Question

I have used script below and the output is
X value : 123
Y value : 123
X value : 123
Y value : 130

how can I set first X as X0; first Y as Y0 and second X as X1 and second Y as Y1 ? I used SAX parser, it has processed my input file properly, and now i want to define X0, X1, Y0, Y1 in order to draw line

public static void main(String argv[]) {

        try {

        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser saxParser = factory.newSAXParser();

        DefaultHandler handler = new DefaultHandler() {

        boolean xele = false;
        boolean yele = false;


        public void startElement(String uri, String localName,String qName, 
                    Attributes attributes) throws SAXException {

            if (qName.equalsIgnoreCase("X")) {
                xele = true;
            }

            if (qName.equalsIgnoreCase("Y")) {
                yele = true;
            }


        }
        public void characters(char ch[], int start, int length) throws SAXException {

            if (xele) {
                System.out.println("X value : " + new String(ch, start, length));
                xele = false;
            }

            if (yele) {
                System.out.println("Y value : " + new String(ch, start, length));
                yele = false;
            }


        }

         };

           saxParser.parse("c:\\input.xml", handler);

         } catch (Exception e) {
           e.printStackTrace();
         }

Thanks

Answer 1

You can declare arrays to hold the values of X and Y and an index to increment after storing the values every time characters method is called by the parser, in your DefaultHandler implementation and expose these arrays through getters. Alternatively, you can use collections like java.util.List/java.util.ArrayList to hold the values.

public static void main(String argv[])
{
    try
    {

        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser saxParser = factory.newSAXParser();

        MyDefaultHandler handler = new MyDefaultHandler();
        saxParser.parse("c:\\input.xml", handler);
        System.out.println(handler.getXList() + ", " + handler.getYList());
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

static class MyDefaultHandler extends DefaultHandler
{
    private List<Integer> xList = new ArrayList<Integer>();
    private List<Integer> yList = new ArrayList<Integer>();
    boolean xele = false;
    boolean yele = false;

    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException
    {

        if (qName.equalsIgnoreCase("X"))
        {
            xele = true;
        }

        if (qName.equalsIgnoreCase("Y"))
        {
            yele = true;
        }

    }

    public void characters(char ch[], int start, int length) throws SAXException
    {

        if (xele)
        {
            System.out.println("X value : " + new String(ch, start, length));
            xele = false;
            xList.add(Integer.parseInt(new String(ch, start, length)));
        }

        if (yele)
        {
            System.out.println("Y value : " + new String(ch, start, length));
            yele = false;
            yList.add(Integer.parseInt(new String(ch, start, length)));
        }
    }

    public List<Integer> getXList()
    {
        return xList;
    }

    public List<Integer> getYList()
    {
        return yList;
    }

};