/* Copyright 2002, 2003 Elliotte Rusty Harold
This library is free software; you can redistribute it and/or modify
it under the terms of version 2.1 of the GNU Lesser General Public
License as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
You can contact Elliotte Rusty Harold by sending e-mail to
[email protected]. Please include the word "XOM" in the
subject line. The XOM home page is located at http://www.xom.nu/
*/
package nu.xom.samples;
import java.io.IOException;
import nu.xom.Builder;
import nu.xom.Document;
import nu.xom.Element;
import nu.xom.Elements;
import nu.xom.ParsingException;
/**
* <p>
* Demonstrates extracting the content
* of particular named elements
* in a particular context
* from an XML document.
* </p>
*
* @author Elliotte Rusty Harold
* @version 1.0
*
*/
public class ExampleLister {
private static int chapter = 0;
public static void list(Element root) {
chapter = 0;
if (root.getLocalName().equals("chapter")) {
chapter++;
exampleNumber = 0;
list(root);
}
else {
Elements elements = root.getChildElements();
for (int i = 0; i < elements.size(); i++) {
Element child = elements.get(i);
if (child.getLocalName().equals("chapter")) {
chapter++;
exampleNumber = 0;
findExamples(child);
}
else {
list(child);
}
}
}
}
private static int exampleNumber = 0;
private static void findExamples(Element element) {
Elements elements = element.getChildElements();
for (int i = 0; i < elements.size(); i++) {
Element child = elements.get(i);
if (child.getQualifiedName().equals("example")) {
printExample(child);
}
else {
findExamples(child);
}
}
}
private static void printExample(Element example) {
exampleNumber++;
Element title = example.getFirstChildElement("title");
String caption = "Example " + chapter + "." + exampleNumber
+ ": " + title.getValue();
System.out.println(caption);
}
public static void main(String[] args) {
if (args.length <= 0) {
System.out.println("Usage: java nu.xom.samples.ExampleLister URL");
return;
}
String url = args[0];
try {
Builder builder = new Builder();
// Read the document
Document document = builder.build(args[0]);
// List the examples
list(document.getRootElement());
}
catch (ParsingException ex) {
System.out.println(ex);
}
catch (IOException ex) {
System.out.println(
"Due to an IOException, the parser could not read " + url
);
System.out.println(ex);
}
} // end main
}
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