[3365] | 1 | /**************************************************************************
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| 2 | *
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| 3 | * QueryResultsSort.h -- Functions to sort query results and parallel data
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| 4 | * Copyright (C) 1999 Rodger McNab
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License as published by
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| 8 | * the Free Software Foundation; either version 2 of the License, or
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| 9 | * (at your option) any later version.
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| 10 | *
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| 11 | * This program is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | * GNU General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU General Public License
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| 17 | * along with this program; if not, write to the Free Software
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| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 19 | *
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| 20 | **************************************************************************/
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| 21 |
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| 22 | #ifndef QUERYRESULTSSORT_H
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| 23 | #define QUERYRESULTSSORT_H
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| 24 |
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| 25 | #include "Terms.h"
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| 26 |
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| 27 |
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| 28 | struct LTRank {
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| 29 | bool operator()(const float &f1, const float &f2) const
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| 30 | { return (f1 < f2); }
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| 31 | };
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| 32 |
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| 33 | struct GTRank {
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| 34 | bool operator()(const float &f1, const float &f2) const
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| 35 | { return (f1 > f2); }
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| 36 | };
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| 37 |
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| 38 |
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| 39 |
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| 40 | // assumes the rank vector is the same size as the document
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| 41 | // number vector. assumes the value to be pushed is in
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| 42 | // docNumHeap + heapSize - 1 and rankHeap + heapSize - 1
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| 43 | // topIndex can be set
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| 44 | template <class RandomAccessIterator, class Compare>
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| 45 | void PushHeap (DocNumArray::iterator docNumHeap,
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| 46 | RandomAccessIterator parallelHeap,
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[23508] | 47 | mg_u_long heapSize,
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[3365] | 48 | const Compare &comp) {
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[23508] | 49 | mg_u_long holeIndex = heapSize-1;
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| 50 | mg_u_long parent = (holeIndex - 1) / 2;
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[3365] | 51 | while (holeIndex > 0 && comp (*(parallelHeap+parent),
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| 52 | *(parallelHeap+holeIndex))) {
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| 53 | swap (*(parallelHeap+holeIndex), *(parallelHeap+parent));
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| 54 | swap (*(docNumHeap+holeIndex), *(docNumHeap+parent));
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| 55 | holeIndex = parent;
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| 56 | parent = (holeIndex - 1) / 2;
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| 57 | }
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| 58 | }
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| 59 |
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| 60 | // AdjustHeap is used to add a element to a heap after one
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| 61 | // element in the heap has been replaced with a new one
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| 62 | template <class RandomAccessIterator, class Compare>
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| 63 | void AdjustHeap (DocNumArray::iterator docNumHeap,
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| 64 | RandomAccessIterator parallelHeap,
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[23508] | 65 | mg_u_long holeIndex,
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| 66 | mg_u_long heapSize,
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[3365] | 67 | const Compare &comp) {
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[23508] | 68 | mg_u_long secondChild = 2 * holeIndex + 2;
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[3365] | 69 | while (secondChild < heapSize) {
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| 70 | if (comp(*(parallelHeap + secondChild),
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| 71 | *(parallelHeap + (secondChild - 1))))
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[9613] | 72 | --secondChild;
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[3365] | 73 | swap (*(parallelHeap+holeIndex), *(parallelHeap+secondChild));
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| 74 | swap (*(docNumHeap+holeIndex), *(docNumHeap+secondChild));
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| 75 | holeIndex = secondChild;
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| 76 | secondChild = 2 * secondChild + 2;
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| 77 | }
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| 78 | if (secondChild == heapSize) {
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| 79 | swap (*(parallelHeap+holeIndex), *(parallelHeap+(secondChild-1)));
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| 80 | swap (*(docNumHeap+holeIndex), *(docNumHeap+(secondChild-1)));
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| 81 | holeIndex = secondChild - 1;
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| 82 | }
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| 83 | PushHeap (docNumHeap, parallelHeap, holeIndex+1, comp);
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| 84 | }
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| 85 |
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| 86 | template <class RandomAccessIterator, class Compare>
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| 87 | void PopHeap (DocNumArray::iterator docNumHeap,
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| 88 | RandomAccessIterator parallelHeap,
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[23508] | 89 | mg_u_long heapSize,
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[3365] | 90 | const Compare &comp) {
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| 91 | swap (*(parallelHeap), *(parallelHeap+heapSize-1));
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| 92 | swap (*(docNumHeap), *(docNumHeap+heapSize-1));
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[23508] | 93 | AdjustHeap (docNumHeap, parallelHeap, (mg_u_long)0, heapSize-1, comp);
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[3365] | 94 | }
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| 95 |
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| 96 | template <class RandomAccessIterator, class Compare>
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| 97 | void MakeHeap (DocNumArray::iterator docNumHeap,
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| 98 | RandomAccessIterator parallelHeap,
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[23508] | 99 | mg_u_long size,
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[3365] | 100 | const Compare &comp) {
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| 101 | if (size < 2) return;
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| 102 |
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[23508] | 103 | mg_u_long i = 0;
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[9613] | 104 | for (i=1; i<=size; ++i)
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[3365] | 105 | PushHeap (docNumHeap, parallelHeap, i, comp);
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| 106 | }
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| 107 |
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| 108 |
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| 109 | template <class RandomAccessIterator, class Compare>
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| 110 | void SortHeap (DocNumArray::iterator docNumHeap,
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| 111 | RandomAccessIterator parallelHeap,
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[23508] | 112 | mg_u_long size,
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[3365] | 113 | const Compare &comp) {
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| 114 | if (size < 2) return;
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| 115 |
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[23508] | 116 | mg_u_long i;
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[9613] | 117 | for (i=size; i>1; --i)
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[3365] | 118 | PopHeap (docNumHeap, parallelHeap, i, comp);
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| 119 | }
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| 120 |
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| 121 | // uses the heap to get the top "size" elements
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| 122 | template <class RandomAccessIterator, class Compare>
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| 123 | void SelectAddHeap (DocNumArray::iterator docNumHeap,
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| 124 | RandomAccessIterator parallelHeap,
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[23508] | 125 | mg_u_long heapSize,
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[3365] | 126 | DocNumArray::iterator docNumAdd,
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| 127 | RandomAccessIterator parallelAdd,
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[23508] | 128 | mg_u_long addSize,
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[3365] | 129 | const Compare &comp) {
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[23508] | 130 | mg_u_long i;
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[9613] | 131 | for (i=0; i<addSize; ++i) {
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[3365] | 132 | if (comp(*(parallelAdd+i), *(parallelHeap))) {
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| 133 | swap (*(docNumHeap), *(docNumAdd+i));
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| 134 | swap (*(parallelHeap), *(parallelAdd+i));
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[23508] | 135 | AdjustHeap (docNumHeap, parallelHeap, (mg_u_long)0, heapSize, comp);
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[3365] | 136 | }
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| 137 | }
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| 138 | }
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| 139 |
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| 140 | #endif
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