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| Using the DOM Parser to Build a Document Tree | |
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//Example XML document
/*
An XML Document Containing a Simple Contact List
<?xml version="1.0" standalone="yes"?>
<folks>
<person>
<phone>306 555-9999</phone>
<email>[email protected]</email>
<name>Wang, Joe</name>
</person>
<person>
<phone>704 555-0000</phone>
<name>Pet, Rob</name>
<email>[email protected]</email>
</person>
</folks>
*/
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
public class DOMDump {
static public void main(String[] arg) {
String filename = null;
boolean validate = false;
if (arg.length == 1) {
filename = arg[0];
} else if (arg.length == 2) {
if (!arg[0].equals("-v"))
usage();
validate = true;
filename = arg[1];
} else {
usage();
}
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setValidating(validate);
dbf.setNamespaceAware(true);
dbf.setIgnoringElementContentWhitespace(true);
// Parse the input to produce a parse tree with its root
// in the form of a Document object
Document doc = null;
try {
DocumentBuilder builder = dbf.newDocumentBuilder();
builder.setErrorHandler(new MyErrorHandler());
InputSource is = new InputSource(filename);
doc = builder.parse(is);
} catch (SAXException e) {
System.exit(1);
} catch (ParserConfigurationException e) {
System.err.println(e);
System.exit(1);
} catch (IOException e) {
System.err.println(e);
System.exit(1);
}
// Use a TreeDumper to list the tree
TreeDumper td = new TreeDumper();
td.dump(doc);
}
private static void usage() {
System.err.println("Usage: DOMCheck [-v] <filename>");
System.exit(1);
}
}
class TreeDumper {
public void dump(Document doc) {
dumpLoop((Node)doc,"");
}
private void dumpLoop(Node node,String indent) {
switch(node.getNodeType()) {
case Node.CDATA_SECTION_NODE:
System.out.println(indent + "CDATA_SECTION_NODE");
break;
case Node.COMMENT_NODE:
System.out.println(indent + "COMMENT_NODE");
break;
case Node.DOCUMENT_FRAGMENT_NODE:
System.out.println(indent + "DOCUMENT_FRAGMENT_NODE");
break;
case Node.DOCUMENT_NODE:
System.out.println(indent + "DOCUMENT_NODE");
break;
case Node.DOCUMENT_TYPE_NODE:
System.out.println(indent + "DOCUMENT_TYPE_NODE");
break;
case Node.ELEMENT_NODE:
System.out.println(indent + "ELEMENT_NODE");
break;
case Node.ENTITY_NODE:
System.out.println(indent + "ENTITY_NODE");
break;
case Node.ENTITY_REFERENCE_NODE:
System.out.println(indent + "ENTITY_REFERENCE_NODE");
break;
case Node.NOTATION_NODE:
System.out.println(indent + "NOTATION_NODE");
break;
case Node.PROCESSING_INSTRUCTION_NODE:
System.out.println(indent + "PROCESSING_INSTRUCTION_NODE");
break;
case Node.TEXT_NODE:
System.out.println(indent + "TEXT_NODE");
break;
default:
System.out.println(indent + "Unknown node");
break;
}
NodeList list = node.getChildNodes();
for(int i=0; i<list.getLength(); i++)
dumpLoop(list.item(i),indent + " ");
}
}
class MyErrorHandler implements ErrorHandler {
public void warning(SAXParseException e) throws SAXException {
show("Warning", e);
throw (e);
}
public void error(SAXParseException e) throws SAXException {
show("Error", e);
throw (e);
}
public void fatalError(SAXParseException e) throws SAXException {
show("Fatal Error", e);
throw (e);
}
private void show(String type, SAXParseException e) {
System.out.println(type + ": " + e.getMessage());
System.out.println("Line " + e.getLineNumber() + " Column "
+ e.getColumnNumber());
System.out.println("System ID: " + e.getSystemId());
}
}
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