MyContentHandler.java Source code

Introduction

Here is the source code for MyContentHandler.java

Source

import java.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;

class MyContentHandler implements ContentHandler {
    private Locator locator;

    public void setDocumentLocator(Locator locator) {
        this.locator = locator;
        System.out.println("-" + locator.getLineNumber() + "---Document ID: " + locator.getSystemId());
    }

    public void startDocument() {
        System.out.println("-" + locator.getLineNumber() + "---Document parse started");
    }

    public void endDocument() {
        System.out.println("-" + locator.getLineNumber() + "---Document parse ended");
    }

    public void startPrefixMapping(String prefix, String uri) {
        System.out.println("-" + locator.getLineNumber() + "---Namespace scope begins");
        System.out.println("     " + prefix + "=\"" + uri + "\"");
    }

    public void endPrefixMapping(String prefix) {
        System.out.println("-" + locator.getLineNumber() + "---Namespace scope ends");
        System.out.println("     " + prefix);
    }

    public void startElement(String namespaceURI, String localName, String qName, Attributes atts) {
        System.out.println("-" + locator.getLineNumber() + "---Opening tag of an element");
        System.out.println("       Namespace: " + namespaceURI);
        System.out.println("      Local name: " + localName);
        System.out.println("  Qualified name: " + qName);
        for (int i = 0; i < atts.getLength(); i++) {
            System.out.println("       Attribute: " + atts.getQName(i) + "=\"" + atts.getValue(i) + "\"");
        }
    }

    public void endElement(String namespaceURI, String localName, String qName) {
        System.out.println("-" + locator.getLineNumber() + "---Closing tag of an element");
        System.out.println("       Namespace: " + namespaceURI);
        System.out.println("      Local name: " + localName);
        System.out.println("  Qualified name: " + qName);
    }

    public void characters(char[] ch, int start, int length) {
        System.out.println("-" + locator.getLineNumber() + "---Character data");
        showCharacters(ch, start, length);
    }

    public void ignorableWhitespace(char[] ch, int start, int length) {
        System.out.println("-" + locator.getLineNumber() + "---Whitespace");
        showCharacters(ch, start, length);
    }

    public void processingInstruction(String target, String data) {
        System.out.println("-" + locator.getLineNumber() + "---Processing Instruction");
        System.out.println("         Target: " + target);
        System.out.println("           Data: " + data);
    }

    public void skippedEntity(String name) {
        System.out.println("-" + locator.getLineNumber() + "---Skipped Entity");
        System.out.println("           Name: " + name);
    }

    public void showCharacters(char[] ch, int start, int length) {
        System.out.print("        \"");
        for (int i = start; i < start + length; i++)
            switch (ch[i]) {
            case '\n':
                System.out.print("\\n");
                break;
            case '\r':
                System.out.print("\\r");
                break;
            case '\t':
                System.out.print("\\t");
                break;
            default:
                System.out.print(ch[i]);
                break;
            }
        System.out.println("\"");
    }
}

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());
    }
}

public class Main {
    public static String getXMLData() {
        return "<x></x>";
    }

    static public void main(String[] arg) {
        SAXParserFactory spf = SAXParserFactory.newInstance();
        XMLReader reader = null;
        try {
            SAXParser parser = spf.newSAXParser();
            reader = parser.getXMLReader();
        } catch (Exception e) {
            System.err.println(e);
            System.exit(1);
        }

        reader.setErrorHandler(new MyErrorHandler());
        reader.setContentHandler(new MyContentHandler());

        try {
            InputSource is = new InputSource(new StringReader(getXMLData()));
            reader.parse(is);
        } catch (SAXException e) {
            System.exit(1);
        } catch (IOException e) {
            System.err.println(e);
            System.exit(1);
        }
    }
}