/*
* Copyright 2015-2017 WorldWind Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
define([
'../../../util/WWUtil'
], function (WWUtil) {
"use strict";
/**
* Cache working on a basic principle of storing the data as a pair of key, value. Currently the values are
* never invalidated.
* @alias TreeKeyValueCache
* @constructor
* @classdesc Represents internally used cache which stores data in a tree like structure.
*/
var TreeKeyValueCache = function() {
this.map = {};
};
/**
* Adds new element to the cache. It accepts level, key and value in order
* @param level {Object} Anything that can be used as a key in JavaScript object
* @param key {Object} Anything that can be used as a key in JavaScript object
* @param value {Object} The value to be stored in the cache on given level and value. Value must started with #
*/
TreeKeyValueCache.prototype.add = function(level, key, value){
if(!this.map[level]) {
this.map[level] = {};
}
this.map[level][key] = value;
};
/**
* It returns value for key stored at certain level. If there is no such level, it returns null. If there is such leave then the key starting with # gets treated a bit differently.
* @param level {Object} Anything that can be used as a key in JavaScript object
* @param key {Object} Anything that can be used as a key in JavaScript object
* @returns {Object|null}
*/
TreeKeyValueCache.prototype.value = function(level, key) {
if(!this.map[level]){
return null;
}
if(key.indexOf("#") == -1) {
var currentLevel = this.level(level);
for(var keyFromLevel in currentLevel) {
if(!currentLevel.hasOwnProperty(keyFromLevel)){
continue;
}
if(WWUtil.startsWith(keyFromLevel, key)){
return currentLevel[keyFromLevel];
}
}
}
return this.map[level][key] || null;
};
/**
* It returns the whole level of the data. If there is none then undefined is returned.
* @param level {Object} Anything that can be used as a key in JavaScript object
* @returns {Object|null}
*/
TreeKeyValueCache.prototype.level = function(level) {
return this.map[level];
};
/**
* It removes the data from the map if such data exists.
* @param level {Object} Anything that can be used as a key in JavaScript object
* @param key {Object} Anything that can be used as a key in JavaScript object
*/
TreeKeyValueCache.prototype.remove = function(level, key) {
delete this.map[level][key];
};
var applicationLevelCache = new TreeKeyValueCache();
TreeKeyValueCache.applicationLevelCache = function() {
return applicationLevelCache;
};
return TreeKeyValueCache;
});