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How to convert Document object to Input Source ?

Hi all,

I am having a XML document objecy created on the fly. I need to validate it against Schema. I am using xerces 1.4.0. I have set features for the parser.Now i need to parse to validate the XML.

For this i need to call "parser.parse()". But parse() method takes "InputSource" as parameter. But i have Document object. How do i convert this Document object to "InputSource" for passing it to parse() method.

Can anybody help.

Best Regards,
Prasanna

ASKER CERTIFIED SOLUTION

ozymandias

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Wayne Bradney

Prasanna23,

You need to serialize the Document to a string (or maybe a file) using XMLSerializer(StringWriter, OutputFormat), and then construct a new InputSource from the string (or file) to pass to the parser using InputSource(StringReader).

Regards,
WMB

Prasanna23

ASKER

Hi ozymandias,
I tried the above method. Technically it looked fine. But when i tried to print the String got using e.toString() it just printed "[response:null]". "response" is my root element. I checked up my Document object it is not null.

Will Element.toString() work directly. I am toying over idea of XMLSerializer to get String. I have a slight doubt about Element.toString(). Please confirm about Element.toString() or is there any other method to convert it to String.

Thanks and Best Regards,
Prasanna

Prasanna23

ASKER

Hi,
Thanks to both of u. But i dont know whose answer to accept. Both are correct. I am in a fix. I couldnt find provision to accept both answers. What do i do?????

Thanks and Best Regards,
Prasanna

Prasanna23

ASKER

Thanks WMB & Ozymandias

Best Regards,
Prasanna

Wayne Bradney

Prasanna23,

Element.toString() will not return the XML representation of the Element. To produce XML, you need to know the output type and output format (encoding), and XMLSerializer provides that functionality.

Here's an example:
import java.io.*;
import org.apache.xerces.parsers.*;
import org.apache.xml.serialize.*;
import org.w3c.dom.*;
import org.xml.sax.*;

public class ElemString
{
public static void main(String[] args)
{
try
{
DOMParser parser = new DOMParser();
parser.parse(args[0]);
Document doc = parser.getDocument();

System.out.println("Trying toString()...");
Element elem = doc.getDocumentElement();
String xml = elem.toString();
System.out.println(xml);
System.out.println("Doesn't work!");

System.out.println("Trying serialize...");
StringWriter sw = new StringWriter();
XMLSerializer ser = new XMLSerializer(sw, new OutputFormat("xml", "UTF-8", true));
ser.serialize(doc);
xml = sw.toString();
System.out.println(xml);
System.out.println("Looks good!");

parser.parse(new InputSource(new StringReader(xml)));
System.out.println("Parsed OK!");
}
catch (Exception e)
{
e.printStackTrace();
}
}
}

Regards,
WMB

Prasanna23

ASKER

Thanks wmb,

I have done the same thing. I have used setOutputStream instead.

Thanks and Best Regards,
Prasanna