mirror of https://gitee.com/bigwinds/arangodb
125 lines
4.0 KiB
C++
125 lines
4.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_FUNCTION_H
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#define ARANGOD_AQL_FUNCTION_H 1
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#include "Basics/Common.h"
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#include "Aql/Functions.h"
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namespace arangodb {
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namespace aql {
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struct Function {
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enum Conversion { CONVERSION_NONE, CONVERSION_OPTIONAL, CONVERSION_REQUIRED };
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Function() = delete;
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/// @brief create the function
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Function(std::string const& externalName, std::string const& internalName,
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std::string const& arguments, bool isCacheable, bool isDeterministic,
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bool canThrow, bool canRunOnDBServer,
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bool canPassArgumentsByReference,
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FunctionImplementation implementation = nullptr,
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ExecutionCondition = nullptr);
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/// @brief destroy the function
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~Function();
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/// @brief checks if the function has been deprecated
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inline bool isDeprecated() const {
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// currently there are no deprecated functions
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return false;
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}
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/// @brief return the number of required arguments
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inline std::pair<size_t, size_t> numArguments() const {
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return std::make_pair(minRequiredArguments, maxRequiredArguments);
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}
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/// @brief whether or not a positional argument needs to be converted from a
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/// collection parameter to a collection name parameter
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inline Conversion getArgumentConversion(size_t position) const {
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if (position >= conversions.size()) {
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return CONVERSION_NONE;
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}
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return conversions[position];
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}
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/// @brief parse the argument list and set the minimum and maximum number of
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/// arguments
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void initializeArguments();
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/// @brief function name (name used in JavaScript implementation)
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std::string const internalName;
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/// @brief function name (name visible to the end user)
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std::string const externalName;
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/// @brief function arguments
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std::string const arguments;
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/// @brief whether or not the function results may be cached by the query
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/// cache
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bool const isCacheable;
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/// @brief whether or not the function is deterministic (i.e. its results are
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/// identical when called repeatedly with the same input values)
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bool const isDeterministic;
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/// @brief whether or not the function may throw a runtime exception
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bool const canThrow;
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/// @brief whether or not the function may be executed on DB servers
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bool const canRunOnDBServer;
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/// @brief whether or not the function can get its arguments passed by
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/// reference
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bool const canPassArgumentsByReference;
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/// @brief minimum number of required arguments
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size_t minRequiredArguments;
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/// @brief maximum number of required arguments
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size_t maxRequiredArguments;
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/// @brief C++ implementation of the function (maybe nullptr)
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FunctionImplementation implementation;
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/// @brief condition under which the C++ implementation of the function is
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/// executed (if returns false, the function will be executed as its
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/// JavaScript
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/// variant)
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ExecutionCondition condition;
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/// @brief function argument conversion information
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std::vector<Conversion> conversions;
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/// @brief maximum number of function arguments that can be used
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static size_t const MaxArguments = 65536;
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};
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}
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}
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#endif
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