MainClass.java Source code

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Here is the source code for MainClass.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.w3c.dom.Text;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

public class MainClass implements ErrorHandler {
    public static void main(String args[]) throws Exception {
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
        builderFactory.setNamespaceAware(true);
        builderFactory.setValidating(true);

        DocumentBuilder builder = null;
        builder = builderFactory.newDocumentBuilder();
        builder.setErrorHandler(new MainClass());
        Document xmlDoc = null;
        xmlDoc = builder.parse(new File("y.xml"));
        listNodes(xmlDoc);
    }

    static void listNodes(Node node) {
        String nodeName = node.getNodeName();

        if (node instanceof Element) {
            if (node.hasAttributes()) {
                NamedNodeMap attrs = node.getAttributes();
                for (int i = 0; i < attrs.getLength(); i++) {
                    Attr attribute = (Attr) attrs.item(i); // Get an attribute
                    System.out.println(" " + attribute.getName() + "=" + attribute.getValue());
                }
            }
            System.out.println(indent + "<" + nodeName + ">");
        } else if (node instanceof Text) {
            System.out.println(((Text) node).getData());
        } else if (node instanceof DocumentType) {
            System.out.println(getDoctypeString((DocumentType) node));
        }

        indent.append(' ');
        NodeList list = node.getChildNodes();
        if (list.getLength() > 0) {
            for (int i = 0; i < list.getLength(); i++) {
                listNodes(list.item(i));
            }
        }
        System.out.println("</" + nodeName + ">");

    }

    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());
    }

    static StringBuffer indent = new StringBuffer("");

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

        if ((str = doctype.getSystemId()) != null) {
            doctypeStr.append(" SYSTEM ").append('\"').append(str).append('\"');
        }
        if ((str = doctype.getPublicId()) != null) {
            doctypeStr.append(" PUBLIC ").append('\"').append(str).append('\"');
        }
        if ((str = doctype.getInternalSubset()) != null) {
            doctypeStr.append('[').append(str).append(']');
        }
        return doctypeStr.append('>').toString();
    }
}