Package net.sf.saxon.trace

Class TraceCodeInjector

java.lang.Object

net.sf.saxon.trace.TraceCodeInjector

All Implemented Interfaces:

CodeInjector

Direct Known Subclasses:

TimingCodeInjector, XQueryTraceCodeInjector, XSLTTraceCodeInjector

public class TraceCodeInjector
extends java.lang.Object
implements CodeInjector

A code injector that wraps every expression (other than a literal) in a TraceExpression, which causes a TraceListener to be notified when the expression is evaluated

Field Summary

Fields

Modifier and Type	Field	Description
protected int	traceLevel

Constructor Summary

Constructors

Constructor	Description
TraceCodeInjector()

Method Summary

Modifier and Type	Method	Description
Expression	inject(Expression exp)	Process an expression.
Clause	injectClause(FLWORExpression expression, Clause clause)	Insert a tracing or monitoring clause into the pipeline of clauses that evaluates a FLWOR expression
protected boolean	isApplicable(Expression exp)
void	process(TraceableComponent component)	Process a component such as a function, template, or global variable.
void	setTraceLevel(int traceLevel)

Methods inherited from class java.lang.Object

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

Field Detail

traceLevel

protected int traceLevel

Constructor Detail

TraceCodeInjector

public TraceCodeInjector()

Method Detail

setTraceLevel

public void setTraceLevel(int traceLevel)

inject

public Expression inject(Expression exp)

Description copied from interface: CodeInjector

Process an expression.

Specified by:

inject in interface CodeInjector

Parameters:

exp - the expression to be processed

Returns:

a new expression. Possibly the original expression unchanged; possibly a wrapper expression (such as a TraceExpression; possibly a modified version of the original expression. The default implementation returns the supplied expression unchanged.

isApplicable

protected boolean isApplicable(Expression exp)

process

public void process(TraceableComponent component)

Description copied from interface: CodeInjector

Process a component such as a function, template, or global variable. The default implementation does nothing.

Specified by:

process in interface CodeInjector

Parameters:

component - the component to be processed

injectClause

public Clause injectClause(FLWORExpression expression,
                           Clause clause)

Insert a tracing or monitoring clause into the pipeline of clauses that evaluates a FLWOR expression

Specified by:

injectClause in interface CodeInjector

Parameters:

expression - the containing FLWOR expression

clause - the clause whose execution is being monitored

Returns:

an injected clause; or the original. The default implementation returns the original clause unchanged.