Examples of java.nio.CharBuffer.charAt()

java.nio.CharBuffer.charAt()
Returns the character located at the specified index in the buffer. The index value is referenced from the current buffer position. @param index The index referenced from the current buffer position. It must not be less than zero but less than the value obtained from a call to remaining() @return the character located at the specified index (referenced from thecurrent position) in the buffer. @exception IndexOutOfBoundsException If the index is invalid

      ByteBuffer byFrom = getChannel().map(FileChannel.MapMode.READ_ONLY, begin, 128);
      CharBuffer chFrom = decoder.decode(byFrom);


      int start = 0;
      // Ignore any white spaces and line feed
      char c = chFrom.charAt(start);
      while (c==' ' || c=='\r' || c=='\n' || c=='\t') c = chFrom.charAt(++start);
      // If first line does not start with message preffx then raise an exception
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getMessageAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");
      // Skip the From line

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      CharBuffer chFrom = decoder.decode(byFrom);


      int start = 0;
      // Ignore any white spaces and line feed
      char c = chFrom.charAt(start);
      while (c==' ' || c=='\r' || c=='\n' || c=='\t') c = chFrom.charAt(++start);
      // If first line does not start with message preffx then raise an exception
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getMessageAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");
      // Skip the From line
      while (chFrom.charAt(start++)!=(char) 10) ;

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      while (c==' ' || c=='\r' || c=='\n' || c=='\t') c = chFrom.charAt(++start);
      // If first line does not start with message preffx then raise an exception
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getMessageAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");
      // Skip the From line
      while (chFrom.charAt(start++)!=(char) 10) ;


      log.debug("  skip = " + String.valueOf(start));
      log.debug("  start = " + String.valueOf(begin+start));


      MappedByteBuffer byBuffer = getChannel().map(FileChannel.MapMode.READ_ONLY, begin+start, size);

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      log.debug("from line decoded");


      int start = 0;
      // Ignore any white spaces and line feed
      char c = chFrom.charAt(start);
      while (c==' ' || c=='\r' || c=='\n' || c=='\t') c = chFrom.charAt(++start);
      // If first line does not start with message preffx then raise an exception
      log.debug("first line is " + chFrom.subSequence(start, start+FROM__PREFIX.length()).toString());
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getPartAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");

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      log.debug("from line decoded");


      int start = 0;
      // Ignore any white spaces and line feed
      char c = chFrom.charAt(start);
      while (c==' ' || c=='\r' || c=='\n' || c=='\t') c = chFrom.charAt(++start);
      // If first line does not start with message preffx then raise an exception
      log.debug("first line is " + chFrom.subSequence(start, start+FROM__PREFIX.length()).toString());
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getPartAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");
      // Skip the From line

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      // If first line does not start with message preffx then raise an exception
      log.debug("first line is " + chFrom.subSequence(start, start+FROM__PREFIX.length()).toString());
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getPartAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");
      // Skip the From line
      while (chFrom.charAt(start++)!=(char) 10) ;


      start += offset;


      log.debug("  skip = " + String.valueOf(start));
      log.debug("  start = " + String.valueOf(start));

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      ByteBuffer byFrom = getChannel().map(FileChannel.MapMode.READ_ONLY, position, 256);
      CharBuffer chFrom = decoder.decode(byFrom);


      int start = 0;
      // Ignore any white spaces and line feed
      char c = chFrom.charAt(start);
      while (c==' ' || c=='\r' || c=='\n' || c=='\t') c = chFrom.charAt(++start);
      // If first line does not start with message preffx then raise an exception
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getMessageAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");
      // Skip the From line

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      CharBuffer chFrom = decoder.decode(byFrom);


      int start = 0;
      // Ignore any white spaces and line feed
      char c = chFrom.charAt(start);
      while (c==' ' || c=='\r' || c=='\n' || c=='\t') c = chFrom.charAt(++start);
      // If first line does not start with message preffx then raise an exception
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getMessageAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");
      // Skip the From line
      while (chFrom.charAt(start++)!=(char) 10) ;

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      while (c==' ' || c=='\r' || c=='\n' || c=='\t') c = chFrom.charAt(++start);
      // If first line does not start with message preffx then raise an exception
      if (!chFrom.subSequence(start, start+FROM__PREFIX.length()).toString().equals(FROM__PREFIX))
        throw new IOException ("MboxFile.getMessageAsStream() starting position " + String.valueOf(start) + " \""+chFrom.subSequence(start, start+FROM__PREFIX.length()).toString()+"\" does not match a begin message token \"" + FROM__PREFIX + "\"");
      // Skip the From line
      while (chFrom.charAt(start++)!=(char) 10) ;


      log.debug("  skip = " + String.valueOf(start));
      log.debug("  start = " + String.valueOf(position+start));


      MappedByteBuffer byBuffer = getChannel().map(FileChannel.MapMode.READ_ONLY, position+start, size-start);

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        {
            int start = 0;
            /* look for a $ that introduces a variable */
            // FINDDOLLAR:
            for(int i=0; i < len; i++){
                if( buff.charAt(i) == '$' ){


                    /* write leading non-variable part to dest */
                    if(start != i){
                        dest.append(buff, start, i);
                    }

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