net.sf.saxon.trace

Class TraceCodeInjector

java.lang.Object

net.sf.saxon.trace.TraceCodeInjector

All Implemented Interfaces:

CodeInjector

Direct Known Subclasses:

TimingCodeInjector, 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

Constructor Summary

Constructors

Constructor and Description
TraceCodeInjector()

Method Summary

Modifier and Type	Method and Description
Expression	inject(Expression exp, StaticContext env, int construct, StructuredQName qName) If tracing, wrap an expression in a trace instruction
Clause	injectClause(Clause target, StaticContext env) If tracing, add a clause to a FLWOR expression that can be used to monitor requests for tuples to be processed

Methods inherited from class java.lang.Object

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

Constructor Detail

TraceCodeInjector

public TraceCodeInjector()

Method Detail

inject

public Expression inject(Expression exp,
                         StaticContext env,
                         int construct,
                         StructuredQName qName)

If tracing, wrap an expression in a trace instruction

Specified by:

inject in interface CodeInjector

Parameters:

exp - the expression to be wrapped

env - the static context

construct - integer constant identifying the kind of construct

qName - the name of the construct (if applicable)

Returns:

the expression that does the tracing

injectClause

public Clause injectClause(Clause target,
                           StaticContext env)

If tracing, add a clause to a FLWOR expression that can be used to monitor requests for tuples to be processed

Specified by:

injectClause in interface CodeInjector

Parameters:

target - the clause whose evaluation is to be traced (or otherwise monitored)

env - the static context of the containing FLWOR expression

Returns:

the new clause to do the tracing; or null if no tracing is required at this point