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Posted to dev@commons.apache.org by bu...@apache.org on 2003/12/09 13:41:40 UTC
DO NOT REPLY [Bug 25357] New: -
Enumeration in Service broken
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=25357
Enumeration in Service broken
Summary: Enumeration in Service broken
Product: Commons
Version: Nightly Builds
Platform: Other
OS/Version: Other
Status: NEW
Severity: Normal
Priority: Other
Component: Discovery
AssignedTo: commons-dev@jakarta.apache.org
ReportedBy: matthew_pocock@yahoo.co.uk
The Enumeration in org.apache.commons.discovery.tools.Service is broken - it
will only work in the (admittedly common) case where you do:
while(e.hasMoreElements()) e.nextElement();
If you repeatedly call nextElement(), you will get the wrong results. In
particular, this uggly but technically correct code will fail to behave sanely:
try {
while(true)
e.nextElement();
} catch (NoSuchElementException e) {
}
The code needs hacking arround to look something more like this:
return new Enumeration() {
private Object object = getNextClassInstance();
public boolean hasMoreElements() {
return object != null;
}
public Object nextElement() {
if(object == null) {
throw new NoSuchElementException();
}
Object obj = object;
object = getNextClassInstance();
return obj;
}
private Object getNextClassInstance() {
// as before
}
};
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