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.

      chars[i] = (char) i;
    Reader in = new BufferedReader(new Support_StringReader(new String(
        chars)), 12);


    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);

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    assertTrue("Wrong chars", in.read() == (char) 6
        && in.read() == (char) 7);


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

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        for (; position < 3; position++) {
            assertEquals("Read Before Mark [" + position +"]",  position, reader.read());
        }


        // Mark
        reader.mark(readlimit);


        // Read further
        for (int i = 0; i < 3; i++) {
            assertEquals("Read After Mark [" + i +"]",  (position + i), reader.read());
        }

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    public void testMarkNotSupported() throws Exception {
        Reader reader = new TestNullReader(100, false, true);
        assertFalse("Mark Should NOT be Supported", reader.markSupported());


        try {
            reader.mark(5);
            fail("mark() should throw UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            assertEquals("mark() error message",  "Mark not supported", e.getMessage());
        }

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      chars[i] = (char) i;
    Reader in = new BufferedReader(new Support_StringReader(new String(
        chars)), 12);


    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);

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    assertTrue("Wrong chars", in.read() == (char) 6
        && in.read() == (char) 7);


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

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    @Override
    public void mark(int readAheadLimit) throws IOException {
      Reader rdr = getReader();
      if (rdr != null) {
        rdr.mark(readAheadLimit);
      }
    }


    @Override
    public void reset() throws IOException {

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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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    }


    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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      chars[i] = (char) i;
    Reader in = new BufferedReader(new Support_StringReader(new String(
        chars)), 12);


    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);

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