import java.io.*;
import java.util.*;
import com.ximpleware.*;

public class TransformVTD {

    public static byte[] getBytesFromFile(File file) throws IOException {
        InputStream is = new FileInputStream(file);
        long length = file.length();

        byte[] bytes = new byte[(int)length];

        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length
               && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
            offset += numRead;
        }

        if (offset < bytes.length) {
            throw new IOException("Could not completely read file "+file.getName());
        }

        is.close();
        return bytes;
    }

    public static void main(String args[]) {
        test(true);
        test(true);
        test(true);
        test(true);
        test(true);
        test(true);
        test(true);
        test(true);
        test(true);
        test(true);
    }

    public static void test(boolean forReal) {
        XMLModifier xm = new XMLModifier();
        VTDGen vg = new VTDGen();
        VTDNav vn = null;
        AutoPilot ap = new AutoPilot();
        long start;
        long end;
        int kk=10;
        double time = 0.0;
        int i=0;
        int j = 0;
        double res = 0;


        try {
            byte[] content = getBytesFromFile(new File("blog.xml"));
            ByteArrayOutputStream baos = new ByteArrayOutputStream(content.length * 2);
            start = System.currentTimeMillis();

            for (int ii=0; ii<kk; ii++) {
                vg.setDoc(content);
                vg.parse(false);
                vn = vg.getNav();
                xm.bind(vn);
                ap = new AutoPilot();
                ap.selectXPath("//item");
                ap.bind(vn);
                while ((i=ap.evalXPath()) != -1) {
                    j++;
                    //do nothing, just iterate through them
                }
                ap.resetXPath();
                ap.selectXPath("/blog/item");
                ap.bind(vn);
                while ((i=ap.evalXPath()) != -1) {
                    j++;
                    //do nothing, just iterate through them
                }
                ap.resetXPath();
                ap.selectXPath("//text()");
                ap.bind(vn);
                while ((i=ap.evalXPath()) != -1) {
                    j++;
                    //do nothing, just iterate through them
                }
                ap.resetXPath();
                ap.selectXPath("count(//item)");
                ap.bind(vn);
                res = ap.evalXPathToNumber();
                ap.resetXPath();
                ap.selectXPath("count(/blog/item)");
                ap.bind(vn);
                res = ap.evalXPathToNumber();
                ap.resetXPath();
                ap.selectXPath("/blog/item[@num='a781']");
                ap.bind(vn);
                while ((i=ap.evalXPath()) != -1) {
                    j++;
                    //xm.remove();
                }
                ap.resetXPath();
                ap.selectXPath("/blog/item/body/p/a");
                ap.bind(vn);
                while ((i=ap.evalXPath()) != -1) {
                    j++;
                    xm.remove();
                }

                //xm.output(baos);
                xm.reset();
                //baos.reset();
            }

            end = System.currentTimeMillis();
            time = (end - start) / kk;
            System.err.println("average cycle time  (ms): " + time);

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

}