}
@Override
protected Siren10BlockStreamFactory getFactory() {
final Siren10BlockStreamFactory factory = new Siren10BlockStreamFactory(blockSize);
factory.setDocsBlockCompressor(new AForBlockCompressor());
factory.setFreqBlockCompressor(new AForBlockCompressor());
factory.setNodBlockCompressor(new AForBlockCompressor());
factory.setPosBlockCompressor(new AForBlockCompressor());
factory.setDocsBlockDecompressor(new AForBlockDecompressor());
factory.setFreqBlockDecompressor(new AForBlockDecompressor());
factory.setNodBlockDecompressor(new AForBlockDecompressor());
factory.setPosBlockDecompressor(new AForBlockDecompressor());
return factory;