Mega Code Archive
Listing the Contents of Parse Tree Nodes
<![CDATA[
/*
Code revised from
Java, XML, and JAXP by Arthur Griffith John Wiley & Sons 2002
*/
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Attr;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.Entity;
import org.w3c.dom.EntityReference;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Notation;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;
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) {
boolean validate = true;
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("personWithDTD.xml");
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);
}
dump(doc);
}
private static void dump(Document doc) {
dumpLoop((Node) doc, "");
}
private static void dumpLoop(Node node, String indent) {
switch (node.getNodeType()) {
case Node.ATTRIBUTE_NODE:
dumpAttributeNode((Attr) node, indent);
break;
case Node.CDATA_SECTION_NODE:
dumpCDATASectionNode((CDATASection) node, indent);
break;
case Node.COMMENT_NODE:
dumpCommentNode((Comment) node, indent);
break;
case Node.DOCUMENT_NODE:
dumpDocument((Document) node, indent);
break;
case Node.DOCUMENT_FRAGMENT_NODE:
dumpDocumentFragment((DocumentFragment) node, indent);
break;
case Node.DOCUMENT_TYPE_NODE:
dumpDocumentType((DocumentType) node, indent);
break;
case Node.ELEMENT_NODE:
dumpElement((Element) node, indent);
break;
case Node.ENTITY_NODE:
dumpEntityNode((Entity) node, indent);
break;
case Node.ENTITY_REFERENCE_NODE:
dumpEntityReferenceNode((EntityReference) node, indent);
break;
case Node.NOTATION_NODE:
dumpNotationNode((Notation) node, indent);
break;
case Node.PROCESSING_INSTRUCTION_NODE:
dumpProcessingInstructionNode((ProcessingInstruction) node, indent);
break;
case Node.TEXT_NODE:
dumpTextNode((Text) node, indent);
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 + " ");
}
/* Display the contents of a ATTRIBUTE_NODE */
private static void dumpAttributeNode(Attr node, String indent) {
System.out.println(indent + "ATTRIBUTE " + node.getName() + "=\"" + node.getValue() + "\"");
}
/* Display the contents of a CDATA_SECTION_NODE */
private static void dumpCDATASectionNode(CDATASection node, String indent) {
System.out.println(indent + "CDATA SECTION length=" + node.getLength());
System.out.println(indent + "\"" + node.getData() + "\"");
}
/* Display the contents of a COMMENT_NODE */
private static void dumpCommentNode(Comment node, String indent) {
System.out.println(indent + "COMMENT length=" + node.getLength());
System.out.println(indent + " " + node.getData());
}
/* Display the contents of a DOCUMENT_NODE */
private static void dumpDocument(Document node, String indent) {
System.out.println(indent + "DOCUMENT");
}
/* Display the contents of a DOCUMENT_FRAGMENT_NODE */
private static void dumpDocumentFragment(DocumentFragment node, String indent) {
System.out.println(indent + "DOCUMENT FRAGMENT");
}
/* Display the contents of a DOCUMENT_TYPE_NODE */
private static void dumpDocumentType(DocumentType node, String indent) {
System.out.println(indent + "DOCUMENT_TYPE: " + node.getName());
if (node.getPublicId() != null)
System.out.println(indent + " Public ID: " + node.getPublicId());
if (node.getSystemId() != null)
System.out.println(indent + " System ID: " + node.getSystemId());
NamedNodeMap entities = node.getEntities();
if (entities.getLength() > 0) {
for (int i = 0; i < entities.getLength(); i++) {
dumpLoop(entities.item(i), indent + " ");
}
}
NamedNodeMap notations = node.getNotations();
if (notations.getLength() > 0) {
for (int i = 0; i < notations.getLength(); i++)
dumpLoop(notations.item(i), indent + " ");
}
}
/* Display the contents of a ELEMENT_NODE */
private static void dumpElement(Element node, String indent) {
System.out.println(indent + "ELEMENT: " + node.getTagName());
NamedNodeMap nm = node.getAttributes();
for (int i = 0; i < nm.getLength(); i++)
dumpLoop(nm.item(i), indent + " ");
}
/* Display the contents of a ENTITY_NODE */
private static void dumpEntityNode(Entity node, String indent) {
System.out.println(indent + "ENTITY: " + node.getNodeName());
}
/* Display the contents of a ENTITY_REFERENCE_NODE */
private static void dumpEntityReferenceNode(EntityReference node, String indent) {
System.out.println(indent + "ENTITY REFERENCE: " + node.getNodeName());
}
/* Display the contents of a NOTATION_NODE */
private static void dumpNotationNode(Notation node, String indent) {
System.out.println(indent + "NOTATION");
System.out.print(indent + " " + node.getNodeName() + "=");
if (node.getPublicId() != null)
System.out.println(node.getPublicId());
else
System.out.println(node.getSystemId());
}
/* Display the contents of a PROCESSING_INSTRUCTION_NODE */
private static void dumpProcessingInstructionNode(ProcessingInstruction node, String indent) {
System.out.println(indent + "PI: target=" + node.getTarget());
System.out.println(indent + " " + node.getData());
}
/* Display the contents of a TEXT_NODE */
private static void dumpTextNode(Text node, String indent) {
System.out.println(indent + "TEXT length=" + node.getLength());
System.out.println(indent + " " + node.getData());
}
}
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());
}
}
//File: personWithDTD.xml
<?xml version="1.0" standalone="yes"?>
<!-- This document is both well formed and valid -->
<!DOCTYPE folks [
<!ELEMENT folks (person)*>
<!ELEMENT person (name, phone, email)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT phone (#PCDATA)>
<!ELEMENT email (#PCDATA)>
]>
<folks>
<person>
<name>B D</name>
<phone>999 555-8888</phone>
<email>b@xyz.net</email>
</person>
</folks>
DOCUMENT
COMMENT length=45
This document is both well formed and valid
DOCUMENT_TYPE: folks
ELEMENT: folks
ELEMENT: person
ELEMENT: name
TEXT length=15
Bertha D. Blues
ELEMENT: phone
TEXT length=12
999 555-8888
ELEMENT: email
TEXT length=14
b@xyz.net
]]>