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.

            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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    /** 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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        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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        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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    /** Test {@link Reader#mark(int)}. */
    @Test
    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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      int read;
      read = reader.read(cc);
      assertEquals(6, read);
      assertEquals("Quick ", new String(cc));
      
      reader.mark(100);
      
      read = reader.read(cc);
      assertEquals(6, read);
      assertEquals("brown ", new String(cc));

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                    url = null; // Don't bother user with generic IRI syntax
                    Reader reader = new BufferedReader(
                            new Utf8PercentDecodingReader(new StringReader(
                                    "function(event){" + tail.toString() + "}")));
                    // XXX CharSequenceReader
                    reader.mark(1);
                    int c = reader.read();
                    if (c != 0xFEFF) {
                        reader.reset();
                    }
                    try {

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