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dpavlin |
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/* |
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* An Implementation of Traits |
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* see http://www.iam.unibe.ch/~scg/cgi-bin/scgbib.cgi?query=nathanael+traits+composable+units+ecoop |
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* |
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* Current Composition rules: |
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* - At compile time we override existing (at the time of rule application) methods |
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* - At runtime we dont |
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*/ |
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Class("Joose.Role", { |
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isa: Joose.Class, |
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has: ["requiresMethodNames", "methodModifiers"], |
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methods: { |
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wrapMethod: function () { |
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this.methodModifiers.push(arguments) |
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var test = this.methodModifiers |
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}, |
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requiresMethod: function (methodName) { |
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var bool = false; |
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Joose.A.each(this.requiresMethodNames, function (name) { |
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if(methodName == name) { |
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bool = true |
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} |
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}) |
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return bool |
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}, |
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addInitializer: Joose.emptyFunction, |
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defaultClassFunctionBody: function () { |
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var f = function () { |
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throw new Error("Roles may not be instantiated.") |
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}; |
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f.toString = function () { return this.meta.className() } |
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return f |
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}, |
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addSuperClass: function () { |
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throw new Error("Roles may not inherit from a super class.") |
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}, |
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initialize: function () { |
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this._name = "Joose.Role" |
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this.requiresMethodNames = []; |
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this.methodModifiers = []; |
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}, |
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addRequirement: function (methodName) { |
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this.requiresMethodNames.push(methodName) |
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}, |
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apply: function (object) { |
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if(joose.isInstance(object)) { |
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// Create an anonymous subclass ob object's class |
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object.detach(); |
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object.meta.addRole(this.getClassObject()); |
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} else { |
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// object is actually a class |
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var me = this; |
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var names = this.getMethodNames(); |
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//alert("Super"+me.name + " -> "+classObject.meta.name +"->" + names) |
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Joose.A.each(names, function (name) { |
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var m = me.dispatch(name); |
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if(!object.meta.hasMethod(name) || object.meta.getMethodObject(name).isFromSuperClass()) { |
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object.meta.addMethodObject(m.meta) |
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} |
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}) |
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Joose.A.each(this.methodModifiers, function (paras) { |
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object.meta.wrapMethod.apply(object.meta, paras) |
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}) |
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} |
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}, |
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hasRequiredMethods: function (classObject, throwException) { |
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var me = this |
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var complete = true |
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Joose.A.each(this.requiresMethodNames, function (value) { |
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var found = classObject.meta.can(value) |
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if(!found) { |
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if(throwException) { |
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throw("Class "+classObject.meta.className()+" does not fully implement the role "+me.meta.className()+". The method is "+value+" missing.") |
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} |
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complete = false |
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return |
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} |
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}) |
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return complete |
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}, |
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isImplementedBy: function (classObject, throwException) { |
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var complete = this.hasRequiredMethods(classObject, throwException); |
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if(complete) { |
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complete = this.implementsMyMethods(classObject); |
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} |
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return complete |
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} |
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} |
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}) |
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Joose.Role.anonymousClassCounter = 0; |
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