mirror of https://gitee.com/bigwinds/arangodb
134 lines
3.5 KiB
C++
134 lines
3.5 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 <velocypack/Slice.h>
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#include <velocypack/velocypack-aliases.h>
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namespace arangodb {
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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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_lastRevisionId(0),
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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._lastRevisionId);
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}
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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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_lastRevisionId = other._lastRevisionId;
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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._lastRevisionId);
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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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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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//add unmanaged vpack
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inline void setUnmanaged(uint8_t const* vpack, TRI_voc_rid_t revisionId) {
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if(_managed || _useString) {
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reset();
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}
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TRI_ASSERT(_length == 0);
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_vpack = const_cast<uint8_t*>(vpack);
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_lastRevisionId = revisionId;
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}
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inline void setManaged(uint8_t const* vpack, TRI_voc_rid_t revisionId) {
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VPackSlice slice(vpack);
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auto newLen = slice.byteSize();
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if (_length >= newLen && _managed){
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std::memcpy(_vpack, vpack, newLen);
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} else {
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reset();
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_vpack = new uint8_t[newLen];
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std::memcpy(_vpack, vpack, newLen);
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_length=newLen;
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}
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_lastRevisionId = revisionId;
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_managed = true;
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}
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inline void setManaged(std::string&& str, TRI_voc_rid_t revisionId) {
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reset();
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_string = std::move(str);
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_vpack = reinterpret_cast<uint8_t*>(const_cast<char *>(_string.data()));
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_lastRevisionId = revisionId;
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_useString = true;
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}
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inline TRI_voc_rid_t lastRevisionId() const { return _lastRevisionId; }
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void reset() noexcept {
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if(_managed) {
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delete _vpack;
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}
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_managed = false;
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_length = 0;
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if(_useString){
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_string.clear();
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}
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_useString = false;
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_lastRevisionId = 0;
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_vpack = nullptr;
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}
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private:
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uint64_t _length;
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TRI_voc_rid_t _lastRevisionId;
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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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