Avoid network access fetching the DTD

[Valentin Ruano <vr...@softhome.net>]

Hi everyone,

Any body knows how avoid any network access when parsing a XML file with
Xerces or Crimson. The application I am developing has to deal with full
qualified XML sources (I mean with public dtd URLs) and must work without
network connection. I know that I would lose the syntax check, but that is
not important.

Any suggestion?

   thanks a lot, Valentin



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Re: Avoid network access fetching the DTD

[Gottfried Szing <go...@szing.at>]

On Tue, 2002-04-16 at 12:19, Valentin Ruano wrote:
> Hi everyone,
> 
> Any body knows how avoid any network access when parsing a XML file with
> Xerces or Crimson. The application I am developing has to deal with full
> qualified XML sources (I mean with public dtd URLs) and must work without
> network connection. I know that I would lose the syntax check, but that is
> not important.

i am using a modified EnityResolver which checks first the location of
the dtd/xsd and if this is not a http request, the default resolver is
called. the class Check is a local class which verifies if the file is
local. i havbe removed some internal checks - so this code is note
compilable.

import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author Gottfried Szing
 * @version $Revision: 1.5 $ $Name:  $
 */
public class ESIEntityResolver
        implements EntityResolver
{
    private EntityResolver defaultres = null;

    /**
     * inits the resolver
     */
    public ESIEntityResolver()
    {
        defaultres = new DefaultHandler();
    }

    /**
     * This attempts to resolve the entity associated with the specified
     * public and system ids. If the systemId is empty, then we use the
     * publicId to locate the URL of the cataloged DTD file.
     */
    public InputSource resolveEntity(String publicId, String systemId)
            throws SAXException, IOException
    {
        if (systemId != null || publicId != null)
        {
            if (Check.isLocal(systemId) && Check.isLocal(publicId))
	       	 return  defaultres.resolveEntity(publicId,systemId);
	}

	return null;
    }

    /**
     * Return the URL of the DTD corresponding to the systemId.
     */
    private static final String getUrl(String systemId)
    {
        if (null == systemId)
            return null;

        File file = new File(systemId);
        String name = file.getName();
        return name;
    }
}