CodeInjector (saxon JavaDoc)

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

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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