/**  Copyright (c) 2001 Sun Microsystems, Inc.  All rights*  reserved.**  Redistribution and use in source and binary forms, with or without*  modification, are permitted provided that the following conditions*  are met:**  1. Redistributions of source code must retain the above copyright*  notice, this list of conditions and the following disclaimer.**  2. Redistributions in binary form must reproduce the above copyright*  notice, this list of conditions and the following disclaimer in*  the documentation and/or other materials provided with the*  distribution.**  3. The end-user documentation included with the redistribution,*  if any, must include the following acknowledgment:*  "This product includes software developed by the*  Sun Microsystems, Inc. for Project JXTA."*  Alternately, this acknowledgment may appear in the software itself,*  if and wherever such third-party acknowledgments normally appear.**  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"*  must not be used to endorse or promote products derived from this*  software without prior written permission. For written*  permission, please contact Project JXTA at http://www.jxta.org.**  5. Products derived from this software may not be called "JXTA",*  nor may "JXTA" appear in their name, without prior written*  permission of Sun.**  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED*  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES*  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE*  DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR*  ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,*  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT*  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF*  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND*  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,*  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT*  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF*  SUCH DAMAGE.*  ====================================================================**  This software consists of voluntary contributions made by many*  individuals on behalf of Project JXTA.  For more*  information on Project JXTA, please see*  <http://www.jxta.org/>.**  This license is based on the BSD license adopted by the Apache Foundation.**  $Id: NRSSDataExtractor.java,v 1.2 2006/07/13 05:26:36 nano Exp $*///package net.java.netbeams.protocol;package net.jxta.myjxta.misc.beam;import org.xml.sax.InputSource;import javax.xml.parsers.DocumentBuilderFactory;import java.io.IOException;import java.io.InputStream;import java.net.URL;import java.net.URLConnection;/** * @author dave */public class NRSSDataExtractor {    /**     * Creates a new instance of NRSSDataExtractor     */    public NRSSDataExtractor() {    }    public static String getValueFromString(String input, String expression) {        String returnValue = new String();        //see http://www.docjar.com/html/api/java/io/Reader.java.html        java.io.StringReader sr = new java.io.StringReader(input);        //see http://www.docjar.com/html/api/org/xml/sax/InputSource.java.html        org.xml.sax.InputSource inputSource = new org.xml.sax.InputSource(sr);        try {            // Example used            // http://www.onjava.com/pub/a/onjava/2005/01/12/xpath.html// xxx: gonzo, 1.5 goodness/*            XPathFactory factory2=XPathFactory.newInstance();            XPath xPath = factory2.newXPath();            NamespaceContext namespaceContext=new NamespaceContextImpl(NameSpaceName, NameSpaceURL);            xPath.setNamespaceContext(namespaceContext);*/            // passed            //XPathExpression xPathExpression = xPath.compile("/rss/channel/item/description/nrss:metadata/nrss:arg[@n='size']");            // passed            //XPathExpression xPathExpression = xPath.compile("/rss/channel/item/description/nrss:data/nrss:content/nrss:argArray[@n='current']");            // passed            //XPathExpression xPathExpression = xPath.compile("/rss/channel/title");            //String expression = "/rss/channel/item/description/nrss:data/nrss:content/nrss:argArray[@n='current']";            //xPathExpression.evaluate(inputSource, returnType)            // See http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/xpath/package-summary.html// xxx: gonzo, 1.5 goodness/*            XPathExpression xPathExpression = xPath.compile(expression);            returnValue = xPathExpression.evaluate(inputSource);*/            returnValue = null;            // String returnValue = xPath.evaluate(expression, inputSource);            //is.close();            //System.out.println("value = "+value.toString());        } catch (Exception e) {            e.printStackTrace();        }        return returnValue;    }    // Example Used: http://www.idevelopment.info/data/Programming/java/xml/DOMExample.java    public static String getValueFromInputStream(InputStream is, String expression) {        String returnValue = new String();        try {            // Example used            // http://www.onjava.com/pub/a/onjava/2005/01/12/xpath.html// xxx: gonzo, 1.5 goodness/*            XPathFactory factory2=XPathFactory.newInstance();            XPath xPath = factory2.newXPath();            NamespaceContext namespaceContext=new NamespaceContextImpl(NameSpaceName, NameSpaceURL);            xPath.setNamespaceContext(namespaceContext);*/            // passed            //XPathExpression xPathExpression = xPath.compile("/rss/channel/item/description/nrss:metadata/nrss:arg[@n='size']");            // passed            //XPathExpression xPathExpression = xPath.compile("/rss/channel/item/description/nrss:data/nrss:content/nrss:argArray[@n='current']");            // passed            //XPathExpression xPathExpression = xPath.compile("/rss/channel/title");            InputSource inputSource = new InputSource(is);            //String expression = "/rss/channel/item/description/nrss:data/nrss:content/nrss:argArray[@n='current']";            //xPathExpression.evaluate(inputSource, returnType)            // See http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/xpath/package-summary.html// xxx: gonzo, 1.5 goodness/*            XPathExpression xPathExpression = xPath.compile(expression);            returnValue = xPathExpression.evaluate(inputSource);*/            returnValue = null;            // String returnValue = xPath.evaluate(expression, inputSource);            is.close();            //System.out.println("value = "+value.toString());        } catch (Exception e) {            e.printStackTrace();        }        return returnValue;    }    public static String getValueFromURL(String nrssURL, String expression) {        // get the NRSS        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();        try {            // Example used            // http://java.sun.com/docs/books/tutorial/networking/urls/readingWriting.html            URL u = new URL(nrssURL);            URLConnection c = u.openConnection();            InputStream is = c.getInputStream();            return getValueFromInputStream(is, expression);        } catch (IOException e) {            e.printStackTrace();            // log.severe(e.toString());        } catch (Exception ea) {            // log.severe(ea.toString());            ea.printStackTrace();        }        return null;    }    public static void main(String[] args) {        String url = "http://fuzzy.sfbay.sun.com/~tl109030/samplenrss02.xml";        String expression = "/rss/channel/item/description/nrss:data/nrss:content/nrss:argArray[@n='current']/nrss:arg[@n='value']";        //String expression = "/rss/channel/title";        try {            String result = getValueFromURL(url, expression);            System.out.println("Result: " + result);        } catch (Exception e) {            e.printStackTrace();        }        try {            // Example used            // http://java.sun.com/docs/books/tutorial/networking/urls/readingWriting.html            URL u = new URL(url);            URLConnection c = u.openConnection();            InputStream is = c.getInputStream();            System.out.println("getVAlueFromInputStream: " + getValueFromInputStream(is, expression));        } catch (IOException e) {            e.printStackTrace();            // log.severe(e.toString());        } catch (Exception ea) {            // log.severe(ea.toString());            ea.printStackTrace();        }//        System.err.println("Usage: java NRSS2Array <url> <expression>");        // add interface that handles InputStream    }}