Example 1: Remove Element Fragments
This example removes all the fragments evaluating to the XPath expression
/root/b. In all these examples, the table shows the XML for both the input and output.
| Input XML |
Output XML |
<root>
<a> text </a>
<b> text </b>
<c> text </c>
<a> text </a>
<b> text </b>
<c> text </c>
<a> text </a>
<b> text </b>
<c> text </c>
</root> |
<root>
<a> text </a>
<c> text </c>
<a> text </a>
<c> text </c>
<a> text </a>
<c> text </c>
</root> |
Here's the Java code:
import com.ximpleware.*;
public class removeFragments {
public static void main(String[] args) throws Exception{
VTDGen vg = new VTDGen();
AutoPilot ap = new AutoPilot();
XMLModifier xm = new XMLModifier();
ap.selectXPath("/root/b");
if (vg.parseFile("old.xml", false)) {
VTDNav vn = vg.getNav();
ap.bind(vn);
xm.bind(vn);
while(ap.evalXPath()!=-1){
xm.remove();
}
xm.output("new.xml");
}
}
}
import java.io.*;
public class arrangeFragments {
public static void writeFragment(
OutputStream os, long l, byte[] ba)
throws IOException {
int offset = (int) l;
int len = (int) (l >> 32);
os.write('\n');
os.write(ba, offset, len);
}
public static void main(String[] args)
throws Exception {
VTDGen vg = new VTDGen();
AutoPilot ap0 = new AutoPilot();
AutoPilot ap1 = new AutoPilot();
AutoPilot ap2 = new AutoPilot();
ap0.selectXPath("/root/a");
ap1.selectXPath("/root/b");
ap2.selectXPath("/root/c");
if (vg.parseFile("old.xml", false)) {
VTDNav vn = vg.getNav();
ap0.bind(vn);
ap1.bind(vn);
ap2.bind(vn);
FileOutputStream fos = new FileOutputStream("new.xml");
fos.write("<root>".getBytes());
byte[] ba = vn.getXML().getBytes();
while (ap0.evalXPath() != -1) {
long l = vn.getElementFragment();
writeFragment(fos,l,ba);
}
ap0.resetXPath();
while (ap1.evalXPath() != -1) {
long l = vn.getElementFragment();
writeFragment(fos,l,ba);
}
ap1.resetXPath();
while (ap2.evalXPath() != -1) {
long l = vn.getElementFragment();
writeFragment(fos,l,ba);
}
ap2.resetXPath();
fos.write('\n');
fos.write("</root>".getBytes());
}
}
}
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