package net.sf.layoutParser.util.xml.validation;
   
   import java.io.IOException;
   
   import javax.xml.parsers.ParserConfigurationException;
   import javax.xml.parsers.SAXParser;
   import javax.xml.parsers.SAXParserFactory;
   
   import net.sf.layoutParser.build.BuilderException;
  import net.sf.layoutParser.exception.ExceptionKey;
  
  import org.xml.sax.SAXException;
  import org.xml.sax.SAXParseException;
  import org.xml.sax.helpers.DefaultHandler;
  
  /**
   * TODO: Comentar esta classe
   * 
   * @author Mário Valentim Junior
   * @since 1.1
   * @date 11/06/2008
   */
  public abstract class XsdChecker {
  	/**
  	 * "http://www.w3.org/2001/XMLSchema"
  	 */
  	public static final String XMLSCHEMA = "http://www.w3.org/2001/XMLSchema";
  	
  	/**
  	 * "http://java.sun.com/xml/jaxp/properties/schemaLanguage"
  	 */
  	public static final String SCHEMA_LANGUAGE = "http://java.sun.com/xml/jaxp/properties/schemaLanguage";
  	
  	/**
  	 * @param arquivo
  	 * @throws BuilderException
  	 */
  	public static void checkLayout(String fileName, String xsdFileName) throws BuilderException {
  		SAXParser saxParser = null;
  		
  		try {
  			SAXParserFactory f = SAXParserFactory.newInstance();
  			f.setNamespaceAware(true);
  			f.setValidating(true);
  			
  			saxParser = f.newSAXParser();
  			saxParser.setProperty( SCHEMA_LANGUAGE, XMLSCHEMA);
  			saxParser.setProperty(
  					"http://apache.org/xml/properties/schema/external-schemaLocation",
  					" http://layoutparser.sourceforge.net/ " + Thread.currentThread().getContextClassLoader().getResource(xsdFileName).toExternalForm());
  			
  			saxParser.parse(Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName), new LayoutErrorHandler());
  		} catch (SAXException e) {
  			throw new BuilderException(ExceptionKey.SCHEMA_CHECK, new Object[]{fileName}, e);
  		} catch (IOException e) {
  			throw new BuilderException(ExceptionKey.FILE_NOT_FOUND, new Object[]{fileName}, e);
  		} catch (ParserConfigurationException e) {
  			throw new BuilderException(e);
  		}
  	}
  
  	/**
  	 * TODO: Comentar esta classe
  	 *
  	 * @author Mário Valentim Junior
  	 * @since 1.1
  	 * @date 11/06/2008
  	 */
  	private static class LayoutErrorHandler extends DefaultHandler {
  		public void warning(SAXParseException e) throws SAXException {
  			System.out.println("Warning: ");
  			printInfo(e);
  		}
  
  		public void error(SAXParseException e) throws SAXException {
  			throw e;
  		}
  
  		public void fatalError(SAXParseException e) throws SAXException {
  			throw e;
  		}
  
  		private void printInfo(SAXParseException e) {
  			System.out.println("   Public ID: " + e.getPublicId());
  			System.out.println("   System ID: " + e.getSystemId());
  			System.out.println("   Line number: " + e.getLineNumber());
  			System.out.println("   Column number: " + e.getColumnNumber());
  			System.out.println("   Message: " + e.getMessage());
  		}
  	}
  }