code: public PdfChunk getChunk(int idx) {
          if (idx < 0 || idx >= line.size())
              return null;
          return (PdfChunk)line.get(idx);
      }
docs: Gets a <CODE>PdfChunk</CODE> by index.
  @param idx the index
  @return the <CODE>PdfChunk</CODE> or null if beyond the array