https://openjdk.java.net/projects/openjfx/javafx-graphics/: OpenJFX JavaFX
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public abstract class com.sun.javafx.scene.traversal.TopMostTraversalEngine extends com.sun.javafx.scene.traversal.TraversalEngine
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.sun.javafx.scene.traversal.TopMostTraversalEngine
  super_class: com.sun.javafx.scene.traversal.TraversalEngine
{
  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
         0: .line 52
            aload 0 /* this */
            getstatic com.sun.javafx.scene.traversal.TopMostTraversalEngine.DEFAULT_ALGORITHM:Lcom/sun/javafx/scene/traversal/Algorithm;
            invokespecial com.sun.javafx.scene.traversal.TraversalEngine.<init>:(Lcom/sun/javafx/scene/traversal/Algorithm;)V
         1: .line 53
            return
        end local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/sun/javafx/scene/traversal/TopMostTraversalEngine;

  void <init>(com.sun.javafx.scene.traversal.Algorithm);
    descriptor: (Lcom/sun/javafx/scene/traversal/Algorithm;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
        start local 1 // com.sun.javafx.scene.traversal.Algorithm algorithm
         0: .line 59
            aload 0 /* this */
            aload 1 /* algorithm */
            invokespecial com.sun.javafx.scene.traversal.TraversalEngine.<init>:(Lcom/sun/javafx/scene/traversal/Algorithm;)V
         1: .line 60
            return
        end local 1 // com.sun.javafx.scene.traversal.Algorithm algorithm
        end local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lcom/sun/javafx/scene/traversal/TopMostTraversalEngine;
            0    2     1  algorithm  Lcom/sun/javafx/scene/traversal/Algorithm;
    MethodParameters:
           Name  Flags
      algorithm  

  public final javafx.scene.Node trav(javafx.scene.Node, com.sun.javafx.scene.traversal.Direction);
    descriptor: (Ljavafx/scene/Node;Lcom/sun/javafx/scene/traversal/Direction;)Ljavafx/scene/Node;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=3, locals=7, args_size=3
        start local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
        start local 1 // javafx.scene.Node node
        start local 2 // com.sun.javafx.scene.traversal.Direction dir
         0: .line 70
            aconst_null
            astore 3 /* newNode */
        start local 3 // javafx.scene.Node newNode
         1: .line 71
            aload 1 /* node */
            invokevirtual javafx.scene.Node.getParent:()Ljavafx/scene/Parent;
            astore 4 /* p */
        start local 4 // javafx.scene.Parent p
         2: .line 72
            aload 1 /* node */
            astore 5 /* traverseNode */
        start local 5 // javafx.scene.Node traverseNode
         3: .line 73
            goto 13
         4: .line 75
      StackMap locals: javafx.scene.Node javafx.scene.Parent javafx.scene.Node
      StackMap stack:
            aload 4 /* p */
            invokestatic com.sun.javafx.scene.ParentHelper.getTraversalEngine:(Ljavafx/scene/Parent;)Lcom/sun/javafx/scene/traversal/ParentTraversalEngine;
            astore 6 /* engine */
        start local 6 // com.sun.javafx.scene.traversal.ParentTraversalEngine engine
         5: .line 76
            aload 6 /* engine */
            ifnull 12
            aload 6 /* engine */
            invokevirtual com.sun.javafx.scene.traversal.ParentTraversalEngine.canTraverse:()Z
            ifeq 12
         6: .line 77
            aload 6 /* engine */
            aload 1 /* node */
            aload 2 /* dir */
            invokevirtual com.sun.javafx.scene.traversal.ParentTraversalEngine.select:(Ljavafx/scene/Node;Lcom/sun/javafx/scene/traversal/Direction;)Ljavafx/scene/Node;
            astore 3 /* newNode */
         7: .line 78
            aload 3 /* newNode */
            ifnull 9
         8: .line 79
            goto 14
         9: .line 84
      StackMap locals: com.sun.javafx.scene.traversal.ParentTraversalEngine
      StackMap stack:
            aload 4 /* p */
            astore 5 /* traverseNode */
        10: .line 85
            aload 2 /* dir */
            getstatic com.sun.javafx.scene.traversal.Direction.NEXT:Lcom/sun/javafx/scene/traversal/Direction;
            if_acmpne 12
        11: .line 86
            getstatic com.sun.javafx.scene.traversal.Direction.NEXT_IN_LINE:Lcom/sun/javafx/scene/traversal/Direction;
            astore 2 /* dir */
        12: .line 90
      StackMap locals:
      StackMap stack:
            aload 4 /* p */
            invokevirtual javafx.scene.Parent.getParent:()Ljavafx/scene/Parent;
            astore 4 /* p */
        end local 6 // com.sun.javafx.scene.traversal.ParentTraversalEngine engine
        13: .line 73
      StackMap locals:
      StackMap stack:
            aload 4 /* p */
            ifnonnull 4
        14: .line 93
      StackMap locals:
      StackMap stack:
            aload 3 /* newNode */
            ifnonnull 16
        15: .line 94
            aload 0 /* this */
            aload 5 /* traverseNode */
            aload 2 /* dir */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.select:(Ljavafx/scene/Node;Lcom/sun/javafx/scene/traversal/Direction;)Ljavafx/scene/Node;
            astore 3 /* newNode */
        16: .line 96
      StackMap locals:
      StackMap stack:
            aload 3 /* newNode */
            ifnonnull 22
        17: .line 97
            aload 2 /* dir */
            getstatic com.sun.javafx.scene.traversal.Direction.NEXT:Lcom/sun/javafx/scene/traversal/Direction;
            if_acmpeq 18
            aload 2 /* dir */
            getstatic com.sun.javafx.scene.traversal.Direction.NEXT_IN_LINE:Lcom/sun/javafx/scene/traversal/Direction;
            if_acmpne 20
        18: .line 98
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.selectFirst:()Ljavafx/scene/Node;
            astore 3 /* newNode */
        19: .line 99
            goto 22
      StackMap locals:
      StackMap stack:
        20: aload 2 /* dir */
            getstatic com.sun.javafx.scene.traversal.Direction.PREVIOUS:Lcom/sun/javafx/scene/traversal/Direction;
            if_acmpne 22
        21: .line 100
            aload 0 /* this */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.selectLast:()Ljavafx/scene/Node;
            astore 3 /* newNode */
        22: .line 103
      StackMap locals:
      StackMap stack:
            aload 3 /* newNode */
            ifnull 24
        23: .line 104
            aload 0 /* this */
            aload 3 /* newNode */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.focusAndNotify:(Ljavafx/scene/Node;)V
        24: .line 106
      StackMap locals:
      StackMap stack:
            aload 3 /* newNode */
            areturn
        end local 5 // javafx.scene.Node traverseNode
        end local 4 // javafx.scene.Parent p
        end local 3 // javafx.scene.Node newNode
        end local 2 // com.sun.javafx.scene.traversal.Direction dir
        end local 1 // javafx.scene.Node node
        end local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0   25     0          this  Lcom/sun/javafx/scene/traversal/TopMostTraversalEngine;
            0   25     1          node  Ljavafx/scene/Node;
            0   25     2           dir  Lcom/sun/javafx/scene/traversal/Direction;
            1   25     3       newNode  Ljavafx/scene/Node;
            2   25     4             p  Ljavafx/scene/Parent;
            3   25     5  traverseNode  Ljavafx/scene/Node;
            5   13     6        engine  Lcom/sun/javafx/scene/traversal/ParentTraversalEngine;
    MethodParameters:
      Name  Flags
      node  
      dir   

  private void focusAndNotify(javafx.scene.Node);
    descriptor: (Ljavafx/scene/Node;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
        start local 1 // javafx.scene.Node newNode
         0: .line 110
            aload 1 /* newNode */
            invokevirtual javafx.scene.Node.requestFocus:()V
         1: .line 111
            aload 0 /* this */
            aload 1 /* newNode */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.notifyTreeTraversedTo:(Ljavafx/scene/Node;)V
         2: .line 112
            return
        end local 1 // javafx.scene.Node newNode
        end local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lcom/sun/javafx/scene/traversal/TopMostTraversalEngine;
            0    3     1  newNode  Ljavafx/scene/Node;
    MethodParameters:
         Name  Flags
      newNode  

  private void notifyTreeTraversedTo(javafx.scene.Node);
    descriptor: (Ljavafx/scene/Node;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=4, args_size=2
        start local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
        start local 1 // javafx.scene.Node newNode
         0: .line 115
            aload 1 /* newNode */
            invokevirtual javafx.scene.Node.getParent:()Ljavafx/scene/Parent;
            astore 2 /* p */
        start local 2 // javafx.scene.Parent p
         1: .line 116
            goto 6
         2: .line 117
      StackMap locals: javafx.scene.Parent
      StackMap stack:
            aload 2 /* p */
            invokestatic com.sun.javafx.scene.ParentHelper.getTraversalEngine:(Ljavafx/scene/Parent;)Lcom/sun/javafx/scene/traversal/ParentTraversalEngine;
            astore 3 /* traversalEngine */
        start local 3 // com.sun.javafx.scene.traversal.ParentTraversalEngine traversalEngine
         3: .line 118
            aload 3 /* traversalEngine */
            ifnull 5
         4: .line 119
            aload 3 /* traversalEngine */
            aload 1 /* newNode */
            invokevirtual com.sun.javafx.scene.traversal.ParentTraversalEngine.notifyTraversedTo:(Ljavafx/scene/Node;)V
         5: .line 121
      StackMap locals: com.sun.javafx.scene.traversal.ParentTraversalEngine
      StackMap stack:
            aload 2 /* p */
            invokevirtual javafx.scene.Parent.getParent:()Ljavafx/scene/Parent;
            astore 2 /* p */
        end local 3 // com.sun.javafx.scene.traversal.ParentTraversalEngine traversalEngine
         6: .line 116
      StackMap locals:
      StackMap stack:
            aload 2 /* p */
            ifnonnull 2
         7: .line 123
            aload 0 /* this */
            aload 1 /* newNode */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.notifyTraversedTo:(Ljavafx/scene/Node;)V
         8: .line 124
            return
        end local 2 // javafx.scene.Parent p
        end local 1 // javafx.scene.Node newNode
        end local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    9     0             this  Lcom/sun/javafx/scene/traversal/TopMostTraversalEngine;
            0    9     1          newNode  Ljavafx/scene/Node;
            1    9     2                p  Ljavafx/scene/Parent;
            3    6     3  traversalEngine  Lcom/sun/javafx/scene/traversal/ParentTraversalEngine;
    MethodParameters:
         Name  Flags
      newNode  

  public final javafx.scene.Node traverseToFirst();
    descriptor: ()Ljavafx/scene/Node;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
         0: .line 131
            aload 0 /* this */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.selectFirst:()Ljavafx/scene/Node;
            astore 1 /* n */
        start local 1 // javafx.scene.Node n
         1: .line 132
            aload 1 /* n */
            ifnull 2
            aload 0 /* this */
            aload 1 /* n */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.focusAndNotify:(Ljavafx/scene/Node;)V
         2: .line 133
      StackMap locals: javafx.scene.Node
      StackMap stack:
            aload 1 /* n */
            areturn
        end local 1 // javafx.scene.Node n
        end local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/sun/javafx/scene/traversal/TopMostTraversalEngine;
            1    3     1     n  Ljavafx/scene/Node;

  public final javafx.scene.Node traverseToLast();
    descriptor: ()Ljavafx/scene/Node;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
         0: .line 141
            aload 0 /* this */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.selectLast:()Ljavafx/scene/Node;
            astore 1 /* n */
        start local 1 // javafx.scene.Node n
         1: .line 142
            aload 1 /* n */
            ifnull 2
            aload 0 /* this */
            aload 1 /* n */
            invokevirtual com.sun.javafx.scene.traversal.TopMostTraversalEngine.focusAndNotify:(Ljavafx/scene/Node;)V
         2: .line 143
      StackMap locals: javafx.scene.Node
      StackMap stack:
            aload 1 /* n */
            areturn
        end local 1 // javafx.scene.Node n
        end local 0 // com.sun.javafx.scene.traversal.TopMostTraversalEngine this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/sun/javafx/scene/traversal/TopMostTraversalEngine;
            1    3     1     n  Ljavafx/scene/Node;
}
SourceFile: "TopMostTraversalEngine.java"