net.sf.saxon.expr.parser

Class ExpressionVisitor

java.lang.Object

net.sf.saxon.expr.parser.ExpressionVisitor

public class ExpressionVisitor
extends java.lang.Object

The ExpressionVisitor supports the various phases of processing of an expression tree which require a recursive walk of the tree structure visiting each node in turn. In maintains a stack holding the ancestor nodes of the node currently being visited.

Constructor Summary

Constructors

Constructor and Description
ExpressionVisitor(Configuration config) Create an ExpressionVisitor

Method Summary

Modifier and Type	Method and Description
void	decrementDepth() Decrement depth
Configuration	getConfiguration() Get the Configuration
StaticContext	getStaticContext() Get the static context for the expressions being visited.
java.lang.String	getTargetEdition() Get the target edition for which we are optimizing
boolean	incrementAndTestDepth() Increment and test depth
boolean	isOptimizeForPatternMatching() Ask whether the visitor is to optimize expressions for pattern matching
boolean	isOptimizeForStreaming() Ask whether the visitor is to optimize expressions for evaluation in a streaming environment
void	issueWarning(java.lang.String message, Location locator) Issue a warning message
static ExpressionVisitor	make(StaticContext env) Factory method: make an expression visitor
XPathContext	makeDynamicContext() Create a dynamic context suitable for early evaluation of constant subexpressions
void	setOptimizeForPatternMatching(boolean option) Tell the visitor to optimize expressions for pattern matching
void	setOptimizeForStreaming(boolean option) Tell the visitor to optimize expressions for evaluation in a streaming environment
void	setStaticContext(StaticContext staticContext) Set the static context for the expressions being visited.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionVisitor

public ExpressionVisitor(Configuration config)

Create an ExpressionVisitor

Parameters:

config - the Saxon configuration

Method Detail

getConfiguration

public Configuration getConfiguration()

Get the Configuration

Returns:

the configuration

getStaticContext

public StaticContext getStaticContext()

Get the static context for the expressions being visited. Note: this may not reflect all changes in static context (e.g. namespace context, base URI) applying to nested expressions

Returns:

the static context

setStaticContext

public void setStaticContext(StaticContext staticContext)

Set the static context for the expressions being visited. Note: this may not reflect all changes in static context (e.g. namespace context, base URI) applying to nested expressions

Parameters:

staticContext - the static context

make

public static ExpressionVisitor make(StaticContext env)

Factory method: make an expression visitor

Parameters:

env - the static context

Returns:

the new expression visitor

issueWarning

public void issueWarning(java.lang.String message,
                         Location locator)

Issue a warning message

Parameters:

message - the message

locator - the query/stylesheet location associated with the message

makeDynamicContext

public XPathContext makeDynamicContext()

Create a dynamic context suitable for early evaluation of constant subexpressions

Returns:

a dynamic evaluation context

setOptimizeForStreaming

public void setOptimizeForStreaming(boolean option)

Tell the visitor to optimize expressions for evaluation in a streaming environment

Parameters:

option - true if optimizing for streaming

isOptimizeForStreaming

public boolean isOptimizeForStreaming()

Ask whether the visitor is to optimize expressions for evaluation in a streaming environment

Returns:

true if optimizing for streaming

setOptimizeForPatternMatching

public void setOptimizeForPatternMatching(boolean option)

Tell the visitor to optimize expressions for pattern matching

Parameters:

option - true if optimizing for pattern matching

isOptimizeForPatternMatching

public boolean isOptimizeForPatternMatching()

Ask whether the visitor is to optimize expressions for pattern matching

Returns:

true if optimizing for pattern matching

getTargetEdition

public java.lang.String getTargetEdition()

Get the target edition for which we are optimizing

incrementAndTestDepth

public boolean incrementAndTestDepth()

Increment and test depth

Returns:

true if the current depth is less than a maximum limit; and increment the current depth

decrementDepth

public void decrementDepth()

Decrement depth