Package org.iq80.leveldb.util

Examples of org.iq80.leveldb.util.Slice

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        int sharedKeyLength = VariableLengthQuantity.readVariableLengthInt(data);
        int nonSharedKeyLength = VariableLengthQuantity.readVariableLengthInt(data);
        int valueLength = VariableLengthQuantity.readVariableLengthInt(data);

        // read key
        Slice key = Slices.allocate(sharedKeyLength + nonSharedKeyLength);
        SliceOutput sliceOutput = key.output();
        if (sharedKeyLength > 0) {
            Preconditions.checkState(previousEntry != null, "Entry has a shared key but no previous entry was provided");
            sliceOutput.writeBytes(previousEntry.getKey(), 0, sharedKeyLength);
        }
        sliceOutput.writeBytes(data, nonSharedKeyLength);

        // read value
        Slice value = data.readSlice(valueLength);

        return new BlockEntry(key, value);
    }
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    }

    @Override
    public Slice findShortestSeparator(Slice start, Slice limit)
    {
        return new Slice(comparator.findShortestSeparator(start.getBytes(), limit.getBytes()));
    }
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    }

    @Override
    public Slice findShortSuccessor(Slice key)
    {
        return new Slice(comparator.findShortSuccessor(key.getBytes()));
    }
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        // If we just wrote a block, we can now add the handle to index block
        if (pendingIndexEntry) {
            Preconditions.checkState(dataBlockBuilder.isEmpty(), "Internal error: Table has a pending index entry but data block builder is empty");

            Slice shortestSeparator = userComparator.findShortestSeparator(lastKey, key);

            Slice handleEncoding = BlockHandle.writeBlockHandle(pendingHandle);
            indexBlockBuilder.add(shortestSeparator, handleEncoding);
            pendingIndexEntry = false;
        }

        lastKey = key;
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    private BlockHandle writeBlock(BlockBuilder blockBuilder)
            throws IOException
    {
        // close the block
        Slice raw = blockBuilder.finish();

        // attempt to compress the block
        Slice blockContents = raw;
        CompressionType blockCompressionType = CompressionType.NONE;
        if (compressionType == CompressionType.SNAPPY) {
            ensureCompressedOutputCapacity(maxCompressedLength(raw.length()));
            try {
                int compressedSize = Snappy.compress(raw.getRawArray(), raw.getRawOffset(), raw.length(), compressedOutput.getRawArray(), 0);

                // Don't use the compressed data if compressed less than 12.5%,
                if (compressedSize < raw.length() - (raw.length() / 8)) {
                    blockContents = compressedOutput.slice(0, compressedSize);
                    blockCompressionType = CompressionType.SNAPPY;
                }
            }
            catch (IOException ignored) {
                // compression failed, so just store uncompressed form
            }
        }

        // create block trailer
        BlockTrailer blockTrailer = new BlockTrailer(blockCompressionType, crc32c(blockContents, blockCompressionType));
        Slice trailer = BlockTrailer.writeBlockTrailer(blockTrailer);

        // create a handle to this block
        BlockHandle blockHandle = new BlockHandle(position, blockContents.length());

        // write data and trailer
        position += fileChannel.write(new ByteBuffer[] {blockContents.toByteBuffer(), trailer.toByteBuffer()});

        // clean up state
        blockBuilder.reset();

        return blockHandle;
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        // TODO(postrelease): Add stats and other meta blocks
        BlockHandle metaindexBlockHandle = writeBlock(metaIndexBlockBuilder);

        // add last handle to index block
        if (pendingIndexEntry) {
            Slice shortSuccessor = userComparator.findShortSuccessor(lastKey);

            Slice handleEncoding = BlockHandle.writeBlockHandle(pendingHandle);
            indexBlockBuilder.add(shortSuccessor, handleEncoding);
            pendingIndexEntry = false;
        }

        // write index block
        BlockHandle indexBlockHandle = writeBlock(indexBlockBuilder);

        // write footer
        Footer footer = new Footer(metaindexBlockHandle, indexBlockHandle);
        Slice footerEncoding = Footer.writeFooter(footer);
        position += fileChannel.write(footerEncoding.toByteBuffer());
    }
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        return new BlockHandle(offset, (int) size);
    }

    public static Slice writeBlockHandle(BlockHandle blockHandle)
    {
        Slice slice = Slices.allocate(MAX_ENCODED_LENGTH);
        SliceOutput sliceOutput = slice.output();
        writeBlockHandleTo(blockHandle, sliceOutput);
        return slice.slice();
    }
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        if (sharedBytes < Math.min(start.length(), limit.length())) {
            // if we can add one to the last shared byte without overflow and the two keys differ by more than
            // one increment at this location.
            int lastSharedByte = start.getUnsignedByte(sharedBytes);
            if (lastSharedByte < 0xff && lastSharedByte + 1 < limit.getUnsignedByte(sharedBytes)) {
                Slice result = start.copySlice(0, sharedBytes + 1);
                result.setByte(sharedBytes, lastSharedByte + 1);

                assert (compare(result, limit) < 0) : "start must be less than last limit";
                return result;
            }
        }
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    {
        // Find first character that can be incremented
        for (int i = 0; i < key.length(); i++) {
            int b = key.getUnsignedByte(i);
            if (b != 0xff) {
                Slice result = key.copySlice(0, i + 1);
                result.setByte(i, b + 1);
                return result;
            }
        }
        // key is a run of 0xffs.  Leave it alone.
        return key;
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        return new Footer(metaindexBlockHandle, indexBlockHandle);
    }

    public static Slice writeFooter(Footer footer)
    {
        Slice slice = Slices.allocate(ENCODED_LENGTH);
        writeFooter(footer, slice.output());
        return slice;
    }
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