| 1 | class Injector
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| 2 | constructor: (@binders...) ->
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| 3 | @_singletons = {}
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| 4 |
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| 5 | getInstance: (cls, args...) ->
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| 6 | for binder in @binders
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| 7 | for binding in binder.bindings
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| 8 | instance = @_resolve(cls, binding)
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| 9 | if instance? then return instance
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| 10 |
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| 11 | unless cls.prototype? then throw Error('Could not resolve')
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| 12 | @_createNew(cls, undefined, args...)
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| 13 |
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| 14 | _createNew: (cls, scope, args...) ->
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| 15 | if cls is Injector then return this
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| 16 | if @_singletons[cls] then return @_singletons[cls]
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| 17 |
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| 18 | ptype = ->
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| 19 | ptype.prototype = cls.prototype
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| 20 | instance = new ptype()
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| 21 | @_injectFields(cls.prototype, instance)
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| 22 | cls.apply(instance, args)
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| 23 |
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| 24 | if scope?.toUpperCase?() is 'SINGLETON' or cls.scope?.toUpperCase?() is 'SINGLETON'
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| 25 | @_singletons[cls] = instance
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| 26 |
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| 27 | instance
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| 28 |
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| 29 | _resolve: (cls, binding) ->
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| 30 | if binding.matches(cls)
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| 31 | defaultFactory = =>
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| 32 | @_createNew(binding.impl, binding.scope)
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| 33 | binding.create(defaultFactory)
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| 34 |
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| 35 | _injectFields: (ptype, instance) ->
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| 36 | for k, v of ptype
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| 37 | if v? and v._requiresInjection_
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| 38 | instance[k] = @getInstance(v.cls, v.args...)
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| 39 |
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| 40 | module.exports = Injector
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