/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * Copyright (c) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors..  All rights reserved.
 */

package org.pentaho.reporting.engine.classic.core.modules.parser.extwriter.sql;

import org.pentaho.reporting.engine.classic.core.ClassicEngineBoot;
import org.pentaho.reporting.engine.classic.core.DataFactory;
import org.pentaho.reporting.engine.classic.core.modules.misc.datafactory.sql.ConnectionProvider;
import org.pentaho.reporting.engine.classic.core.modules.misc.datafactory.sql.SQLReportDataFactory;
import org.pentaho.reporting.engine.classic.core.modules.misc.datafactory.sql.SimpleSQLReportDataFactory;
import org.pentaho.reporting.engine.classic.core.modules.parser.data.sql.SQLDataFactoryModule;
import org.pentaho.reporting.engine.classic.core.modules.parser.extwriter.DataFactoryWriteHandler;
import org.pentaho.reporting.engine.classic.core.modules.parser.extwriter.ReportWriterContext;
import org.pentaho.reporting.engine.classic.core.modules.parser.extwriter.ReportWriterException;
import org.pentaho.reporting.libraries.base.config.Configuration;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.xmlns.common.AttributeList;
import org.pentaho.reporting.libraries.xmlns.writer.XmlWriter;
import org.pentaho.reporting.libraries.xmlns.writer.XmlWriterSupport;

import java.io.IOException;

/**
 * Creation-Date: Jan 19, 2007, 4:44:05 PM
 *
 * @author Thomas Morgner
 */
public class DirectSQLDataFactoryWriteHandler implements DataFactoryWriteHandler {
  public static final String PREFIX =
      "org.pentaho.reporting.engine.classic.core.modules.parser.extwriter.handler.sql-connection-provider.";

  public DirectSQLDataFactoryWriteHandler() {
  }

  /**
   * Writes a data-source into a XML-stream.
   *
   * @param reportWriter
   *          the writer context that holds all factories.
   * @param xmlWriter
   *          the XML writer that will receive the generated XML data.
   * @param dataFactory
   *          the data factory that should be written.
   * @throws IOException
   *           if any error occured
   * @throws ReportWriterException
   *           if the data factory cannot be written.
   */
  public void write( final ReportWriterContext reportWriter, final XmlWriter xmlWriter, final DataFactory dataFactory )
    throws IOException, ReportWriterException {
    if ( reportWriter == null ) {
      throw new NullPointerException();
    }
    if ( dataFactory == null ) {
      throw new NullPointerException();
    }
    if ( xmlWriter == null ) {
      throw new NullPointerException();
    }

    final SimpleSQLReportDataFactory sqlDataFactory = (SimpleSQLReportDataFactory) dataFactory;

    final AttributeList rootAttrs = new AttributeList();
    if ( xmlWriter.isNamespaceDefined( SQLDataFactoryModule.NAMESPACE ) == false ) {
      rootAttrs.addNamespaceDeclaration( "data", SQLDataFactoryModule.NAMESPACE );
    }
    xmlWriter.writeTag( SQLDataFactoryModule.NAMESPACE, "direct-sql-datasource", rootAttrs, XmlWriterSupport.OPEN );

    writeConnectionInfo( reportWriter, xmlWriter, sqlDataFactory.getConnectionProvider() );

    xmlWriter.writeCloseTag();
  }

  private void writeConnectionInfo( final ReportWriterContext reportWriter, final XmlWriter xmlWriter,
      final ConnectionProvider connectionProvider ) throws IOException, ReportWriterException {
    final String configKey = DirectSQLDataFactoryWriteHandler.PREFIX + connectionProvider.getClass().getName();
    final Configuration globalConfig = ClassicEngineBoot.getInstance().getGlobalConfig();
    final String value = globalConfig.getConfigProperty( configKey );
    if ( value != null ) {
      final ConnectionProviderWriteHandler handler =
          (ConnectionProviderWriteHandler) ObjectUtilities.loadAndInstantiate( value, SQLReportDataFactory.class,
              ConnectionProviderWriteHandler.class );
      if ( handler != null ) {
        handler.write( reportWriter, xmlWriter, connectionProvider );
      }
    }

  }
}