Examples of org.apache.derby.client.am.ByteArrayCombinerStream

org.apache.derby.client.am.ByteArrayCombinerStream
A stream whose source is a list of byte arrays. This class was created when first implementing the JDBC 4 length less overloads in the client driver. The reason was missing support for streaming data with unknown length from the client to the server. The purpose of the stream is to avoid having to repeatedly copy data to grow the byte buffer, or doing a single big copy to combine the byte arrays in the end. This is important for the temporary solution, since we must materialize the stream to find the length anyway. If there is less data available than the specified length, an exception is thrown. Available data is determined by the length of the byte arrays, not the contents of them. A byte array with all 0's is considered valid data. Besides from truncation, this stream does not change the underlying data in any way.

        byte[] data = {65,66,67,68,69};
        list.add(data);
        list.add(data);
        list.add(data);
        try {
            combiner = new ByteArrayCombinerStream(list, data.length *3 + 1);
            fail("An IllegalArgumentException singalling too little data " +
                    "should have been thrown");
        } catch (IllegalArgumentException iae) {
            // This should happen, continue.
        }

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     */
    public void testNegativeLengthArgument() {
        ArrayList list = new ArrayList(1);
        list.add(new byte[1234]);
        try {
            combiner = new ByteArrayCombinerStream(list, -54);
            fail("An IllegalArgumentException singalling negative length " +
                    "should have been thrown");
        } catch (IllegalArgumentException iae) {
            // This should happen, continue.

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        byte[] data = {66,67,-123,68,69};
        byte[] targetData = {66,67,0,0,0};
        byte[] resData = new byte[5];
        ArrayList list = new ArrayList(1);
        list.add(data);
        combiner = new ByteArrayCombinerStream(list, data.length);
        byte b;
        int index = 0;
        while ((b = (byte)combiner.read()) > 0) {
            resData[index++] = b;
        }

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        byte[] data = {66,67,-123,68,69};
        byte[] targetData = {66,67,0,0,0};
        byte[] resData = new byte[5];
        ArrayList<byte[]> list = new ArrayList<byte[]>(1);
        list.add(data);
        combiner = new ByteArrayCombinerStream(list, data.length);
        byte b;
        int index = 0;
        while ((b = (byte)combiner.read()) > 0) {
            resData[index++] = b;
        }

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        super(name);
    }


    public void testCombineNullRead()
            throws IOException {
        combiner = new ByteArrayCombinerStream(null, 0);
        assertEquals(-1, combiner.read());
    }

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        assertEquals(-1, combiner.read());
    }


    public void testCombineNullReadArray()
            throws IOException {
        combiner = new ByteArrayCombinerStream(null, 0);
        assertEquals(-1, combiner.read(new byte[10], 0, 10));
    }

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        assertEquals(-1, combiner.read(new byte[10], 0, 10));
    }


    public void testCombineAvailableNull()
            throws IOException {
        combiner = new ByteArrayCombinerStream(null, 0);
        assertEquals(0, combiner.available());
    }

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    public void testCombineAvailable4bytes()
            throws IOException {
        byte[] array = {65,66,77,79};
        ArrayList<byte[]> list = new ArrayList<byte[]>(1);
        list.add(array);
        combiner = new ByteArrayCombinerStream(list, 4);
        assertEquals(4, combiner.available());
    }

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            throws IOException {
        byte[] array = {65,66,77,79};
        ArrayList<byte[]> list = new ArrayList<byte[]>(2);
        list.add(array);
        list.add(new byte[4]);
        combiner = new ByteArrayCombinerStream(list, array.length);
        byte[] resArray = new byte[array.length];
        assertEquals(array.length,
                     combiner.read(resArray, 0, resArray.length));
        assertTrue(combiner.read() == -1);
    }

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    public void testCombineOneArray()
            throws IOException {
        ArrayList<byte[]> list = new ArrayList<byte[]>(1);
        list.add(defaultArray);
        combiner = new ByteArrayCombinerStream(list, defaultArray.length);
        byte[] resArray = new byte[defaultArray.length];
        assertEquals(defaultArray.length,
                     combiner.read(resArray,0, resArray.length));
        assertTrue(combiner.read() == -1);
        assertTrue(Arrays.equals(defaultArray, resArray));

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