[Sax-devel] Resolve all entities

[Vallone, P. Mr C. U. A. <Phi...@us...>]

Hi,

I was wondering if you could provide some guidance on resolving entities
before they are processed. I have the following java code that will list
an entities systemIDs referenced in an XML document. This works well
except if I have an entity referenced that references a list of entities
(like a catalog of entities) or an entity that is not used. 

The following XML returns:

System ID: file:/C:/path/driverlicense.dtd
System ID: file:/C:/path/phone.ent

Since "commonEnties" was not used, nothing is returned. How do I return
all entites files referenced?


********code***********
Sample XML test.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE DRIVERSLICENSE SYSTEM "driverlicense.dtd" [
	<!ENTITY phone SYSTEM "phone.ent">
	<!ENTITY % commonEnties SYSTEM 'c:/temp/common.ent'> 
	%commonEnties;
]>
<?xml-stylesheet type="text/xsl" href="driverslicense.xslt"?>
<DRIVERSLICENSE>
	<NAME nickname="Joey">JOE</NAME>
	<STREET>1313 Mocking Bird</STREET>
	<CITY>Here</CITY>
	<STATE>NY</STATE>
	<ZIP>11738</ZIP>
	<CELL>123-456-7890</CELL>
	&phone;
</DRIVERSLICENSE>


Java code:

private void resolver(java.awt.event.ActionEvent evt) {

        try {
            // Create an XML parser
            DocumentBuilder builder =
DocumentBuilderFactory.newInstance().newDocumentBuilder();
            // Install the entity resolver
            builder.setEntityResolver(new MyResolver());
            // Parse the XML file
            org.w3c.dom.Document doc = builder.parse(new
File("C:/path/test.xml"));

        } catch (SAXException e) {
        // A parsing error occurred; the xml input is not valid
        } catch (ParserConfigurationException e) {
        } catch (IOException e) {
        }

    }

    public class MyResolver implements EntityResolver {
        // This method is called whenever an external entity is accessed
        // for the first time.
        public InputSource resolveEntity(String publicId, String
systemId) {
            try {
                // Wrap the systemId in a URI object to make it
convenient
                // to extract the components of the systemId
                URI uri = new URI(systemId);
               
                System.out.println("System ID: " + systemId);

                
                // Check if external source is a file
                if ("file".equals(uri.getScheme())) {
                    String filename = uri.getSchemeSpecificPart();

                    return new InputSource(new FileReader(filename));
                } else {

                }
            } catch (URISyntaxException e) {
                System.err.println(e.toString());
            } catch (IOException e) {
            }

            // Returning null causes the caller to try accessing the
systemid
            return null;
        }
    }

Thanks in advance,

Phil