net.sf.saxon.expr.parser

Interface CodeInjector

All Known Implementing Classes:

TimingCodeInjector, TraceCodeInjector, XSLTTraceCodeInjector

public interface CodeInjector

A code injector can be used to add code to the expression tree (for example, diagnostic tracing code) during the process of parsing and tree construction

Method Summary

Modifier and Type	Method and Description
Expression	inject(Expression exp, StaticContext env, int construct, StructuredQName qName) Wrap an expression in a diagnostic expression.
Clause	injectClause(Clause target, StaticContext env) Insert a tracing clause into the pipeline of clauses that evaluates a FLWOR expression

Method Detail

inject

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

Wrap an expression in a diagnostic expression.

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:

a replacement for the original expression (or the original expression unchanged). Normally the new expression will collect or output some diagnostic information and then invoke the original expression. However this is not required; the new expression could be a complete replacement for the original.

injectClause

Clause injectClause(Clause target,
                    StaticContext env)

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

Parameters:

target - the clause whose execution is being traced

env - the static context of the containing FLWOR expression