    value = null;

    /**
     *
     * @type {number}
     */
    weight = 0;

    /**
     * Link to next element (implements linked list)
     * @type {CacheElement<Key,Value>|null}
     */
    next = null;

    /**
     * Link to previous element (implements linked list)
     * @type {CacheElement<Key,Value>|null}
     */
    previous = null;

    unlink() {
        const next = this.next;
        const previous = this.previous;

        // re-wire links around self
        if (previous !== null) {
            previous.next = next;
        }
        if (next !== null) {
            next.previous = previous;
        }
    }

    toString() {
        return `CacheElement{ hasNext:${this.next !== null}, hasPrevious:${this.previous !== null}, weight:${this.weight}, key:${this.key}, value:${this.value} }`;
    }
}