/*
    *
    * The DbUnit Database Testing Framework
    * Copyright (C)2002-2004, DbUnit.org
    *
    * This library is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public
    * License as published by the Free Software Foundation; either
    * version 2.1 of the License, or (at your option) any later version.
   *
   * This library 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.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   *
   */
  
  package org.dbunit.dataset;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.dbunit.dataset.filter.IColumnFilter;
  
  import java.util.List;
  import java.util.ArrayList;
  
  /**
   * @author Manuel Laflamme
   * @version $Revision$
   * @since May 11, 2004
   */
  public class FilteredTableMetaData extends AbstractTableMetaData
  {
  
      /**
       * Logger for this class
       */
      private static final Logger logger = LoggerFactory.getLogger(FilteredTableMetaData.class);
  
      private final String _tableName;
      private final Column[] _columns;
      private final Column[] _primaryKeys;
  
      public FilteredTableMetaData(ITableMetaData metaData,
              IColumnFilter columnFilter) throws DataSetException
      {
          _tableName = metaData.getTableName();
          _columns = getFilteredColumns(_tableName, metaData.getColumns(), columnFilter);
          _primaryKeys = getFilteredColumns(_tableName, metaData.getPrimaryKeys(), columnFilter);
      }
  
      public static Column[] getFilteredColumns(String tableName,
              Column[] columns, IColumnFilter columnFilter)
      {
      	if (logger.isDebugEnabled())
      	{
      		logger.debug("getFilteredColumns(tableName={}, columns={}, columnFilter={}) - start",
      				new Object[]{ tableName, columns, columnFilter });
      	}
  
          if (columns == null)
          {
              return new Column[0];
          }
          
          List columnList =  new ArrayList();
          for (int i = 0; i < columns.length; i++)
          {
              Column column = columns[i];
              if (columnFilter.accept(tableName, column))
              {
                  columnList.add(column);
              }
          }
          return (Column[])columnList.toArray(new Column[0]);
      }
  
      ////////////////////////////////////////////////////////////////////////////
      // ITableMetaData interface
  
      public String getTableName()
      {
          return _tableName;
      }
  
      public Column[] getColumns() throws DataSetException
      {
          return _columns;
      }
  
      public Column[] getPrimaryKeys() throws DataSetException
      {
          return _primaryKeys;
      }
 }