Angular Observer Factory

ngObserver.js

var ngObserver = angular.module('ngObserver', []);
ngObserver.filter('hashCode', function() {
    return function(input, hasType) {
        if(hasType == null) {
            hasType = false;
        }
        var result = typeof input;
        var raw_hash = 0;
        var mod_input = input;
        if(typeof input === 'function') {
            mod_input = input.toString();
        }
        if(typeof mod_input === 'string') {
            var hash = 0, i, chr, len;
            for (i = 0, len = mod_input.length; i < len; i++) {
                chr   = mod_input.charCodeAt(i);
                hash  = ((hash << 5) - hash) + chr;
                hash |= 0;
            }
            result += '(' + hash + ')';
            raw_hash = hash;
        }

        if(hasType) {
            return result;
        }
        return raw_hash;
    }
});
ngObserver.factory('Observer', ['hashCodeFilter', function(hashCodeFilter) {
	return function() {
		return angular.copy({
				observers: {},
				register: function (callback) {
					this.observers[hashCodeFilter(callback)] = callback;
				},
				deregister: function (callback) {
					delete this.observers[hashCodeFilter(callback)];
				},
				fire: function (sender, args) {
					angular.forEach(this.observers, function (callback) {
						callback(sender, args);
					});
				}
			});
		};
	}
]);