mirror of https://gitee.com/bigwinds/arangodb
118 lines
3.2 KiB
C++
118 lines
3.2 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_VOC_BASE_MANAGED_DOCUMENT_RESULT_H
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#define ARANGOD_VOC_BASE_MANAGED_DOCUMENT_RESULT_H 1
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#include "Basics/Common.h"
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#include "VocBase/LocalDocumentId.h"
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#include "VocBase/voc-types.h"
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namespace arangodb {
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namespace velocypack {
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class Builder;
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}
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namespace aql {
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struct AqlValue;
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}
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class ManagedDocumentResult {
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public:
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ManagedDocumentResult() :
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_length(0),
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_localDocumentId(),
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_vpack(nullptr),
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_managed(false),
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_useString(false) {}
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~ManagedDocumentResult() { reset(); }
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ManagedDocumentResult(ManagedDocumentResult const& other) = delete;
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ManagedDocumentResult& operator=(ManagedDocumentResult const& other) = delete;
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ManagedDocumentResult& operator=(ManagedDocumentResult&& other) {
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if (other._useString) {
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setManaged(std::move(other._string), other._localDocumentId);
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other._managed = false;
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other.reset();
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} else if (other._managed){
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reset();
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_vpack = other._vpack;
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_length = other._length;
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_localDocumentId = other._localDocumentId;
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_managed = true;
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other._managed = false;
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other.reset();
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} else {
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setUnmanaged(other._vpack, other._localDocumentId);
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}
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return *this;
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}
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ManagedDocumentResult(ManagedDocumentResult&& other) = delete;
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void clone(ManagedDocumentResult& cloned) const;
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//add unmanaged vpack
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void setUnmanaged(uint8_t const* vpack, LocalDocumentId const& documentId);
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void setManaged(uint8_t const* vpack, LocalDocumentId const& documentId);
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void setManaged(std::string&& str, LocalDocumentId const& documentId);
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inline LocalDocumentId localDocumentId() const { return _localDocumentId; }
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void reset() noexcept;
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std::string* prepareStringUsage() {
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reset();
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_useString = true;
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return &_string;
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}
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void setManagedAfterStringUsage(LocalDocumentId const& documentId);
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inline uint8_t const* vpack() const {
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TRI_ASSERT(_vpack != nullptr);
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return _vpack;
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}
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inline bool empty() const { return _vpack == nullptr; }
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inline bool canUseInExternal() const {
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return (!_managed && !_useString);
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}
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void addToBuilder(velocypack::Builder& builder, bool allowExternals) const;
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private:
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uint64_t _length;
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LocalDocumentId _localDocumentId;
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uint8_t* _vpack;
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std::string _string;
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bool _managed;
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bool _useString;
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};
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}
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#endif
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