sbDndSourceTracker.js

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const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;

const CONTRACTID = "@songbirdnest.com/Songbird/DndSourceTracker;1";
const CLASSNAME = "Songbird Drag and Drop Source Tracker Service";
const CID = Components.ID("{54b21a93-5b1b-46a2-a60f-5378ccf7f65c}");
const IID = Ci.sbIDndSourceTracker;

function DndSourceTracker() {
  this._sources = {};
}
DndSourceTracker.prototype = {
  _sources: null,
  _nextHandle: 0,

  reset: function reset() {
    this._sources = {};
  },

  registerSource: function registerSource(aSource) {
    var handle = this._nextHandle.toString();
    this._nextHandle++;
    this._sources[handle] = aSource;
    return handle;
  },

  getSource: function getSource(aHandle) {
    if (aHandle in this._sources) {
      return this._sources[aHandle];
    }
    throw Cr.NS_ERROR_NOT_AVAILABLE;
  },

  getSourceSupports: function getSourceSupports(aHandle) {
    return this.getSource(aHandle.data);
  },

  QueryInterface: function(iid) {
    if (!iid.equals(IID) &&
        !iid.equals(Ci.nsISupports))
      throw Cr.NS_ERROR_NO_INTERFACE;
    return this;
  }
};

var gModule = {
  registerSelf: function(componentManager, fileSpec, location, type) {
    componentManager = componentManager.QueryInterface(Ci.nsIComponentRegistrar);
    componentManager.registerFactoryLocation(CID, CLASSNAME, CONTRACTID,
                                             fileSpec, location, type);
  },

  getClassObject: function(componentManager, cid, iid) {
    if (!iid.equals(Ci.nsIFactory))
      throw Cr.NS_ERROR_NOT_IMPLEMENTED;

    if (cid.equals(CID)) {
       return {
          createInstance: function(outer, iid) {
            if (outer != null)
              throw Cr.NS_ERROR_NO_AGGREGATION;
            return (new DndSourceTracker()).QueryInterface(iid);;
          }
       };
    }

    throw Cr.NS_ERROR_NO_INTERFACE;
  },

  canUnload: function(componentManager) { 
    return true; 
  }
};

function NSGetModule(comMgr, fileSpec) {
  return gModule;
}