[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] [proposal] XPath API for Java
Hi, I've been through a ton of DOM-in-Java programming in the last 12 months. You learn early on to use XPaths where possible to keep the code flexible and clean. But one of the annoying about using XPath in Java is that it's all library specific. The last thing I want to have to do is go through all my code and replace Xalan stuff with Jaxen stuff or Jaxen stuff with DOML3 stuff. So here's a proposed api: package net.amadan.markup.xpath; import java.util.Map; import org.w3c.dom.Node; public interface XPath { /** * Match a xpath over a DOM Node.<p> * * * @param target the Node to match against. * @param xpath the xpath as a String * @param namespaces keys are namespace URIs, * values are namespace prefixes. * @return the Nodes matching the expression, a size of 0 indicates no match. * @throws IllegalArgumentException if the xpath is illegal or a prefix is not bound to a key in <tt>namespaces</tt> */ List match( Node target, String xpath, Map namespaces ); } I don't ever seem to need the extra step of preparing an xpath object and applying it later to a Node. I also figure managing any expression caching and so on is a fun thing to do for the implementor but gorp for the user. Next step is a factory/plugin to this so anyone that does xpath in java can register a provider. It'll be the usual "FactoryFactory.getFactory().newInstance()" dance using a System property ("net.amadan.markup.xpath.driver"). Bill de hÓra
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