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.

    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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         * A common case is a StringReader wrapping a String object.
         */
        final Reader reader = storage.getStorageAs(Reader.class);
        if (reader != null) try {
            // Quick check for "<?xml " header.
            reader.mark(HEADER.length + READ_AHEAD_LIMIT);
            for (int i=0; i<HEADER.length; i++) {
                if (reader.read() != HEADER[i]) {
                    reader.reset();
                    return ProbeResult.UNSUPPORTED_STORAGE;
                }

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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 {
        final 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 (final 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 {
        final 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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          depth = 0;
        }
        lastNodeWasText = false;
        try {
            while (true) {
                reader.mark(1);
                int intChar = reader.read();
                reader.reset();


                if (intChar != -1) {
                    copyNode(reader, formattedXml, prefs);

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    public void checkValid(CharSequence literal) throws DatatypeException {
        try {
            Reader reader = new BufferedReader((new StringReader(
                    "function(event){" + literal.toString() + "}")));
            reader.mark(1);
            try {
                Context context = ContextFactory.getGlobal().enterContext();
                context.setOptimizationLevel(0);
                context.setLanguageVersion(Context.VERSION_1_6);
                // -1 for lineno arg prevents Rhino from appending

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                    iri = 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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    }


    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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      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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