[Bug java/21065] New: javax.swing.event.EventListenerList.getListenerList() implemented wrong
I am using a custom Class wich throws events, by using this I rely on the
EventListenerList Class to hold my Eventlisteners. The Method getListenerList is
used by the method
protected void fireFooXXX() {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==FooListener.class) {
// Lazily create the event:
if (fooEvent == null)
fooEvent = new FooEvent(this);
((FooListener)listeners[i+1]).fooXXX(fooEvent);
}
}
}
which is the standard Method given in the API to fire Events to all
EventListeners. This Method relies on the correct implementation of
getListenerList() which should according to the API Documentation of Java by SUN
http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/event/EventListenerList.html#getListenerList()
[quote]
getListenerList
public Object[] getListenerList()
Passes back the event listener list as an array of ListenerType-listener
pairs. Note that for performance reasons, this implementation passes back the
actual data structure in which the listener data is stored internally! This
method is guaranteed to pass back a non-null array, so that no null-checking is
required in fire methods. A zero-length array of Object should be returned if
there are currently no listeners. WARNING!!! Absolutely NO modification of the
data contained in this array should be made -- if any such manipulation is
necessary, it should be done on a copy of the array returned rather than the
array itself.
[/quote]
The API doc says "Passes back the event listener list as an array of
ListenerType-listener pairs." my understanding of pairs is multiples of two, so
the EventListenerList can never contain 1 or 3 entries or any other odd number.
But when adding one Eventlistener to such a list it really just adds this
EventListener resulting in a getListenerList() which returns one Element, which
is simply wrong.
A Testcase will follow as soon as I have written one.
btw this is my system: WinXP SP2
gcj 4.0 20050324 from thisiscool.com
Regards,
Andreas
--
Summary: javax.swing.event.EventListenerList.getListenerList()
implemented wrong
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: critical
Priority: P1
Component: java
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gruni dot ca at gmail dot com
CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21065
[Bug java/21065] javax.swing.event.EventListenerList.getListenerList() implemented wrong
--- Additional Comments From gruni dot ca at gmail dot com 2005-04-17 00:45 --- Created an attachment (id=8663) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8663&action=view) Simple Testcase showing that addind a EventListener increments the list by one This is a testcase I wrote, I compiled it with gcj --main=GcjEventListenerListTest -o EventTest.exe GcjEventListenerListTest.java the output should be similar to JDK if implemented correctly JDK output: should be=2 is=2 should be=4 is=4 GCJ output: should be=2 is=1 should be=4 is=2 That's all I have -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21065
[Bug java/21065] javax.swing.event.EventListenerList.getListenerList() implemented wrong
-- What|Removed |Added Attachment #8663|Simple Testcase showing that|Simple Testcase showing that description|addind a EventListener |adding a EventListener |increments the list by one |increments the list by one http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21065
[Bug java/21068] New: String(strBytes, "UTF-16LE"); thorws java.io.UnsupportedEncodingException
The constructor String(strBytes, "UTF-16LE"); throws a
UnsupportedEncodingException which is not logical, becasue the Charset is
supported according to Charset.availableCharsets()
TestCase will follow. This is my output
Available Charsets are:
{ISO-8859-1=ISO-8859-1, US-ASCII=US-ASCII, UTF-16=UTF-16, UTF-16BE=UTF-16BE,
UTF-16LE=UTF-16LE, UTF-8=UTF-8}
Exception in thread "main" java.io.UnsupportedEncodingException: UTF-16LE
(java.lang.ClassNotFoundException: gnu.gcj.con
vert.Input_UnicodeLittle not found in
gnu.gcj.runtime.SystemClassLoader{urls=[file:.\],
parent=gnu.gcj.runtime.VMClassLo
ader{urls=[core:/], parent=null}})
at GcjStringTest.main(java.lang.String[])
(E:\2004-development\2005-extraextra\src\GcjStringTest.java)
at ._main (C:\DOKUME~1\GRUNEW~1\LOKALE~1\Temp\ccM5baaa.i)
And accoring to the APIdocs:
String
public String(byte[] bytes,
String charsetName)
throws UnsupportedEncodingException
Constructs a new String by decoding the specified array of bytes using the
specified charset. The length of the new String is a function of the charset,
and hence may not be equal to the length of the byte array.
The behavior of this constructor when the given bytes are not valid in the
given charset is unspecified. The CharsetDecoder class should be used when more
control over the decoding process is required.
Parameters:
bytes - the bytes to be decoded into characters
charsetName - the name of a supported charset
Throws:
UnsupportedEncodingException - If the named charset is not supported
Since:
JDK1.1
The charset should be taken out of the Charsets class.
So ya this is a bug in my eyes.
Regards,
Andreas
--
Summary: String(strBytes, "UTF-16LE"); thorws
java.io.UnsupportedEncodingException
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: java
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gruni dot ca at gmail dot com
CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21068
[Bug java/21068] String(strBytes, "UTF-16LE"); thorws java.io.UnsupportedEncodingException
--- Additional Comments From gruni dot ca at gmail dot com 2005-04-17 12:43 --- Created an attachment (id=8665) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8665&action=view) Tests the String(strBytes, "UTF-16LE"); which shouldn't return an Exception This is the testcase which runs without Exception in JDK but throws the UnsupportedEncodingException when compiled with GCJ. My system was WinXP with GCJ 4.0 from thisiscool.com Hope someone can verify this bug. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21068
[Bug libgcj/21068] String(strBytes, "UTF-16LE"); thorws java.io.UnsupportedEncodingException
--- Additional Comments From gruni dot ca at gmail dot com 2005-04-17 17:27 --- Allright that solved this problem. Unfortunately I can not run the programm anymore in JDK after adding the static. Is there a way to keep my sources compatible with JDK and GCJ ? Regrads Andreas -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21068
