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Interface TreeVisitor<R,P>

Type Parameters:: R - the return type of this visitor's methods. Use Void for visitors that do not need to return results.; P - the type of the additional parameter to this visitor's methods. Use Void for visitors that do not need an additional parameter.

All Known Implementing Classes:: SimpleTreeVisitor, TreePathScanner, TreeScanner

public interface TreeVisitor<R,P>

A visitor of trees, in the style of the visitor design pattern. Classes implementing this interface are used to operate on a tree when the kind of tree is unknown at compile time. When a visitor is passed to a tree's accept method, the visitXyz method most applicable to that tree is invoked.

Classes implementing this interface may or may not throw a NullPointerException if the additional parameter p is null; see documentation of the implementing class for details.

WARNING: It is possible that methods will be added to this interface to accommodate new, currently unknown, language structures added to future versions of the Java programming language. Therefore, visitor classes directly implementing this interface may be source incompatible with future versions of the platform.

Since:: 1.6

Method Summary

Modifier and Type	Method	Description
`R`	`visitAnnotatedType(AnnotatedTypeTree node, P p)`	Visits an `AnnotatedTypeTree` node.
`R`	`visitAnnotation(AnnotationTree node, P p)`	Visits an `AnnotatedTree` node.
`R`	`visitAnyPattern(AnyPatternTree^PREVIEW node, P p)`	Preview. Visits a `AnyPatternTree` node.
`R`	`visitArrayAccess(ArrayAccessTree node, P p)`	Visits an `ArrayAccessTree` node.
`R`	`visitArrayType(ArrayTypeTree node, P p)`	Visits an `ArrayTypeTree` node.
`R`	`visitAssert(AssertTree node, P p)`	Visits an `AssertTree` node.
`R`	`visitAssignment(AssignmentTree node, P p)`	Visits an `AssignmentTree` node.
`R`	`visitBinary(BinaryTree node, P p)`	Visits a `BinaryTree` node.
`R`	`visitBindingPattern(BindingPatternTree node, P p)`	Visits a `BindingPatternTree` node.
`R`	`visitBlock(BlockTree node, P p)`	Visits a `BlockTree` node.
`R`	`visitBreak(BreakTree node, P p)`	Visits a `BreakTree` node.
`R`	`visitCase(CaseTree node, P p)`	Visits a `CaseTree` node.
`R`	`visitCatch(CatchTree node, P p)`	Visits a `CatchTree` node.
`R`	`visitClass(ClassTree node, P p)`	Visits a `ClassTree` node.
`R`	`visitCompilationUnit(CompilationUnitTree node, P p)`	Visits a `CompilationUnitTree` node.
`R`	`visitCompoundAssignment(CompoundAssignmentTree node, P p)`	Visits a `CompoundAssignmentTree` node.
`R`	`visitConditionalExpression(ConditionalExpressionTree node, P p)`	Visits a `ConditionalExpressionTree` node.
`R`	`visitConstantCaseLabel(ConstantCaseLabelTree node, P p)`	Visits a `ConstantCaseLabelTree` node.
`R`	`visitContinue(ContinueTree node, P p)`	Visits a `ContinueTree` node.
`R`	`visitDeconstructionPattern(DeconstructionPatternTree node, P p)`	Visits a `DeconstructionPatternTree` node.
`R`	`visitDefaultCaseLabel(DefaultCaseLabelTree node, P p)`	Visits a `DefaultCaseLabelTree` node.
`R`	`visitDoWhileLoop(DoWhileLoopTree node, P p)`	Visits a `DoWhileTree` node.
`R`	`visitEmptyStatement(EmptyStatementTree node, P p)`	Visits an `EmptyStatementTree` node.
`R`	`visitEnhancedForLoop(EnhancedForLoopTree node, P p)`	Visits an `EnhancedForLoopTree` node.
`R`	`visitErroneous(ErroneousTree node, P p)`	Visits an `ErroneousTree` node.
`R`	`visitExports(ExportsTree node, P p)`	Visits an `ExportsTree` node.
`R`	`visitExpressionStatement(ExpressionStatementTree node, P p)`	Visits an `ExpressionStatementTree` node.
`R`	`visitForLoop(ForLoopTree node, P p)`	Visits a `ForLoopTree` node.
`R`	`visitIdentifier(IdentifierTree node, P p)`	Visits an `IdentifierTree` node.
`R`	`visitIf(IfTree node, P p)`	Visits an `IfTree` node.
`R`	`visitImport(ImportTree node, P p)`	Visits an `ImportTree` node.
`R`	`visitInstanceOf(InstanceOfTree node, P p)`	Visits an `InstanceOfTree` node.
`R`	`visitIntersectionType(IntersectionTypeTree node, P p)`	Visits an `IntersectionTypeTree` node.
`R`	`visitLabeledStatement(LabeledStatementTree node, P p)`	Visits a `LabeledStatementTree` node.
`R`	`visitLambdaExpression(LambdaExpressionTree node, P p)`	Visits a `LambdaExpressionTree` node.
`R`	`visitLiteral(LiteralTree node, P p)`	Visits a `LiteralTree` node.
`R`	`visitMemberReference(MemberReferenceTree node, P p)`	Visits a `MemberReferenceTree` node.
`R`	`visitMemberSelect(MemberSelectTree node, P p)`	Visits a `MemberSelectTree` node.
`R`	`visitMethod(MethodTree node, P p)`	Visits a `MethodTree` node.
`R`	`visitMethodInvocation(MethodInvocationTree node, P p)`	Visits a `MethodInvocationTree` node.
`R`	`visitModifiers(ModifiersTree node, P p)`	Visits a `ModifiersTree` node.
`R`	`visitModule(ModuleTree node, P p)`	Visits a `ModuleTree` node.
`R`	`visitNewArray(NewArrayTree node, P p)`	Visits a `NewArrayTree` node.
`R`	`visitNewClass(NewClassTree node, P p)`	Visits a `NewClassTree` node.
`R`	`visitOpens(OpensTree node, P p)`	Visits an `OpensTree` node.
`R`	`visitOther(Tree node, P p)`	Visits an unknown type of `Tree` node.
`R`	`visitPackage(PackageTree node, P p)`	Visits a `PackageTree` node.
`R`	`visitParameterizedType(ParameterizedTypeTree node, P p)`	Visits a `ParameterizedTypeTree` node.
`R`	`visitParenthesized(ParenthesizedTree node, P p)`	Visits a `ParenthesizedTree` node.
`R`	`visitPatternCaseLabel(PatternCaseLabelTree node, P p)`	Visits a `PatternCaseLabelTree` node.
`R`	`visitPrimitiveType(PrimitiveTypeTree node, P p)`	Visits a `PrimitiveTypeTree` node.
`R`	`visitProvides(ProvidesTree node, P p)`	Visits a `ProvidesTree` node.
`R`	`visitRequires(RequiresTree node, P p)`	Visits a `RequiresTree` node.
`R`	`visitReturn(ReturnTree node, P p)`	Visits a `ReturnTree` node.
`R`	`visitStringTemplate(StringTemplateTree^PREVIEW node, P p)`	Preview. Visits a StringTemplateTree node.
`R`	`visitSwitch(SwitchTree node, P p)`	Visits a `SwitchTree` node.
`R`	`visitSwitchExpression(SwitchExpressionTree node, P p)`	Visits a `SwitchExpressionTree` node.
`R`	`visitSynchronized(SynchronizedTree node, P p)`	Visits a `SynchronizedTree` node.
`R`	`visitThrow(ThrowTree node, P p)`	Visits a `ThrowTree` node.
`R`	`visitTry(TryTree node, P p)`	Visits a `TryTree` node.
`R`	`visitTypeCast(TypeCastTree node, P p)`	Visits a `TypeCastTree` node.
`R`	`visitTypeParameter(TypeParameterTree node, P p)`	Visits a `TypeParameterTree` node.
`R`	`visitUnary(UnaryTree node, P p)`	Visits a `UnaryTree` node.
`R`	`visitUnionType(UnionTypeTree node, P p)`	Visits a `UnionTypeTree` node.
`R`	`visitUses(UsesTree node, P p)`	Visits a `UsesTree` node.
`R`	`visitVariable(VariableTree node, P p)`	Visits a `VariableTree` node.
`R`	`visitWhileLoop(WhileLoopTree node, P p)`	Visits a `WhileLoopTree` node.
`R`	`visitWildcard(WildcardTree node, P p)`	Visits a `WildcardTypeTree` node.
`R`	`visitYield(YieldTree node, P p)`	Visits a `YieldTree` node.

Method Details

visitAnnotatedType

R visitAnnotatedType(AnnotatedTypeTree node, P p)

Visits an AnnotatedTypeTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitAnnotation

R visitAnnotation(AnnotationTree node, P p)

Visits an AnnotatedTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitMethodInvocation

R visitMethodInvocation(MethodInvocationTree node, P p)

Visits a MethodInvocationTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitAssert

R visitAssert(AssertTree node, P p)

Visits an AssertTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitAssignment

R visitAssignment(AssignmentTree node, P p)

Visits an AssignmentTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitCompoundAssignment

R visitCompoundAssignment(CompoundAssignmentTree node, P p)

Visits a CompoundAssignmentTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitBinary

R visitBinary(BinaryTree node, P p)

Visits a BinaryTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitBlock

R visitBlock(BlockTree node, P p)

Visits a BlockTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitBreak

R visitBreak(BreakTree node, P p)

Visits a BreakTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitCase

R visitCase(CaseTree node, P p)

Visits a CaseTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitCatch

R visitCatch(CatchTree node, P p)

Visits a CatchTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitClass

R visitClass(ClassTree node, P p)

Visits a ClassTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitConditionalExpression

R visitConditionalExpression(ConditionalExpressionTree node, P p)

Visits a ConditionalExpressionTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitContinue

R visitContinue(ContinueTree node, P p)

Visits a ContinueTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitDoWhileLoop

R visitDoWhileLoop(DoWhileLoopTree node, P p)

Visits a DoWhileTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitErroneous

R visitErroneous(ErroneousTree node, P p)

Visits an ErroneousTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitExpressionStatement

R visitExpressionStatement(ExpressionStatementTree node, P p)

Visits an ExpressionStatementTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitEnhancedForLoop

R visitEnhancedForLoop(EnhancedForLoopTree node, P p)

Visits an EnhancedForLoopTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitForLoop

R visitForLoop(ForLoopTree node, P p)

Visits a ForLoopTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitIdentifier

R visitIdentifier(IdentifierTree node, P p)

Visits an IdentifierTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitIf

R visitIf(IfTree node, P p)

Visits an IfTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitImport

R visitImport(ImportTree node, P p)

Visits an ImportTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitArrayAccess

R visitArrayAccess(ArrayAccessTree node, P p)

Visits an ArrayAccessTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitLabeledStatement

R visitLabeledStatement(LabeledStatementTree node, P p)

Visits a LabeledStatementTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitLiteral

R visitLiteral(LiteralTree node, P p)

Visits a LiteralTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitStringTemplate

R visitStringTemplate(StringTemplateTreePREVIEW node, P p)

visitStringTemplate is a reflective preview API of the Java platform.

Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.

Visits a StringTemplateTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitAnyPattern

R visitAnyPattern(AnyPatternTreePREVIEW node, P p)

visitAnyPattern is a preview API of the Java platform.

Programs can only use visitAnyPattern when preview features are enabled.

Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.

Visits a AnyPatternTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value
Since:: 21

visitBindingPattern

R visitBindingPattern(BindingPatternTree node, P p)

Visits a BindingPatternTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value
Since:: 16

visitDefaultCaseLabel

R visitDefaultCaseLabel(DefaultCaseLabelTree node, P p)

Visits a DefaultCaseLabelTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value
Since:: 21

visitConstantCaseLabel

R visitConstantCaseLabel(ConstantCaseLabelTree node, P p)

Visits a ConstantCaseLabelTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value
Since:: 21

visitPatternCaseLabel

R visitPatternCaseLabel(PatternCaseLabelTree node, P p)

Visits a PatternCaseLabelTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value
Since:: 21

visitDeconstructionPattern

R visitDeconstructionPattern(DeconstructionPatternTree node, P p)

Visits a DeconstructionPatternTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value
Since:: 21

visitMethod

R visitMethod(MethodTree node, P p)

Visits a MethodTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitModifiers

R visitModifiers(ModifiersTree node, P p)

Visits a ModifiersTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitNewArray

R visitNewArray(NewArrayTree node, P p)

Visits a NewArrayTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitNewClass

R visitNewClass(NewClassTree node, P p)

Visits a NewClassTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitLambdaExpression

R visitLambdaExpression(LambdaExpressionTree node, P p)

Visits a LambdaExpressionTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitPackage

R visitPackage(PackageTree node, P p)

Visits a PackageTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitParenthesized

R visitParenthesized(ParenthesizedTree node, P p)

Visits a ParenthesizedTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitReturn

R visitReturn(ReturnTree node, P p)

Visits a ReturnTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitMemberSelect

R visitMemberSelect(MemberSelectTree node, P p)

Visits a MemberSelectTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitMemberReference

R visitMemberReference(MemberReferenceTree node, P p)

Visits a MemberReferenceTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitEmptyStatement

R visitEmptyStatement(EmptyStatementTree node, P p)

Visits an EmptyStatementTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitSwitch

R visitSwitch(SwitchTree node, P p)

Visits a SwitchTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitSwitchExpression

R visitSwitchExpression(SwitchExpressionTree node, P p)

Visits a SwitchExpressionTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value
Since:: 12

visitSynchronized

R visitSynchronized(SynchronizedTree node, P p)

Visits a SynchronizedTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitThrow

R visitThrow(ThrowTree node, P p)

Visits a ThrowTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitCompilationUnit

R visitCompilationUnit(CompilationUnitTree node, P p)

Visits a CompilationUnitTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitTry

R visitTry(TryTree node, P p)

Visits a TryTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitParameterizedType

R visitParameterizedType(ParameterizedTypeTree node, P p)

Visits a ParameterizedTypeTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitUnionType

R visitUnionType(UnionTypeTree node, P p)

Visits a UnionTypeTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitIntersectionType

R visitIntersectionType(IntersectionTypeTree node, P p)

Visits an IntersectionTypeTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitArrayType

R visitArrayType(ArrayTypeTree node, P p)

Visits an ArrayTypeTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitTypeCast

R visitTypeCast(TypeCastTree node, P p)

Visits a TypeCastTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitPrimitiveType

R visitPrimitiveType(PrimitiveTypeTree node, P p)

Visits a PrimitiveTypeTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitTypeParameter

R visitTypeParameter(TypeParameterTree node, P p)

Visits a TypeParameterTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitInstanceOf

R visitInstanceOf(InstanceOfTree node, P p)

Visits an InstanceOfTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitUnary

R visitUnary(UnaryTree node, P p)

Visits a UnaryTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitVariable

R visitVariable(VariableTree node, P p)

Visits a VariableTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitWhileLoop

R visitWhileLoop(WhileLoopTree node, P p)

Visits a WhileLoopTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitWildcard

R visitWildcard(WildcardTree node, P p)

Visits a WildcardTypeTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitModule

R visitModule(ModuleTree node, P p)

Visits a ModuleTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitExports

R visitExports(ExportsTree node, P p)

Visits an ExportsTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitOpens

R visitOpens(OpensTree node, P p)

Visits an OpensTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitProvides

R visitProvides(ProvidesTree node, P p)

Visits a ProvidesTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitRequires

R visitRequires(RequiresTree node, P p)

Visits a RequiresTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitUses

R visitUses(UsesTree node, P p)

Visits a UsesTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitOther

R visitOther(Tree node, P p)

Visits an unknown type of Tree node. This can occur if the language evolves and new kinds of nodes are added to the Tree hierarchy.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value

visitYield

R visitYield(YieldTree node, P p)

Visits a YieldTree node.

Parameters:: node - the node being visited; p - a parameter value
Returns:: a result value
Since:: 13

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Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/jdk.compiler/com/sun/source/tree/TreeVisitor.html