Re: [xmlpull-user] Can you clone a pull parser? Particularly the xpp3 parser?

Nathaniel Hughes wrote:

>Alek, thanks for your response on this, sorry for my delay, I've been out 
>of town. 
>
>So I suspect you're right, I think my cloneable filereader was the 
>problem. Is it even possible to clone a FileReader? It seems that the pull 
>parser clone function works properly since it is successful with your 
>CloneableCharArrayReader.
>
>It seems that if FileReader isn't cloneable, then there really isn't a bug 
>in your xpp3 parser....or am I wrong?
>
>  
>
hi Nate,

just write new class something like CloneableFileReader extends Reader 
implements Cloneable {
    private File ...
    private long filepPos;}
and makes sure that its clone() will correctly deal with cloning File.

alek

>On Fri, 6 Feb 2004, Aleksander Slominski wrote:
>
>  
>
>>hi Nate,
>>
>>this is now tracked in bugzilla: 
>>http://www.extreme.indiana.edu/bugzilla/show_bug.cgi?id=177
>>
>>please login to bugzilla and add files with source code necessary to 
>>reproduce the problem.
>>
>>i suspect your cloneable reader did not work correctly so when cloned 
>>parser reads input it reads form original file and there is nothing to 
>>read ("java.io.EOFException: no more data available").
>>
>>thanks,
>>
>>alek
>>
>>Nathaniel Hughes wrote:
>>
>>    
>>
>>>So I'm having one slight problem using my cloned pull parser and I was 
>>>wondering if someone could help. Here's what I'm doing:
>>>
>>>I'm parsing a file, and at a certain point in the file, I clone my parser 
>>>(I actually do this multiple times) and store it. Then at a later point, I 
>>>retrieve that parser and begin parsing again. Well, I'm cloning my parser 
>>>like this:
>>>
>>>  do {
>>>       if(eventType == XmlPullParser.START_DOCUMENT) {
>>>           System.out.println("Start document");
>>>       } else if(eventType == XmlPullParser.END_DOCUMENT) {
>>>           System.out.println("End document");
>>>       } else if(eventType == XmlPullParser.START_TAG) {
>>>         ...
>>>	 if(//time to clone) {
>>>	   try {
>>>	     clonedParser = (CloneableMXParser) xpp.clone();
>>>	   }
>>>	   catch (CloneNotSupportedException e) {
>>>	     e.printStackTrace();
>>>	   }
>>>	   parserVec.add(clonedParser);
>>>	}
>>>           processStartElement(xpp);
>>>       } else if(eventType == XmlPullParser.END_TAG) {
>>>           processEndElement(xpp);
>>>         } else if(eventType == XmlPullParser.TEXT) {
>>>           processText(xpp);
>>>       }
>>>       eventType = xpp.next();
>>>   } while (eventType != XmlPullParser.END_DOCUMENT);
>>>
>>>
>>>When I try to begin parsing with my cloned parser again (running through 
>>>the same loop), I get this error (top of the stack trace here):
>>>
>>>java.io.EOFException: no more data available - expected end tags </TAGTWO></TAGONE> to close start tag <TAGTWO> from line 43 and start tag <TAGONE> from line 3, parser stopped on TEXT seen ... blah="366" blah2="34" blah3="this" blah4="2065" ... @43:162
>>>	at org.xmlpull.mxp1.MXParser.fillBuf(MXParser.java:2987)
>>>	at org.xmlpull.mxp1.MXParser.more(MXParser.java:2996)
>>>	at org.xmlpull.mxp1.MXParser.parseStartTag(MXParser.java:1769)
>>>	at org.xmlpull.mxp1.MXParser.nextImpl(MXParser.java:1126)
>>>	at org.xmlpull.mxp1.MXParser.next(MXParser.java:1092)
>>>	at com.watchguard.tests.PullParser.processDocument(PullParser.java:129)
>>>
>>>The parser starts parsing alright, it processes the first start, end and 
>>>text elements it pulls, but then, when it does a next and recieves the 
>>>next start tag, it throws this error.
>>>
>>>The depth at this point is 1 (which it should be) and the elRawName 
>>>contains both the TAGONE and TAGTWO char arrays, but TAGONE is the only 
>>>one that is still open, so this shouldn't be an issue.
>>>
>>>Hope this makes a little sense, any help would be great!
>>>
>>> 
>>>
>>>      
>>>
>>    
>>
>
>  
>


-- 
The best way to predict the future is to invent it - Alan Kay



 
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