text: /**
      Licensed to OffGrid Networks (OGN) under one
      or more contributor license agreements.  See the NOTICE file
      distributed with this work for additional information
      regarding copyright ownership.  OGN 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://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.
  */
  
  var Q = require('q');
  
  // Given a function and an array of values, creates a chain of promises that
  // will sequentially execute func(args[i]).
  // Returns a promise.
  //
  function Q_chainmap(args, func) {
      return Q.when().then(function(inValue) {
          return args.reduce(function(soFar, arg) {
              return soFar.then(function(val) {
                  return func(arg, val);
              });
          }, Q(inValue));
      });
  }
  
  // Behaves similar to Q_chainmap but gracefully handles failures.
  // When a promise in the chain is rejected, it will call the failureCallback and then continue the processing, instead of stopping
  function Q_chainmap_graceful(args, func, failureCallback) {
      return Q.when().then(function(inValue) {
          return args.reduce(function(soFar, arg) {
              return soFar.then(function(val) {
                  return func(arg, val);
              }).fail(function(err) {
                  if (failureCallback) {
                      failureCallback(err);
                  }
              });
          }, Q(inValue));
      });
  }
  
  exports.Q_chainmap = Q_chainmap;
  exports.Q_chainmap_graceful = Q_chainmap_graceful;