FXFunctionValueThis Result of invoking add() via FXFunctionValue is 3 in Java

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FXFunctionValueThis Result of invoking add() via FXFunctionValue is 3
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The FXObjectValue argument passed to the getValue() method in this code is null because aFunction is a script variable
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Invoking a Member Function To invoke a member function, you first need to get its FXFunctionMember object FXFunctionMember has a method that returns an FXFunctionValue that you can then use to invoke the method on a given instance of its owning class:
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public FXFunctionValue asFunction(FXObjectValue targetInstance);
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The following code demonstrates the process:
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1 2 3 4 5 6 7 8 9 10 11 12 13 var integerType = ctxgetIntegerType(); var intMultMember = classTypegetFunction("multiply", [integerType, integerType]); objectValue = (ctx as FXLocalContext)mirrorOf(instance); functionValue = intMultMemberasFunction(objectValue); arg1 = ctxmirrorOf(2); arg2 = ctxmirrorOf(3); value = functionValueapply([arg1, arg2]); actualValue = getActualValue(value); println( "Result of multiply() via FXFunctionMember is {actualValue}");
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Lines 1 and 2 get the FXFunctionMember object for the instance function multiply() of the FunctionsAndVariables class shown in Listing 13-1 In this case, we want the variant that accepts two parameters of type Integer Line 5 gets an FXObjectValue wrapping the instance of the FunctionsAndVariables class on which the function is to be invoked Line 6 uses the asFunction() method of FXFunctionMember to get an FXFunctionValue object that can be used to call the multiply() function on the specified instance of the FunctionsAndVariables class Note that in this step, if the FXFunctionMember represented a script function, you would pass a null instance reference to the asFunction() method The rest of the code is the same as that shown in the previous section to invoke a function represented by an FXFunctionValue objectThe result of running this code is as follows:
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Result of multiply() via FXFunctionMember is 6
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Invoking a Function Given an FXObjectValue In the code shown in the previous section, we obtained an FXFunctionMember for an instance function and applied it to a specific instance of its owning class to get an FXFunctionValue object, which was then used to invoke the functionTo make this possible, the instance on which the function was to be called was converted to an FXObjectValue FXObjectValue has two methods that simplify the task of reflectively invoking an instance function of the object that it refers toThe first of these is declared as follows:
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public FXValue invoke(FXFunctionMember method, FXValue[] args);
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Using this method, we can rewrite the example shown in the last section like this:
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1 2 3 4 5 6 7 8 var integerType = ctxgetIntegerType(); var intMultMember = classTypegetFunction("multiply", [integerType, integer Type]); objectValue = (ctx as FXLocalContext)mirrorOf(instance); value = objectValueinvoke(intMultMember, [ctxmirrorOf(4), ctxmirrorOf(5)]); actualValue = getActualValue(value); println("Result of multiply() via FXObjectValue #1:{actualValue}");
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Lines 1 through 4 are the same as the earlier example they get the for the required function and create an FXObjectValue for the target object instanceThe difference is on line 5 Instead of getting an FXFunctionValue from the FXFunctionMember, we just call the invoke() method of FXObjectValue, passing it the function to be called in the form of the FXFunctionMember object, together with the arguments to be passed to the function FXObjectValue has another variant of invoke() that makes it even easier to call an instance function:
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FXFunctionMember public FXValue invoke(String name, FXValue[] args);
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In this case, we supply only the name of the target function and the required arguments the steps needed to get the FXFunctionValue are performed internally Using this method, the preceding code can be rewritten like this:
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1 2 3 4 5 objectValue = (ctx as FXLocalContext)mirrorOf(instance); value = objectValueinvoke("multiply", [ctxmirrorOf(4), ctxmirrorOf(5)]); actualValue = getActualValue(value); println("Result of multiply() via FXObjectValue #2: {actual Value}");
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As you can see, this is much simpler than all the previous examples, because most of the work is done by the invoke() method itself Note that the actual types of the arguments passed to the invoke() method, in this case two Integers, are used to choose between the two variants of the multiply() function in the FunctionsAndVariables class
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