/*
    *
    * 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 java.util.HashMap;
  import java.util.Map;
  
  /**
   * Decorator that replace configured values from the decorated dataset
   * with replacement values.
   *
   * @author Manuel Laflamme
   * @since Mar 17, 2003
   * @version $Revision: 855 $
   */
  public class ReplacementDataSet extends AbstractDataSet
  {
  
      /**
       * Logger for this class
       */
      private static final Logger logger = LoggerFactory.getLogger(ReplacementDataSet.class);
  
      private final IDataSet _dataSet;
      private final Map _objectMap;
      private final Map _substringMap;
      private String _startDelim;
      private String _endDelim;
      private boolean _strictReplacement;
  
  
      /**
       * Create a new ReplacementDataSet object that decorates the specified dataset.
       *
       * @param dataSet the decorated table
       */
      public ReplacementDataSet(IDataSet dataSet)
      {
          _dataSet = dataSet;
          _objectMap = new HashMap();
          _substringMap = new HashMap();
      }
  
      /**
       * Create a new ReplacementDataSet object that decorates the specified dataset.
       *
       * @param dataSet the decorated dataset
       * @param objectMap the replacement objects mapping
       * @param substringMap the replacement substrings mapping
       */
      public ReplacementDataSet(IDataSet dataSet, Map objectMap, Map substringMap)
      {
          _dataSet = dataSet;
          _objectMap = objectMap == null ? new HashMap() : objectMap;
          _substringMap = substringMap == null ? new HashMap() : substringMap;
      }
  
      /**
       * Setting this property to true indicates that when no replacement
       * is found for a delimited substring the replacement will fail fast.
       * 
       * @param strictReplacement true if replacement should be strict
       */
      public void setStrictReplacement(boolean strictReplacement) {
          this._strictReplacement = strictReplacement;
      }
      
      /**
       * Add a new Object replacement mapping.
       *
       * @param originalObject the object to replace
       * @param replacementObject the replacement object
       */
      public void addReplacementObject(Object originalObject, Object replacementObject)
      {
          logger.debug("addReplacementObject(originalObject={}, replacementObject={}) - start", originalObject, replacementObject);
  
          _objectMap.put(originalObject, replacementObject);
     }
 
     /**
      * Add a new substring replacement mapping.
      *
      * @param originalSubstring the substring to replace
      * @param replacementSubstring the replacement substring
      */
     public void addReplacementSubstring(String originalSubstring,
             String replacementSubstring)
     {
         logger.debug("addReplacementSubstring(originalSubstring={}, replacementSubstring={}) - start", originalSubstring, replacementSubstring);
 
         if (originalSubstring == null || replacementSubstring == null)
         {
             throw new NullPointerException();
         }
 
         _substringMap.put(originalSubstring, replacementSubstring);
     }
 
     /**
      * Sets substring delimiters.
      */
     public void setSubstringDelimiters(String startDelimiter, String endDelimiter)
     {
         logger.debug("setSubstringDelimiters(startDelimiter={}, endDelimiter={}) - start", startDelimiter, endDelimiter);
 
         if (startDelimiter == null || endDelimiter == null)
         {
             throw new NullPointerException();
         }
 
         _startDelim = startDelimiter;
         _endDelim = endDelimiter;
     }
 
     private ReplacementTable createReplacementTable(ITable table)
     {
         logger.debug("createReplacementTable(table={}) - start", table);
         
         ReplacementTable replacementTable = new ReplacementTable(
                 table, _objectMap, _substringMap, _startDelim, _endDelim);
         replacementTable.setStrictReplacement(_strictReplacement);
         return replacementTable;
     }
 
     ////////////////////////////////////////////////////////////////////////////
     // AbstractDataSet class
 
     protected ITableIterator createIterator(boolean reversed)
             throws DataSetException
     {
     	if(logger.isDebugEnabled())
     		logger.debug("createIterator(reversed={}) - start", String.valueOf(reversed));
 
         return new ReplacementIterator(reversed ?
                 _dataSet.reverseIterator() : _dataSet.iterator());
     }
 
     ////////////////////////////////////////////////////////////////////////////
     // IDataSet interface
 
     public String[] getTableNames() throws DataSetException
     {
         logger.debug("getTableNames() - start");
 
         return _dataSet.getTableNames();
     }
 
     public ITableMetaData getTableMetaData(String tableName)
             throws DataSetException
     {
         logger.debug("getTableMetaData(tableName={}) - start", tableName);
 
         return _dataSet.getTableMetaData(tableName);
     }
 
     public ITable getTable(String tableName) throws DataSetException
     {
         logger.debug("getTable(tableName={}) - start", tableName);
 
         return createReplacementTable(_dataSet.getTable(tableName));
     }
 
     ////////////////////////////////////////////////////////////////////////////
     // ReplacementIterator class
 
     private class ReplacementIterator implements ITableIterator
     {
 
         /**
          * Logger for this class
          */
         private final Logger logger = LoggerFactory.getLogger(ReplacementIterator.class);
 
         private final ITableIterator _iterator;
 
         public ReplacementIterator(ITableIterator iterator)
         {
             _iterator = iterator;
         }
 
         ////////////////////////////////////////////////////////////////////////
         // ITableIterator interface
 
         public boolean next() throws DataSetException
         {
             logger.debug("next() - start");
 
             return _iterator.next();
         }
 
         public ITableMetaData getTableMetaData() throws DataSetException
         {
             logger.debug("getTableMetaData() - start");
 
             return _iterator.getTableMetaData();
         }
 
         public ITable getTable() throws DataSetException
         {
             logger.debug("getTable() - start");
 
             return createReplacementTable(_iterator.getTable());
         }
     }
 }