Examples of org.apache.derby.iapi.jdbc.CharacterStreamDescriptor

org.apache.derby.iapi.jdbc.CharacterStreamDescriptor
A description of a byte stream representing characters. The description is used by decoders to properly configure themselves. Note that encoding is not included in the description, because all internal byte streams are expected to be using the modified UTF-8 encoding (see DataInput).
The information in the description is only guaranteed to be valid at the moment it is passed to the decoder object. As the decoder works on the stream, the information in the descriptor will be outdated.
To create a stream descriptor, obtain a {@code Builder} instance and set therequired parameters. @see Builder

                new CharacterStreamDescriptor.Builder().bufferable(true).
                byteLength(byteLength).charLength(charLength).
                curBytePos(curBytePos).curCharPos(curCharPos).
                dataOffset(dataOffset).maxCharLength(maxCharLen).
                stream(emptyStream);
        CharacterStreamDescriptor csd1 = b1.build();
        CharacterStreamDescriptor.Builder b2 =
                new CharacterStreamDescriptor.Builder().copyState(csd1);
        CharacterStreamDescriptor csd2 = b2.build();


        // Test the values.
        assertEquals(csd2.isBufferable(), csd1.isBufferable());
        assertEquals(csd2.isPositionAware(), csd1.isPositionAware());
        assertEquals(csd2.getDataOffset(), csd1.getDataOffset());
        assertEquals(csd2.getCurBytePos(), csd1.getCurBytePos());
        assertEquals(csd2.getCurCharPos(), csd1.getCurCharPos());
        assertEquals(csd2.getByteLength(), csd1.getByteLength());
        assertEquals(csd2.getCharLength(), csd1.getCharLength());
        assertEquals(csd2.getMaxCharLength(), csd1.getMaxCharLength());
        assertTrue(csd2.getStream() == csd1.getStream());


        // Override one value.
        CharacterStreamDescriptor.Builder b3 =
                new CharacterStreamDescriptor.Builder().copyState(csd1).
                maxCharLength(8765);
        CharacterStreamDescriptor csd3 = b3.build();
        assertEquals(8765, csd3.getMaxCharLength());


        // Demonstrate that copying the state after setting a value explicitly
        // overwrites the the set value.
        CharacterStreamDescriptor.Builder b4 =
                new CharacterStreamDescriptor.Builder().
                maxCharLength(8765).
                copyState(csd1);
        CharacterStreamDescriptor csd4 = b4.build();
        assertEquals(csd1.getMaxCharLength(), csd4.getMaxCharLength());
    }

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        // The fake stream uses ascii. Add header and EOF marker.
        super.initialByteLength = CLOBLENGTH + headerLength;
        super.bytesPerChar = BYTES_PER_CHAR;
        EmbedStatement embStmt = (EmbedStatement)createStatement();
        InputStream is = new FakeStoreStream(CLOBLENGTH);
        CharacterStreamDescriptor csd =
                new CharacterStreamDescriptor.Builder().stream(is).
                    charLength(initialCharLength).byteLength(0L).
                    curCharPos(CharacterStreamDescriptor.BEFORE_FIRST).
                    dataOffset(2L).build();
        iClob = new StoreStreamClob(csd, embStmt);

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        // The fake stream uses ascii. Add header and EOF marker.
        super.initialByteLength = CLOBLENGTH + headerLength;
        super.bytesPerChar = BYTES_PER_CHAR;
        EmbedStatement embStmt = (EmbedStatement)createStatement();
        InputStream is = new FakeStoreStream(CLOBLENGTH);
        CharacterStreamDescriptor csd =
                new CharacterStreamDescriptor.Builder().stream(is).
                    charLength(initialCharLength).byteLength(0L).
                    curCharPos(CharacterStreamDescriptor.BEFORE_FIRST).
                    dataOffset(2L).build();
        iClob = new StoreStreamClob(csd, embStmt);

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            SanityManager.ASSERT(!dvd.isNull(),
                                 "clob is created on top of a null column");


        // See if a String or a stream will be the source of the Clob.
        if (dvd.hasStream()) {
            CharacterStreamDescriptor csd = dvd.getStreamWithDescriptor();
            /*
             We are expecting this stream to be a FormatIdInputStream with an
             OverflowInputStream inside. FormatIdInputStream implements
             Resetable, as does OverflowInputStream. This should be the case
             when retrieving data from a long column. However, SQLChar, which is
             the class implementing the getStream() method for dvd.getStream(),
             does not guarantee this for us. In particular, the logging system
             (see StoredPage.logColumn) calls setStream with an argument that
             is sometimes a RememberBytesInputStream on a SQLChar object
             (e.g. see test repStreaming.sql). However, such a SQLChar
             object is going to the log buffer, NOT back to the user, so it
             should not break the ASSERT below.
             */
            if (SanityManager.DEBUG)
                SanityManager.ASSERT(csd.getStream() instanceof Resetable);


            try {
                this.clob = new StoreStreamClob(csd, this);
            } catch (StandardException se) {
                if (se.getMessageId().equals(SQLState.DATA_CONTAINER_CLOSED)) {

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                    }
                    pushStack = true;
                    setupContextStack();


                    if (param.hasStream()) {
                        CharacterStreamDescriptor csd =
                            param.getStreamWithDescriptor();
                        reader = new UTF8Reader(csd, this, syncObject);
                    } else {
                        reader = new StringReader(param.getString());
                    }

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      pushStack = true;
      setupContextStack();


            java.io.Reader ret; // The reader we will return to the user
            if (dvd.hasStream()) {
                CharacterStreamDescriptor csd = dvd.getStreamWithDescriptor();
                // See if we have to enforce a max field size.
                if (lmfs > 0) {
                    csd = new CharacterStreamDescriptor.Builder().copyState(csd).
                            maxCharLength(lmfs).build();
                }

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      pushStack = true;
      setupContextStack();


            java.io.Reader ret; // The reader we will return to the user
            if (dvd.hasStream()) {
                CharacterStreamDescriptor csd = dvd.getStreamWithDescriptor();
                // See if we have to enforce a max field size.
                if (lmfs > 0) {
                    csd = new CharacterStreamDescriptor.Builder().copyState(csd).
                            maxCharLength(lmfs).build();
                }

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      pushStack = true;
      setupContextStack();


            java.io.Reader ret; // The reader we will return to the user
            if (dvd.hasStream()) {
                CharacterStreamDescriptor csd = dvd.getStreamWithDescriptor();
                // See if we have to enforce a max field size.
                if (lmfs > 0) {
                    csd = new CharacterStreamDescriptor.Builder().copyState(csd).
                            maxCharLength(lmfs).build();
                }

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