package lava.net.common;

import java.util.Enumeration;
import java.util.Vector;

/**
 *
 **/
public class VariableModifier implements Cloneable
{
   /**
    *
    **/
   public final static char VALUE_SEPARATOR = '\t';

   /**
    *
    **/
   public final static char EOL = '\n';

   /**
    *
    **/
   static final public char GLYPH_ASSIGN = '=';

   /**
    *
    **/
   static final public char GLYPH_SET = ':';

   /**
    *
    **/
   static final public char GLYPH_AUGMENT = '+';

   /**
    *
    **/
   static final public char GLYPH_DIMINISH = '-';

   /**
    *
    **/
   static final public char GLYPH_QUERY = '?';

   /**
    *
    **/
   char glyph = GLYPH_SET;

   /**
    *
    **/
   String name;

   /**
    *
    **/
   Value value;

   /**
    *
    **/
   public VariableModifier(char glyph, String name, Value value)
   {
      this.glyph = glyph;
      this.name = name;
      this.value = value;
   }

   /**
    *
    **/
   public char getGlyph()
   {
      return glyph;
   }

   /**
    *
    **/
   public String getName()
   {
      return name;
   }

   /**
    *
    **/
   public Value getValue()
   {
      return value;
   }

   /**
    *
    **/
   public String toString()
   {
      return glyph + name + VALUE_SEPARATOR + value + EOL;
   }

   /**
    *
    **/
   public static boolean isTemporary(char glyph)
   {
      return glyph == GLYPH_SET;
   }

   /**
    *
    **/
   public static boolean isGlyph(char ch)
   {
      return !Character.isLetterOrDigit(ch) && ch != '_';
   //switch(ch) {
   //	case GLYPH_ASSIGN:
   //	case GLYPH_SET:
   //	case GLYPH_AUGMENT:
   //	case GLYPH_DIMINISH:
   //	case GLYPH_QUERY: return true;
   //}
   //return false;
   }

   /**
    *
    **/
   public int hashCode()
   {
      return glyph ^ name.hashCode() ^ value.hashCode();
   }

   /**
    *
    **/
   public Object clone()
   {
      try
      {
         VariableModifier m = (VariableModifier)super.clone();
         m.value = new Value(value.toString());
         return m;
      }
      catch(CloneNotSupportedException e)
      {
         // this shouldn't happen, since we are Cloneable
         throw new InternalError();
      }
   }

}