/*
    * 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.
   */
  
  package org.apache.log4j.db;
  
  
  import org.apache.log4j.xml.DOMConfigurator;
  import org.apache.log4j.xml.UnrecognizedElementHandler;
  import org.w3c.dom.Element;
  
  import javax.sql.DataSource;
  import java.sql.Connection;
  import java.sql.SQLException;
  import java.util.Properties;
  
  
  /**
   * The DataSourceConnectionSource is an implementation of {@link ConnectionSource}
   * that obtains the Connection in the recommended JDBC manner based on
   * a {@link javax.sql.DataSource DataSource}.
   * <p>
   *
   * @author Ray DeCampo
   * @author Ceki G&uuml;lc&uuml;
   */
  public class DataSourceConnectionSource extends ConnectionSourceSkeleton
      implements UnrecognizedElementHandler {
  
      private DataSource dataSource;
  
  
      public void activateOptions() {
          //LogLog.debug("**********DataSourceConnectionSource.activateOptions called");
          if (dataSource == null) {
              getLogger().warn("WARNING: No data source specified");
          } else {
              Connection connection = null;
              try {
                  connection = getConnection();
              } catch (SQLException se) {
                  getLogger().warn("Could not get a connection to discover the dialect to use.", se);
              }
              if (connection != null) {
                  discoverConnnectionProperties();
              }
              if (!supportsGetGeneratedKeys() && getSQLDialectCode() == ConnectionSource.UNKNOWN_DIALECT) {
                  getLogger().warn("Connection does not support GetGeneratedKey method and could not discover the dialect.");
              }
          }
      }
  
      /**
       * @see org.apache.log4j.db.ConnectionSource#getConnection()
       */
      public Connection getConnection() throws SQLException {
          if (dataSource == null) {
              getLogger().error("WARNING: No data source specified");
              return null;
          }
  
          if (getUser() == null) {
              return dataSource.getConnection();
          } else {
              return dataSource.getConnection(getUser(), getPassword());
          }
      }
  
      public DataSource getDataSource() {
          return dataSource;
      }
  
      public void setDataSource(DataSource dataSource) {
          this.dataSource = dataSource;
      }
  
      /**
       * {@inheritDoc}
       */
      public boolean parseUnrecognizedElement(Element element, Properties props) throws Exception {
          if ("dataSource".equals(element.getNodeName())) {
              Object instance =
                  DOMConfigurator.parseElement(element, props, DataSource.class);
              if (instance instanceof DataSource) {
                  setDataSource((DataSource) instance);
              }
             return true;
         }
         return false;
     }
 
 }