FXResourceMgr.js

function FXResourceMgr() {
  this.cache = [];
}

FXResourceMgr.prototype.getResource = function(type, properties) {
  properties = properties || {};
  for (var i = 0; i < this.cache.length; i++) {
    var res = this.cache[i];
    if (res.type == type && !res.used) {
      var areTheSame = true;
      for (var propName in properties) {
        if (properties[propName] != res.properties[propName]) {
          areTheSame = false;
        }
      }
      if (areTheSame)
        return res;
    }
  }
  return null;
};

FXResourceMgr.prototype.addResource = function(type, obj, properties) {
  var res = {
    type: type,
    obj: obj,
    properties: properties
  };
  this.cache.push(res);
  return res;
};

FXResourceMgr.prototype.markAllAsNotUsed = function() {
  for (var i = 0; i < this.cache.length; i++) {
    this.cache[i].used = false;
  }
};

module.exports = FXResourceMgr;