<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.2900.2523" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=094104312-09092005><FONT face=Arial size=2>I've recently been
tinkering with the effeciency of a process I have to take an XML document and
apply a lot of XPATH expressions to the XML. </FONT></SPAN></DIV>
<DIV><SPAN class=094104312-09092005><FONT face=Arial size=2>Here is what I've
done to maximize the effeciency of this process. Hoping others will have other
handy tricks up their sleeves or point out any</FONT></SPAN></DIV>
<DIV><SPAN class=094104312-09092005><FONT face=Arial size=2>glaring deficiency.
</FONT></SPAN></DIV>
<DIV><SPAN class=094104312-09092005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=094104312-09092005><FONT face=Arial size=2>The basic algorithm
of the process is this:</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV><SPAN class=094104312-09092005><FONT face=Arial size=2>1. Build a Map of
the XPATH's to apply to the XML. </FONT></SPAN><SPAN
class=094104312-09092005><FONT face=Arial size=2>The xpath expression is
cached as org.jdom.xpath.XPath objects</FONT></SPAN></DIV>
<DIV><SPAN class=094104312-09092005><FONT face=Arial size=2>2. For each XML
document to apply the Map of xpath expressions to</FONT></SPAN></DIV>
<DIV><SPAN class=094104312-09092005> <FONT face=Arial
size=2>3. Build the Document object from the XML
string </FONT></SPAN></DIV>
<DIV><SPAN class=094104312-09092005></SPAN><SPAN
class=094104312-09092005> <FONT face=Arial size=2>4. Loop
through the Map of XPath objects and apply each to the
message.</FONT></SPAN></DIV>
<DIV><SPAN class=094104312-09092005><FONT face=Arial size=2>5 Next XML
document</FONT></SPAN></DIV>
<DIV><SPAN class=094104312-09092005><FONT face=Arial
size=2></FONT></SPAN> </DIV></BLOCKQUOTE>
<DIV dir=ltr><SPAN class=094104312-09092005><FONT face=Arial
size=2>The things I've done to increase performance
are:</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV dir=ltr><SPAN class=094104312-09092005><FONT face=Arial size=2>1. Cached
the xpath expressions as org.jdom.xpath.XPath objects</FONT></SPAN></DIV>
<DIV dir=ltr><SPAN class=094104312-09092005><FONT face=Arial size=2>2. Ensure
the use of the SAXParser,
org.apache.xerces.parsers.SAXParser</FONT></SPAN></DIV>
<DIV dir=ltr><SPAN class=094104312-09092005><FONT face=Arial size=2>3. Make
each xpath expression as effecient as possible. For example, use
/*/*/MyElement instead of //MyElement. </FONT></SPAN></DIV>
<DIV dir=ltr><SPAN class=094104312-09092005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr><SPAN class=094104312-09092005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr><SPAN class=094104312-09092005><FONT face=Arial
size=2></FONT></SPAN> </DIV></BLOCKQUOTE></BODY></HTML>