/*
 * Licensed to Cloudkick, Inc ('Cloudkick') under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * Cloudkick licenses this file to You 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.
 */

function getSnapshot(scope) {
  var snapshot = {};

  for (var item in scope) {
    snapshot[item] = true;
  }

  return snapshot;
}

function getDifferences(scopeSnapshot1, scopeSnapshot2) {
  var diff = [];

  for (var item in scopeSnapshot2) {
    if (scopeSnapshot1[item] === undefined) {
      diff.push(item);
    }
  }

  return diff;
}

exports.getSnapshot = getSnapshot;
exports.getDifferences = getDifferences;
