XML validation using xml schema string 2003-01-22 - By Praveen Peddi
As you said I wrote an EntityResolver but it didn't work. Could you send me
a sample code (just the validation code) if u already have one.
My validate method looks as follows:
public static void validateXmlAgainstLocalSchema(String XMLString, String
schemaString) throws SAXException{
long startTime = System.currentTimeMillis();
System.out.println("Files: XML:" + XMLString + " XSD:" +
schemaString);
XMLReader parser = null;
// Instantiate a parser
try{
parser =
XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
} catch (org.xml.sax.SAXException ex){
System.out.println("SAXException Exception");
throw new SAXException("Error Obtaining the parser.");
}
try{
// Register the error handler
parser.setErrorHandler(new SchemaErrorHandler());
//parser.setFeature("http://apache.org/xml/features/continue-after-fatal-err
or", true);
// Turn on validation
parser.setFeature("http://xml.org/sax/features/namespaces",true);
parser.setFeature("http://xml.org/sax/features/validation",
true);
parser.setFeature("http://apache.org/xml/features/validation/schema",true);
parser.setFeature("http://apache.org/xml/features/validation/schema-full-che
cking",true);
//parser.setProperty("http://apache.org/xml/properties/schema/external-noNam
espaceSchemaLocation",Schema);
parser.setEntityResolver(new SchemaEntityResolver(schemaString));
} catch (org.xml.sax.SAXNotRecognizedException ex){
ex.printStackTrace();
System.out.println("SAXNotRecognizedException
Exception");
} catch (org.xml.sax.SAXNotSupportedException ex){
ex.printStackTrace();
System.out.println("SAXNotSupportedException
Exception");
}
// Parse the document
try{
//String XMLSystemId = new
File(XMLString).toURL().toExternalForm();
parser.parse(new InputSource(new StringReader(XMLString)));
//parser.parse(XMLSystemId);
System.out.println("Parsed Successfully by SAX Parser");
} catch (org.xml.sax.SAXException ex){
System.out.println("SAXException Exception");
throw new SAXException("Error Validating the content XML.");
} catch (java.io.IOException ex){
System.out.println("IOException Exception");
throw new SAXException("Error Validating the content XML.");
} finally {
long endTime = System.currentTimeMillis();
System.out.println("Total time of
SAXValidate:"+(endTime-startTime));
}
}//SAXValidate
And SchemaEntityResolver looks as follows:
public class SchemaEntityResolver implements EntityResolver {
InputSource source = null;
public SchemaEntityResolver(String schemaString) {
source = new InputSource(new StringReader(schemaString));
}
public InputSource resolveEntity(String publicID, String systemID)
throws SAXException {
return source;
}
}
When I try to validate an xml with the schema string, I get the following
error:
Line: 1
URI: null
Message: cvc-elt.1: Cannot find the declaration of element 'content'.
Am I doing it wrong? If so please tell me how to use the entityresolver.
Praveen
----- Original Message -----
From: <sandygao@(protected)>
To: <xerces-j-user@(protected)>
Sent: Monday, January 20, 2003 10:18 AM
Subject: Re: XML validation using xml schema string
> Write an entity resolver
>
(http://xml.apache.org/xerces2-j/javadocs/api/org/xml/sax/EntityResolver.htm
l),
>
> and returned an input source with a StringReader when the schema document
> is asked.
>
> HTH,
> Sandy Gao
> Software Developer, IBM Canada
> (1-905) 413-3255
> sandygao@(protected)
>
>
>
>
> "Praveen Peddi"
> <ppeddi@(protected) To:
<xerces-j-user@(protected)>
> dia.com> cc:
> Subject: Re: XML
validation using xml schema string
> 01/20/2003 09:16
> AM
> Please respond to
> xerces-j-user
>
>
>
>
>
> Hi all,
> Last week I sent an email regarding the xml validation against the schema,
> but didn't get any reply. Please reply if any one has answer to my
> question. Is it possible to validate an xml document using a schema
> document (not the schema url) that is present with in the application. If
> its not possible, whats the best way of achieving it. Please read my
> previous email below.
>
> Thanks
> Praveen
>
> Hi all,
> I want to validate an xml document with an existing schema. I know there
> is a code to do it when the schema is present as a URL. BUt in my case
> schema is present with in the application memory (since it is stored in
> the database) and that is not the url or on the hard disk.
> I have the following method which validates only when the schema is
> present externally. Note that the argument Schema is a URL:
> public static void DOMValidate(String XMLfile, String Schema){
> long startTime = System.currentTimeMillis();
>
> // Instantiate the DOM parser.
> DOMParser parser = new DOMParser();
>
> // set the features
> try{
> parser.setFeature("http://xml.org/sax/features/namespaces
> ",true);
> parser.setFeature("http://xml.org/sax/features/validation",
> true);
> parser.setFeature("
> http://apache.org/xml/features/validation/schema",true);
> parser.setFeature("
> http://apache.org/xml/features/validation/schema-full-checking",true);
> // convert the xml file name to a URL
> String SystemId = null;
> try{
> SystemId = new File(Schema).toURL().toExternalForm();
> } catch(java.net.MalformedURLException ex){
> //ex.printStackTrace();
> log.error(ex);
> }
> parser.setProperty("
>
http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation
> ",SystemId);
> // myErrorHandler is a descendant of ErrorHandler, it should
> be set here to be able to catch parse errors
> parser.setErrorHandler(new SchemaErrorHandler());
>
> } catch (SAXNotSupportedException ex){
> System.out.println("SAXNotSupportedException Exception");
> } catch (SAXNotRecognizedException ex){
> System.out.println("SAXNotRecognizedException
Exception");
> }
>
> // parse the xml file, the errorhandler class has callbacks,
> // so those will be called automatically there is a parse error
> try{
> parser.parse(new File(XMLfile).toURL().toExternalForm());
> //System.out.println("Parsed Successfully by DOM
Parser");
> } catch (org.xml.sax.SAXException ex){
> //System.out.println("SAXException Exception");
> //ex.printStackTrace();
> log.error(ex);
> } catch (java.io.IOException ex){
> System.out.println("IOException Exception");
> } finally {
> long endTime = System.currentTimeMillis();
> //System.out.println("Total time of DOMValidate:"
> +(endTime-startTime));
>
> }
>
> }
>
> How can I do the validation if the Schema is the actual schema string not
> the url. This looks like a common problem. I assume that its not
universal
> that schema is not always stored externally.
>
> Any suggestions are appreciated.
>
> Praveen
>
>
>
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