Examples of java.io.InputStream.reset()

java.io.InputStream.reset()
Reset this InputStream to the last marked location. If the readlimit has been passed or no mark has been set, throw IOException. This implementation throws IOException and concrete subclasses should provide proper implementations. @throws IOException If the stream is already closed or another IOException occurs.

            assertEquals("Read After Reset [" + i +"]",  (position + i), input.read());
        }


        // Reset after read limit passed
        try {
            input.reset();
            fail("Read limit exceeded, expected IOException ");
        } catch (IOException e) {
            assertEquals("Read limit IOException message",
                         "Marked position [" + position
                         + "] is no longer valid - passed the read limit ["

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        } catch (UnsupportedOperationException e) {
            assertEquals("mark() error message",  "Mark not supported", e.getMessage());
        }


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

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        in.read();
        in.mark(10);


        in.read();
        in.read();
        in.reset();
        assertEquals('B', in.read());
    }


    public void testMarkResetAfterReadWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };

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        in.read();
        in.mark(10);


        in.read();
        in.read();
        in.reset();
        assertEquals('B', in.read());
    }


    public void testMarkResetBeforeReadWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };

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        in.mark(10);


        in.read();
        in.read();
        in.reset();
        assertEquals('A', in.read());
    }


    public void testMarkResetBeforeReadWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };

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        in.mark(10);


        in.read();
        in.read();
        in.reset();
        assertEquals('A', in.read());
    }


    public void testAvailableWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };

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            InputStream in = new ByteArrayInputStream(out.toByteArray());


            // should not cause SecurityException
            new ObjectInputStream(in);
            in.reset();


            // should not cause SecurityException
            new ObjectInputStream(in) {};
            in.reset();

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            new ObjectInputStream(in);
            in.reset();


            // should not cause SecurityException
            new ObjectInputStream(in) {};
            in.reset();


            try {
                new ObjectInputStream(in) {
                    public Object readUnshared() throws IOException, ClassNotFoundException {
                        return null;

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                    }
                };
                fail("should throw SecurityException 1");
            } catch (SecurityException e) {}


            in.reset();
            try {
                new ObjectInputStream(in) {
                    public GetField readFields() throws IOException,
                            ClassNotFoundException, NotActiveException {
                        return null;

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        new ByteArrayInputStream(bytes), 12);
    try {
      in.skip(6);
      in.mark(14);
      in.read(new byte[14], 0, 14);
      in.reset();
      assertTrue("Wrong bytes", in.read() == 6 && in.read() == 7);
    } catch (IOException e) {
      fail("Exception during mark test 2");
    }

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