code: function() {
          var i, n = this.numHierarchies,
              hierarchies = {}, member, members = [],
              tuple = {
                  index: this._tupleIndex,
                  hierarchies: hierarchies,
                  members: members
              }
          ;
          for (i=0; i < n; i++) {
            member = this._member(i);
            hierarchies[this._hierarchyOrder[i]] = member;
            members.push(member);
          }
          return tuple;
      }
docs: Get the current tuple as an object. The tuple object has the following structure: <ul>
  <li><code>index</code> <code>int</code>: the ordinal of this tuple within its axis</li>
  <li><code>hierarchies</code> <code>object</code>: A map of members using hierarchy names as keys, and member objects as values</li>
  <li><code>members</code> <code>array</code>: An array of members in order of hierarchy order.</li>
  </ul>
  @method getTuple
  @return {object} An object representing the current tuple..