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public interface TraceListener
This interface defines methods that are called by Saxon during the execution of a stylesheet, if tracing is switched on. Tracing can be switched on by nominating an implementation of this class using the TRACE_LISTENER feature of the TransformerFactory, or using the addTraceListener() method of the Controller, which is Saxon's implementation of tyhe JAXP javax.xml.transform.Transformer interface.
Method Summary | |
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void |
close()
Method called at the end of execution, that is, when the run-time execution ends |
void |
endCurrentItem(Item currentItem)
Method that is called when an instruction has finished processing a new current item and is ready to select a new current item or revert to the previous current item. |
void |
enter(InstructionInfo instruction,
XPathContext context)
Method that is called when an instruction in the stylesheet gets processed. |
void |
leave(InstructionInfo instruction)
Method that is called after processing an instruction of the stylesheet, that is, after any child instructions have been processed. |
void |
open(Controller controller)
Method called at the start of execution, that is, when the run-time transformation starts |
void |
setOutputDestination(PrintStream stream)
Method called to supply the destination for output |
void |
startCurrentItem(Item currentItem)
Method that is called by an instruction that changes the current item in the source document: that is, xsl:for-each, xsl:apply-templates, xsl:for-each-group. |
Method Detail |
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void setOutputDestination(PrintStream stream)
stream
- a PrintStream to which any output produced by the TraceListener should be writtenvoid open(Controller controller)
controller
- identifies the transformation controller, and provides the listener with
access to context and configuration informationvoid close()
void enter(InstructionInfo instruction, XPathContext context)
instruction
- gives information about the instruction being
executed, and about the context in which it is executed. This object is mutable,
so if information from the InstructionInfo is to be retained, it must be copied.void leave(InstructionInfo instruction)
instruction
- gives the same information that was supplied to the
enter method, though it is not necessarily the same object. Note that the
line number of the instruction is that of the start tag in the source stylesheet,
not the line number of the end tag.void startCurrentItem(Item currentItem)
currentItem
- the new current item. Item objects are not mutable; it is safe to retain
a reference to the Item for later use.void endCurrentItem(Item currentItem)
currentItem
- the item that was current, whose processing is now complete. This will represent
the same underlying item as the corresponding startCurrentItem() call, though it will
not necessarily be the same actual object.
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