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annotate src/implab/di/ReferenceDescriptor.js @ 0:fc2517695ee1

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Initial commit, draft import of existing work
author cin
date Thu, 01 Jun 2017 13:20:03 +0300
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children 93fb6c09f2e1
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1 define([
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2 "dojo/_base/declare", "../safe", "./Descriptor", "./ActivationError", "./ValueDescriptor"
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3 ],
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4
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5 function(declare, safe, Descriptor, ActivationError, Value) {
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6 return declare(Descriptor, {
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7 _name : null,
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8 _lazy : false,
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9 _optional : false,
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10 _default : undefined,
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11
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12 constructor : function(name, lazy, optional, def, services) {
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13 safe.argumentNotEmptyString(name, "name");
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14 this._name = name;
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15 this._lazy = Boolean(lazy);
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16 this._optional = Boolean(optional);
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17 this._default = def;
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18 this._services = services;
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19 },
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20
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21 activate : function(context, name) {
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22 var me = this;
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23
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24 context.enter(name, this, true);
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25
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26 // добавляем сервисы
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27 if (me._services) {
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28 for ( var p in me._services) {
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29 var sv = me._services[p];
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30 context.register(p, sv instanceof Descriptor ? sv : new Value(sv, false));
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31 }
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32 }
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33
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34 if (me._lazy) {
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35 // сохраняем контекст активации
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36 context = context.clone();
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37 return function(cfg) {
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38 // защищаем контекст на случай исключения в процессе
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39 // активации
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40 var ct = context.clone();
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41 try {
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42 if (cfg)
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43 safe.each(cfg, function(v, k) {
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44 ct.register(k, v instanceof Descriptor ? v : new Value(v, false));
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45 });
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46 return me._optional ? ct.getService(me._name, me._default) : ct
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47 .getService(me._name);
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48 } catch (error) {
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49 throw new ActivationError(me._name, ct.getStack(), error);
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50 }
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51 };
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52 }
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53
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54 var v = me._optional ? context.getService(me._name, me._default) : context
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55 .getService(me._name);
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56 context.leave(me);
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57 return v;
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58 },
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59
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60 isInstanceCreated : function() {
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61 return false;
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62 },
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63
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64 toString : function() {
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65 var opts = [];
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66 if (this._optional)
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67 opts.push("optional");
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68 if (this._lazy)
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69 opts.push("lazy");
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70
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71 var parts = [
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72 "@ref "
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73 ];
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74 if (opts.length) {
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75 parts.push("{");
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76 parts.push(opts.join());
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77 parts.push("} ");
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78 }
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79
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80 parts.push(this._name);
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81
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82 if (!safe.isNull(this._default)) {
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83 parts.push(" = ");
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84 parts.push(this._default);
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85 }
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86
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87 return parts.join("");
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88 }
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89 });
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90 });