JavaFX Script Classes in Java

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The log() functions form the bulk of the API of the mixinThey allow subclasses to write log entries to the Logger given by the logger variable Encapsulating the creation of the logger in the mixin class frees the class that uses it (the mixee class) from the responsibility of managing the logger Within the implementation of the mixin class, the keyword this is typed to the mixin class itself and can be used explicitly or implicitly to access variables and functions defined in the mixin On line 13, for example, the reference to level is a shorthand for thislevel and returns the value of the level variable in the same mixin instance Listing 11-6 shows a class that uses the Logging mixin
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Listing 11-6
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Using a Mixin Class
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package javafxclasses; import javautilloggingLevel; public class LoggedClassWithMixin1 extends Logging { override var level = LevelWARNING; init { log("In init"); } } function run() { // Test code var c = LoggedClassWithMixin1 {}; println(clevel); println(cisLogging()); }
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The mixin class is incorporated into LoggedClassWithMixin1 by using the extends keywordThe effect of this is to make the API and variables of the mixin available to the mixee class in the same way as if the mixin class had been an ordinary base class of the mixee In this case, most of the mixin functions are protected and are therefore visible only to the mixee class, but the isLogging() function and the level variable of the mixin are public and therefore become part of the public API of the LoggedClassWithMixin1 class This is illustrated in the run() function on lines 13 to 15 of Listing 11-6, which instantiates an instance of this class and then accesses the level variable and the isLogging() function by using the variable c, which refers to the mixee class instance In this case, access is possible because the test code and the test class are in the same package, but this same code would work even if it were in a script in a different package Line 6 of Listing 11-6 shows that the initial value of a mixin variable, in this case the level variable, can be overridden in the mixee class, in the same way as the initial value of a subclass variable can be changed, subject to the normal access rulesThe result of running this example is as follows (the output may not appear in the order shown here):
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Mixins
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26-May-2010 20:24:14 javafxclassesLogging log$impl WARNING: In init WARNING true
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The first two lines are the result of the log() call in the init block of the mixee class on line 8 of Listing 11-6The standard preamble on line 1 indicates where the call came from (the log() function of the Logging class), and this is followed on line 2 by the actual logged messageThe WARNING text at the start of this line is the logging level used when the entry was made, which shows that the variable override on line 6 of Listing 11-6 was effective Lines 3 and 4 of the output show the value of the level variable and the result of calling the isLogging() function, on lines 14 and 15 of Listing 11-6 Mixin variables can be assigned values in an object initializer in the same way as variables of the mixee class Listing 11-7 illustrates this
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Listing 11-7
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Initializing a Variable of a Mixin Class
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package javafxclasses; import javautilloggingLevel; public class LoggedClassWithMixin2 extends Logging { init { log("In init"); } } function run() { var c = LoggedClassWithMixin2 { level: LevelFINE }; println("Level is {clevel}"); }
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In this example, the class LoggeClassWithMixin2 is another mixee that incorporates the Logging mixin In this case, the level variable is not overridden in the class definition Instead, its value is set from the object literal on lines 12 to 14The output from this example confirms that this assignment is effective:
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