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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'
], function(declare, array, lang, construct) {
var Builder = declare(null, {
/**
* Builds objects based on specication.
*
* @class
* @name Builder
*/
/**
* Construct registry
* @property ./Construct_registry
*/
registry: null,
/**
* Build object based on spec.
*
* @param {String|Function|Object} Build spec
*
* String: type name, queries registry
* Function: factory or constructor
* Object: spec object
*
* Build control properies of spec object:
* $constructor: Function
* $factory: Function
* $mixim_spec: Boolean
* $type: String
* $pre_ops: []
* $post_ops: []
*
* All other properties will be passed to object construction method.
*/
build: function(spec) {
var cs = this._get_construction_spec(spec);
var obj = this._build(cs);
return obj;
},
_get_construction_spec: function(spec) {
var cs = {};
if (typeof spec === 'function') {
// spec constructor or factory
if (construct.is_constructor(spec)) {
cs.constructor = spec;
} else {
cs.factory = spec;
}
} else if (typeof spec === 'string') {
// spec is type name
cs = this._query_registry(spec);
} else if (typeof spec === 'object') {
var c = spec.$constructor,
f = spec.$factory,
m = spec.$mixim_spec,
t = spec.$type,
pre = spec.$pre_ops,
post = spec.$post_ops;
var s = lang.clone(spec);
delete s.$constructor;
delete s.$factory;
delete s.$mixim_spec;
delete s.$type;
delete s.$pre_ops;
delete s.$post_ops;
if (c) {
cs.constructor = c;
cs.spec = s;
}
else if (f) {
cs.factory = f;
cs.spec = s;
}
else if (t) {
cs = this._query_registry(t);
if (cs.spec && m) {
lang.mixin(cs.spec, s);
} else {
cs.spec = s;
}
}
cs.pre_ops = cs.pre_ops || [];
cs.post_ops = cs.post_ops || [];
if (pre) cs.pre_ops.push.call(cs.pre_ops, pre);
if (pre) cs.post_ops.push.call(cs.post_ops, post);
}
return cs;
},
/**
* Queries registry and returns copy of construction specification
*/
_query_registry: function(type) {
if (this.registry) {
var cs = this.registry.get(type);
if (!cs) throw construct.no_cs_for_type_error(type);
cs = construct.copy_cs(cs);
return cs;
} else {
throw {
error: 'Build error: construct registry required',
builder: this
};
}
},
_build: function(construction_spec) {
var cs = construction_spec,
obj = null,
i;
if (cs.pre_ops) {
for (i=0; i<cs.pre_ops.length; i++) {
var preop = cs.pre_ops[i];
var preop_t = typeof preop;
if (preop_t === 'function') {
cs.spec = preop(cs.spec || {});
} else if (preop_t === 'object') {
lang.mixin(cs.spec, preop);
}
}
}
cs.spec = cs.spec || {};
if (cs.factory && typeof cs.factory === 'function') {
obj = cs.factory(cs.spec);
} else if (cs.constructor && typeof cs.constructor === 'function') {
obj = new cs.constructor(cs.spec);
} else {
throw {
error: 'Build error: missing or invalid constructor or factory',
spec: cs
};
}
if (cs.post_ops && obj) {
for (i=0; i<cs.post_ops.length; i++) {
var postop = cs.post_ops[i];
var postop_t = typeof postop;
if (postop_t === 'function') {
obj = postop(obj);
} else if (postop_t === 'object') {
lang.mixin(obj, postop);
}
}
}
return obj;
},
/**
* Constructor
*
* set spec.registry to use Construct_registry instance
*/
constructor: function(spec) {
spec = spec || {};
if (spec.registry) this.registry = spec.registry;
}
});
return Builder;
});
|
