public LongConstant addLong(long value){
  LongConstant entry=getLongByValue(value);
  if (entry != null)   return entry;
  entry=new LongConstant(this,_entries.size(),value);
  addConstant(entry);
  addConstant(null);
  return entry;
}

public LongConstant addLong ( long value ) { LongConstant entry = getLongByValue ( value ) ; if ( entry != null ) return entry ; entry = new LongConstant ( this , _entries . size ( ) , value ) ; addConstant ( entry ) ; addConstant ( null ) ; return entry ; }
adds a long constant .
