Examples of java.io.Reader.reset()

java.io.Reader.reset()
Reset this Readers position to the last mark() location. Invocations of read()/skip() will occur from this new location. If this Reader was not marked, the implementation of reset() is implementation specific. See the comment for the specific Reader subclass for implementation details. The default action is to throw IOException. @throws IOException If a problem occured or the receiver does not support mark()/reset().

        
        assertTrue("Mark Should be Supported", reader.markSupported());


        // No Mark
        try {
            reader.reset();
            fail("Read limit exceeded, expected IOException ");
        } catch (IOException e) {
            assertEquals("No Mark IOException message",
                         "No position has been marked",
                         e.getMessage());

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


        // Reset
        reader.reset();


        // Read From marked position
        for (int i = 0; i < readlimit + 1; i++) {
            assertEquals("Read After Reset [" + i +"]",  position + i, reader.read());
        }

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


        // Reset after read limit passed
        try {
            reader.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                         + "] is no longer valid - passed the read limit ["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 {
            reader.reset();
            fail("reset() should throw UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            assertEquals("reset() error message",  "Mark not supported", e.getMessage());
        }
    }

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    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");
        reader.reset();
        checkRead(reader, "Foo");

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        checkRead(reader, "Bar");
        reader.reset();
        checkRead(reader, "Bar");
        reader.close();
        checkRead(reader, "Foo");
        reader.reset();
        checkRead(reader, "Foo");
    }


    /** Test {@link Reader#skip(long)}. */
    @Test

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    public void testSkip() throws IOException {
        Reader reader = new CharSequenceReader("FooBar");
        assertEquals(3, reader.skip(3));
        checkRead(reader, "Bar");
        assertEquals(-1, reader.skip(3));
        reader.reset();
        assertEquals(2, reader.skip(2));
        assertEquals(4, reader.skip(10));
        assertEquals(-1, reader.skip(1));
        reader.close();
        assertEquals(6, reader.skip(20));

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        char[] array = new char[3];
        assertEquals(3, reader.read(array, 0, 3));
        assertEquals('o', array[0]);
        assertEquals('m', array[1]);
        assertEquals('e', array[2]);
        reader.reset();
        assertEquals(1, reader.read(array, 1, 1));
        assertEquals('o', array[0]);
        assertEquals('o', array[1]);
        assertEquals('e', array[2]);
        assertEquals(2, reader.skip(2));

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        assertEquals(0, array[2]);
        
        reader.skip(9);
        assertEquals(-1, reader.read(array, 0, 1));
        
        reader.reset();
        array = new char[30];
        assertEquals(9, reader.read(array, 0, 30));
    }


    //-----------------------------------------------------------------------

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        throws SQLException {
    Reader clobInput = new StringReader(clobData);
        PreparedStatement pStmt = 
            con.prepareStatement("update BLOBCLOB set CLOBDATA = ? where ID = ?");
        try {
            clobInput.reset();
        } catch (IOException ioe) {
            fail("Failed to reset clob input stream: " + ioe.getMessage());
        }
        pStmt.setClob(1, clobInput, clobData.length());
        pStmt.setInt(2, ID_SAMPLEVALUES);

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