Java Module jdk.compiler Package com.sun.source.util Class TreePathScanner<R,P>（JDK11）

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java.lang.Object
- com.sun.source.util.TreeScanner<R,P>
- - com.sun.source.util.TreePathScanner<R,P>

All Implemented Interfaces:

TreeVisitor<R,P>
```
public class TreePathScanner<R,P>
extends TreeScanner<R,P>
```
A TreeVisitor that visits all the child tree nodes, and provides support for maintaining a path for the parent nodes. To visit nodes of a particular type, just override the corresponding visitorXYZ method. Inside your method, call super.visitXYZ to visit descendant nodes.

API Note:

In order to initialize the "current path", the scan must be started by calling one of the scan methods.

Since:

1.6

Constructor Summary

Constructors
Constructor	Description
`TreePathScanner()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`TreePath`	`getCurrentPath()`	Returns the current path for the node, as built up by the currently active set of scan calls.
`R`	`scan(Tree tree, P p)`	Scans a single node.
`R`	`scan(TreePath path, P p)`	Scans a tree from a position identified by a TreePath.

Methods declared in class com.sun.source.util.TreeScanner
reduce, scan, visitAnnotatedType, visitAnnotation, visitArrayAccess, visitArrayType, visitAssert, visitAssignment, visitBinary, visitBlock, visitBreak, visitCase, visitCatch, visitClass, visitCompilationUnit, visitCompoundAssignment, visitConditionalExpression, visitContinue, visitDoWhileLoop, visitEmptyStatement, visitEnhancedForLoop, visitErroneous, visitExpressionStatement, visitForLoop, visitIdentifier, visitIf, visitImport, visitInstanceOf, visitIntersectionType, visitLabeledStatement, visitLambdaExpression, visitLiteral, visitMemberReference, visitMemberSelect, visitMethod, visitMethodInvocation, visitModifiers, visitNewArray, visitNewClass, visitOther, visitPackage, visitParameterizedType, visitParenthesized, visitPrimitiveType, visitReturn, visitSwitch, visitSynchronized, visitThrow, visitTry, visitTypeCast, visitTypeParameter, visitUnary, visitUnionType, visitVariable, visitWhileLoop, visitWildcard

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods declared in interface com.sun.source.tree.TreeVisitor
visitExports, visitModule, visitOpens, visitProvides, visitRequires, visitUses

- Constructor Detail
  - TreePathScanner
```
public TreePathScanner()
```
- Method Detail
  - scan
```
public R scan(TreePath path,
              P p)
```
    Scans a tree from a position identified by a TreePath.
    
    Parameters:
    
    path - the path identifying the node to be scanned
    
    p - a parameter value passed to visit methods
    
    Returns:
    
    the result value from the visit method
  - scan
```
public R scan(Tree tree,
              P p)
```
    Scans a single node. The current path is updated for the duration of the scan.
    
    Overrides:
    
    scan in class TreeScanner<R,P>
    
    API Note:
    
    This method should normally only be called by the scanner's visit methods, as part of an ongoing scan initiated by scan(TreePath, P). The one exception is that it may also be called to initiate a full scan of a CompilationUnitTree.
    
    Parameters:
    
    tree - the node to be scanned
    
    p - a parameter value passed to the visit method
    
    Returns:
    
    the result value from the visit method
  - getCurrentPath
```
public TreePath getCurrentPath()
```
    Returns the current path for the node, as built up by the currently active set of scan calls.
    
    Returns:
    
    the current path

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