Reflective Access to Classes in Java

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Reflective Access to Classes
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The reflective information for a class is contained in an instance of the FXClassType class FXClassType is one of several classes that represent JavaFX types, the rest of which are discussed in the Types and Values section Getting Class Information You can get the FXClassType object for a class from the findClass() method of FXContextThe following code gets the FXClassType object for the javafxscene controlControl class (which is part of the GUI runtime) and then prints its name:
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var ctx = FXContextgetInstance(); var textBoxClass = ctxfindClass("javafxscenecontrolTextBox"); println(textBoxClassgetName());
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The output from this code is the full name of the class:
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javafxscenecontrolTextBox
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The findClass() method locates a named class by using the context class loader for the thread from which it is invoked and returns the corresponding FXClassType objectThis means that you can get the class information for any class that your JavaFX application could load If the named class cannot be located, a javalangClassNotFoundException is thrown The getName() method of FXClassType returns the full name of the class that it describes Getting Superclass Information You can discover the classes from which a given class is derived and the Java interfaces that it implements by calling the getSuperClasses() method, which has the following signature1:
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public List<FXClassType> getSuperClasses(boolean all)
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JavaFX reflection is actually implemented in Java, so the API that you ll see in this chapter uses Java syntax
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Context and Classes
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For example, we ll use this method to get the superclasses of the TextBox class, the actual class hierarchy of which is shown in Figure 13-1
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Node
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Parent Resizable (mixin) Control TextOffsets (mixin)
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TextInputControl
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TextInput (mixin)
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Figure 13-1 Class hierarchy for javafxscenecontrolTextBox
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If called with argument false, the getSuperClasses() method returns a list containing a single FXClassType object that represents the immediate superclass of the target class:
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var supers = textBoxClassgetSuperClasses(false); //Immediate superclass println("Superclasses: "); for (s in supers) { println(sgetName()); }
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The preceding code prints the name of the immediate superclass of TextBox:
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javafxscenecontrolTextInputControl
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Calling this method with argument true causes all the superclasses of the TextBox class to be returned:
var supers = textBoxClassgetSuperClasses(true); // All superclasses println("Superclasses: "); for (s in supers) { println(sgetName()); }
13 Reflection
Here s the result of running the preceding modified code:
comsunjavafxruntimeFXBase javalangObject javafxsceneNode javafxsceneParent javafxscenecontrolControl javafxscenecontrolTextBox javafxscenecontrolTextInputControl javafxsceneinputTextInput javafxscenelayoutResizable javafxscenetextTextOffsets
If you compare this list with Figure 13-1, you ll see that the list is not ordered according to the class hierarchy it is, in fact, alphabetical by package and then by class within package Notice also that, perhaps surprisingly, the TextBox class itself appears in this list When a class implements Java interfaces, an FXClassType object for each of those interfaces is included in the superclass informationThe following code declares a JavaFX class called MyDate that is a (trivial) subclass of the Java class javautilDate and then gets and prints its superclass information:
class MyDate extends javautilDate { } var myDateClass = ctxfindClass("javafxreflectionReflectClassMyDate"); supers = myDateClassgetSuperClasses(true); println("MyDate superclasses: "); for (s in supers) { println(sgetName()); }
This class definition appears in the file javafxreflection/ReflectClassfx in the JavaFX Book Desktop project, which means that MyDate is not the script class for that file As you saw in 11, JavaFX Script Classes, the fully qualified name of this class is actually javafxreflectionReflectClassMyDate, so this is the name that must be passed to findClass() to get its FXClassType objectThe output from this code is as follows:
MyDate superclasses: javaioSerializable javalangCloneable javalangComparable javalangObject javautilDate javafxreflectionReflectClassMyDate
As you can see, this list includes the complete class hierarchy from javalangObject through javautilDate to MyDate itself It also contains the interfaces that are implemented by MyDate, which are inherited from javautilDate namely Serializable, Cloneable, and Comparable Because JavaFX does not have the separate concept of an