Thanks, I think I have the idea.
(ns ziptest
(:require [clojure.zip :as zip]
[clojure.xml :as xml]
[clojure.contrib.zip-filter :as zf])
(:use clojure.contrib.zip-filter.xml)
(:import (java.io ByteArrayInputStream)))
(def *xml-string*
"<a1><b1><c1>a1b1c1</c1><c2>a1b1c2</c2></b1><b2><c1>a1b2c1</c1></b2></a1>")
(defn string-to-zip [s]
(zip/xml-zip (xml/parse (ByteArrayInputStream. (.getBytes s)))))
(defn parse-xml [string]
(doseq [x (xml-> (string-to-zip string) zf/descendants :c1)]
(println "---> " (:content (first x)))))
(parse-xml *xml-string*)
[dr...@drowe][h:10013][J:0]> ./clojure src/ziptest.clj
---> [a1b1c1]
---> [a1b2c1]
On Wed, Dec 2, 2009 at 11:38 AM, pmf <[email protected]> wrote:
> On Dec 2, 4:51 pm, Dennis <[email protected]> wrote:
> > The XML is of the form:
> > ganglia
> > multiple clusters
> > multiple hosts
> > multiple metrics
>
> Use XPath. Seriously, I hate XML and XSLT, but XPath is simply the
> most concise way to extract things from a nested structure. Most XPath-
> libraries allow for precompilation of XPath-expressions (similar to
> RegEx-precompilation) and don't require the whole XML-file to reside
> in memory, which makes this a nice solution for huge XML-files (though
> in your case this is probably no issue).
>
> To get a list of all metrics in all hosts in all clusters, you'd
> simply use the XPath-expression "ganglia/cluster/host/metric" against
> an XML-document; recursive fetching (if clusters could contain other
> clusters) could be done by using a double slash instead of a single
> slash.
>
> A Clojure-solution for a similar expression language would be
> clojure.contrib.zip-filter.xml, though I did not use it, but you might
> try it out.
>
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