Package net.sf.saxon.expr.parser
Class ExpressionVisitor
- java.lang.Object
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- net.sf.saxon.expr.parser.ExpressionVisitor
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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.
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Constructor Summary
Constructors Constructor Description ExpressionVisitor(Configuration config)
Create an ExpressionVisitor
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
decrementDepth()
Decrement depthConfiguration
getConfiguration()
Get the ConfigurationStaticContext
getStaticContext()
Get the static context for the expressions being visited.java.lang.String
getTargetEdition()
Get the target environment for which we are optimizingboolean
incrementAndTestDepth()
Increment and test depthboolean
isOptimizeForPatternMatching()
Ask whether the visitor is to optimize expressions for evaluation as an XSLT match patternboolean
isOptimizeForStreaming()
Ask whether the visitor is to optimize expressions for evaluation in a streaming environmentvoid
issueWarning(java.lang.String message, Location locator)
Issue a warning messageboolean
isSuppressWarnings()
Ask if warnings have been suppressed.static ExpressionVisitor
make(StaticContext env)
Factory method: make an expression visitorXPathContext
makeDynamicContext()
Create a dynamic context suitable for early evaluation of constant subexpressionsOptimizer
obtainOptimizer()
Obtain an optimizer.void
setOptimizeForPatternMatching(boolean option)
Tell the visitor to optimize expressions for evaluation as an XSLT match patternvoid
setOptimizeForStreaming(boolean option)
Tell the visitor to optimize expressions for evaluation in a streaming environmentvoid
setStaticContext(StaticContext staticContext)
Set the static context for the expressions being visited.void
setSuppressWarnings(boolean suppressWarnings)
Say whether warnings should be suppressed.
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Constructor Detail
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ExpressionVisitor
public ExpressionVisitor(Configuration config)
Create an ExpressionVisitor- Parameters:
config
- the Saxon configuration
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Method Detail
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getConfiguration
public Configuration getConfiguration()
Get the Configuration- Returns:
- the configuration
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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
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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
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make
public static ExpressionVisitor make(StaticContext env)
Factory method: make an expression visitor- Parameters:
env
- the static context- Returns:
- the new expression visitor
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issueWarning
public void issueWarning(java.lang.String message, Location locator)
Issue a warning message- Parameters:
message
- the messagelocator
- the query/stylesheet location associated with the message
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makeDynamicContext
public XPathContext makeDynamicContext()
Create a dynamic context suitable for early evaluation of constant subexpressions- Returns:
- a dynamic evaluation context
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obtainOptimizer
public Optimizer obtainOptimizer()
Obtain an optimizer. The optimizer is created on the first call of this method and is retained for use in subsequent calls.- Returns:
- a suitable optimizer, taking into account the optimization options defined by the Configuration and by the static context
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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
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isOptimizeForStreaming
public boolean isOptimizeForStreaming()
Ask whether the visitor is to optimize expressions for evaluation in a streaming environment- Returns:
- true if optimizing for streaming
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setOptimizeForPatternMatching
public void setOptimizeForPatternMatching(boolean option)
Tell the visitor to optimize expressions for evaluation as an XSLT match pattern- Parameters:
option
- true if optimizing for pattern matching
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isOptimizeForPatternMatching
public boolean isOptimizeForPatternMatching()
Ask whether the visitor is to optimize expressions for evaluation as an XSLT match pattern- Returns:
- true if optimizing for pattern matching
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getTargetEdition
public java.lang.String getTargetEdition()
Get the target environment for which we are optimizing- Returns:
- the target environment (for example "EE" or "JS"). Defaults to the edition of the current configuration
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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
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decrementDepth
public void decrementDepth()
Decrement depth
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isSuppressWarnings
public boolean isSuppressWarnings()
Ask if warnings have been suppressed. This typically happens when processing code that has been copied, to prevent multiple warnings for the same code- Returns:
- true if warnings are suppressed
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setSuppressWarnings
public void setSuppressWarnings(boolean suppressWarnings)
Say whether warnings should be suppressed. This is typically done when processing code that has been copied, to prevent multiple warnings for the same code- Parameters:
suppressWarnings
- set to true to suppress warnings
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