package com.alethis.xml;

import org.xml.sax.XMLReader;
import org.xml.sax.InputSource;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;
import org.xml.sax.ErrorHandler;
import org.xml.sax.DTDHandler;
import org.xml.sax.EntityResolver;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.AttributesImpl;
import org.xml.sax.helpers.XMLFilterImpl;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import java.io.*;

public class GenerateUsingXMLFilter {
    
    private final static String OUTPUT_FILE = "C:\\project\\xml\\out.xml";
    
    public final static void main(String[] args) {   
        try {
            XMLReader generator = new GeneratorUsingXMLFilter();
            SAXSource source = new SAXSource(generator, new InputSource());

            File f = new File(OUTPUT_FILE);
            FileWriter fw = new FileWriter(f);
            BufferedWriter bw = new BufferedWriter(fw);
            StreamResult result = new StreamResult(bw);

            TransformerFactory factory = TransformerFactory.newInstance();
            Transformer transformer = factory.newTransformer();      
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");            
            transformer.transform(source, result);
            
            System.out.println("DONE");
        }
        catch (TransformerConfigurationException e) {
            System.out.println("Transformer Configuration Exception: " + e.getMessage());
        }
        catch (TransformerException e) {
            System.out.println("Transformer Exception: " + e.getMessage());
        }
        catch (IOException e) {
            System.out.println("IO Exception: " + e.getMessage());
        }           
    }    
}
    
class GeneratorUsingXMLFilter extends XMLFilterImpl {
    
    private final static Attributes EMPTY_ATTRS = new AttributesImpl();
    
    private final static String FAMILY = "family";
    private final static String FATHER = "father";
    private final static String MOTHER = "mother";
    private final static String CHILDREN = "children";
    private final static String CHILD = "child";
    
    private final static String AGE = "age";
    
    public void parse(InputSource is) throws SAXException {
        generate();
    }
    
    public void parse(String systemId) throws SAXException {
        generate();
    }
    
    private void generate() throws SAXException {
        startDocument();
        
        startElement("", FAMILY, FAMILY, EMPTY_ATTRS);
        
        addElement(FATHER, "Michael", "49");
        addElement(MOTHER, "Margaret", "46");
        
        startElement("", CHILDREN, CHILDREN, EMPTY_ATTRS);
        addElement(CHILD, "Chloe", "12");
        addElement(CHILD, "Adrian", "10");
        endElement("", CHILDREN, CHILDREN);
        
        endElement("", FAMILY, FAMILY);

        endDocument();
    }
    
    private void addElement(String element, String name, String age) throws SAXException {
        AttributesImpl ageAttrs = new AttributesImpl();
        ageAttrs.addAttribute("", AGE, AGE, "CDATA", age);
        startElement("", element, element, ageAttrs);
        characters(name.toCharArray(), 0, name.length());
        endElement("", element, element);
    }
}