/***************************************
 *                                     *
 *  JBoss: The OpenSource J2EE WebOS   *
 *                                     *
 *  Distributable under LGPL license.  *
 *  See terms of license at gnu.org.   *
 *                                     *
 ***************************************/

package org.jboss.util.propertyeditor;

import java.util.ArrayList;
import java.util.StringTokenizer;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.beans.PropertyEditorSupport;

/**
 * A property editor for String[]. The text format of a string array is a
 * comma or \n, \r seperated list with \, representing an escaped comma to
 * include in the string element.
 *
 * @version <tt>$Revision: 1.6.6.1 $</tt>
 * @author  <a href="mailto:jason@planet57.com">Jason Dillon</a>
 * @author Scott.Stark@jboss.org
 */
public class StringArrayEditor
   extends PropertyEditorSupport
{
   Pattern commaDelim = Pattern.compile("','|[^,\r\n]+");

   static String[] parseList(String text)
   {
      ArrayList list = new ArrayList();
      StringBuffer tmp = new StringBuffer();
      for(int n = 0; n < text.length(); n ++)
      {
         char c = text.charAt(n);
         switch( c)
         {
            case '\\':
               tmp.append(c);
               if( n < text.length() && text.charAt(n+1) == ',' )
               {
                  tmp.setCharAt(tmp.length()-1, ',');
                  n ++;
               }               
               break;
            case ',':
            case '\n':
            case '\r':
               if( tmp.length() > 0 )
                  list.add(tmp.toString());
               tmp.setLength(0);
               break;
            default:
               tmp.append(c);
               break;
         }
      }
      if( tmp.length() > 0 )
         list.add(tmp.toString());

      String[] x = new String[list.size()];
      list.toArray(x);
      return x;
   }

   /** Build a String[] from comma or eol seperated elements with a \,
    * representing a ',' to include in the current string element.
    *
    */
   public void setAsText(final String text)
   {
      String[] theValue = parseList(text);
      setValue(theValue);
   }

   /**
    * @return a comma seperated string of the array elements
    */
   public String getAsText()
   {
      String[] theValue = (String[]) getValue();
      StringBuffer text = new StringBuffer();
      int length = theValue == null ? 0 : theValue.length;
      for(int n = 0; n < length; n ++)
      {
         String s = theValue[n];
         if( s.equals(",") )
            text.append('\\');
         text.append(s);
         text.append(',');
      }
      // Remove the trailing ','
      if( text.length() > 0 )
         text.setLength(text.length()-1);
      return text.toString();
   }
}