CodeInjector

All Known Implementing Classes:

TimingCodeInjector, TraceCodeInjector, XQueryTraceCodeInjector, 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 Default Methods
Modifier and Type	Method	Description
`default Expression`	`inject(Expression exp)`	Process an expression.
`default Clause`	`injectClause(FLWORExpression expression, Clause clause)`	Insert a tracing or monitoring clause into the pipeline of clauses that evaluates a FLWOR expression
`default void`	`process(TraceableComponent component)`	Process a component such as a function, template, or global variable.

- Method Detail
  - inject
```
default Expression inject(Expression exp)
```
    Process an expression.
    
    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.
  - process
```
default void process(TraceableComponent component)
```
    Process a component such as a function, template, or global variable. The default implementation does nothing.
    
    Parameters:
    
    component - the component to be processed
  - injectClause
```
default Clause injectClause(FLWORExpression expression,
                            Clause clause)
```
    Insert a tracing or monitoring clause into the pipeline of clauses that evaluates a FLWOR expression
    
    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.