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Demo

CommaSeparatedField.java

package edu.virtualschool.jwaa.field;

import java.util.ArrayList;
import java.util.Iterator;

import org.apache.log4j.Logger;

public final class CommaSeparatedField extends GenericField
{
  public final ArrayList arrayValue;

  public final static String sqlType = "varchar(255)";
  public final static CommaSeparatedField Null =
    new CommaSeparatedField(null, "");
  final static Logger logger =
    Logger.getLogger(CommaSeparatedField.class.getName());

  public CommaSeparatedField(Object value)
  {
    this(value, "");
  }
  public CommaSeparatedField(Object value, Object defaultValue) 
  {
    super(value, defaultValue);
    arrayValue = unpack(stringValue);
  }
  public CommaSeparatedField(ArrayList arrayValue)
  {
    super(pack(arrayValue), "");
    this.arrayValue = arrayValue;
  }
  public ArrayList getArrayValue()
  {
    return arrayValue;
  }
  public static String pack(ArrayList arrayValue)
  {
    StringBuffer buf = new StringBuffer();
    for (Iterator iterator = arrayValue.iterator(); iterator.hasNext();)
    {
      final String string = (String) iterator.next();
      final int len = string.length();
      for (int j = 0; j < len; j++)
      {
        int c = string.charAt(j);
        // double internal comma signs
        if (c == ',' && (j < len - 1))
          buf.append(",,");
        else
          buf.append((char) c);
      }
      if (iterator.hasNext())
        buf.append((char) ',');
    }
    return buf.toString();
  }
  public static ArrayList unpack(String value)
  {
    ArrayList array = new ArrayList();
    if (value == null)
      return array;
    StringBuffer s = new StringBuffer();
    for (int i = 0; i < value.length(); i++)
    {
      int c = value.charAt(i);
      if (c == ',')
      {
        c = value.charAt(++i);
        if (c == ',')
          s.append(",");
        else
        {
          array.add(s.toString());
          s.setLength(0);
          s.append((char) c);
        }
      }
      else
      {
        s.append((char) c);
      }
    }
    array.add(s.toString());
    return array;
  }
  public static CommaSeparatedField createFromArray(Object[] array)
  {
    ArrayList list = new ArrayList(array.length);
    for (int i = 0; i < array.length; i++)
      list.add(array[i]);
    return new CommaSeparatedField(list);
  }
}