| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| #ifndef KUDU_CFILE_TYPE_ENCODINGS_H_ |
| #define KUDU_CFILE_TYPE_ENCODINGS_H_ |
| |
| #include "kudu/common/common.pb.h" |
| #include "kudu/util/status.h" |
| |
| namespace kudu { |
| class TypeInfo; |
| |
| namespace cfile { |
| class BlockBuilder; |
| class BlockDecoder; |
| class CFileReader; |
| class CFileIterator; |
| struct WriterOptions; |
| |
| // Runtime Information for type encoding/decoding |
| // including the ability to build BlockDecoders and BlockBuilders |
| // for each supported encoding |
| // Mimicked after common::TypeInfo et al |
| class TypeEncodingInfo { |
| public: |
| |
| static Status Get(const TypeInfo* typeinfo, EncodingType encoding, const TypeEncodingInfo** out); |
| |
| static const EncodingType GetDefaultEncoding(const TypeInfo* typeinfo); |
| |
| EncodingType encoding_type() const { return encoding_type_; } |
| |
| Status CreateBlockBuilder(BlockBuilder **bb, const WriterOptions *options) const; |
| |
| // Create a BlockDecoder. Sets *bd to the newly created decoder, |
| // if successful, otherwise returns a non-OK Status. |
| // |
| // iter parameter will only be used when it is dictionary encoding |
| Status CreateBlockDecoder(BlockDecoder **bd, const Slice &slice, |
| CFileIterator *iter) const; |
| private: |
| |
| friend class TypeEncodingResolver; |
| template<typename TypeEncodingTraitsClass> TypeEncodingInfo(TypeEncodingTraitsClass t); |
| |
| EncodingType encoding_type_; |
| |
| typedef Status (*CreateBlockBuilderFunc)(BlockBuilder **, const WriterOptions *); |
| const CreateBlockBuilderFunc create_builder_func_; |
| |
| typedef Status (*CreateBlockDecoderFunc)(BlockDecoder **, const Slice &, |
| CFileIterator *); |
| const CreateBlockDecoderFunc create_decoder_func_; |
| |
| DISALLOW_COPY_AND_ASSIGN(TypeEncodingInfo); |
| }; |
| |
| |
| } // namespace cfile |
| } // namespace kudu |
| |
| #endif /* KUDU_CFILE_TYPE_ENCODINGS_H_ */ |