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/* Authors:
* Petr Vobornik <pvoborni@redhat.com>
*
* Copyright (C) 2012 Red Hat
* see file 'COPYING' for use and warranty information
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
define(['dojo/_base/declare',
'dojo/_base/array',
'dojo/_base/lang',
'./construct',
'./Builder',
'./Construct_registry'
], function(declare, array, lang, construct, Builder, Construct_registry) {
var Singleton_registry = declare(null, {
/**
* Registry for storing singleton instances of various items based
* on their type.
*
* @class
* @name Singleton_registry
*/
/**
* Internal map for instances
* @protected
* @type Object
*/
_map: {},
/**
* Builder used for building new instances. Builder has to have a
* Constructor registry set.
* @type Builder
*/
builder: null,
/**
* Gets an instance of given type. Creates a new one if it doesn't
* exist.
*
* When an object is passed in, the function returns it.
*
* @param type {String|Object} Type's name. Or the the object itself.
* @returns Object|null
*/
get: function(type) {
if (typeof type === 'object') return type;
var obj = this._map[type];
if (!obj) {
if (!this.builder) {
throw {
error: 'Object not initialized: missing builder',
ref: this
};
}
obj = this._map[type] = this.builder.build(type);
}
return obj;
},
/**
* Removes object of given type from registry
*
* @param {String} type
*/
remove: function(type) {
var undefined;
this._map[type] = undefined;
},
/**
* Registers construction specification
*
* @param type {String|Object} type or construction spec
* @param func {Function} ctor or factory function
* @param [default_spec] {Object} default spec object for given type
*
* @returns Object
*/
register: function(type, func, default_spec) {
if (!lang.exists('builder.registry', this)) {
throw {
error: 'Object Initialized Exception: builder not initalized',
context: this
};
}
this.builder.registry.register(type, func, default_spec);
},
constructor: function(spec) {
spec = spec || {};
this.builder = spec.builder || new Builder({
registry: new Construct_registry()
});
}
});
return Singleton_registry;
});
|
