Creating and Accessing Sequences in Java

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Creating and Accessing Sequences
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This section describes how to use the Reflection APIs to retrieve values from a sequence and to create a new sequence with a given element type Accessing a Sequence If you use the Reflection APIs to read a sequence variable or to invoke a function that returns a sequence, you will get a value of type FXSequenceValueThe following example declares a script variable that is a sequence of Strings in a class called
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13 Reflection
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SequenceReflection
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and then gets an FXSequenceValue that refers to the content of
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that variable
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// Declare a sequence var sequence = ["A", "B", "C", "D"]; // Get the value of the sequence var ctx = FXContextgetInstance(); var classType = ctxfindClass("javafxreflectionSequenceReflection"); var sequenceMember = classTypegetVariable("sequence"); var value = sequenceMembergetValue(null); var seqValue = value as FXSequenceValue;
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You can get the type of the sequence from the getType() method of actual type returned by this method is FXSequenceType, which provides a method called getComponentType() that returns the type of the elements in the sequence:
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FXSequenceValueThe // Get the sequence type var seqType = seqValuegetType() as FXSequenceType; var elementType = seqTypegetComponentType(); println("Sequence type is {seqType}"); println("Element type is {elementType}");
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The result is the following:
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Sequence type is javalangString[] Element type is class javalangString
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FXSequenceValue FXValue:
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To get the individual elements, you first call the getItemCount() method of the object and then call getItem() to retrieve each element as an
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// Get and print the elements println("Number of elements: {seqValuegetItemCount()}"); for (i in [0<seqValuegetItemCount()]) { var elementValue = seqValuegetItem(i); var actualValue = getActualValue(elementValue); println(" Element {i}: {actualValue}"); }
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The preceding code retrieves all the elements in the order in which they appear in the sequence:
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Number of Element Element Element Element elements: 4 0: A 1: B 2: C 3: D
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Using Reflection
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Creating a Sequence The FXContext class provides two methods that enable you to dynamically construct sequences One of these constructs the sequence in a single step, while the other returns a class that has methods that allow you to construct a sequence piece by piece4 The makeSequence() method constructs a sequence from a set of values and an element type:
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public FXValue makeSequence(FXType elementType, FXValue[] values)
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Here s an example that creates and initializes a sequence of Integer types:
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var intType = ctxgetIntegerType(); var values:FXValue[] = [ctxmirrorOf(1), ctxmirrorOf(2), ctxmirrorOf(3)]; value = ctxmakeSequence(intType, values);
This code is equivalent to the following explicit declaration:
var seq:Integer[] = [1, 2, 3];
The elements provided can themselves be FXSequenceValues, in which case the elements of the nested sequence are flattened into the one being created, or nullA null entry is effectively ignored (or, if you prefer, treated as an empty nested sequence), so the following code creates the same sequence as that shown previously:
var intType = ctxgetIntegerType(); var values:FXValue[] = [ctxmirrorOf(1), ctxmirrorOf(2), null as FXType, ctxmirrorOf(3)]; value = ctxmakeSequence(intType, values);
It does not make much sense to use the makeSequence() method in a JavaFX application because it requires a sequence as its input simply returns a copy of that sequence This method is useful if you want to construct a JavaFX sequence from Java code, because in that case you would supply a Java array containing the values that will make up the sequence An alternative approach that does not involve the use of an existing sequence is provided by the makeSequenceBuilder() method:
public FXSequenceBuilder makeSequenceBuilder(FXType elementType) FXSequenceBuilder is a class in the javafxreflect package that lets you build a sequence by adding individual valuesAt the end, you use its getSequence() method to
There is also a third method, makeSequenceValue(), which is not covered here because it doesn t add anything useful to the functionality provide by makeSequence()
13 Reflection
get the completed sequence Here s an example that illustrates the use of this class to construct the same sequence of three integer values as in the preceding one:
var builder = ctxmakeSequenceBuilder(intType); builderappend(ctxmirrorOf(1)); builderappend(ctxmirrorOf(2)); builderappend(ctxmirrorOf(3)); value = buildergetSequence();
All the values passed to the append() method must be assignable to the element type of the sequence If any of them is not, a ClassCastException is thrown It is legal to call the append() method with an argument that is an FXSequenceValue, provided that its element type is compatible with that of the sequence being constructedThe effect is to flatten the supplied sequence into the new one It is not legal to call the append() method with a null argument The getSequence() method returns an FXValue, which is actually an FXSequenceValue Its component type is the one supplied to the makeSequenceBuilder() method, and its elements are the ones supplied by the append() calls, in the order in which they were addedAfter the getSequence() method has been called, attempts to add more elements will result in an IllegalStateException Only the first call to getSequence() will return a useful value; subsequent calls return null