// compare the size of the JDom Object and the DOM Object.

import java.io.*;
import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

public class Compare
{
    public Compare()
    {
        System.out.println("inside compare");        
    }
    
    public static void main(String args[])
    {
        Compare comp = new Compare();
        if (args.length > 0)
        {
            String fileName = args[0];
            System.out.println("Xml file to be parsed : " + fileName);                    
            
            int i = (new Integer(args[1])).intValue();
            prime();
            if (i == 1)
            {
                comp.buildDom(fileName);
            }
            System.gc();
            
            if (i == 2)
            {
                comp.buildJDom(fileName);
            }
        }
    }
    
    public void buildDom(String f)
    {
        
        try
        {
            System.out.println("inside build Dom");
            long start = System.currentTimeMillis();
            long startMem = java.lang.Runtime.getRuntime().freeMemory();    
            
            // dom parsing code here 
            org.apache.xerces.parsers.DOMParser parser = new org.apache.xerces.parsers.DOMParser();
            //parser.setFeature("http://apache.org/xml/features/dom/defer-node-expansion", true);
            //parser.setFeature("http://apache.org/xml/features/continue-after-fatal-error", true);
            //Errors errors = new Errors();
            //parser.setErrorHandler(errors);
            parser.parse(f);
            org.w3c.dom.Document document = parser.getDocument();            
            // end parsing code 
            
            long end = System.currentTimeMillis();
            long endMem = java.lang.Runtime.getRuntime().freeMemory();
            System.out.println("Time taken to build Dom: " + (end - start));
            System.out.println("Memory used to build Dom: " + (endMem - startMem));            
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }       
    }
    
    public void buildJDom(String f)
    {
        System.out.println("inside build JDom");
        try
        {
            long start = System.currentTimeMillis();
            long startMem = java.lang.Runtime.getRuntime().freeMemory();
            SAXBuilder builder = new SAXBuilder();
            org.jdom.Document doc = builder.build(new File(f));
            long end = System.currentTimeMillis();
            long endMem = java.lang.Runtime.getRuntime().freeMemory();
            System.out.println("Time taken to build JDom: " + (end - start));
            System.out.println("Memory used to build JDom: " + (endMem - startMem));        
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }       
    }

/**
 * 
 * <method>
 * 
 */
public static void prime() {
	
	//just run a xerces parse to "prime" the system
	SAXBuilder builder = new SAXBuilder();
	String sdoc = "<xml version=\"1.0\" ?><root><child /></root>";
	try {
    	org.jdom.Document doc = builder.build(new StringReader(sdoc));
	} catch (Exception e) {}
	
}
}