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().

              // Additional text is no longer at the start of the line
              startOfLine = false;
              continue;
            } else {
              // Only one
              br.reset();
            }
          }
          onlywhitespace = onlywhitespace && (c == ' ' || c == '\t' || c == '\r');
          out.append((char) c);
        }

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        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);


    in = new BufferedReader(new Support_StringReader(new String(chars)), 12);
    in.skip(6);

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    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);
    
        BufferedReader br = new BufferedReader(new StringReader("01234"), 2);
        br.mark(3);

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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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        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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