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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] XPath filter for SAX in Java
 This sounds like something that would be very useful, and obvious - and yet after spending quite some time searching I've yet to find a concrete implementation! I've caught whispers here and there that it can be done, perhaps by hooking into the Saxon or Xalan libraries, but in the end it's still elluding me. So what is it? I just want to be able to (in Java - and 1.5 is fine) give an XML document to a SAX parser and have events fired when certain, pre-registered, XPath expressions are matched. To put it another way, I want to layer a set of XPath filters over a SAX parser. Naturally only a subset of XPath is meaningful within the SAX context, and ideally I'd like to see a couple of extensions to cater for the dynamic nature of SAX parsing (in particular, a way of specifying "node tests" for closing tags). An example could be something like (pseudo code): SaxPathParser parser = new SaxPathParser(); parser.AddHandler( "/TestDoc/Node1/Node2", new NodeHandler() ); parser.AddHandler( "/TestDoc/Node1/text()", new TextHandler() ); parser.AddHandler( "//Node3/endtag()", new EndTagHandler() ); parser.parse(); I've started an implementation along the above lines that wraps a JAXP SAX parser, but handling things like the // operator efficiently is something that I'd rather leave to a dedicated library if possible. So does anyone know of an XPath filter for SAX parsers, or something which achieves essentially the same thing? I really don't want to have to parse a full DOM tree when I just want to catch a few XPath specified nodes. Thanks and best regards, [)o IhIL.. 
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