package org.apache.ojb.broker.accesslayer.conversions;

 /* Copyright 2004-2005 The Apache Software Foundation

  *

  * 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.

  */

 import java.util.ArrayList;

 import java.util.List;

 import org.apache.commons.lang.StringUtils;

 /**

  * This implementation of the {@link FieldConversion} interface converts

  * between a {@link java.util.List} of {@link java.lang.Integer} objects and a database

  * <em>varchar</em> field.

  *

  * @author Guillaume Nodet

  * @version $Id: IntList2VarcharFieldConversion.java,v 1.1 2007-08-24 22:17:31 ewestfal Exp $

  */

 public class IntList2VarcharFieldConversion implements FieldConversion

 {

     private static final String NULLVALUE = "#NULL#";

     private static final String EMPTYCOLLEC = "#EMTPY#";

     public IntList2VarcharFieldConversion()

     {

     }

     /* (non-Javadoc)

      * @see org.apache.ojb.broker.accesslayer.conversions.FieldConversion#javaToSql(java.lang.Object)

      */

     public Object javaToSql(Object source) throws ConversionException

     {

         if (source == null)

         {

             return NULLVALUE;

         }

         try

         {

             List intList = (List) source;

             if (intList.isEmpty())

             {

                 return EMPTYCOLLEC;

             }

             StringBuffer result = new StringBuffer();

             for (int i = 0; i < intList.size(); i++)

             {

                 Integer obj = (Integer) intList.get(i);

                 String newSt = obj.toString();

                 newSt = StringUtils.replace(newSt, "#", "##");

                 result.append(newSt);

                 result.append("#");

             }

             return result.toString();

         }

         catch (ClassCastException e)

         {

             throw new ConversionException("Object is not a List of Integer it is a"

                     + source.getClass().getName());

         }

     }

     /* (non-Javadoc)

      * @see org.apache.ojb.broker.accesslayer.conversions.FieldConversion#sqlToJava(java.lang.Object)

      */

     public Object sqlToJava(Object source) throws ConversionException

     {

         if (source == null)

         {

             return null;

         }

         if (!(source instanceof String))

         {

             throw new ConversionException("Object is not a String it is a"

                     + source.getClass().getName());

         }

         if (source.toString().equals(NULLVALUE))

         {

             return null;

         }

         if (source.toString().equals(EMPTYCOLLEC))

         {

             return new ArrayList();

         }

         List v = new ArrayList();

         String input = source.toString();

         int pos = input.indexOf("#");

         while (pos >= 0)

         {

             if (pos == 0)

             {

                 v.add("");

             }

             else

             {

                 v.add(Integer.valueOf(input.substring(0, pos)));

             }

             if (pos + 1 > input.length())

             {

                 //# at end causes outof bounds

                 break;

             }

             input = input.substring(pos + 1, input.length());

             pos = input.indexOf("#");

         }

         return v;

     }

 }