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java.lang.Object net.sf.saxon.trace.TraceEventMulticaster
public class TraceEventMulticaster
A class which implements efficient and thread-safe multi-cast event dispatching for the TraceListener evants.
Field Summary | |
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protected EventListener |
a
|
protected EventListener |
b
|
Constructor Summary | |
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protected |
TraceEventMulticaster(EventListener a,
EventListener b)
Creates an event multicaster instance which chains listener-a with listener-b. |
Method Summary | |
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static TraceListener |
add(TraceListener a,
TraceListener b)
Adds trace-listener-a with trace-listener-b and returns the resulting multicast listener. |
protected static EventListener |
addInternal(EventListener a,
EventListener b)
Returns the resulting multicast listener from adding listener-a and listener-b together. |
void |
close()
Called at end |
void |
endCurrentItem(Item item)
Called when an item ceases to be the current item |
void |
enter(InstructionInfo element,
XPathContext context)
Called when an element of the stylesheet gets processed |
void |
leave(InstructionInfo element)
Called after an element of the stylesheet got processed |
void |
open(Controller controller)
Called at start |
protected EventListener |
remove(EventListener oldl)
Removes a listener from this multicaster and returns the resulting multicast listener. |
static TraceListener |
remove(TraceListener l,
TraceListener oldl)
Removes the old trace-listener from trace-listener-l and returns the resulting multicast listener. |
protected static EventListener |
removeInternal(EventListener l,
EventListener oldl)
Returns the resulting multicast listener after removing the old listener from listener-l. |
void |
setOutputDestination(PrintStream stream)
Method called to supply the destination for output |
void |
startCurrentItem(Item item)
Called when an item becomes current |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected final EventListener a
protected final EventListener b
Constructor Detail |
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protected TraceEventMulticaster(EventListener a, EventListener b)
a
- listener-ab
- listener-bMethod Detail |
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public void setOutputDestination(PrintStream stream)
TraceListener
setOutputDestination
in interface TraceListener
stream
- a PrintStream to which any output produced by the TraceListener should be writtenprotected EventListener remove(EventListener oldl)
oldl
- the listener to be removedpublic void open(Controller controller)
open
in interface TraceListener
controller
- identifies the transformation controller, and provides the listener with
access to context and configuration informationpublic void close()
close
in interface TraceListener
public void enter(InstructionInfo element, XPathContext context)
enter
in interface TraceListener
element
- 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.public void leave(InstructionInfo element)
leave
in interface TraceListener
element
- 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.public void startCurrentItem(Item item)
startCurrentItem
in interface TraceListener
item
- the new current item. Item objects are not mutable; it is safe to retain
a reference to the Item for later use.public void endCurrentItem(Item item)
endCurrentItem
in interface TraceListener
item
- 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.public static TraceListener add(TraceListener a, TraceListener b)
a
- trace-listener-ab
- trace-listener-bpublic static TraceListener remove(TraceListener l, TraceListener oldl)
l
- trace-listener-loldl
- the trace-listener being removedprotected static EventListener addInternal(EventListener a, EventListener b)
a
- event listener-ab
- event listener-bprotected static EventListener removeInternal(EventListener l, EventListener oldl)
l
- the listener being removed fromoldl
- the listener being removed
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