1 | // Copyright (C) 2020 The Qt Company Ltd. |
---|---|
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
3 | |
4 | #include "qresultstore.h" |
5 | |
6 | QT_BEGIN_NAMESPACE |
7 | |
8 | namespace QtPrivate { |
9 | |
10 | /*! |
11 | \internal |
12 | |
13 | Finds result in \a store by \a index |
14 | */ |
15 | static ResultIteratorBase findResult(const QMap<int, ResultItem> &store, int index) |
16 | { |
17 | if (store.isEmpty()) |
18 | return ResultIteratorBase(store.end()); |
19 | QMap<int, ResultItem>::const_iterator it = store.lowerBound(key: index); |
20 | |
21 | // lowerBound returns either an iterator to the result or an iterator |
22 | // to the nearest greater index. If the latter happens it might be |
23 | // that the result is stored in a vector at the previous index. |
24 | if (it == store.end()) { |
25 | --it; |
26 | if (it.value().isVector() == false) { |
27 | return ResultIteratorBase(store.end()); |
28 | } |
29 | } else { |
30 | if (it.key() > index) { |
31 | if (it == store.begin()) |
32 | return ResultIteratorBase(store.end()); |
33 | --it; |
34 | } |
35 | } |
36 | |
37 | const int vectorIndex = index - it.key(); |
38 | |
39 | if (vectorIndex >= it.value().count()) |
40 | return ResultIteratorBase(store.end()); |
41 | else if (it.value().isVector() == false && vectorIndex != 0) |
42 | return ResultIteratorBase(store.end()); |
43 | return ResultIteratorBase(it, vectorIndex); |
44 | } |
45 | |
46 | /*! |
47 | \class QtPrivate::ResultItem |
48 | \internal |
49 | */ |
50 | |
51 | /*! |
52 | \class QtPrivate::ResultIteratorBase |
53 | \internal |
54 | */ |
55 | |
56 | /*! |
57 | \class QtPrivate::ResultStoreBase |
58 | \internal |
59 | */ |
60 | |
61 | ResultIteratorBase::ResultIteratorBase() |
62 | : mapIterator(QMap<int, ResultItem>::const_iterator()), m_vectorIndex(0) { } |
63 | ResultIteratorBase::ResultIteratorBase(QMap<int, ResultItem>::const_iterator _mapIterator, int _vectorIndex) |
64 | : mapIterator(_mapIterator), m_vectorIndex(_vectorIndex) { } |
65 | |
66 | int ResultIteratorBase::vectorIndex() const { return m_vectorIndex; } |
67 | int ResultIteratorBase::resultIndex() const { return mapIterator.key() + m_vectorIndex; } |
68 | |
69 | ResultIteratorBase ResultIteratorBase::operator++() |
70 | { |
71 | if (canIncrementVectorIndex()) { |
72 | ++m_vectorIndex; |
73 | } else { |
74 | ++mapIterator; |
75 | m_vectorIndex = 0; |
76 | } |
77 | return *this; |
78 | } |
79 | |
80 | int ResultIteratorBase::batchSize() const |
81 | { |
82 | return mapIterator.value().count(); |
83 | } |
84 | |
85 | void ResultIteratorBase::batchedAdvance() |
86 | { |
87 | ++mapIterator; |
88 | m_vectorIndex = 0; |
89 | } |
90 | |
91 | bool ResultIteratorBase::isVector() const |
92 | { |
93 | return mapIterator.value().isVector(); |
94 | } |
95 | |
96 | bool ResultIteratorBase::canIncrementVectorIndex() const |
97 | { |
98 | return (m_vectorIndex + 1 < mapIterator.value().m_count); |
99 | } |
100 | |
101 | bool ResultIteratorBase::isValid() const |
102 | { |
103 | return mapIterator.value().isValid(); |
104 | } |
105 | |
106 | ResultStoreBase::ResultStoreBase() |
107 | : insertIndex(0), resultCount(0), m_filterMode(false), filteredResults(0) { } |
108 | |
109 | ResultStoreBase::~ResultStoreBase() |
110 | { |
111 | // QFutureInterface's dtor must delete the contents of m_results. |
112 | Q_ASSERT(m_results.isEmpty()); |
113 | } |
114 | |
115 | void ResultStoreBase::setFilterMode(bool enable) |
116 | { |
117 | m_filterMode = enable; |
118 | } |
119 | |
120 | bool ResultStoreBase::filterMode() const |
121 | { |
122 | return m_filterMode; |
123 | } |
124 | |
125 | void ResultStoreBase::syncResultCount() |
126 | { |
127 | ResultIteratorBase it = resultAt(index: resultCount); |
128 | while (it != end()) { |
129 | resultCount += it.batchSize(); |
130 | it = resultAt(index: resultCount); |
131 | } |
132 | } |
133 | |
134 | void ResultStoreBase::insertResultItemIfValid(int index, ResultItem &resultItem) |
135 | { |
136 | if (resultItem.isValid()) { |
137 | m_results[index] = resultItem; |
138 | syncResultCount(); |
139 | } else { |
140 | filteredResults += resultItem.count(); |
141 | } |
142 | } |
143 | |
144 | int ResultStoreBase::insertResultItem(int index, ResultItem &resultItem) |
145 | { |
146 | int storeIndex; |
147 | if (m_filterMode && index != -1 && index > insertIndex) { |
148 | pendingResults[index] = resultItem; |
149 | storeIndex = index; |
150 | } else { |
151 | storeIndex = updateInsertIndex(index, count: resultItem.count()); |
152 | insertResultItemIfValid(index: storeIndex - filteredResults, resultItem); |
153 | } |
154 | syncPendingResults(); |
155 | return storeIndex; |
156 | } |
157 | |
158 | bool ResultStoreBase::containsValidResultItem(int index) const |
159 | { |
160 | // index might refer to either visible or pending result |
161 | const bool inPending = m_filterMode && index != -1 && index > insertIndex; |
162 | const auto &store = inPending ? pendingResults : m_results; |
163 | auto it = findResult(store, index); |
164 | return it != ResultIteratorBase(store.end()) && it.isValid(); |
165 | } |
166 | |
167 | void ResultStoreBase::syncPendingResults() |
168 | { |
169 | // check if we can insert any of the pending results: |
170 | QMap<int, ResultItem>::iterator it = pendingResults.begin(); |
171 | while (it != pendingResults.end()) { |
172 | int index = it.key(); |
173 | if (index != resultCount + filteredResults) |
174 | break; |
175 | |
176 | ResultItem result = it.value(); |
177 | insertResultItemIfValid(index: index - filteredResults, resultItem&: result); |
178 | pendingResults.erase(it); |
179 | it = pendingResults.begin(); |
180 | } |
181 | } |
182 | |
183 | int ResultStoreBase::addResult(int index, const void *result) |
184 | { |
185 | ResultItem resultItem(result, 0); // 0 means "not a vector" |
186 | return insertResultItem(index, resultItem); |
187 | } |
188 | |
189 | int ResultStoreBase::addResults(int index, const void *results, int vectorSize, int totalCount) |
190 | { |
191 | if (m_filterMode == false || vectorSize == totalCount) { |
192 | Q_ASSERT(vectorSize != 0); |
193 | ResultItem resultItem(results, vectorSize); |
194 | return insertResultItem(index, resultItem); |
195 | } else { |
196 | if (vectorSize > 0) { |
197 | ResultItem filteredIn(results, vectorSize); |
198 | insertResultItem(index, resultItem&: filteredIn); |
199 | } |
200 | ResultItem filteredAway(nullptr, totalCount - vectorSize); |
201 | return insertResultItem(index: index + vectorSize, resultItem&: filteredAway); |
202 | } |
203 | } |
204 | |
205 | ResultIteratorBase ResultStoreBase::begin() const |
206 | { |
207 | return ResultIteratorBase(m_results.begin()); |
208 | } |
209 | |
210 | ResultIteratorBase ResultStoreBase::end() const |
211 | { |
212 | return ResultIteratorBase(m_results.end()); |
213 | } |
214 | |
215 | bool ResultStoreBase::hasNextResult() const |
216 | { |
217 | return begin() != end(); |
218 | } |
219 | |
220 | ResultIteratorBase ResultStoreBase::resultAt(int index) const |
221 | { |
222 | return findResult(store: m_results, index); |
223 | } |
224 | |
225 | bool ResultStoreBase::contains(int index) const |
226 | { |
227 | return (resultAt(index) != end()); |
228 | } |
229 | |
230 | int ResultStoreBase::count() const |
231 | { |
232 | return resultCount; |
233 | } |
234 | |
235 | // returns the insert index, calling this function with |
236 | // index equal to -1 returns the next available index. |
237 | int ResultStoreBase::updateInsertIndex(int index, int _count) |
238 | { |
239 | if (index == -1) { |
240 | index = insertIndex; |
241 | insertIndex += _count; |
242 | } else { |
243 | insertIndex = qMax(a: index + _count, b: insertIndex); |
244 | } |
245 | return index; |
246 | } |
247 | |
248 | } // namespace QtPrivate |
249 | |
250 | QT_END_NAMESPACE |
251 |
Definitions
- findResult
- ResultIteratorBase
- ResultIteratorBase
- vectorIndex
- resultIndex
- operator++
- batchSize
- batchedAdvance
- isVector
- canIncrementVectorIndex
- isValid
- ResultStoreBase
- ~ResultStoreBase
- setFilterMode
- filterMode
- syncResultCount
- insertResultItemIfValid
- insertResultItem
- containsValidResultItem
- syncPendingResults
- addResult
- addResults
- begin
- end
- hasNextResult
- resultAt
- contains
- count
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