////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Jan Steemann
////////////////////////////////////////////////////////////////////////////////

#ifndef ARANGOD_AQL_QUERY_STRING_H
#define ARANGOD_AQL_QUERY_STRING_H 1

#include "Basics/Common.h"
#include "Basics/StringRef.h"

#include <iosfwd>

namespace arangodb {
namespace aql {

class QueryString {
 public:
  QueryString(QueryString const& other) = default;
  QueryString& operator=(QueryString const& other) = default;

  QueryString(char const* data, size_t length) 
      : _data(data), _length(length), _hash(0), _hashed(false) {}

  explicit QueryString(arangodb::StringRef const& ref) 
      : QueryString(ref.data(), ref.size()) {}

  explicit QueryString(std::string const& val) 
      : QueryString(val.data(), val.size()) {}
  
  QueryString() : QueryString(nullptr, 0) {}

  ~QueryString() = default;

 public:
  char const* data() const { return _data; }
  size_t size() const { return _length; }
  size_t length() const { return _length; }
  bool empty() const { return (_data == nullptr || _length == 0 || *_data == '\0'); }
  void append(std::string& out) const;
  uint64_t hash();
  std::string extract(size_t maxLength) const;
  std::string extractRegion(int line, int column) const;

 private:
  char const* _data;
  size_t _length;
  uint64_t _hash;
  bool _hashed;
};

std::ostream& operator<<(std::ostream&, QueryString const&);
}
}

#endif