Package net.sf.saxon.trace
Class TraceEventMulticaster
- java.lang.Object
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- net.sf.saxon.trace.TraceEventMulticaster
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- All Implemented Interfaces:
java.util.EventListener
,TraceListener
public class TraceEventMulticaster extends java.lang.Object implements TraceListener
A class which implements efficient and thread-safe multi-cast event dispatching for the TraceListener evants. Grabbed from java.awt.AWTEventMulticaster
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Constructor Summary
Constructors Modifier Constructor Description protected
TraceEventMulticaster(java.util.EventListener a, java.util.EventListener b)
Creates an event multicaster instance which chains listener-a with listener-b.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static TraceListener
add(TraceListener a, TraceListener b)
Adds trace-listener-a with trace-listener-b and returns the resulting multicast listener.protected static java.util.EventListener
addInternal(java.util.EventListener a, java.util.EventListener b)
Returns the resulting multicast listener from adding listener-a and listener-b together.void
close()
Called at endvoid
endCurrentItem(Item item)
Called when an item ceases to be the current itemvoid
enter(InstructionInfo element, XPathContext context)
Called when an element of the stylesheet gets processedvoid
leave(InstructionInfo element)
Called after an element of the stylesheet got processedvoid
open()
Called at startprotected java.util.EventListener
remove(java.util.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 java.util.EventListener
removeInternal(java.util.EventListener l, java.util.EventListener oldl)
Returns the resulting multicast listener after removing the old listener from listener-l.void
startCurrentItem(Item item)
Called when an item becomes current
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Method Detail
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remove
protected java.util.EventListener remove(java.util.EventListener oldl)
Removes a listener from this multicaster and returns the resulting multicast listener.- Parameters:
oldl
- the listener to be removed
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open
public void open()
Called at start- Specified by:
open
in interfaceTraceListener
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close
public void close()
Called at end- Specified by:
close
in interfaceTraceListener
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enter
public void enter(InstructionInfo element, XPathContext context)
Called when an element of the stylesheet gets processed- Specified by:
enter
in interfaceTraceListener
- Parameters:
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.
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leave
public void leave(InstructionInfo element)
Called after an element of the stylesheet got processed- Specified by:
leave
in interfaceTraceListener
- Parameters:
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.
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startCurrentItem
public void startCurrentItem(Item item)
Called when an item becomes current- Specified by:
startCurrentItem
in interfaceTraceListener
- Parameters:
item
- the new current item. Item objects are not mutable; it is safe to retain a reference to the Item for later use.
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endCurrentItem
public void endCurrentItem(Item item)
Called when an item ceases to be the current item- Specified by:
endCurrentItem
in interfaceTraceListener
- Parameters:
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.
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add
public static TraceListener add(TraceListener a, TraceListener b)
Adds trace-listener-a with trace-listener-b and returns the resulting multicast listener.- Parameters:
a
- trace-listener-ab
- trace-listener-b
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remove
public static TraceListener remove(TraceListener l, TraceListener oldl)
Removes the old trace-listener from trace-listener-l and returns the resulting multicast listener.- Parameters:
l
- trace-listener-loldl
- the trace-listener being removed
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addInternal
protected static java.util.EventListener addInternal(java.util.EventListener a, java.util.EventListener b)
Returns the resulting multicast listener from adding listener-a and listener-b together. If listener-a is null, it returns listener-b; If listener-b is null, it returns listener-a If neither are null, then it creates and returns a new EventMulticaster instance which chains a with b.- Parameters:
a
- event listener-ab
- event listener-b
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removeInternal
protected static java.util.EventListener removeInternal(java.util.EventListener l, java.util.EventListener oldl)
Returns the resulting multicast listener after removing the old listener from listener-l. If listener-l equals the old listener OR listener-l is null, returns null. Else if listener-l is an instance of SaxonEventMulticaster, then it removes the old listener from it. Else, returns listener l.- Parameters:
l
- the listener being removed fromoldl
- the listener being removed
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