Examples of org.apache.derby.iapi.types.ClobStreamHeaderGenerator

org.apache.derby.iapi.types.ClobStreamHeaderGenerator
Generates stream headers for Clob data values.
THREAD SAFETY NOTE: This class is considered thread safe, even though it strictly speaking isn't. However, with the assumption that an instance of this class cannot be shared across databases with different versions, the only bad thing that can happen is that the mode is obtained several times.

            throws IOException {
        final int valueLen = DEFAULT_INTERNAL_BUFFER_SIZE + 5*1024;
        InputStream is = getStream(valueLen);
        is.mark(valueLen - 1024);
        // Obtain a header generator to compare with.
        ClobStreamHeaderGenerator hdrGen = new ClobStreamHeaderGenerator(false);
        byte[] hdrTmp = new byte[100];
        int headerLen = hdrGen.generateInto(hdrTmp, 0, valueLen);
        byte[] hdr1 = new byte[headerLen];
        System.arraycopy(hdrTmp, 0, hdr1, 0, headerLen);
        byte[] hdr2 = new byte[headerLen];
        // Get the first bytes from the stream being tested.
        assertEquals(headerLen, is.read(hdr2));

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     */
    private InputStream getStream(int length) {
        Reader src = new LoopingAlphabetReader(length,
                                        CharAlphabet.modernLatinLowercase());
        InputStream is = new ReaderToUTF8Stream(
                src, length, 0, "CLOB", new ClobStreamHeaderGenerator(false));
        assertTrue("The stream doesn't support mark/reset", is.markSupported());
        return is;
    }

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    public void testSkipUntilEOFOnLongStreamCJK()
            throws IOException {
        final int charLength = 127019;
        InputStream in = new ReaderToUTF8Stream(
                new LoopingAlphabetReader(charLength, CharAlphabet.cjkSubset()),
                charLength, 0, TYPENAME, new ClobStreamHeaderGenerator(true));
        in.skip(HEADER_LENGTH); // Skip encoded length added by ReaderToUTF8Stream.
        assertEquals(charLength, UTF8Util.skipUntilEOF(in));
    }

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    public void testSkipFullyOnTooShortStreamCJK()
            throws IOException {
        final int charLength = 161019;
        InputStream in = new ReaderToUTF8Stream(
                new LoopingAlphabetReader(charLength, CharAlphabet.cjkSubset()),
                charLength, 0, TYPENAME, new ClobStreamHeaderGenerator(true));
        in.skip(HEADER_LENGTH); // Skip encoded length added by ReaderToUTF8Stream.
        try {
            UTF8Util.skipFully(in, charLength + 100);
            fail("Should have failed because of too short stream.");
        } catch (EOFException eofe) {

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            throws IOException {
        final int valueLen = DEFAULT_INTERNAL_BUFFER_SIZE + 5*1024;
        InputStream is = getStream(valueLen);
        is.mark(valueLen - 1024);
        // Obtain a header generator to compare with.
        ClobStreamHeaderGenerator hdrGen = new ClobStreamHeaderGenerator(false);
        byte[] hdrTmp = new byte[100];
        int headerLen = hdrGen.generateInto(hdrTmp, 0, valueLen);
        byte[] hdr1 = new byte[headerLen];
        System.arraycopy(hdrTmp, 0, hdr1, 0, headerLen);
        byte[] hdr2 = new byte[headerLen];
        // Get the first bytes from the stream being tested.
        assertEquals(headerLen, is.read(hdr2));

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     */
    private InputStream getStream(int length) {
        Reader src = new LoopingAlphabetReader(length,
                                        CharAlphabet.modernLatinLowercase());
        InputStream is = new ReaderToUTF8Stream(
                src, length, 0, "CLOB", new ClobStreamHeaderGenerator(false));
        assertTrue("The stream doesn't support mark/reset", is.markSupported());
        return is;
    }

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    public void testSkipUntilEOFOnLongStreamCJK()
            throws IOException {
        final int charLength = 127019;
        InputStream in = new ReaderToUTF8Stream(
                new LoopingAlphabetReader(charLength, CharAlphabet.cjkSubset()),
                charLength, 0, TYPENAME, new ClobStreamHeaderGenerator(true));
        in.skip(HEADER_LENGTH); // Skip encoded length added by ReaderToUTF8Stream.
        assertEquals(charLength, UTF8Util.skipUntilEOF(in));
    }

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    public void testSkipFullyOnTooShortStreamCJK()
            throws IOException {
        final int charLength = 161019;
        InputStream in = new ReaderToUTF8Stream(
                new LoopingAlphabetReader(charLength, CharAlphabet.cjkSubset()),
                charLength, 0, TYPENAME, new ClobStreamHeaderGenerator(true));
        in.skip(HEADER_LENGTH); // Skip encoded length added by ReaderToUTF8Stream.
        try {
            UTF8Util.skipFully(in, charLength + 100);
            fail("Should have failed because of too short stream.");
        } catch (EOFException eofe) {

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Related Classes of org.apache.derby.iapi.types.ClobStreamHeaderGenerator

org.apache.derby.iapi.db.DatabaseContext

org.apache.derby.iapi.sql.dictionary.DataDictionary

org.apache.derbyTesting.unitTests.junit.ReaderToUTF8StreamTest

org.apache.derbyTesting.unitTests.junit.UTF8UtilTest

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