/* exported SettingsURL */
'use strict';

// This library helps with managing settings that can either send back
// string uris or blobs that need to be turned into blob: uris.
// Usage is as follows:
//  var blobURL = new SettingsURL();
//  element.src = blobURL.set(settingValue);

function SettingsURL() {
  this._url = null;
  this._isBlob = false;
}

SettingsURL.prototype = {
  set: function(value) {
    if (this._isBlob) {
      window.URL.revokeObjectURL(this._url);
    }
    if (value instanceof Blob) {
      this._isBlob = true;
      this._url = window.URL.createObjectURL(value);
    } else {
      this._isBlob = false;
      this._url = value;
    }
    return this._url;
  },

  get: function() {
    return this._url;
  }
};