Virtualize data objects

chrome/content/zotero/xpcom/data/collection.js

@@ -24,12 +24,7 @@
 */
 
 Zotero.Collection = function() {
-	let dataTypes = [
-		'primaryData',
-		'childCollections',
-		'childItems'
-	];
-	Zotero.DataObject.apply(this, ['collection', dataTypes]);
+	Zotero.Collection._super.apply(this);
 	
 	this._name = null;
 	this._parentID = null;
@@ -42,9 +37,17 @@ Zotero.Collection = function() {
 	this._childItems = [];
 }
 
-Zotero.Collection.prototype = Object.create(Zotero.DataObject.prototype);
+Zotero.Collection._super = Zotero.DataObject;
+Zotero.Collection.prototype = Object.create(Zotero.Collection._super.prototype);
 Zotero.Collection.constructor = Zotero.Collection;
 
+Zotero.Collection.prototype._objectType = 'collection';
+Zotero.Collection.prototype._dataTypes = Zotero.Collection._super.prototype._dataTypes.concat([
+	'primaryData',
+	'childCollections',
+	'childItems'
+]);
+
 Zotero.Collection.prototype.__defineGetter__('id', function () { return this._get('id'); });
 Zotero.Collection.prototype.__defineSetter__('id', function (val) { this._set('id', val); });
 Zotero.Collection.prototype.__defineGetter__('libraryID', function () { return this._get('libraryID'); });

chrome/content/zotero/xpcom/data/dataObject.js

@@ -24,21 +24,16 @@
 */
 
 /**
- *
- * @param {String} objectType
- * @param {String[]} dataTypes A set of data types that can be loaded for this data object
- *
  * @property {String} (readOnly) objectType
  * @property {String} (readOnly) libraryKey
  * @property {String|null} parentKey Null if no parent
  * @property {Integer|false|undefined} parentID False if no parent. Undefined if not applicable (e.g. search objects)
  */
 
-Zotero.DataObject = function (objectType, dataTypes) {
-	this._objectType = objectType;
+Zotero.DataObject = function () {
+	let objectType = this._objectType;
 	this._ObjectType = objectType[0].toUpperCase() + objectType.substr(1);
 	this._objectTypePlural = Zotero.DataObjectUtilities.getObjectTypePlural(objectType);
-	this._dataTypes = dataTypes;
 	
 	this._id = null;
 	this._libraryID = null;
@@ -57,6 +52,9 @@ Zotero.DataObject = function (objectType, dataTypes) {
 	this._clearChanged();
 };
 
+Zotero.DataObject.prototype._objectType = 'dataObject';
+Zotero.DataObject.prototype._dataTypes = [];
+
 Zotero.Utilities.Internal.defineProperty(Zotero.DataObject, 'objectType', {
 	get: function() this._objectType
 });
@@ -74,10 +72,6 @@ Zotero.Utilities.Internal.defineProperty(Zotero.DataObject, 'parentID', {
 
 
 Zotero.DataObject.prototype._get = function (field) {
-	if (this._objectType == 'item') {
-		throw new Error("_get is not valid for items");
-	}
-	
 	if (this['_' + field] !== null) {
 		return this['_' + field];
 	}
@@ -166,11 +160,6 @@ Zotero.DataObject.prototype._setParentID = function (id) {
  * @return {Boolean} True if changed, false if stayed the same
  */
 Zotero.DataObject.prototype._setParentKey = function(key) {
-	if (this._objectType == 'item') {
-		if (!this.isNote() && !this.isAttachment()) {
-			throw new Error("_setParentKey() can only be called on items of type 'note' or 'attachment'");
-		}
-	}
 	key = Zotero.DataObjectUtilities.checkKey(key);
 	
 	if (this._parentKey == key) {

chrome/content/zotero/xpcom/data/item.js

@@ -32,18 +32,7 @@ Zotero.Item = function(itemTypeOrID) {
 		throw ("Zotero.Item constructor only takes one parameter");
 	}
 	
-	var dataTypes = [
-		'primaryData',
-		'itemData',
-		'note',
-		'creators',
-		'childItems',
-		'relatedItems', // TODO: remove
-		'tags',
-		'collections',
-		'relations'
-	];
-	Zotero.DataObject.apply(this, ['item', dataTypes]);
+	Zotero.Item._super.apply(this);
 	
 	this._disabled = false;
 	
@@ -100,10 +89,23 @@ Zotero.Item = function(itemTypeOrID) {
 	}
 }
 
-Zotero.Item.prototype = Object.create(Zotero.DataObject.prototype);
+Zotero.Item._super = Zotero.DataObject;
+Zotero.Item.prototype = Object.create(Zotero.Item._super.prototype);
 Zotero.Item.constructor = Zotero.Item;
 
-Zotero.Item.prototype.__defineGetter__('objectType', function () { return 'item'; });
+Zotero.Item.prototype._objectType = 'item';
+Zotero.Item.prototype._dataTypes = Zotero.Item._super.prototype._dataTypes.concat([
+	'primaryData',
+	'itemData',
+	'note',
+	'creators',
+	'childItems',
+	'relatedItems', // TODO: remove
+	'tags',
+	'collections',
+	'relations'
+]);
+
 Zotero.Item.prototype.__defineGetter__('id', function () this._id);
 Zotero.Item.prototype.__defineGetter__('itemID', function () {
 	Zotero.debug("Item.itemID is deprecated -- use Item.id");
@@ -149,6 +151,17 @@ Zotero.Item.prototype.isPrimaryField = function (fieldName) {
 	return Zotero.Items.isPrimaryField(fieldName);
 }
 
+Zotero.Item.prototype._get = function (fieldName) {
+	throw new Error("_get is not valid for items");
+}
+
+Zotero.Item.prototype._setParentKey = function() {
+	if (!this.isNote() && !this.isAttachment()) {
+		throw new Error("_setParentKey() can only be called on items of type 'note' or 'attachment'");
+	}
+	
+	Zotero.Item._super.prototype._setParentKey.apply(this, arguments);
+}
 
 //////////////////////////////////////////////////////////////////////////////
 //

chrome/content/zotero/xpcom/search.js

@@ -24,11 +24,7 @@
 */
 
 Zotero.Search = function() {
-	var dataTypes = [
-		'primaryData',
-		'conditions'
-	];
-	Zotero.DataObject.apply(this, ['search', dataTypes]);
+	Zotero.Search._super.apply(this);
 	
 	this._name = null;
 	
@@ -41,9 +37,16 @@ Zotero.Search = function() {
 	this._hasPrimaryConditions = false;
 }
 
-Zotero.Search.prototype = Object.create(Zotero.DataObject.prototype);
+Zotero.Search._super = Zotero.DataObject;
+Zotero.Search.prototype = Object.create(Zotero.Search._super.prototype);
 Zotero.Search.constructor = Zotero.Search;
 
+Zotero.Search.prototype._objectType = 'search';
+Zotero.Search.prototype._dataTypes = Zotero.Search._super.prototype._dataTypes.concat([
+	'primaryData',
+	'conditions'
+]);
+
 Zotero.Search.prototype.getID = function(){
 	Zotero.debug('Zotero.Search.getName() is deprecated -- use Search.id');
 	return this._id;