Examples of java.io.Reader.mark()

java.io.Reader.mark()
Set a Mark position in this Reader. The parameter readLimit indicates how many characters can be read before a mark is invalidated. Sending reset() will reposition the reader back to the marked position provided readLimit has not been surpassed.
This default implementation simply throws IOException and concrete subclasses must provide their own implementations. @param readLimit an int representing how many characters must be read before invalidating the mark. @throws IOException If an error occurs attempting mark this Reader.

      Reader r = req.getReader();
      
      JSONObject args = null;
      String name = getServletContext().getServletContextName();
    
      r.mark(1024);
      if(r.read() != -1) {
        
        r.reset();
        
        args = new JSONObject(r);

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      int h2 = docBuf.indexOf(TERMINATING_DOCHDR,h1);
      String dateStr = extract(docBuf, DATE, DATE_END, h2, null);
      if (dateStr != null) {
        date = trecSrc.parseDate(dateStr);
      }
      r.mark(h2+TERMINATING_DOCHDR_LENGTH);
    }


    r.reset();
    HTMLParser htmlParser = trecSrc.getHtmlParser();
    return htmlParser.parse(docData, name, date, null, r, null);

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                if (LOGGER.isLoggable(Level.FINER))
                  maxChars = 64000;
                if (LOGGER.isLoggable(Level.FINEST))
                  maxChars = 640000;  // Bill gates says 640k is good enough for anyone
                
                xml.mark(maxChars+1); // +1 so if you read the whole thing you can still reset()
                char buffer[] = new char[maxChars];
                int actualRead = xml.read(buffer);
                xml.reset();
                LOGGER.fine("------------XML POST START-----------\n"+new String(buffer,0,actualRead)+"\n------------XML POST END-----------");
                if (actualRead ==maxChars )

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    try {
      reader = createReader(in, encoding);
      
      if (reader.markSupported()) {
        reader.mark(IN_MEMORY_THRESHOLD);
      }
      
      long length = StreamUtil.getContentLength(reader);
      
      if (reader.markSupported() && length <= IN_MEMORY_THRESHOLD) {

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        assertEquals(0, reader.skip(-1));
        
        assertTrue(reader.markSupported());
        reader = sb.asReader();
        assertEquals('s', reader.read());
        reader.mark(-1);
        char[] array = new char[3];
        assertEquals(3, reader.read(array, 0, 3));
        assertEquals('o', array[0]);
        assertEquals('m', array[1]);
        assertEquals('e', array[2]);

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