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-rw-r--r--ext/mixed/js/cache-map.js77
1 files changed, 58 insertions, 19 deletions
diff --git a/ext/mixed/js/cache-map.js b/ext/mixed/js/cache-map.js
index 7953e2cc..bcfb2ff4 100644
--- a/ext/mixed/js/cache-map.js
+++ b/ext/mixed/js/cache-map.js
@@ -24,7 +24,7 @@ class CacheMap {
* Creates a new CacheMap.
* @param maxCount The maximum number of entries able to be stored in the cache.
* @param create A function to create a value for the corresponding path.
- * The signature is: create(...path)
+ * The signature is: create(path)
*/
constructor(maxCount, create) {
if (!(
@@ -60,11 +60,56 @@ class CacheMap {
}
/**
+ * Returns whether or not an item exists at the given path.
+ * @param path Array corresponding to the key of the cache.
+ * @returns A boolean indicating whether ot not the item exists.
+ */
+ has(path) {
+ const node = this._accessNode(false, false, null, false, path);
+ return (node !== null);
+ }
+
+ /**
+ * Gets an item at the given path, if it exists. Otherwise, returns undefined.
+ * @param path Array corresponding to the key of the cache.
+ * @returns The existing value at the path, if any; otherwise, undefined.
+ */
+ get(path) {
+ const node = this._accessNode(false, false, null, true, path);
+ return (node !== null ? node.value : void 0);
+ }
+
+ /**
* Gets an item at the given path, if it exists. Otherwise, creates a new item
* and adds it to the cache. If the count exceeds the maximum count, items will be removed.
- * @param path Arguments corresponding to the key of the cache.
+ * @param path Array corresponding to the key of the cache.
+ * @returns The existing value at the path, if any; otherwise, a newly created value.
*/
- get(...path) {
+ getOrCreate(path) {
+ return this._accessNode(true, false, null, true, path).value;
+ }
+
+ /**
+ * Sets a value at a given path.
+ * @param path Array corresponding to the key of the cache.
+ * @param value The value to store in the cache.
+ */
+ set(path, value) {
+ this._accessNode(false, true, value, true, path);
+ }
+
+ /**
+ * Clears the cache.
+ */
+ clear() {
+ this._map.clear();
+ this._count = 0;
+ this._resetEndNodes();
+ }
+
+ // Private
+
+ _accessNode(create, set, value, updateRecency, path) {
let ii = path.length;
if (ii === 0) { throw new Error('Invalid path'); }
@@ -77,13 +122,18 @@ class CacheMap {
}
if (i === ii) {
- // Found (map is now a node)
- this._updateRecency(map);
- return map.value;
+ // Found (map should now be a node)
+ if (updateRecency) { this._updateRecency(map); }
+ if (set) { map.value = value; }
+ return map;
}
// Create new
- const value = this._create(...path);
+ if (create) {
+ value = this._create(path);
+ } else if (!set) {
+ return null;
+ }
// Create mapping
--ii;
@@ -101,20 +151,9 @@ class CacheMap {
this._updateCount();
- return value;
- }
-
- /**
- * Clears the cache.
- */
- clear() {
- this._map.clear();
- this._count = 0;
- this._resetEndNodes();
+ return node;
}
- // Private
-
_updateRecency(node) {
this._removeNode(node);
this._addNode(node, this._listFirst);