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.

    }


    private static Reader ensureNonEmptyReader(Reader reader) throws XMLStreamException {
        try {
            Reader mr = reader.markSupported() ? reader : new BufferedReader(reader);
            mr.mark(1);
            if (mr.read() == -1) {
                throw new XMLStreamException("JSON expression can not be empty!");
            }
            mr.reset();
            return mr;

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        assertEquals(0, reader.skip(-1));
        
        assertEquals(true, 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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        assertEquals(0, reader.skip(-1));
        
        assertEquals(true, 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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      chars[i] = (char) i;
    Reader in = new BufferedReader(new Support_StringReader(new String(
        chars)), 12);
    try {
      in.skip(6);
      in.mark(14);
      in.read(new char[14], 0, 14);
      in.reset();
      assertTrue("Wrong chars", in.read() == (char) 6
          && in.read() == (char) 7);
    } catch (IOException e) {

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    }


    in = new BufferedReader(new Support_StringReader(new String(chars)), 12);
    try {
      in.skip(6);
      in.mark(8);
      in.skip(7);
      in.reset();
      assertTrue("Wrong chars 2", in.read() == (char) 6
          && in.read() == (char) 7);
    } catch (IOException e) {

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        assertEquals(0, reader.skip(-1));
        
        assertEquals(true, 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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    /** Test {@link Reader#mark(int)}. */
    public void testMark() throws IOException {
        Reader reader = new CharSequenceReader("FooBar");
        checkRead(reader, "Foo");
        reader.mark(0);
        checkRead(reader, "Bar");
        reader.reset();
        checkRead(reader, "Bar");
        reader.close();
        checkRead(reader, "Foo");

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        assertEquals(0, reader.skip(-1));
        
        assertEquals(true, 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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        assertEquals(0, reader.skip(-1));
        
        assertEquals(true, 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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                  return false;
              }
            }
            
          if ((compare.equals("TEXT") || compare.equals("FRAGMENT")) && (i.hasNext())) {
            reader.mark(1);
            if (' ' != (char)reader.read())
              reader.reset();
            else
              pos++;
          }

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