public static void formatValue(final StringBuffer buffer,final String value,final boolean alwaysUseQuotes){
  if (buffer == null) {
    throw new IllegalArgumentException("String buffer may not be null");
  }
  if (value == null) {
    throw new IllegalArgumentException("Value buffer may not be null");
  }
  if (alwaysUseQuotes) {
    buffer.append('"');
    for (int i=0; i < value.length(); i++) {
      final char ch=value.charAt(i);
      if (isUnsafeChar(ch)) {
        buffer.append('\\');
      }
      buffer.append(ch);
    }
    buffer.append('"');
  }
 else {
    final int offset=buffer.length();
    boolean unsafe=false;
    for (int i=0; i < value.length(); i++) {
      final char ch=value.charAt(i);
      if (isSeparator(ch)) {
        unsafe=true;
      }
      if (isUnsafeChar(ch)) {
        buffer.append('\\');
      }
      buffer.append(ch);
    }
    if (unsafe) {
      buffer.insert(offset,'"');
      buffer.append('"');
    }
  }
}

public static void formatValue ( final StringBuffer buffer , final String value , final boolean alwaysUseQuotes ) { if ( buffer == null ) { throw new IllegalArgumentException ( "String buffer may not be null" ) ; } if ( value == null ) { throw new IllegalArgumentException ( "Value buffer may not be null" ) ; } if ( alwaysUseQuotes ) { buffer . append ( '"' ) ; for ( int i = 0 ; i < value . length ( ) ; i ++ ) { final char ch = value . charAt ( i ) ; if ( isUnsafeChar ( ch ) ) { buffer . append ( '\\' ) ; } buffer . append ( ch ) ; } buffer . append ( '"' ) ; } else { final int offset = buffer . length ( ) ; boolean unsafe = false ; for ( int i = 0 ; i < value . length ( ) ; i ++ ) { final char ch = value . charAt ( i ) ; if ( isSeparator ( ch ) ) { unsafe = true ; } if ( isUnsafeChar ( ch ) ) { buffer . append ( '\\' ) ; } buffer . append ( ch ) ; } if ( unsafe ) { buffer . insert ( offset , '"' ) ; buffer . append ( '"' ) ; } } }
formats the given parameter value using formatting rules defined in rfc 2616
