зеркало из https://github.com/mozilla/gecko-dev.git
128 строки
3.5 KiB
JavaScript
128 строки
3.5 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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const Cm = Components.manager;
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import { Log } from "resource://gre/modules/Log.sys.mjs";
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var logger = Log.repository.getLogger("MockRegistrar");
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export var MockRegistrar = Object.freeze({
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_registeredComponents: new Map(),
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_originalCIDs: new Map(),
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get registrar() {
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return Cm.QueryInterface(Ci.nsIComponentRegistrar);
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},
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/**
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* Register a mock to override target interfaces.
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* The target interface may be accessed through _genuine property of the mock.
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* If you register multiple mocks to the same contract ID, you have to call
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* unregister in reverse order. Otherwise the previous factory will not be
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* restored.
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*
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* @param contractID The contract ID of the interface which is overridden by
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the mock.
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* e.g. "@mozilla.org/file/directory_service;1"
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* @param mock An object which implements interfaces for the contract ID.
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* @param args An array which is passed in the constructor of mock.
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*
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* @return The CID of the mock.
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*/
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register(contractID, mock, args) {
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let originalCID;
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let originalFactory;
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try {
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originalCID = this._originalCIDs.get(contractID);
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if (!originalCID) {
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originalCID = this.registrar.contractIDToCID(contractID);
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this._originalCIDs.set(contractID, originalCID);
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}
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originalFactory = Cm.getClassObject(originalCID, Ci.nsIFactory);
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} catch (e) {
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// There's no original factory. Ignore and just register the new
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// one.
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}
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let cid = Services.uuid.generateUUID();
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let factory = {
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createInstance(iid) {
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let wrappedMock;
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if (mock.prototype && mock.prototype.constructor) {
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wrappedMock = Object.create(mock.prototype);
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mock.apply(wrappedMock, args);
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} else if (typeof mock == "function") {
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wrappedMock = mock();
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} else {
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wrappedMock = mock;
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}
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if (originalFactory) {
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try {
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let genuine = originalFactory.createInstance(iid);
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wrappedMock._genuine = genuine;
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} catch (ex) {
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logger.info("Creating original instance failed", ex);
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}
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}
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return wrappedMock.QueryInterface(iid);
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},
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QueryInterface: ChromeUtils.generateQI(["nsIFactory"]),
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};
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this.registrar.registerFactory(
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cid,
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"A Mock for " + contractID,
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contractID,
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factory
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);
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this._registeredComponents.set(cid, {
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contractID,
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factory,
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originalCID,
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});
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return cid;
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},
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/**
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* Unregister the mock.
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*
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* @param cid The CID of the mock.
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*/
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unregister(cid) {
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let component = this._registeredComponents.get(cid);
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if (!component) {
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return;
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}
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this.registrar.unregisterFactory(cid, component.factory);
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if (component.originalCID) {
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// Passing `null` for the factory re-maps the contract ID to the
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// entry for its original CID.
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this.registrar.registerFactory(
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component.originalCID,
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"",
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component.contractID,
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null
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);
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}
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this._registeredComponents.delete(cid);
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},
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/**
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* Unregister all registered mocks.
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*/
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unregisterAll() {
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for (let cid of this._registeredComponents.keys()) {
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this.unregister(cid);
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}
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},
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});
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