text-converter.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_TEXT_CONVERTER_H
#define IMPALA_EXEC_TEXT_CONVERTER_H

#include "runtime/runtime-state.h"

#include <string>

namespace llvm {
  class Function;
}

namespace impala {

class LlvmCodeGen;
class MemPool;
class SlotDescriptor;
class Status;
struct StringValue;
class Tuple;
class TupleDescriptor;

class TextConverter {
 public:
  TextConverter(char escape_char, const std::string& null_col_val,
      bool check_null = true);

  bool WriteSlot(const SlotDescriptor* slot_desc, Tuple* tuple,
      const char* data, int len, bool copy_string, bool need_escape, MemPool* pool);

  void UnescapeString(const char* src, char* dest, int* len, int64_t maxlen = -1);

  void UnescapeString(StringValue* str, MemPool* pool);

  static llvm::Function* CodegenWriteSlot(LlvmCodeGen* codegen,
      TupleDescriptor* tuple_desc, SlotDescriptor* slot_desc,
      const char* null_col_val, int len, bool check_null);

 private:
  char escape_char_;
  std::string null_col_val_;
  bool check_null_;
};

}

#endif