mirror of https://gitee.com/bigwinds/arangodb
95 lines
3.1 KiB
C++
95 lines
3.1 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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#include "Variable.h"
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#include "Aql/Ast.h"
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#include "Aql/VariableGenerator.h"
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#include "Basics/VelocyPackHelper.h"
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#include <velocypack/Slice.h>
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#include <velocypack/velocypack-aliases.h>
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using namespace arangodb::aql;
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/// @brief name of $OLD variable
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char const* const Variable::NAME_OLD = "$OLD";
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/// @brief name of $NEW variable
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char const* const Variable::NAME_NEW = "$NEW";
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/// @brief name of $CURRENT variable
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char const* const Variable::NAME_CURRENT = "$CURRENT";
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/// @brief create the variable
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Variable::Variable(std::string const& name, VariableId id)
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: name(name), value(nullptr), id(id) {}
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Variable::Variable(arangodb::velocypack::Slice const& slice)
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: Variable(arangodb::basics::VelocyPackHelper::checkAndGetStringValue(
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slice, "name"),
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arangodb::basics::VelocyPackHelper::checkAndGetNumericValue<VariableId>(slice,
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"id")) {
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}
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/// @brief destroy the variable
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Variable::~Variable() {}
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/// @brief return a VelocyPack representation of the variable
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void Variable::toVelocyPack(VPackBuilder& builder) const {
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VPackObjectBuilder b(&builder);
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builder.add("id", VPackValue(static_cast<double>(id)));
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builder.add("name", VPackValue(name));
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}
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/// @brief replace a variable by another
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Variable const* Variable::replace(Variable const* variable,
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std::unordered_map<VariableId, Variable const*> const& replacements) {
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while (variable != nullptr) {
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auto it = replacements.find(variable->id);
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if (it != replacements.end()) {
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variable = (*it).second;
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} else {
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break;
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}
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}
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return variable;
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}
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/// @brief factory for (optional) variables from VPack
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Variable* Variable::varFromVPack(Ast* ast, arangodb::velocypack::Slice const& base,
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char const* variableName, bool optional) {
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VPackSlice variable = base.get(variableName);
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if (variable.isNone()) {
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if (optional) {
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return nullptr;
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}
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std::string msg;
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msg += "mandatory variable \"" + std::string(variableName) + "\" not found.";
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THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL, msg);
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}
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return ast->variables()->createVariable(variable);
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}
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