escapd XML writing/reading/parsing queries

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Piper707@hotmail.com - 12 Dec 2005 05:24 GMT

Hi,

My <operator> tag in XML can take any of the following values:

"<", ">", and "<>"

I enter the data this way in the xml:

<operator><</operator>
<operator>></operator>

This works fine for the first two.

1) How do I enter "<>" as data in the xml document? I tried
<operator>><</operator>, but that only reads the first value,
i.e. "<".

2) After parsing the field, I need to match the data to the content of
an List, and return the matched index:

XML tag:
--------
<OPERATOR><</OPERATOR>

This is the method
------------------

List operatorList = Arrays.asList("<>", "<>", "<" ,"<", ">"
,">");

public void setOperator(String operator){
System.out.println("operator sent" + " ----> " + operator);
System.out.println("operator index" + " ----> " +
operatorList.indexOf(operator));
}

Method Output:
---------------

operator sent ----> <
operator index ----> -1

It is unable to find either "<" or ">" in my list, I can't understand
why?

3) However when I try this:

if(operator.equals("<"))
System.out.println("received <");

It prints out "received <" correctly.

Can someone please clarify?

Thank you,
Rohit.

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Oliver Wong - 12 Dec 2005 23:06 GMT

> Hi,
>
[quoted text clipped - 49 lines]
>
> Can someone please clarify?

Can you post an SSCCE?

http://www.physci.org/codes/sscce.jsp

I'm not saying this just to be a pain, but there are so many places
where the error can be occuring, especially with respect to (1). Are you
escape too many times? Not enough times? Etc.

Try to post a small program and XML file such that the problem in (1) is
clearly demonstrated. E.g. the XML file should be something like
"<op><></op>" and the program shoud output to console "<". From there
we can see exactly what you're doing wrong.

- Oliver

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Piper707@hotmail.com - 13 Dec 2005 04:35 GMT

Hi Oliver,

Strangely, part of the problem seems to have fixed itself. It works
okay for "<" and ">", but I'm still having trouble with the "<>" bit.

Try the foll program with this XML:

<TEST>
<OPERATOR>
<>
</OPERATOR>
</TEST>

I'm expecting >< to match up with index 4, rather it matches up
with 2, corresponding to "<"

-----------------------------------------------------------------------
import javax.xml.stream.*;
import javax.xml.stream.events.*;
import java.io.*;
import java.util.Arrays;
import java.util.List;

public class MyExample{

public static void main(String[] args){

List operatorList = Arrays.asList(">", ">", "<", "<", "<>",
"<>");

try{
XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
XMLEventReader xmlEventReader =
xmlInputFactory.createXMLEventReader(new
FileInputStream("d:\\testing\\myexample.xml"));

while(xmlEventReader.hasNext())
{
XMLEvent xmlEvent = xmlEventReader.nextEvent();
if(xmlEvent.isStartElement())
{
StartElement startElement = (StartElement)xmlEvent;

if(startElement.getName().toString().equals("OPERATOR"))
{
Characters charactersEvent = (Characters)
xmlEventReader.nextEvent();
String operator = charactersEvent.getData().trim();
System.out.println("operator sent ----> " +
operator);
System.out.println("index found ----> " +
operatorList.indexOf(operator));
}
}//if
}//while
}//try
catch(Exception e)
{
e.printStackTrace();
}
}//main
}//class

-----------------------------------------------------------------------

1) The parsing mtd is StaX, i wonder if the parser implementation could
be a problem?

2) Probably a silly question, I run programs using Eclipse, is it
possible for the JVM to maintain some sort of a "cache", which could
fudge my results? I ran this thing as part of my program about 10 times
yesterday and it wouldn't recognize "<" or ">" either. But today, I'm
only having trouble with <>!

Thanks
Rohit.

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escapd XML writing/reading/parsing queries

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