154 lines
3.6 KiB
C++
154 lines
3.6 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004-2009, University in Hagen, Faculty of Mathematics
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and Computer Science, Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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1 Array.h
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*/
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#pragma once
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#include "Algebras/CRel/ReadWrite.h"
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#include <vector>
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namespace ColumnMovingAlgebra {
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/*
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1.1 Declaration of class ~Array~
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This class extends ~std::vector~ by functions needed by attribut arrays for
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persistant storage.
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*/
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template<class T>
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class Array : public std::vector<T> {
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public:
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Array() = default;
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Array(size_t count);
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Array(CRelAlgebra::Reader& source);
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Array(CRelAlgebra::Reader& source, size_t count);
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void load(CRelAlgebra::Reader& source);
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void save(CRelAlgebra::Writer &target, bool includeHeader = true);
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int savedSize();
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int savedSize(int count);
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};
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/*
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1.1 Implementation of class ~Array~
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Constructor with size argument
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*/
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template<class T>
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inline Array<T>::Array(size_t count) : std::vector<T>(count)
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{
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}
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/*
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constructor loading the array from persistant storage.
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*/
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template<class T>
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inline Array<T>::Array(CRelAlgebra::Reader& source)
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{
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size_t count;
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source.ReadOrThrow(reinterpret_cast<char*>(&count), sizeof(size_t));
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std::vector<T>::resize(count);
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source.ReadOrThrow(reinterpret_cast<char*>(std::vector<T>::data()),
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count * sizeof(T));
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}
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/*
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constructor loading the array with known size from persistant storage-
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*/
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template<class T>
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inline Array<T>::Array(CRelAlgebra::Reader& source, size_t count)
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{
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std::vector<T>::resize(count);
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source.ReadOrThrow(reinterpret_cast<char*>(std::vector<T>::data()),
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count * sizeof(T));
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}
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/*
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function loading the array from persistant storage.
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*/
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template<class T>
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inline void Array<T>::load(CRelAlgebra::Reader& source)
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{
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size_t count;
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source.ReadOrThrow(reinterpret_cast<char*>(&count), sizeof(size_t));
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std::vector<T>::resize(count);
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source.ReadOrThrow(reinterpret_cast<char*>(std::vector<T>::data()),
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count * sizeof(T));
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}
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/*
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saving the array from persistant storage.
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*/
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template<class T>
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inline void Array<T>::save(CRelAlgebra::Writer &target,
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bool includeHeader)
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{
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if (includeHeader) {
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size_t count = std::vector<T>::size();
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target.WriteOrThrow(reinterpret_cast<char*>(&count), sizeof(size_t));
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}
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target.WriteOrThrow(reinterpret_cast<char*>(std::vector<T>::data()),
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std::vector<T>::size() * sizeof(T));
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}
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/*
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returns the size needed for persistant storage of this instance
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*/
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template<class T>
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inline int Array<T>::savedSize() {
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return sizeof(size_t) + sizeof(T) * std::vector<T>::size();
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}
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/*
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returns the size needed for persistant storage for an array with containing
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~count~ elements
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*/
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template<class T>
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inline int Array<T>::savedSize(int count) {
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return sizeof(size_t) + sizeof(T) * count;
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}
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}
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