Maximizing Effeciency of XPATH calls

Replies:

Kevin L. Cobb

Jason Hunter

Maximizing Effeciency of XPATH calls

Paul Libbrecht

Maximizing Effeciency of XPATH calls

Tatu Saloranta

Maximizing Effeciency of XPATH calls

Jason Hunter

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.

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

glaring deficiency.

The basic algorithm of the process is this:

1. Build a Map of the XPATH's to apply to the XML. The xpath expression is cached as org.jdom.xpath.XPath objects

2. For each XML document to apply the Map of xpath expressions to

3. Build the Document object from the XML string

4. Loop through the Map of XPath objects and apply each to the message.

5 Next XML document

The things I've done to increase performance are:

1. Cached the xpath expressions as org.jdom.xpath.XPath objects

2. Ensure the use of the SAXParser, org.apache.xerces.parsers.SAXParser

3. Make each xpath expression as effecient as possible. For example, use /*/*/MyElement instead of //MyElement.

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[jdom-interest] Maximizing Effeciency of XPATH calls

Kevin L. Cobb

2005-09-09