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org.apache.xpath
Class XPathVisitor  

java.lang.Object
  org.apache.xpath.XPathVisitor

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public class XPathVisitor

extends java.lang.Object

A derivation from this class can be passed to a class that implements the XPathVisitable interface, to have the appropriate method called for each component of the XPath. Aside from possible other uses, the main intention is to provide a reasonable means to perform expression rewriting.

Each method has the form boolean visitComponentType(ExpressionOwner owner, ComponentType compType). The ExpressionOwner argument is the owner of the component, and can be used to reset the expression for rewriting. If a method returns false, the sub hierarchy will not be traversed.

This class is meant to be a base class that will be derived by concrete classes, and doesn't much except return true for each method.

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Constructor Summary

XPathVisitor()

 

Method Summary
boolean	visitBinaryOperation(ExpressionOwner owner, org.apache.xpath.operations.Operation op)           Visit a binary operation.
boolean	visitFunction(ExpressionOwner owner, org.apache.xpath.functions.Function func)           Visit a function.
boolean	visitLocationPath(ExpressionOwner owner, org.apache.xpath.axes.LocPathIterator path)           Visit a LocationPath.
boolean	visitMatchPattern(ExpressionOwner owner, org.apache.xpath.patterns.StepPattern pattern)           Visit a match pattern.
boolean	visitNumberLiteral(ExpressionOwner owner, org.apache.xpath.objects.XNumber num)           Visit a number literal.
boolean	visitPredicate(ExpressionOwner owner, Expression pred)           Visit a predicate within a location path.
boolean	visitStep(ExpressionOwner owner, org.apache.xpath.patterns.NodeTest step)           Visit a step within a location path.
boolean	visitStringLiteral(ExpressionOwner owner, org.apache.xpath.objects.XString str)           Visit a string literal.
boolean	visitUnaryOperation(ExpressionOwner owner, org.apache.xpath.operations.UnaryOperation op)           Visit a unary operation.
boolean	visitUnionPath(ExpressionOwner owner, org.apache.xpath.axes.UnionPathIterator path)           Visit a UnionPath.
boolean	visitUnionPattern(ExpressionOwner owner, org.apache.xpath.patterns.UnionPattern pattern)           Visit a union pattern.
boolean	visitVariableRef(ExpressionOwner owner, org.apache.xpath.operations.Variable var)           Visit a variable reference.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

XPathVisitor

public XPathVisitor()

Method Detail

visitLocationPath

public boolean visitLocationPath(ExpressionOwner owner,
                                 org.apache.xpath.axes.LocPathIterator path)

Visit a LocationPath.

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visitUnionPath

public boolean visitUnionPath(ExpressionOwner owner,
                              org.apache.xpath.axes.UnionPathIterator path)

Visit a UnionPath.

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visitStep

public boolean visitStep(ExpressionOwner owner,
                         org.apache.xpath.patterns.NodeTest step)

Visit a step within a location path.

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visitPredicate

public boolean visitPredicate(ExpressionOwner owner,
                              Expression pred)

Visit a predicate within a location path. Note that there isn't a proper unique component for predicates, and that the expression will be called also for whatever type Expression is.

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visitBinaryOperation

public boolean visitBinaryOperation(ExpressionOwner owner,
                                    org.apache.xpath.operations.Operation op)

Visit a binary operation.

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visitUnaryOperation

public boolean visitUnaryOperation(ExpressionOwner owner,
                                   org.apache.xpath.operations.UnaryOperation op)

Visit a unary operation.

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visitVariableRef

public boolean visitVariableRef(ExpressionOwner owner,
                                org.apache.xpath.operations.Variable var)

Visit a variable reference.

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visitFunction

public boolean visitFunction(ExpressionOwner owner,
                             org.apache.xpath.functions.Function func)

Visit a function.

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visitMatchPattern

public boolean visitMatchPattern(ExpressionOwner owner,
                                 org.apache.xpath.patterns.StepPattern pattern)

Visit a match pattern.

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visitUnionPattern

public boolean visitUnionPattern(ExpressionOwner owner,
                                 org.apache.xpath.patterns.UnionPattern pattern)

Visit a union pattern.

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visitStringLiteral

public boolean visitStringLiteral(ExpressionOwner owner,
                                  org.apache.xpath.objects.XString str)

Visit a string literal.

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visitNumberLiteral

public boolean visitNumberLiteral(ExpressionOwner owner,
                                  org.apache.xpath.objects.XNumber num)

Visit a number literal.

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