123 lines
2.7 KiB
JavaScript
123 lines
2.7 KiB
JavaScript
/*
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* memory.js: Simple memory storage engine for nconf configuration(s)
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*
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* (C) 2011, Charlie Robbins
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*
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*/
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var nconf = require('../../nconf');
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//
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// ### function Memory (options)
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// #### @options {Object} Options for this instance
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// Constructor function for the Memory nconf store which maintains
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// a nested json structure based on key delimiters `:`.
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//
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// e.g. `my:nested:key` ==> `{ my: { nested: { key: } } }`
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//
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var Memory = exports.Memory = function (options) {
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options = options || {};
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this.type = 'memory';
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this.store = {};
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this.mtimes = {};
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};
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//
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// ### function get (key)
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// #### @key {string} Key to retrieve for this instance.
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// Retrieves the value for the specified key (if any).
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//
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Memory.prototype.get = function (key) {
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var target = this.store,
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path = nconf.path(key);
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//
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// Scope into the object to get the appropriate nested context
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//
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while (path.length > 0) {
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key = path.shift();
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if (!target[key]) {
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return;
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}
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target = target[key];
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if (path.length === 0) {
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return target;
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}
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}
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};
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//
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// ### function set (key, value)
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// #### @key {string} Key to set in this instance
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// #### @value {literal|Object} Value for the specified key
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// Sets the `value` for the specified `key` in this instance.
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//
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Memory.prototype.set = function (key, value) {
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var target = this.store,
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path = nconf.path(key);
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//
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// Update the `mtime` (modified time) of the key
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//
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this.mtimes[key] = Date.now();
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//
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// Scope into the object to get the appropriate nested context
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//
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while (path.length > 1) {
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key = path.shift();
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if (!target[key]) {
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target[key] = {};
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}
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target = target[key];
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}
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// Set the specified value in the nested JSON structure
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key = path.shift();
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target[key] = value;
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return true;
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};
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//
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// ### function clear (key)
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// #### @key {string} Key to remove from this instance
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// Removes the value for the specified `key` from this instance.
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//
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Memory.prototype.clear = function (key) {
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var target = this.store,
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path = nconf.path(key);
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//
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// Remove the key from the set of `mtimes` (modified times)
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//
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delete this.mtimes[key];
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//
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// Scope into the object to get the appropriate nested context
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//
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while (path.length > 1) {
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key = path.shift();
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if (!target[key]) {
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return;
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}
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target = target[key];
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}
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// Delete the key from the nested JSON structure
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key = path.shift();
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delete target[key];
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return true;
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};
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//
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// ### function reset (callback)
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// Clears all keys associated with this instance.
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//
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Memory.prototype.reset = function () {
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this.mtimes = {};
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this.store = {};
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return true;
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} |