Examples of java.lang.StringBuffer

java.lang.StringBuffer
A thread-safe, mutable sequence of characters. A string buffer is like a {@link String}, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.
String buffers are safe for use by multiple threads. The methods are synchronized where necessary so that all the operations on any particular instance behave as if they occur in some serial order that is consistent with the order of the method calls made by each of the individual threads involved.
The principal operations on a StringBuffer are the append and insert methods, which are overloaded so as to accept data of any type. Each effectively converts a given datum to a string and then appends or inserts the characters of that string to the string buffer. The append method always adds these characters at the end of the buffer; the insert method adds the characters at a specified point.
For example, if z refers to a string buffer object whose current contents are "start", then the method call z.append("le") would cause the string buffer to contain "startle", whereas z.insert(4, "le") would alter the string buffer to contain "starlet".
In general, if sb refers to an instance of a StringBuffer, then sb.append(x) has the same effect as sb.insert(sb.length(), x).
Whenever an operation occurs involving a source sequence (such as appending or inserting from a source sequence) this class synchronizes only on the string buffer performing the operation, not on the source.
Every string buffer has a capacity. As long as the length of the character sequence contained in the string buffer does not exceed the capacity, it is not necessary to allocate a new internal buffer array. If the internal buffer overflows, it is automatically made larger. As of release JDK 5, this class has been supplemented with an equivalent class designed for use by a single thread, {@link StringBuilder}. The StringBuilder class should generally be used in preference to this one, as it supports all of the same operations but it is faster, as it performs no synchronization. @author Arthur van Hoff @version 1.101, 11/17/05 @see java.lang.StringBuilder @see java.lang.String @since JDK1.0

     * @return The last server response.
     ***/
    public String getReplyString()
    {
        Enumeration en;
        StringBuffer buffer = new StringBuffer(256);


        en = _replyLines.elements();
        while (en.hasMoreElements())
        {
            buffer.append((String)en.nextElement());
            buffer.append(SocketClient.NETASCII_EOL);
        }


        return buffer.toString();
    }

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        m_setterString = "addLiteralResultAttribute";


        return m_setterString;
      }


      StringBuffer outBuf = new StringBuffer();


      outBuf.append("set");


      if ((m_namespace != null)
              && m_namespace.equals(Constants.S_XMLNAMESPACEURI))
      {
        outBuf.append("Xml");
      }


      int n = m_name.length();


      for (int i = 0; i < n; i++)
      {
        char c = m_name.charAt(i);


        if ('-' == c)
        {
          i++;


          c = m_name.charAt(i);
          c = Character.toUpperCase(c);
        }
        else if (0 == i)
        {
          c = Character.toUpperCase(c);
        }


        outBuf.append(c);
      }


      m_setterString = outBuf.toString();
    }


    return m_setterString;
  }

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     throws Exception
  {
    InputStreamReader isr = new InputStreamReader(is);
    BufferedReader br =
      new BufferedReader(isr);
    StringBuffer sb = new StringBuffer();
    String l;
    while((l = br.readLine()) != null) {
      sb.append(l);
      sb.append("<CR>");
    }
    is.close();
    return sb.toString();
  }

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  private void handlePartialScanCommand(TableScanOperator tableScan, ParseContext parseContext, 
      QBParseInfo parseInfo, StatsWork statsWork, GenTezProcContext context,
      Task<StatsWork> statsTask) throws SemanticException {


    String aggregationKey = tableScan.getConf().getStatsAggPrefix();
    StringBuffer aggregationKeyBuffer = new StringBuffer(aggregationKey);
    List<Path> inputPaths = GenMapRedUtils.getInputPathsForPartialScan(parseInfo, aggregationKeyBuffer);
    aggregationKey = aggregationKeyBuffer.toString();
    
    // scan work
    PartialScanWork scanWork = new PartialScanWork(inputPaths);
    scanWork.setMapperCannotSpanPartns(true);
    scanWork.setAggKey(aggregationKey);

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            while (!self.getQuorumVerifier().containsQuorum(newLeaderProposal.ackSet)){
            //while (newLeaderProposal.ackCount <= self.quorumPeers.size() / 2) {
                if (self.tick > self.initLimit) {
                    // Followers aren't syncing fast enough,
                    // renounce leadership!
                    StringBuffer ackToString = new StringBuffer();
                    for(Long id : newLeaderProposal.ackSet)
                        ackToString.append(id + ": ");
                    
                    shutdown("Waiting for a quorum of followers, only synced with: " + ackToString);
                    HashSet<Long> followerSet = new HashSet<Long>();
                    for(FollowerHandler f : followers)
                        followerSet.add(f.getSid());

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        }
      
    if (curChar != '"')
      throw (new InvalidCharException("stringLiteral() was called when the next character was not a double quote.  Position: " + _pos));
    
    StringBuffer sb = new StringBuffer("\"");
    _pos++;
    try {
      curChar = _queryString.charAt(_pos);
      while (curChar != '"') {
        sb.append(curChar);
        //if the current char is backslash, don't check append the next char 
        //without checking whether it's a quote.
        if (curChar == '\\') {
          _pos++;
          curChar = _queryString.charAt(_pos);
          sb.append(curChar);
        }
        _pos++;
        curChar = _queryString.charAt(_pos);
      }
      //append and consume the closing quote
      sb.append(curChar);
      _pos++;
    }
    catch (IndexOutOfBoundsException e) {
      throw ( new InvalidCharException( "End of query string reached, but \" expected." ) );
        }
    
    return ( new Token( STRING_LITERAL, sb.toString() ) );
  }

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        }
      
    if (curChar != '\'')
      throw (new InvalidCharException("charLiteral() was called when the next character was not a double quote.  Position: " + _pos));
    
    StringBuffer sb = new StringBuffer("'");
    _pos++;
    try {
      curChar = _queryString.charAt(_pos);
      //append the first char after the '
      sb.append(curChar);
      _pos++;
      
      //if the current char is backslash, consume escaped char
      if (curChar == '\\') {
        curChar = _queryString.charAt(_pos);
        sb.append(curChar);
        _pos++;
      }
      curChar = _queryString.charAt(_pos);
      if (curChar == '\'') {
        sb.append(curChar);
        _pos++;
      }
      else 
        throw ( new InvalidCharException( "Character literals may only contain a single character or escape sequence.  Position: " + _pos ) );
    }
    catch (IndexOutOfBoundsException e) {
      throw ( new InvalidCharException( "End of query string reached, but \' expected." ) );
    }


    return ( new Token( CHAR_LITERAL, sb.toString() ) );
  }

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        }
      
    if ( ! isDigit(curChar) )
      throw (new InvalidCharException("numericLiteral() was called when the next character was not a digit.  Position: " + _pos));
    
    StringBuffer sb = new StringBuffer().append(curChar);
    _pos++;
    curChar = getChar();
          
    while ( isDigit(curChar) ) {
      sb.append(curChar);
      _pos++;
      curChar = getChar();
    }


    //is this a long or a double
    if (curChar == '.') {
      //it's a double
      sb.append('.');
      _pos++;
      curChar = getChar();
            
      if ( ! isDigit(curChar) )
        throw (new InvalidCharException( "Digit expected after decimal point in double literal. Position: " + _pos));
        
      while ( isDigit(curChar) ) {
        sb.append(curChar);
        _pos++;
        curChar = getChar();
      }
      
      if (curChar == 'E' || curChar == 'e') {
        sb.append(curChar);
        _pos++;
        curChar = getChar();
        
        boolean isExponentSigned = false;
        if (curChar == '+' || curChar == '-') {
          isExponentSigned = true;
          sb.append(curChar);
          _pos++;
          curChar = getChar();
        }
        
        if ( ! isDigit(curChar) ) 
          if (isExponentSigned)
            throw (new InvalidCharException( "Digit expected after sign in exponent (double literal).  Position: " + _pos ));
          else
            throw (new InvalidCharException( "Digit expected after exponent character (double literal).  Position: " + _pos ));
        else {
          sb.append(curChar);
          _pos++;
          curChar = getChar();
          while ( isDigit(curChar) ) {
            sb.append(curChar);
            _pos++;
            curChar = getChar();
          }
        }
      }
      
      return (new Token( DOUBLE_LITERAL, sb.toString() ) );
    }
    else
      //it's a long
      return (new Token( LONG_LITERAL, sb.toString() ) );
  }

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        }
      
    if ( ! isLetter(curChar) )
      throw (new InvalidCharException("identifier() was called when the next character was not a letter.  Position: " + _pos));
    
    StringBuffer sb = new StringBuffer().append(curChar);
    _pos++;
    curChar = getChar();
          
    while ( isDigit(curChar) || isLetter(curChar) || curChar == '_' ) {
      sb.append(curChar);
      _pos++;
      curChar = getChar();
    }


    String ident = sb.toString().toLowerCase();


    // If there's a dot before, we'll assume that it's an identifier in any case.
    if( oldChar == '.' )
        return (new Token( IDENTIFIER, sb.toString() ));


    if (ident.equals("date"))
      return dateLiteral(sb.toString());
    if (ident.equals("time"))
      return timeLiteral(sb.toString());
    if (ident.equals("timestamp"))
      return timeStampLiteral(sb.toString());
      
    if (ident.equals("true") || ident.equals("false"))
      return (new Token( BOOLEAN_LITERAL, sb.toString() ));


    if (keywords.containsKey(ident))
      return (new Token( ((Integer)keywords.get(ident)).intValue(), 
                         sb.toString() ));


    return (new Token( IDENTIFIER, sb.toString() ));


  }

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   *    date literal is otherwise not of the proper form: 
   *    date 'longLiteral-longLiteral-longLiteral'. 
   */
  private Token dateLiteral(String alreadyConsumed) throws InvalidCharException {
  
    StringBuffer sb = new StringBuffer(alreadyConsumed);
    
    char curChar = getChar();
    try {
      
      curChar = _queryString.charAt(_pos);
      
      curChar = consumeWhiteSpace(curChar);
      
      if ( curChar != '\'' )
        throw (new InvalidCharException("The date keyword must be followed by a single quote.  Position: " + _pos));
   
      sb.append(" '");
      _pos++;
      curChar = _queryString.charAt(_pos);
           
      curChar = consumeWhiteSpace(curChar);
      
      if ( ! isDigit(curChar) ) 
        throw (new InvalidCharException("Digit expected in date literal.  Position: " + _pos));
        
      while ( isDigit(curChar) ) {
        sb.append(curChar);
        _pos++;
        curChar = _queryString.charAt(_pos);
      }


      curChar = consumeWhiteSpace(curChar);
      
      if ( curChar != '-' )
        throw (new InvalidCharException("- expected.  Fields in date literal must be separated by a dash.  Position: " + _pos));
   
      sb.append(curChar);
      _pos++;
      curChar = _queryString.charAt(_pos);
           
      curChar = consumeWhiteSpace(curChar);
      
      if ( ! isDigit(curChar) ) 
        throw (new InvalidCharException("Digit expected in date literal.  Position: " + _pos));
        
      while ( isDigit(curChar) ) {
        sb.append(curChar);
        _pos++;
        curChar = _queryString.charAt(_pos);
      }


      curChar = consumeWhiteSpace(curChar);
      
      if ( curChar != '-' )
        throw (new InvalidCharException("- expected.  Fields in date literal must be separated by a dash.  Position: " + _pos));
   
      sb.append(curChar);
      _pos++;
      curChar = _queryString.charAt(_pos);
           
      curChar = consumeWhiteSpace(curChar);
      
      if ( ! isDigit(curChar) ) 
        throw (new InvalidCharException("Digit expected in date literal.  Position: " + _pos));
        
      while ( isDigit(curChar) ) {
        sb.append(curChar);
        _pos++;
        curChar = _queryString.charAt(_pos);
      }


      curChar = consumeWhiteSpace(curChar);
      
      if ( curChar != '\'' )
        throw (new InvalidCharException("' expected.  Date literal must be enclosed by a single quotes.  Position: " + _pos));


      sb.append(curChar);
      _pos++;


      return (new Token( DATE_LITERAL, sb.toString() ));
 


    }
    catch (IndexOutOfBoundsException e) {
      throw (new InvalidCharException("End of query encountered in the middle of date literal."));

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