Re: [Sax-devel] Resolve all entities

[David M. <dav...@gm...>]

2008/4/24 Vallone, Philip Mr CTR USA AMC <Phi...@us...>:

>  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.

It looks to me like a bug int he parser you're using.  Your entity
resolver should be invoked for all references, including the parameter
entity reference %commonEntities;.  Have you tried adding a print
statement outside the if block, to see if for some reason it's not
coming in with a file: scheme?

>
>  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;
>         }
>     }


All the best,


David