DiagnosticClausePull

java.lang.Object
- net.sf.saxon.expr.flwor.TuplePull
- - net.sf.saxon.expr.flwor.DiagnosticClausePull

```
public class DiagnosticClausePull
extends TuplePull
```
Implements the trace clause in a FLWOR expression. This is a Saxon extension that displays the value of a user-specified expression as the tuple stream is evaluated

Constructor Summary

Constructors
Constructor Description

DiagnosticClausePull(TuplePull base, DiagnosticClause diagClause)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Close the tuple stream, indicating that although not all tuples have been read, no further tuples are required and resources can be released
`boolean`	`nextTuple(XPathContext context)`	Move on to the next tuple.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DiagnosticClausePull
```
public DiagnosticClausePull(TuplePull base,
                            DiagnosticClause diagClause)
```
- Method Detail
  - nextTuple
```
public boolean nextTuple(XPathContext context)
                  throws XPathException
```
    Move on to the next tuple. Before returning, this method must set all the variables corresponding to the "returned" tuple in the local stack frame associated with the context object
    
    Specified by:
    
    nextTuple in class TuplePull
    
    Parameters:
    
    context - the dynamic evaluation context
    
    Returns:
    
    true if another tuple has been generated; false if the tuple stream is exhausted. If the method returns false, the values of the local variables corresponding to this tuple stream are undefined.
    
    Throws:
    
    XPathException - if any error occurs
  - close
```
public void close()
```
    Close the tuple stream, indicating that although not all tuples have been read, no further tuples are required and resources can be released
    
    Overrides:
    
    close in class TuplePull