/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. 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
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* 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 the Apache Software Foundation and was
* originally based on software copyright (c) 1999, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
// This file uses 4 space indents, no tabs.
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import org.apache.xerces.parsers.DOMParser;
import org.apache.xalan.xpath.xml.FormatterToXML;
import org.apache.xalan.xpath.xml.TreeWalker;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;
/**
* Very basic utility for applying an XPath epxression to an xml file and printing information
/ about the execution of the XPath object and the nodes it finds.
* Takes 2 arguments:
* (1) an xml filename
* (2) an XPath expression to apply to the file
* Examples:
* java ApplyXPath foo.xml /
* java ApplyXPath foo.xml /doc/name[1]/@last
* @see XPathAPI
*/
public class ApplyXPath
{
protected String filename = null;
protected String xpath = null;
/** Process input args and execute the XPath. */
public void doMain(String[] args)
{
filename = args[0];
xpath = args[1];
if ((filename != null) && (filename.length() > 0)
&& (xpath != null) && (xpath.length() > 0))
{
InputSource in;
try
{
in = new InputSource(new FileInputStream(filename));
}
catch (FileNotFoundException fnf)
{
System.err.println("FileInputStream of " + filename + " threw: " + fnf.toString());
fnf.printStackTrace();
return;
}
// Use a DOMParser from Xerces so we get a complete DOM from the document
DOMParser parser = new DOMParser();
try
{
parser.parse(in);
}
catch(Exception e1)
{
System.err.println("Parsing " + filename + " threw: " + e1.toString());
e1.printStackTrace();
return;
}
// Get the documentElement from the parser, which is what the selectNodeList method expects
Node root = parser.getDocument().getDocumentElement();
NodeList nl = null;
try
{
// Use the simple XPath API to select a node.
nl = XPathAPI.selectNodeList(root, xpath);
// Use the FormatterToXML class right not instead of
// the Xerces Serializer classes, because I'm not sure
// yet how to make them handle arbitrary nodes.
FormatterToXML fl = new FormatterToXML(System.out);
TreeWalker tw = new TreeWalker(fl);
int n = nl.getLength();
for(int i = 0; i < n; i++)
{
tw.traverse(nl.item(i));
// We have to do both a flush and a flushWriter here,
// because the FormatterToXML rightly does not flush
// until it get's an endDocument, which usually will
// not happen here.
fl.flush();
fl.flushWriter();
}
}
catch (Exception e2)
{
System.err.println("selectNodeList threw: " + e2.toString() + " perhaps your xpath didn't select any nodes");
e2.printStackTrace();
return;
}
}
else
{
System.out.println("Bad input args: " + filename + ", " + xpath);
}
}
/** Main method to run from the command line. */
public static void main (String[] args)
{
if (args.length != 2)
{
System.out.println("java ApplyXPath filename.xml xpath\n"
+ "Reads filename.xml and applies the xpath; prints the nodelist found.");
return;
}
ApplyXPath app = new ApplyXPath();
System.out.println("<output>");
app.doMain(args);
System.out.println("</output>");
}
} // end of class ApplyXPath