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.

  public void testMarkAndReset() throws IOException
  {
    Reader data = new StringReader(DATA);
    Reader reader = new LimitReader(data, 10);
    char[] buf = new char[5];
    reader.mark(100);
    reader.read(buf);
    assertArrayEquals("Hello".toCharArray(), buf);
    reader.reset();
    reader.read(buf);
    assertArrayEquals("Hello".toCharArray(), buf);

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        try {
            Reader reader =
                new BufferedReader(new InputStreamReader(stream, encoding));


            // TIKA-240: Drop the BOM when extracting plain text
            reader.mark(1);
            int bom = reader.read();
            if (bom != '\ufeff') { // zero-width no-break space
                reader.reset();
            }

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        try {
            Reader reader =
                new BufferedReader(new InputStreamReader(stream, encoding));


            // TIKA-240: Drop the BOM when extracting plain text
            reader.mark(1);
            int bom = reader.read();
            if (bom != '\ufeff') { // zero-width no-break space
                reader.reset();
            }

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            continue;
          }
          sawCR = false;
          // Check for a mustache start
          if (c == sm.charAt(0)) {
            br.mark(1);
            if (sm.length() == 1 || br.read() == sm.charAt(1)) {
              // Two mustaches, now capture command
              StringBuilder sb = new StringBuilder();
              while ((c = br.read()) != -1) {
                br.mark(1);

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            br.mark(1);
            if (sm.length() == 1 || br.read() == sm.charAt(1)) {
              // Two mustaches, now capture command
              StringBuilder sb = new StringBuilder();
              while ((c = br.read()) != -1) {
                br.mark(1);
                if (c == em.charAt(0)) {
                  if (em.length() > 1) {
                    if (br.read() == em.charAt(1)) {
                      // Matched end
                      break;

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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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        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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        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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