ClickHouse/dbms/src/Functions/DummyJSONParser.h

58 lines
2.3 KiB
C++
Raw Normal View History

2019-05-13 23:44:55 +00:00
#pragma once
#include <common/StringRef.h>
#include <Common/Exception.h>
#include <Core/Types.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
}
/// This class can be used as an argument for the template class FunctionJSON when we unable to parse JSONs.
/// It can't do anything useful and just throws an exception.
struct DummyJSONParser
{
static constexpr bool need_preallocate = false;
void preallocate(size_t) {}
bool parse(const StringRef &) { throw Exception{"Functions JSON* are not supported without AVX2", ErrorCodes::NOT_IMPLEMENTED}; }
2019-05-13 23:44:55 +00:00
using Iterator = std::nullptr_t;
Iterator getRoot() const { return nullptr; }
2019-05-16 18:22:59 +00:00
static bool isInt64(const Iterator &) { return false; }
static bool isUInt64(const Iterator &) { return false; }
static bool isDouble(const Iterator &) { return false; }
2019-05-13 23:44:55 +00:00
static bool isString(const Iterator &) { return false; }
static bool isArray(const Iterator &) { return false; }
static bool isObject(const Iterator &) { return false; }
static bool isBool(const Iterator &) { return false; }
static bool isNull(const Iterator &) { return true; }
2019-05-16 18:22:59 +00:00
static Int64 getInt64(const Iterator &) { return 0; }
static UInt64 getUInt64(const Iterator &) { return 0; }
static double getDouble(const Iterator &) { return 0; }
2019-05-13 23:44:55 +00:00
static bool getBool(const Iterator &) { return false; }
static StringRef getString(const Iterator &) { return {}; }
static size_t sizeOfArray(const Iterator &) { return 0; }
static bool firstArrayElement(Iterator &) { return false; }
static bool arrayElementByIndex(Iterator &, size_t) { return false; }
static bool nextArrayElement(Iterator &) { return false; }
static size_t sizeOfObject(const Iterator &) { return 0; }
static bool firstObjectMember(Iterator &) { return false; }
static bool firstObjectMember(Iterator &, StringRef &) { return false; }
static bool objectMemberByIndex(Iterator &, size_t) { return false; }
static bool objectMemberByName(Iterator &, const StringRef &) { return false; }
static bool nextObjectMember(Iterator &) { return false; }
static bool nextObjectMember(Iterator &, StringRef &) { return false; }
static bool isObjectMember(const Iterator &) { return false; }
static StringRef getKey(const Iterator &) { return {}; }
2019-05-13 23:44:55 +00:00
};
}