Validating schema of my XSD wth GML with GeoTools

Question

I would like to control if my GML file is valid with my actual XSD using GeoTools.

I found something here: GML2 Parsing TestSchema Example. But I don't know if it's a good way to do what I want.

Configuration configuration = new org.geotools.gml3.GMLConfiguration();
Parser parser = new org.geotools.xsd.Parser(configuration);

//the xml instance document above
ClassLoader classloader = Thread.currentThread().getContextClassLoader();
InputStream xsd = classloader.getResourceAsStream("gml/config.xsd");

int i =0;
//parse
SimpleFeatureCollection fc = (SimpleFeatureCollection) parser.parse(xsd);
fc.accepts( new AbstractFeatureVisitor(){
    public void visit( Feature feature ) {
        SimpleFeature f = (Feature) i.next();

        Point point = (Point) f.getDefaultGeometry();
        String name = (String) f.getAttribute( "name" );
    }
}, new NullProgressListener() );

In my code I don't know where I can specify my GML file for validation.

Answer 1

You don't need to use a GML aware parser to check for validity a normal Java XML Validator will do. So something like:

  public boolean validate(File gml, URL schemaURL) {
    Source xmlFile = new StreamSource(gml);
    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    try {
      Schema schema = schemaFactory.newSchema(schemaURL);
      Validator validator = schema.newValidator();
      validator.validate(xmlFile);
      System.out.println(xmlFile.getSystemId() + " is valid");
      return true;
    } catch (SAXException e) {
      System.out.println(xmlFile.getSystemId() + " is NOT valid reason:" + e);
    } catch (IOException e) {
    }
    return false;
  }