/**
 * Copyright 2007-2012 Arthur Blake
 *
 * Licensed 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 net.sf.log4jdbc;

import java.util.Date;
import java.text.SimpleDateFormat;

/**
 * Encapsulate sql formatting details about a particular relational database management system so that
 * accurate, useable SQL can be composed for that RDMBS.
 *
 * @author Arthur Blake
 */
class RdbmsSpecifics
{
  /**
   * Default constructor.
   */
  RdbmsSpecifics()
  {
  }

  protected static final String dateFormat = "MM/dd/yyyy HH:mm:ss.SSS";

  /**
   * Format an Object that is being bound to a PreparedStatement parameter, for display. The goal is to reformat the
   * object in a format that can be re-run against the native SQL client of the particular Rdbms being used.  This
   * class should be extended to provide formatting instances that format objects correctly for different RDBMS
   * types.
   *
   * @param object jdbc object to be formatted.
   * @return formatted dump of the object.
   */
  String formatParameterObject(Object object)
  {
    if (object == null)
    {
      return "NULL";
    }
    else
    {
      if (object instanceof String)
      {
        return "'" + escapeString((String)object) + "'";
      }
      else if (object instanceof Date)
      {
        return "'" + new SimpleDateFormat(dateFormat).format(object) + "'";
      }
      else if (object instanceof Boolean)
      {
        return DriverSpy.DumpBooleanAsTrueFalse?
            ((Boolean)object).booleanValue()?"true":"false"
            :((Boolean)object).booleanValue()?"1":"0";
      }
      else
      {
        return object.toString();
      }
    }
  }

  /**
   * Make sure string is escaped properly so that it will run in a SQL query analyzer tool.
   * At this time all we do is double any single tick marks.
   * Do not call this with a null string or else an exception will occur.
   *
   * @return the input String, escaped.
   */
  String escapeString(String in)
  {
    StringBuilder out = new StringBuilder();
    for (int i=0, j=in.length(); i < j; i++)
    {
      char c = in.charAt(i); 
      if (c == '\'')
      {
        out.append(c);
      }
      out.append(c);
    }
    return out.toString();
  }

}