mirror of https://gitee.com/bigwinds/arangodb
138 lines
4.7 KiB
C++
138 lines
4.7 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Aql, expression
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 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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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2012-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "Aql/Expression.h"
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#include "Aql/AqlValue.h"
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#include "Aql/Ast.h"
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#include "Aql/Types.h"
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#include "Aql/V8Executor.h"
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#include "Aql/V8Expression.h"
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#include "Aql/Variable.h"
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#include "Basics/JsonHelper.h"
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#include "BasicsC/json.h"
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#include "Utils/Exception.h"
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using namespace triagens::aql;
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using Json = triagens::basics::Json;
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the expression
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////////////////////////////////////////////////////////////////////////////////
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Expression::Expression (V8Executor* executor,
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AstNode const* node)
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: _executor(executor),
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_node(node),
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_type(UNPROCESSED) {
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TRI_ASSERT(_executor != nullptr);
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TRI_ASSERT(_node != nullptr);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the expression
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////////////////////////////////////////////////////////////////////////////////
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Expression::~Expression () {
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if (_type == V8) {
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delete _func;
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}
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else if (_type == JSON) {
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TRI_ASSERT(_data != nullptr);
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TRI_FreeJson(TRI_UNKNOWN_MEM_ZONE, _data);
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// _json is freed automatically by AqlItemBlock
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}
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return all variables used in the expression
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////////////////////////////////////////////////////////////////////////////////
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std::unordered_set<Variable*> Expression::variables () const {
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return Ast::getReferencedVariables(_node);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief execute the expression
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////////////////////////////////////////////////////////////////////////////////
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AqlValue Expression::execute (AQL_TRANSACTION_V8* trx,
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std::vector<TRI_document_collection_t const*>& docColls,
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std::vector<AqlValue>& argv,
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size_t startPos,
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std::vector<Variable*> const& vars,
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std::vector<RegisterId> const& regs) {
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if (_type == UNPROCESSED) {
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if (_node->isConstant()) {
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// generate a constant value
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_data = _node->toJsonValue(TRI_UNKNOWN_MEM_ZONE);
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if (_data == nullptr) {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_INTERNAL);
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}
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_type = JSON;
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}
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else {
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// generate a V8 expression
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_func = _executor->generateExpression(_node);
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_type = V8;
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}
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}
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// and execute
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if (_type == JSON) {
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TRI_ASSERT(_data != nullptr);
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return AqlValue(new Json(TRI_UNKNOWN_MEM_ZONE, _data, Json::NOFREE));
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}
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if (_type == V8) {
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return _func->execute(trx, docColls, argv, startPos, vars, regs);
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}
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THROW_ARANGO_EXCEPTION(TRI_ERROR_INTERNAL);
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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