annotate src/implab/di/ServiceDescriptor.js @ 21:7c22fc01fcec

rewritten ./text/template-compile
author cin
date Thu, 30 Nov 2017 11:01:22 +0300
parents 00779cb63b12
children
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rev   line source
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1 define(
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2 [
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3 "../declare",
0
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4 "../safe",
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5 "./Descriptor",
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6 "./ValueDescriptor"
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7 ],
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8
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9 function (declare, safe, Descriptor, Value) {
0
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10 var SINGLETON_ACTIVATION = 1,
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11 CONTAINER_ACTIVATION = 2,
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12 CONTEXT_ACTIVATION = 3,
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13 CALL_ACTIVATION = 4,
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14 HIERARCHY_ACTIVATION = 5;
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15
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16 var injectMethod = function (target, method, context, args) {
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17 var m = target[method];
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18 if (!m)
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19 throw new Error("Method '" + method + "' not found");
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20
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21 if (args instanceof Array)
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22 m.apply(target, context.parse(args, "." + method));
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23 else
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24 m.call(target, context.parse(args, "." + method));
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25 };
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26
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27 var makeClenupCallback = function (target, method) {
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28 if (typeof (method) === "string") {
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29 return function () {
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30 target[method]();
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31 };
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32 } else {
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33 return function () {
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34 method(target);
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35 };
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36 }
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37 };
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38
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39 var cacheId = 0;
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40
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41 var cls = declare(
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42 Descriptor, {
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43 _instance: null,
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44 _hasInstance: false,
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45 _activationType: CALL_ACTIVATION,
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46 _services: null,
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47 _type: null,
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48 _typeMap: null,
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49 _factory: null,
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50 _params: undefined,
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51 _inject: null,
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52 _cleanup: null,
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53 _cacheId: null,
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54 _owner: null,
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55
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56 constructor: function (opts) {
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57 safe.argumentNotNull(opts, "opts");
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58 safe.argumentNotNull(opts.owner, "opts.owner");
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59
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60 this._owner = opts.owner;
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61
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62 if (!(opts.type || opts.factory))
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63 throw new Error(
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64 "Either a type or a factory must be specified");
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65
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66 if (typeof (opts.type) === "string" && !opts.typeMap)
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67 throw new Error(
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68 "The typeMap is required when the type is specified by its name");
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69
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70 if (opts.activation)
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71 this._activationType = opts.activation;
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72 if (opts.type)
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73 this._type = opts.type;
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74 if (opts.params)
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75 this._params = opts.params;
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76 if (opts.inject)
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77 this._inject = opts.inject instanceof Array ? opts.inject : [opts.inject];
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78 if (opts.services)
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79 this._services = opts.services;
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80 if (opts.factory)
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81 this._factory = opts.factory;
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82 if (opts.typeMap)
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83 this._typeMap = opts.typeMap;
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84 if (opts.cleanup) {
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85 if (!(typeof (opts.cleanup) === "string" || opts.cleanup instanceof Function))
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86 throw new Error(
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87 "The cleanup parameter must be either a function or a function name");
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88
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89 this._cleanup = opts.cleanup;
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90 }
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91
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92 this._cacheId = ++cacheId;
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93 },
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94
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95 activate: function (context, name) {
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96
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97 // if we have a local service records, register them first
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98
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99 var instance;
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100
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101 switch (this._activationType) {
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102 case 1: // SINGLETON
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103 // if the value is cached return it
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104 if (this._hasInstance)
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105 return this._instance;
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106
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107 var tof = this._type || this._factory;
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108
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109 // create the persistent cache identifier for the type
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110 if (safe.isPrimitive(tof))
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111 this._cacheId = this._type;
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112 else
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113 this._cacheId = safe.oid(tof);
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114
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115 // singletons are bound to the root container
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116 var container = context.container.getRootContainer();
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117
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118 if (container.has(this._cacheId)) {
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119 instance = container.get(this._cacheId);
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120 } else {
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121 instance = this._create(context, name);
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122 container.store(this._cacheId, instance);
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123 if (this._cleanup)
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124 container.onDispose(
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125 makeClenupCallback(instance, this._cleanup));
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126 }
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127
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128 this._hasInstance = true;
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129 return (this._instance = instance);
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130
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131 case 2: // CONTAINER
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132 //return a cached value
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133 if (this._hasInstance)
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134 return this._instance;
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135
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136 // create an instance
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137 instance = this._create(context, name);
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138
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139 // the instance is bound to the container
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140 if (this._cleanup)
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141 this._owner.onDispose(
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142 makeClenupCallback(instance, this._cleanup));
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143
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144 // cache and return the instance
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145 this._hasInstance = true;
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146 return (this._instance = instance);
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147 case 3: // CONTEXT
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148 //return a cached value if one exists
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149 if (context.has(this._cacheId))
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150 return context.get(this._cacheId);
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151 // context context activated instances are controlled by callers
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152 return context.store(this._cacheId, this._create(
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153 context,
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154 name));
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155 case 4: // CALL
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156 // per-call created instances are controlled by callers
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157 return this._create(context, name);
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158 case 5: // HIERARCHY
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159 // hierarchy activated instances are behave much like container activated
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160 // except they are created and bound to the child container
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161
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162 // return a cached value
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163 if (context.container.has(this._cacheId))
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164 return context.container.get(this._cacheId);
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165
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166 instance = this._create(context, name);
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167
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168 if (this._cleanup)
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169 context.container.onDispose(makeClenupCallback(
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170 instance,
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171 this._cleanup));
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172
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173 return context.container.store(this._cacheId, instance);
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174 default:
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175 throw "Invalid activation type: " + this._activationType;
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176 }
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177 },
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178
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179 isInstanceCreated: function () {
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180 return this._hasInstance;
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181 },
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182
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183 getInstance: function () {
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184 return this._instance;
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185 },
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186
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187 _create: function (context, name) {
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188 context.enter(name, this, Boolean(this._services));
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189
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190 if (this._activationType != CALL_ACTIVATION &&
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191 context.visit(this._cacheId) > 0)
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192 throw new Error("Recursion detected");
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193
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194 if (this._services) {
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195 for (var p in this._services) {
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196 var sv = this._services[p];
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197 context.register(p, sv instanceof Descriptor ? sv : new Value(sv, false));
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198 }
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199 }
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200
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201 var instance;
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202
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203 if (!this._factory) {
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204 var ctor, type = this._type;
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205
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206 if (typeof (type) === "string") {
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207 ctor = this._typeMap[type];
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208 if (!ctor)
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209 throw new Error("Failed to resolve the type '" +
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210 type + "'");
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211 } else {
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212 ctor = type;
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213 }
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214
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215 if (this._params === undefined) {
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216 this._factory = function () {
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217 return new ctor();
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218 };
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219 } else if (this._params instanceof Array) {
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220 this._factory = function () {
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221 var inst = Object.create(ctor.prototype);
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222 var ret = ctor.apply(inst, arguments);
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223 return typeof (ret) === "object" ? ret : inst;
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224 };
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225 } else {
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226 this._factory = function (param) {
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227 return new ctor(param);
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228 };
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229 }
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230 }
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231
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232 if (this._params === undefined) {
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233 instance = this._factory();
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234 } else if (this._params instanceof Array) {
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235 instance = this._factory.apply(this, context.parse(
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236 this._params,
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237 ".params"));
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238 } else {
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239 instance = this._factory(context.parse(
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240 this._params,
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241 ".params"));
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242 }
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243
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244 if (this._inject) {
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245 this._inject.forEach(function (spec) {
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246 for (var m in spec)
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247 injectMethod(instance, m, context, spec[m]);
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248 });
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249 }
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250
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251 context.leave();
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252
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253 return instance;
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254 },
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255
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256 // @constructor {singleton} foo/bar/Baz
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257 // @factory {singleton}
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258 toString: function () {
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259 var parts = [];
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260
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261 parts.push(this._type ? "@constructor" : "@factory");
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262
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263 parts.push(activationNames[this._activationType]);
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264
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265 if (typeof (this._type) === "string")
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266 parts.push(this._type);
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267
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268 return parts.join(" ");
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269 }
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270
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271 });
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272
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273 cls.SINGLETON = SINGLETON_ACTIVATION;
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274 cls.CONTAINER = CONTAINER_ACTIVATION;
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275 cls.CONTEXT = CONTEXT_ACTIVATION;
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276 cls.CALL = CALL_ACTIVATION;
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277 cls.HIERARCHY = HIERARCHY_ACTIVATION;
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278
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279 var activationNames = [
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280 "",
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281 "{singleton}",
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282 "{container}",
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283 "{context}",
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284 "{call}",
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285 "{hierarchy}"
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286 ];
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287
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288 return cls;
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289 });