package org.apache.torque.generator.configuration.source;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  
  import static org.apache.torque.generator.configuration.source.SourceConfigurationTags.DRIVER_OPTION_ATTRIBUTE;
  import static org.apache.torque.generator.configuration.source.SourceConfigurationTags.PASSWORD_OPTION_ATTRIBUTE;
  import static org.apache.torque.generator.configuration.source.SourceConfigurationTags.SCHEMA_OPTION_ATTRIBUTE;
  import static org.apache.torque.generator.configuration.source.SourceConfigurationTags.SOURCE_TAG;
  import static org.apache.torque.generator.configuration.source.SourceConfigurationTags.URL_OPTION_ATTRIBUTE;
  import static org.apache.torque.generator.configuration.source.SourceConfigurationTags.USERNAME_OPTION_ATTRIBUTE;
  
  import org.apache.torque.generator.configuration.ConfigurationException;
  import org.apache.torque.generator.configuration.ConfigurationHandlers;
  import org.apache.torque.generator.configuration.ConfigurationProvider;
  import org.apache.torque.generator.configuration.paths.ProjectPaths;
  import org.apache.torque.generator.source.SourceProvider;
  import org.apache.torque.generator.source.jdbc.JdbcMetadataSourceProvider;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  
  /**
   * Reads jdbc metadata source definitions from the controller configuration
   * file.
   */
  public class JdbcMetadataSourceSaxHandler extends SourceSaxHandler
  {
      /**
       * The source provider which is configured by this SAX handler.
       */
      private SourceProvider sourceProvider;
  
      /**
       * Constructor.
       *
       * @param configurationProvider The access object for the configuration
       *        files, not null.
       * @param projectPaths The paths of the surrounding project, not null.
       * @param configurationHandlers All known configuration handlers, not null.
       *
       * @throws NullPointerException if an argument is null.
       */
      public JdbcMetadataSourceSaxHandler(
              ConfigurationProvider configurationProvider,
              ProjectPaths projectPaths,
              ConfigurationHandlers configurationHandlers)
      {
          super(configurationProvider, projectPaths, configurationHandlers);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void startElement(String uri, String localName, String rawName,
                               Attributes attributes)
              throws SAXException
      {
          if (rawName.equals(SOURCE_TAG))
          {
              String urlOption
                      = attributes.getValue(URL_OPTION_ATTRIBUTE);
              String driverOption
                      = attributes.getValue(DRIVER_OPTION_ATTRIBUTE);
              String usernameOption
                      = attributes.getValue(USERNAME_OPTION_ATTRIBUTE);
              String passwordOption
                      = attributes.getValue(PASSWORD_OPTION_ATTRIBUTE);
              String schemaOption
                      = attributes.getValue(SCHEMA_OPTION_ATTRIBUTE);
              try
              {
                  sourceProvider = new JdbcMetadataSourceProvider(
                          urlOption,
                          driverOption,
                          usernameOption,
                          passwordOption,
                          schemaOption);
              }
              catch (ConfigurationException e)
              {
                  throw new SAXException(
                          "Could not parse Source Tag: " + e.getMessage(),
                         e);
             }
         }
         super.startElement(uri, localName, rawName, attributes);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void endElement(String uri, String localName, String rawName)
         throws SAXException
     {
         super.endElement(uri, localName, rawName);
         if (rawName.equals(SOURCE_TAG))
         {
             finished();
         }
     }
 
     /**
      * Returns the configuration filled with the contents of the parsed snippet.
      *
      * @return the configuration which was filled, not null if a
      *         matching snippet was processed.
      */
     public SourceProvider getSourceProvider()
     {
         return sourceProvider;
     }
 }