TryDOM.java Source code

Introduction

Here is the source code for TryDOM.java

Source

    import java.io.File;

    import javax.xml.parsers.DocumentBuilder;
    import javax.xml.parsers.DocumentBuilderFactory;

    import org.w3c.dom.Attr;
    import org.w3c.dom.Document;
    import org.w3c.dom.DocumentType;
    import org.w3c.dom.Element;
    import org.w3c.dom.NamedNodeMap;
    import org.w3c.dom.Node;
    import org.w3c.dom.NodeList;
    import org.xml.sax.ErrorHandler;
    import org.xml.sax.SAXException;
    import org.xml.sax.SAXParseException;

    public class TryDOM implements ErrorHandler {
        public static void main(String args[]) throws Exception {

            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
            builderFactory.setNamespaceAware(true);
            builderFactory.setValidating(true);
            builderFactory.setIgnoringElementContentWhitespace(true);

            DocumentBuilder builder = null;
            builder = builderFactory.newDocumentBuilder();
            builder.setErrorHandler(new TryDOM());
            Document xmlDoc = builder.parse(new File("y.xml"));
            DocumentType doctype = xmlDoc.getDoctype();
            System.out.println("DOCTYPE node:\n" + getDoctypeString(doctype));
            listNodes(xmlDoc.getDocumentElement(), "");
        }

        private static String getDoctypeString(DocumentType doctype) {
            String str = doctype.getName();
            StringBuffer doctypeStr = new StringBuffer("<!DOCTYPE ").append(str);

            final char QUOTE = '\"';
            if ((str = doctype.getSystemId()) != null)
                doctypeStr.append(" SYSTEM ").append(QUOTE).append(str).append(QUOTE);
            else if ((str = doctype.getPublicId()) != null) // Check for a public ID
                doctypeStr.append(" PUBLIC ").append(QUOTE).append(str).append(QUOTE);

            if ((str = doctype.getInternalSubset()) != null)
                doctypeStr.append('[').append(str).append(']');

            return doctypeStr.append('>').toString(); // Append '>', return the string
        }

        static void listNodes(Node node, String indent) {
            String nodeName = node.getNodeName();
            System.out.println(indent + nodeName + " Node, type is " + node.getClass().getName() + ":");
            System.out.println(node);

            if (node instanceof Element && node.hasAttributes()) {
                NamedNodeMap attrs = node.getAttributes();
                for (int i = 0; i < attrs.getLength(); i++) {
                    Attr attribute = (Attr) attrs.item(i);
                    System.out.println(indent + attribute.getName() + "=" + attribute.getValue());
                }
            }
            NodeList list = node.getChildNodes();
            if (list.getLength() > 0) {
                System.out.println(indent + "Child Nodes of " + nodeName + " are:");
                for (int i = 0; i < list.getLength(); i++)
                    listNodes(list.item(i), indent + " ");
            }
        }

        public void fatalError(SAXParseException spe) throws SAXException {
            System.out.println("Fatal error at line " + spe.getLineNumber());
            System.out.println(spe.getMessage());
            throw spe;
        }

        public void warning(SAXParseException spe) {
            System.out.println("Warning at line " + spe.getLineNumber());
            System.out.println(spe.getMessage());
        }

        public void error(SAXParseException spe) {
            System.out.println("Error at line " + spe.getLineNumber());
            System.out.println(spe.getMessage());
        }
    }<?xml version="1.0"?>

<!DOCTYPE circle 
[
   <!ELEMENT circle (position)>
   <!ATTLIST circle 
             radius CDATA #REQUIRED
   >

   <!ELEMENT position EMPTY>
   <!ATTLIST position 
             x CDATA #REQUIRED
             y CDATA #REQUIRED
   >
]>

<circle radius="15">
  <position x="30" y="50"/>
</circle>