Examples of org.apache.derby.impl.jdbc.PositionedStoreStream.reposition()

Class org.apache.derby.impl.jdbc.PositionedStoreStream

Examples of org.apache.derby.impl.jdbc.PositionedStoreStream.reposition()

org.apache.derby.impl.jdbc.PositionedStoreStream.reposition()
Repositions the underlying store stream to the requested position.
Repositioning is required because there can be several uses of the store stream, which changes the position of it. If a class is dependent on the underlying stream not changing its position, it must call reposition with the position it expects before using the stream again. @throws IOException if reading from the store stream fails @throws StandardException if resetting the store in stream fails, orsome other exception happens in store @see #getPosition

            assertEquals(127, pss.read(b, 0, 256));
            assertEquals(-1, pss.read(b, 127, 10));
            assertEquals(-1, b[127]);
            assertTrue( -1 != b[126]);
            assertEquals('a', b[0]);
            pss.reposition(0);
        }
    }


    public void testRepositionForwards()
            throws IOException, StandardException {

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        PositionedStoreStream pss = new PositionedStoreStream(in);
        assertEquals(0, pss.getPosition());
        //  Position forwards one by one.
        for (int i=0; i < length; i++) {
            InputStream inComp = new LoopingAlphabetStream(length);
            pss.reposition(i);
            inComp.skip(i);
            assertEquals(inComp.read(), pss.read());
        }
        // Position forwards two by two.
        for (int i=1; i < length; i += 2) {

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            assertEquals(inComp.read(), pss.read());
        }
        // Position forwards two by two.
        for (int i=1; i < length; i += 2) {
            InputStream inComp = new LoopingAlphabetStream(length);
            pss.reposition(i);
            inComp.skip(i);
            assertEquals(inComp.read(), pss.read());
        }
    }

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        PositionedStoreStream pss = new PositionedStoreStream(in);
        assertEquals(0, pss.getPosition());
        // Position backwards one by one.
        for (int i=(int)length; i >= 0; i--) {
            InputStream inComp = new LoopingAlphabetStream(length);
            pss.reposition(i);
            inComp.skip(i);
            assertEquals(inComp.read(), pss.read());
        }
        // Position backwards two by two.
        for (int i=(int)length -1; i >= 0; i -= 2) {

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            assertEquals(inComp.read(), pss.read());
        }
        // Position backwards two by two.
        for (int i=(int)length -1; i >= 0; i -= 2) {
            InputStream inComp = new LoopingAlphabetStream(length);
            pss.reposition(i);
            inComp.skip(i);
            assertEquals(inComp.read(), pss.read());
        }
    }

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    public void testSimpleReadSequence()
            throws IOException, StandardException {
        InputStream in = new LoopingAlphabetStream(26);
        PositionedStoreStream pss = new PositionedStoreStream(in);
        assertEquals('a', pss.read());
        pss.reposition(9);
        assertEquals('j', pss.read());
        pss.reposition(10);
        assertEquals('k', pss.read());
        pss.reposition(9);
        assertEquals('j', pss.read());

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        InputStream in = new LoopingAlphabetStream(26);
        PositionedStoreStream pss = new PositionedStoreStream(in);
        assertEquals('a', pss.read());
        pss.reposition(9);
        assertEquals('j', pss.read());
        pss.reposition(10);
        assertEquals('k', pss.read());
        pss.reposition(9);
        assertEquals('j', pss.read());
        pss.reposition(25);
        assertEquals('z', pss.read());

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        assertEquals('a', pss.read());
        pss.reposition(9);
        assertEquals('j', pss.read());
        pss.reposition(10);
        assertEquals('k', pss.read());
        pss.reposition(9);
        assertEquals('j', pss.read());
        pss.reposition(25);
        assertEquals('z', pss.read());
        assertEquals(-1, pss.read());
        pss.reposition(1);

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        assertEquals('j', pss.read());
        pss.reposition(10);
        assertEquals('k', pss.read());
        pss.reposition(9);
        assertEquals('j', pss.read());
        pss.reposition(25);
        assertEquals('z', pss.read());
        assertEquals(-1, pss.read());
        pss.reposition(1);
        assertEquals('b', pss.read());
        pss.reposition(1);

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        pss.reposition(9);
        assertEquals('j', pss.read());
        pss.reposition(25);
        assertEquals('z', pss.read());
        assertEquals(-1, pss.read());
        pss.reposition(1);
        assertEquals('b', pss.read());
        pss.reposition(1);
        assertEquals('b', pss.read());
    }

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