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 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 Details

    • traceLevel

      protected int traceLevel

  • Constructor Details

    • TraceCodeInjector

      public TraceCodeInjector()

  • Method Details

    • setTraceLevel

      public void setTraceLevel(int traceLevel)

    • levelValue

      public static int levelValue(String level)

    • 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.