com.icl.saxon.trace

Class SaxonEventMulticaster

public class SaxonEventMulticaster extends Object implements TraceListener

A class which implements efficient and thread-safe multi-cast event dispatching for the TraceListener evants. Grabbed from java.awt.AWTEventMulticaster

Field Summary
protected EventListener	a
protected EventListener	b

Constructor Summary
protected	SaxonEventMulticaster(EventListener a, EventListener b) Creates an event multicaster instance which chains listener-a with listener-b.

Method Summary
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	enter(NodeInfo element, Context context) Called when an element of the stylesheet gets processed
void	enterSource(NodeHandler handler, Context context) Called when a node of the source tree gets processed
void	leave(NodeInfo element, Context context) Called after an element of the stylesheet got processed
void	leaveSource(NodeHandler handler, Context context) Called after a node of the source tree got processed
void	open() 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	toplevel(NodeInfo element) Called for all top level elements

Field Detail

Constructor Detail

SaxonEventMulticaster

protected SaxonEventMulticaster(EventListener a, EventListener b)

Creates an event multicaster instance which chains listener-a with listener-b.

Parameters: a listener-a b listener-b

Method Detail

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-a b trace-listener-b

addInternal

protected static EventListener addInternal(EventListener a, 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-a b event listener-b

close

public void close()

Called at end

enter

public void enter(NodeInfo element, Context context)

Called when an element of the stylesheet gets processed

enterSource

public void enterSource(NodeHandler handler, Context context)

Called when a node of the source tree gets processed

leave

public void leave(NodeInfo element, Context context)

Called after an element of the stylesheet got processed

leaveSource

public void leaveSource(NodeHandler handler, Context context)

Called after a node of the source tree got processed

open

public void open()

Called at start

remove

protected EventListener remove(EventListener oldl)

Removes a listener from this multicaster and returns the resulting multicast listener.

Parameters: oldl the listener to be removed

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-l oldl the trace-listener being removed

removeInternal

protected static EventListener removeInternal(EventListener l, 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 from oldl the listener being removed

toplevel

public void toplevel(NodeInfo element)

Called for all top level elements