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define([
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"../declare", "../safe", "./Descriptor", "./ActivationError", "./ValueDescriptor"
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],
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function(declare, safe, Descriptor, ActivationError, Value) {
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return declare(Descriptor, {
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_name : null,
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_lazy : false,
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_optional : false,
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_default : undefined,
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constructor : function(name, lazy, optional, def, services) {
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safe.argumentNotEmptyString(name, "name");
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this._name = name;
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this._lazy = Boolean(lazy);
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this._optional = Boolean(optional);
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this._default = def;
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this._services = services;
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},
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activate : function(context, name) {
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var me = this;
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context.enter(name, this, true);
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// добавляем сервисы
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if (me._services) {
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for ( var p in me._services) {
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var sv = me._services[p];
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context.register(p, sv instanceof Descriptor ? sv : new Value(sv, false));
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}
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}
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if (me._lazy) {
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// сохраняем контекст активации
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context = context.clone();
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return function(cfg) {
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// защищаем контекст на случай исключения в процессе
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// активации
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var ct = context.clone();
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try {
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if (cfg)
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safe.each(cfg, function(v, k) {
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ct.register(k, v instanceof Descriptor ? v : new Value(v, false));
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});
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return me._optional ? ct.getService(me._name, me._default) : ct
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.getService(me._name);
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} catch (error) {
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throw new ActivationError(me._name, ct.getStack(), error);
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}
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};
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}
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var v = me._optional ? context.getService(me._name, me._default) : context
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.getService(me._name);
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context.leave(me);
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return v;
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},
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isInstanceCreated : function() {
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return false;
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},
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toString : function() {
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var opts = [];
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if (this._optional)
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opts.push("optional");
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if (this._lazy)
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opts.push("lazy");
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var parts = [
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"@ref "
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];
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if (opts.length) {
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parts.push("{");
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parts.push(opts.join());
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parts.push("} ");
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}
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parts.push(this._name);
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if (!safe.isNull(this._default)) {
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parts.push(" = ");
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parts.push(this._default);
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}
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return parts.join("");
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}
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});
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});
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