131 lines
3.9 KiB
C++
131 lines
3.9 KiB
C++
/*
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* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
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* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/DeprecatedString.h>
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#include <AK/Format.h>
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#include <AK/Optional.h>
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#include <AK/StringView.h>
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#include <AK/Variant.h>
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#include <AK/Vector.h>
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#include <LibSQL/Forward.h>
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#include <LibSQL/Result.h>
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#include <LibSQL/Type.h>
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namespace SQL {
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/**
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* A `Value` is an atomic piece of SQL data`. A `Value` has a basic type
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* (Text/String, Integer, Float, etc). Richer types are implemented in higher
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* level layers, but the resulting data is stored in these `Value` objects.
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*/
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class Value {
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public:
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explicit Value(SQLType sql_type = SQLType::Null);
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explicit Value(DeprecatedString);
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explicit Value(int);
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explicit Value(u32);
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explicit Value(double);
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Value(Value const&);
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Value(Value&&);
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~Value();
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static ResultOr<Value> create_tuple(NonnullRefPtr<TupleDescriptor>);
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static ResultOr<Value> create_tuple(Vector<Value>);
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template<typename T>
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requires(SameAs<RemoveCVReference<T>, bool>) explicit Value(T value)
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: m_type(SQLType::Boolean)
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, m_value(value)
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{
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}
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[[nodiscard]] SQLType type() const;
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[[nodiscard]] StringView type_name() const;
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[[nodiscard]] bool is_type_compatible_with(SQLType) const;
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[[nodiscard]] bool is_null() const;
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[[nodiscard]] DeprecatedString to_deprecated_string() const;
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[[nodiscard]] Optional<int> to_int() const;
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[[nodiscard]] Optional<u32> to_u32() const;
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[[nodiscard]] Optional<double> to_double() const;
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[[nodiscard]] Optional<bool> to_bool() const;
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[[nodiscard]] Optional<Vector<Value>> to_vector() const;
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Value& operator=(Value);
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Value& operator=(DeprecatedString);
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Value& operator=(int);
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Value& operator=(u32);
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Value& operator=(double);
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ResultOr<void> assign_tuple(NonnullRefPtr<TupleDescriptor>);
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ResultOr<void> assign_tuple(Vector<Value>);
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template<typename T>
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requires(SameAs<RemoveCVReference<T>, bool>) Value& operator=(T value)
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{
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m_type = SQLType::Boolean;
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m_value = value;
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return *this;
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}
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[[nodiscard]] size_t length() const;
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[[nodiscard]] u32 hash() const;
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void serialize(Serializer&) const;
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void deserialize(Serializer&);
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[[nodiscard]] int compare(Value const&) const;
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bool operator==(Value const&) const;
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bool operator==(StringView) const;
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bool operator==(int) const;
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bool operator==(u32) const;
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bool operator==(double) const;
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bool operator!=(Value const&) const;
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bool operator<(Value const&) const;
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bool operator<=(Value const&) const;
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bool operator>(Value const&) const;
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bool operator>=(Value const&) const;
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ResultOr<Value> add(Value const&) const;
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ResultOr<Value> subtract(Value const&) const;
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ResultOr<Value> multiply(Value const&) const;
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ResultOr<Value> divide(Value const&) const;
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ResultOr<Value> modulo(Value const&) const;
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ResultOr<Value> shift_left(Value const&) const;
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ResultOr<Value> shift_right(Value const&) const;
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ResultOr<Value> bitwise_or(Value const&) const;
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ResultOr<Value> bitwise_and(Value const&) const;
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[[nodiscard]] TupleElementDescriptor descriptor() const;
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private:
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friend Serializer;
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struct TupleValue {
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NonnullRefPtr<TupleDescriptor> descriptor;
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Vector<Value> values;
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};
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using ValueType = Variant<DeprecatedString, int, double, bool, TupleValue>;
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static ResultOr<NonnullRefPtr<TupleDescriptor>> infer_tuple_descriptor(Vector<Value> const& values);
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Value(NonnullRefPtr<TupleDescriptor> descriptor, Vector<Value> values);
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SQLType m_type { SQLType::Null };
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Optional<ValueType> m_value;
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};
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}
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template<>
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struct AK::Formatter<SQL::Value> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, SQL::Value const& value)
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{
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return Formatter<StringView>::format(builder, value.to_deprecated_string());
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}
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};
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