annotate Framework/Loaders/BasicFetchingItemsSorter.cpp @ 1270:2d8ab34c8c91

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 31 Jan 2020 17:34:29 +0100
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "BasicFetchingItemsSorter.h"
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23
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24 #include <Core/OrthancException.h>
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25
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26 namespace OrthancStone
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27 {
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28 BasicFetchingItemsSorter::BasicFetchingItemsSorter(unsigned int itemsCount) :
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29 itemsCount_(itemsCount)
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30 {
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31 if (itemsCount == 0)
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32 {
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33 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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34 }
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35 }
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37
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38 void BasicFetchingItemsSorter::Sort(std::vector<unsigned int>& target,
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39 unsigned int current)
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40 {
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41 if (current >= itemsCount_)
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42 {
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43 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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44 }
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45
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46 target.clear();
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47 target.reserve(itemsCount_);
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48 target.push_back(current);
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49
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50 const unsigned int countBelow = current;
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51 const unsigned int countAbove = (itemsCount_ - 1) - current;
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52 const unsigned int n = std::min(countBelow, countAbove);
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53
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54 for (unsigned int i = 1; i <= n; i++)
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55 {
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56 assert(current + i < itemsCount_ &&
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57 current >= i);
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58 target.push_back(current + i);
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59 target.push_back(current - i);
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60 }
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61
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62 for (unsigned int i = current - n; i > 0; i--)
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63 {
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64 target.push_back(i - 1);
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65 }
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66
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67 for (unsigned int i = current + n + 1; i < itemsCount_; i++)
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68 {
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69 target.push_back(i);
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70 }
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71
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72 assert(target.size() == itemsCount_);
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73 }
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74 }