code: package it.unibz.inf.ontop.protege.core;
  
  /*
   * #%L
   * ontop-obdalib-core
   * %%
   * Copyright (C) 2009 - 2014 Free University of Bozen-Bolzano
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import it.unibz.inf.ontop.shaded.com.google.common.collect.ImmutableMap;
  import it.unibz.inf.ontop.exception.MappingIOException;
  import it.unibz.inf.ontop.injection.OntopSQLCoreSettings;
  import it.unibz.inf.ontop.injection.OntopSQLCredentialSettings;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.*;
  import java.util.Optional;
  import java.util.Properties;
  
  /**
   * Refer to the Ontop Native Mapping Language for SQL, get DataSource information from the file
   * and return a Reader with the mapping information without the SourceDeclaration
   *
   */
  public class OldSyntaxMappingConverter {
  
      private static final Logger LOG = LoggerFactory.getLogger(OldSyntaxMappingConverter.class);
  
      private static final ImmutableMap<String, String> PARAMETER_MAP = ImmutableMap.of(
              "connectionUrl", OntopSQLCoreSettings.JDBC_URL,
              "username", OntopSQLCredentialSettings.JDBC_USER,
              "password", OntopSQLCredentialSettings.JDBC_PASSWORD,
              "driverClass", OntopSQLCredentialSettings.JDBC_DRIVER);
  
      protected static final String SOURCE_DECLARATION_TAG = "[SourceDeclaration]";
  
      private Properties dataSourceProperties;
      private final String restOfFile;
  
  
      /**
       *  Read the old-style obda mapping file and extract the data source information
       */
  
      public OldSyntaxMappingConverter(Reader fileReader, String fileName) throws MappingIOException {
          restOfFile = extractSourceDeclaration(fileReader, fileName);
      }
  
      //return the extracted obda data source
  
      public Optional<Properties> getDataSourceProperties()  {
          return Optional.ofNullable(dataSourceProperties);
      }
  
      public String getRestOfFile() {
          return restOfFile;
      }
  
  
  	private String extractSourceDeclaration(Reader reader, String fileName) throws MappingIOException {
          // no need in auto-closing - it's closed by the caller
          LineNumberReader lineNumberReader = new LineNumberReader(reader);
          try {
              StringBuilder sb = new StringBuilder();
              String line;
              while ((line = lineNumberReader.readLine()) != null) {
                  if (line.contains(SOURCE_DECLARATION_TAG)) {
                      LOG.warn("Old Syntax in the OBDA file, the datasource declaration will be removed from the mapping file.");
                      dataSourceProperties = readSourceDeclaration(lineNumberReader);
                  }
                  else {
                      sb.append(line).append(System.lineSeparator());
                  }
              }
              return sb.toString();
          }
          catch (Exception e) {
              throw new MappingIOException(
                      new IOException(String.format("ERROR reading %s at line: %s", fileName,
                              lineNumberReader.getLineNumber()
                                      + " \nMESSAGE: " + e.getMessage()), e));
          }
  	}
  
      private static Properties readSourceDeclaration(LineNumberReader reader) throws IOException {
          Properties dataSourceProperties  = new Properties();
  
          String line;
          while (!(line = reader.readLine()).isEmpty()) {
              String[] tokens = line.split("[\t| ]+", 2);
  
              String parameterName = tokens[0].trim();
              String inputParameter = tokens[1].trim();
  
              if (!parameterName.equals("jdbc.name")) {
  
                  String ontopParameterName = Optional.ofNullable(PARAMETER_MAP.get(parameterName))
                          .orElseThrow(() -> new IOException(String.format(
                                  "Unknown parameter name \"%s\" at line: %d.", parameterName, reader.getLineNumber())));
  
                  dataSourceProperties.put(ontopParameterName, inputParameter);
              }
          }
          return dataSourceProperties;
      }
  }
  