private void encodeVolatile(Entry entry, DataConfig dataConfig) throws DirectoryException {
// Encode the entry for later use.
entry.encode(entryBuffer, dataConfig.getEntryEncodeConfig());
// First write the DB format version byte.
encodedBuffer.appendByte(DnKeyFormat.FORMAT_VERSION);
try {
// Then start the ASN1 sequence.
writer.writeStartSequence(TAG_TREE_ENTRY);
if (dataConfig.isCompressed()) {
OutputStream compressor = null;
try {
compressor = new DeflaterOutputStream(compressedEntryBuffer.asOutputStream());
entryBuffer.copyTo(compressor);
} finally {
closeSilently(compressor);
}
// Compression needed and successful.
writer.writeInteger(entryBuffer.length());
writer.writeOctetString(compressedEntryBuffer);
} else {
writer.writeInteger(0);
writer.writeOctetString(entryBuffer);
}
writer.writeEndSequence();
} catch (IOException ioe) {
// TODO: This should never happen with byte buffer.
logger.traceException(ioe);
}
}
private Entry decode(ByteString bytes, CompressedSchema compressedSchema)
throws DirectoryException, DecodeException, IOException {
// Get the format version.
byte formatVersion = bytes.byteAt(0);
if (formatVersion != DnKeyFormat.FORMAT_VERSION) {
throw DecodeException.error(ERR_INCOMPATIBLE_ENTRY_VERSION.get(formatVersion));
}
// Read the ASN1 sequence.
ASN1Reader reader = ASN1.getReader(bytes.subSequence(1, bytes.length()));
reader.readStartSequence();
// See if it was compressed.
int uncompressedSize = (int) reader.readInteger();
if (uncompressedSize > 0) {
// It was compressed.
reader.readOctetString(compressedEntryBuffer);
OutputStream decompressor = null;
try {
// TODO: Should handle the case where uncompress fails
decompressor = new InflaterOutputStream(entryBuffer.asOutputStream());
compressedEntryBuffer.copyTo(decompressor);
} finally {
closeSilently(decompressor);
}
// Since we are used the cached buffers (ByteStringBuilders),
// the decoded attribute values will not refer back to the
// original buffer.
return Entry.decode(entryBuffer.asReader(), compressedSchema);
} else {
// Since we don't have to do any decompression, we can just decode
// the entry directly.
ByteString encodedEntry = reader.readOctetString();
return Entry.decode(encodedEntry.asReader(), compressedSchema);
}
}
private void release() {
closeSilently(writer);
encodedBuffer.clearAndTruncate(maxBufferSize, BUFFER_INIT_SIZE);
entryBuffer.clearAndTruncate(maxBufferSize, BUFFER_INIT_SIZE);
compressedEntryBuffer.clearAndTruncate(maxBufferSize, BUFFER_INIT_SIZE);
}
