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123 lines
4.4 KiB
JavaScript
123 lines
4.4 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla XUL Toolkit Testing Code.
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*
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* The Initial Developer of the Original Code is
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* Paolo Amadini <http://www.amadzone.org/>.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* Allows registering a mock XPCOM component, that temporarily replaces the
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* original one when an object implementing a given ContractID is requested
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* using createInstance.
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*
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* @param aContractID
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* The ContractID of the component to replace, for example
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* "@mozilla.org/filepicker;1".
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*
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* @param aReplacementCtor
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* The constructor function for the JavaScript object that will be
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* created every time createInstance is called. This object must
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* implement QueryInterface and provide the XPCOM interfaces required by
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* the specified ContractID (for example
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* Components.interfaces.nsIFilePicker).
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*/
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function MockObjectRegisterer(aContractID, aReplacementCtor) {
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this._contractID = aContractID;
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this._replacementCtor = aReplacementCtor;
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}
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MockObjectRegisterer.prototype = {
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/**
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* Replaces the current factory with one that returns a new mock object.
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*
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* After register() has been called, it is mandatory to call unregister() to
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* restore the original component. Usually, you should use a try-catch block
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* to ensure that unregister() is called.
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*/
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register: function MOR_register() {
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if (this._originalFactory)
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throw new Exception("Invalid object state when calling register()");
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// Define a factory that creates a new object using the given constructor.
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var providedConstructor = this._replacementCtor;
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this._mockFactory = {
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createInstance: function MF_createInstance(aOuter, aIid) {
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if (aOuter != null)
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throw Components.results.NS_ERROR_NO_AGGREGATION;
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return new providedConstructor().QueryInterface(aIid);
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}
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};
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var retVal = SpecialPowers.swapFactoryRegistration(this._cid, this._contractID, this._mockFactory, this._originalFactory);
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if ('error' in retVal) {
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throw new Exception("ERROR: " + retVal.error);
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} else {
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this._cid = retVal.cid;
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this._originalFactory = retVal.originalFactory;
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}
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},
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/**
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* Restores the original factory.
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*/
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unregister: function MOR_unregister() {
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if (!this._originalFactory)
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throw new Exception("Invalid object state when calling unregister()");
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// Free references to the mock factory.
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SpecialPowers.swapFactoryRegistration(this._cid, this._contractID, this._mockFactory, this._originalFactory);
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// Allow registering a mock factory again later.
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this._cid = null;
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this._originalFactory = null;
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this._mockFactory = null;
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},
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// --- Private methods and properties ---
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/**
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* The factory of the component being replaced.
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*/
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_originalFactory: null,
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/**
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* The CID under which the mock contractID was registered.
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*/
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_cid: null,
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/**
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* The nsIFactory that was automatically generated by this object.
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*/
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_mockFactory: null
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}
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