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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) {
/**
* Registry for storing singleton instances of various items based
* on their type.
*
* @class _base.Singleton_registry
*/
var Singleton_registry = declare(null, {
/**
* Internal map for instances
* @protected
* @property {Object}
*/
_map: {},
/**
* Builder used for building new instances. Builder has to have a
* Constructor registry set.
* @property {_base.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 {string|Object} type Type's name. Or the the object itself.
* @return {Object|null}
*/
get: function(type) {
if (typeof type === 'object') return type;
var obj = this._map[type];
if (!obj) {
if (!this.builder) return null;
try {
obj = this._map[type] = this.builder.build(type);
} catch (e) {
if (e.code === 'no-ctor-fac') obj = null;
else {
window.console.error('Error while building: ' + type);
throw e;
}
}
}
return obj;
},
/**
* Set object of given type - overwrites existing
*
* @param {string} type
* @param {Mixed} object
*/
set: function (type, obj) {
this._map[type] = obj;
},
/**
* Removes object of given type from registry
*
* @param {string} type
*/
remove: function(type) {
var undefined;
this._map[type] = undefined;
},
/**
* Registers construction specification
*
* @param {string|Object} type type or construction spec
* @param {Function} func ctor or factory function
* @param {Object} [default_spec] default spec object for given type
*
* @return {Object}
*/
register: function(type, func, default_spec) {
this._check_builder();
this.builder.registry.register(type, func, default_spec);
},
/**
* Makes a copy of construct specification of original type. Extends
* it with values in supplied construct specification.
*
* @param {string} org_type Original type
* @param {string} new_type New type
* @param {Object} construct_spec Construction specification
*/
copy: function(org_type, new_type, construct_spec) {
this._check_builder();
this.builder.registry.copy(org_type, new_type, construct_spec);
},
/**
* Create new construction specification based on an existing one and
* a specification object. Save it as a new type.
* @param {string|Function} type New type or a callback to get
* the type: `callback(spec)`
* @param {Object} spec Construction specification
*/
register_from_spec: function(type, spec) {
this._check_builder();
var cs = this.builder.merge_spec(spec, true);
if (typeof type === 'function') {
cs.type = type(cs.spec);
} else {
cs.type = type;
}
this.builder.registry.register(cs);
},
_check_builder: function() {
if (!lang.exists('builder.registry', this)) {
throw {
error: 'Object Initialized Exception: builder not initalized',
context: this
};
}
},
constructor: function(spec) {
spec = spec || {};
this._map = {};
this.builder = spec.builder || new Builder({
registry: new Construct_registry()
});
}
});
return Singleton_registry;
});
|
