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2010-07-12
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/*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Alex Fritze <alex@croczilla.com> (original author)
* Nickolay Ponomarev <asqueella@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
var EXPORTED_SYMBOLS = [ "XPCOMUtilsEx" ];
const ARBITER_NAME = "arbiter"
const ARBITER_CONTRACT_ID = "@yandex.ru/" + ARBITER_NAME + ";1";
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
var XPCOMUtilsEx = {
/**
* Generate a QueryInterface implementation. The returned function must be
* assigned to the 'QueryInterface' property of a JS object. When invoked on
* that object, it checks if the given iid is listed in the |interfaces|
* param, and if it is, returns |this| (the object it was called on).
*/
generateQI: function(interfaces) {
return makeQI([i.name for each (i in interfaces) if (i)]);
},
/**
* Generate the NSGetModule function (along with the module definition).
* See the parameters to generateModule.
*/
generateNSGetModule: function(componentsArray, postRegister, preUnregister) {
return function NSGetModule(compMgr, fileSpec) {
return XPCOMUtilsEx.generateModule(componentsArray,
postRegister,
preUnregister);
}
},
/**
* Generate a module implementation.
*
* @param componentsArray Array of component constructors. See the comment
* at the top of this file for details.
* @param postRegister optional post-registration function with
* signature 'postRegister(nsIComponentManager,
* nsIFile, componentsArray)'
* @param preUnregister optional pre-unregistration function with
* signature 'preUnregister(nsIComponentManager,
* nsIFile, componentsArray)'
*/
generateModule: function(componentsArray, postRegister, preUnregister) {
let classes = [];
for each (let component in componentsArray) {
classes.push({
cid: component.prototype.classID,
className: component.prototype.classDescription,
contractID: component.prototype.contractID,
factory: this._getFactory(component),
categories: component.prototype._xpcom_categories,
version: component.prototype.version,
registred: false
});
}
return { // nsIModule impl.
getClassObject: function(compMgr, cid, iid) {
// We only support nsIFactory queries, not nsIClassInfo
if (!iid.equals(Ci.nsIFactory))
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
for each (let classDesc in classes) {
if (classDesc.cid.equals(cid))
return classDesc.factory;
}
throw Cr.NS_ERROR_FACTORY_NOT_REGISTERED;
},
registerSelf: function(compMgr, fileSpec, location, type) {
var componentCount = 0;
debug("*** registering " + fileSpec.leafName + ": [ ");
compMgr.QueryInterface(Ci.nsIComponentRegistrar);
var again = false;
var arbiter = null;
if ((ARBITER_CONTRACT_ID in Cc) && (compMgr.isContractIDRegistered(ARBITER_CONTRACT_ID)))
arbiter = Cc[ARBITER_CONTRACT_ID].getService(Ci.yIArbiter);
for each (let classDesc in classes) {
debug((componentCount++ ? ", " : "") + classDesc.className);
if (arbiter) {
if (classDesc.registred) {
if (arbiter.accept(classDesc.contractID, classDesc.version)) {
compMgr.registerFactoryLocation(classDesc.cid,
classDesc.className,
classDesc.contractID,
fileSpec,
location,
type);
// categories
if (classDesc.categories) {
let catMan = XPCOMUtilsEx.categoryManager;
for each (let cat in classDesc.categories) {
let defaultValue = (cat.service ? "service," : "") + classDesc.contractID;
catMan.addCategoryEntry(cat.category,
cat.entry || classDesc.className,
cat.value || defaultValue,
true, true);
}
}
}
continue;
}
else {
arbiter.register(classDesc.contractID, classDesc.version);
classDesc.registred = true;
}
}
again = true;
} /* for */
if (postRegister)
postRegister(compMgr, fileSpec, componentsArray);
debug(" ]\n");
if (again)
throw Cr.NS_ERROR_FACTORY_REGISTER_AGAIN;
},
unregisterSelf: function(compMgr, fileSpec, location) {
var componentCount = 0;
debug("*** unregistering " + fileSpec.leafName + ": [ ");
compMgr.QueryInterface(Ci.nsIComponentRegistrar);
if (preUnregister)
preUnregister(compMgr, fileSpec, componentsArray);
for each (let classDesc in classes) {
debug((componentCount++ ? ", " : "") + classDesc.className);
if (classDesc.categories) {
let catMan = XPCOMUtilsEx.categoryManager;
for each (let cat in classDesc.categories) {
catMan.deleteCategoryEntry(cat.category,
cat.entry || classDesc.className,
true);
}
}
compMgr.unregisterFactoryLocation(classDesc.cid, fileSpec);
}
debug(" ]\n");
},
canUnload: function(compMgr) {
return true;
}
};
},
/**
* Convenience access to category manager
*/
get categoryManager() {
return Components.classes["@mozilla.org/categorymanager;1"]
.getService(Ci.nsICategoryManager);
},
/**
* Returns an nsIFactory for |component|.
*/
_getFactory: function(component) {
var factory = component.prototype._xpcom_factory;
if (!factory) {
factory = {
createInstance: function(outer, iid) {
if (outer != null)
throw Components.results.NS_ERROR_NO_AGGREGATION;
if (!this._instance)
this._instance = new component();
return this._instance.QueryInterface(iid);
}
}
}
return factory;
}
};
/**
* Helper for XPCOMUtilsEx.generateQI to avoid leaks - see bug 381651#c1
*/
function makeQI(interfaceNames) {
return function XPCOMUtilsEx_QueryInterface(iid) {
if (iid.equals(Ci.nsISupports))
return this;
for each (let interfaceName in interfaceNames) {
if (Ci[interfaceName].equals(iid))
return this;
}
throw Cr.NS_ERROR_NO_INTERFACE;
};
}