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/*
Shared Namespace Library for JavaScript Code Modules
Usage:
Components.utils.import('resource://my-modules/namespace.jsm');
var namespace = getNamespaceFor('mylibrary');
if (!namespace.func1) {
namespace.func1 = function() { ... };
namespace.func2 = function() { ... };
}
var EXPORTED_SYMBOLS = ['func1', 'func2'];
var func1 = namespace.func1;
var func2 = namespace.func2;
license: The MIT License, Copyright (c) 2010 SHIMODA "Piro" Hiroshi
http://www.cozmixng.org/repos/piro/fx3-compatibility-lib/trunk/license.txt
original:
http://www.cozmixng.org/repos/piro/fx3-compatibility-lib/trunk/namespace.js
*/
var EXPORTED_SYMBOLS = ['getNamespaceFor'];
const Cc = Components.classes;
const Ci = Components.interfaces;
const currentRevision = 2;
const QUERY = 'namespace.jsm[piro.sakura.ne.jp]:GetExistingNamespace';
const STORAGE_PROP = 'namespaces-storage';
const ObserverService = Cc['@mozilla.org/observer-service;1']
.getService(Ci.nsIObserverService);
var bag = Cc['@mozilla.org/hash-property-bag;1']
.createInstance(Ci.nsIPropertyBag);
ObserverService.notifyObservers(bag, QUERY, null);
var storage;
try {
storage = bag.getProperty(STORAGE_PROP);
}
catch(e) {
// This is the first provider of namespaces, so I create a new storage.
storage = {};
}
// Export the storage to other instances when they are loaded.
ObserverService.addObserver(
{
observe : function(aSubject, aTopic, aData)
{
if (aTopic != QUERY) return;
aSubject.QueryInterface(Ci.nsIWritablePropertyBag)
.setProperty(STORAGE_PROP, storage);
}
},
QUERY,
false
);
function getNamespaceFor(aName)
{
if (!aName)
throw new Error('you must specify the name of the namespace!');
if (!(aName in storage))
storage[aName] = {};
return storage[aName];
}
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