hdfs-text-table-writer.h

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// Copyright 2012 Cloudera Inc.
//
// Licensed 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 IMPALA_EXEC_HDFS_TEXT_TABLE_WRITER_H
#define IMPALA_EXEC_HDFS_TEXT_TABLE_WRITER_H

#include <hdfs.h>
#include <sstream>
#include <boost/scoped_ptr.hpp>

#include "runtime/descriptors.h"
#include "exec/hdfs-table-sink.h"
#include "exec/hdfs-table-writer.h"

namespace impala {

class Codec;
class Expr;
class MemPool;
struct OutputPartition;
class RuntimeState;
struct StringValue;
class TupleDescriptor;
class TupleRow;

class HdfsTextTableWriter : public HdfsTableWriter {
 public:
  HdfsTextTableWriter(HdfsTableSink* parent,
                      RuntimeState* state, OutputPartition* output,
                      const HdfsPartitionDescriptor* partition,
                      const HdfsTableDescriptor* table_desc,
                      const std::vector<ExprContext*>& output_expr_ctxs);

  ~HdfsTextTableWriter() { }

  virtual Status Init();
  virtual Status Finalize();
  virtual Status InitNewFile() { return Status::OK; }
  virtual void Close();
  virtual uint64_t default_block_size() const;
  virtual std::string file_extension() const;

  Status AppendRowBatch(RowBatch* current_row,
                        const std::vector<int32_t>& row_group_indices, bool* new_file);

 private:
  inline void PrintEscaped(const StringValue* str_val);

  Status Flush();

  char tuple_delim_;

  char field_delim_;

  char escape_char_;

  int64_t flush_size_;

  std::stringstream rowbatch_stringstream_;

  THdfsCompression::type codec_;

  boost::scoped_ptr<Codec> compressor_;

  boost::scoped_ptr<MemPool> mem_pool_;
};

}
#endif