realm-js/parser/query_builder.hpp

////////////////////////////////////////////////////////////////////////////
//
// Copyright 2015 Realm 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 REALM_QUERY_BUILDER_HPP
#define REALM_QUERY_BUILDER_HPP

#include <string>
#include "parser.hpp"
#include "object_accessor.hpp"

namespace realm {
    class Query;
    class Schema;

    namespace query_builder {
        class Arguments;

        void apply_predicate(Query &query, parser::Predicate &predicate, Arguments &arguments, Schema &schema, std::string objectType);

        class Arguments
        {
          public:
            virtual bool bool_for_argument(size_t argument_index) = 0;
            virtual long long long_for_argument(size_t argument_index) = 0;
            virtual float float_for_argument(size_t argument_index) = 0;
            virtual double double_for_argument(size_t argument_index) = 0;
            virtual std::string string_for_argument(size_t argument_index) = 0;
            virtual DateTime datetime_for_argument(size_t argument_index) = 0;
            virtual size_t object_index_for_argument(size_t argument_index) = 0;
            virtual bool is_argument_null(size_t argument_index) = 0;
        };

        template<typename ValueType, typename ContextType>
        class ArgumentConverter : public Arguments
        {
          public:
            ArgumentConverter(ContextType context, std::vector<ValueType> arguments) : m_arguments(arguments), m_ctx(context) {};

            using Accessor = realm::NativeAccessor<ValueType, ContextType>;
            virtual bool bool_for_argument(size_t argument_index) { return Accessor::to_bool(m_ctx, argument_at(argument_index)); }
            virtual long long long_for_argument(size_t argument_index) { return Accessor::to_long(m_ctx, argument_at(argument_index)); }
            virtual float float_for_argument(size_t argument_index) { return Accessor::to_float(m_ctx, argument_at(argument_index)); }
            virtual double double_for_argument(size_t argument_index) { return Accessor::to_double(m_ctx, argument_at(argument_index)); }
            virtual std::string string_for_argument(size_t argument_index) { return Accessor::to_string(m_ctx, argument_at(argument_index)); }
            virtual DateTime datetime_for_argument(size_t argument_index) { return Accessor::to_datetime(m_ctx, argument_at(argument_index)); }
            virtual size_t object_index_for_argument(size_t argument_index) { return Accessor::to_existing_object_index(m_ctx, argument_at(argument_index)); }
            virtual bool is_argument_null(size_t argument_index) { return Accessor::is_null(m_ctx, argument_at(argument_index)); }

          private:
            std::vector<ValueType> m_arguments;
            ContextType m_ctx;

            ValueType &argument_at(size_t index) {
                if (index >= m_arguments.size()) {
                    throw std::out_of_range((std::string)"Argument index " + std::to_string(index) + " out of range 0.." + std::to_string(m_arguments.size()-1));
                }
                return m_arguments[index];
            }
        };
    }
}

#endif // REALM_QUERY_BUILDER_HPP