package org.kuali.ole.ingest;
   
   import org.apache.commons.io.IOUtils;
   import org.kuali.ole.exception.ParseException;
   import org.kuali.ole.exception.XmlErrorHandler;
   import org.xml.sax.SAXException;
   
   import javax.xml.XMLConstants;
   import javax.xml.transform.Source;
  import javax.xml.transform.stream.StreamSource;
  import javax.xml.validation.Schema;
  import javax.xml.validation.SchemaFactory;
  import javax.xml.validation.Validator;
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   *  KrmsXMLSchemaValidator is used to validate the xsd schema for KRMS builder.
   */
  public class KrmsXMLSchemaValidator {
  
      private static final String KRMS_SCHEMA_FILE = "license.xsd";
  
      /**
       *  This method return True/False.
       *  This method checks fileContent schema with W3 Xml schema standards,If it matches it return True else return False.
       * @param inputStream
       * @return  boolean
       * @throws org.kuali.ole.exception.ParseException
       * @throws java.io.IOException
       * @throws org.xml.sax.SAXException
       */
      public boolean validateContentsAgainstSchema(InputStream inputStream)
              throws ParseException, IOException, SAXException {
          try {
                  SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
                  Source schemaSource = null;
                  schemaSource = new StreamSource(getFileContents());
                  Schema schema = null;
                  schema = factory.newSchema(schemaSource);
                  Validator validator = schema.newValidator();
                  validator.setErrorHandler(new XmlErrorHandler());
                  validator.validate(new StreamSource(inputStream));
                  return true;
          }
          catch(Exception ex){
             //TODO: logging required
          }
          return false;
      }
  
      /**
       *  This method will return fileContents based on KRMS Schema File
       * @return  profileXmlFile.
       */
      private InputStream getFileContents(){
          byte[] profileByteArray;
          ByteArrayInputStream profileXmlFile=null;
          try{
                  profileByteArray = IOUtils.toByteArray(getClass().getResourceAsStream(KRMS_SCHEMA_FILE));
                  profileXmlFile = new ByteArrayInputStream(profileByteArray);
          }
          catch(Exception e){
            //TODO: logging required
          }
          return profileXmlFile;
      }
  }