Reflection in Java

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function type: function(Integer,Integer):Integer Function name: say script function false function type: function(javalangString):Void Function name: sayHello script function false function type: function():Void
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Sometimes, it is useful to be able to get a subset of the variables and functions in a class It is possible to do this by creating an FXMemberFilter that selects only those items that you are interested inThe key to the FXMemberFilter class is the following method:
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public boolean accept(FXMember member)
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This method must be implemented to return true if the variable or function passed as its argument should be included in the filtered set of objects and false if it should not The default implementation of this method allows the FXMemberFilter object to be configured so that it can be used to provide the same functionality as the search methods that you have already seenTo implement a custom search, you need to create your own filter (as either a Java or JavaFX class) that overrides this method Suppose, for example, that you want to write a filter that returns all methods in a class whose name starts with multThis is exactly what an IDE would need to do to provide code completion in a JavaFX code editorThe code in Listing 13-2 is a JavaFX implementation of a filter that accepts only those functions passed to it for which the name begins with the value in its match variable2
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Listing 13-2
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1 2 3 4 5 6 7 8 9 10 11
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A Filter That Accepts Functions Based on the Function Name
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class FunctionNameFilter extends FXMemberFilter { public-init var match:String; public override function accept(member:FXMember):Boolean { if (not (member instanceof FXFunctionMember)) { return false; } return match == "" or membergetName()startsWith(match); } }
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You could make this example more interesting by accepting a regular expression instead of just the leading part of the name
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Variables and Functions
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The interesting code in this example is in lines 4 through 10 of the accept() functionThis function is called with every candidate member (variable or function) from a specific class It immediately excludes variable members by testing the type of its member argument, and then checks whether the name of the function is acceptable and returns true if it isAs implemented here, setting the match property of this filter to the empty string has the effect of accepting all functions You use a filter by passing it to either of the following FXClassType functions:
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public javautilList getFunctions(FXMemberFilter filter, boolean all) public javautilList getVariables(FXMemberFilter filter, boolean all)
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The argument all should be false if only the functions or variables of the class itself should be considered for a match, or true to allow the functions or variables of both the class and its superclasses to be included Here s an example that shows how to use this filter to find all the functions in the class shown in Listing 13-1 whose names begin with mult
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var var var var for ctx = FXContextgetInstance(); classType = ctxfindClass("javafxreflectionFunctionsAndVariables"); filter = FunctionNameFilter { match: "mult" }; matches = classTypegetFunctions(filter, true); (matched in matches) { println("Matched: {matchedgetName()}"); println(" signature: {matchedgetType()}");
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The output from this code shows that the FunctionsAndVariables class has two such functions:
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Matched: multiply signature: function(Integer,Integer):Integer Matched: multiply signature: function(Number,Number):Number
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Although this example filtered only on the function name, it is also possible to consider the number and types of the function s argumentsThis information can be obtained from the FXMember object passed to the filter s accept() function
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Reflecting on Variables and Functions
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In the previous two sections, you have seen how to get information on the variables and functions in a classThe APIs you have seen so far return either variable or function information Sometimes, it is useful to be able to process all members of a class, both variables and functionsYou can do this by using the getMembers() functions of FXClassType, which both return a list of FXMember objects:
public javautilList getMembers(boolean all) public javautilList getMembers(FXMemberFilter filter, boolean all);