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39
40#ifndef QFILEINFO_P_H
41#define QFILEINFO_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include "qfileinfo.h"
55#include "qdatetime.h"
56#include "qatomic.h"
57#include "qshareddata.h"
58#include "qfilesystemengine_p.h"
59
60#include <QtCore/private/qabstractfileengine_p.h>
61#include <QtCore/private/qfilesystementry_p.h>
62#include <QtCore/private/qfilesystemmetadata_p.h>
63
64#include <memory>
65
66QT_BEGIN_NAMESPACE
67
68class QFileInfoPrivate : public QSharedData
69{
70public:
71 enum {
72 // note: cachedFlags is only 30-bits wide
73 CachedFileFlags = 0x01,
74 CachedLinkTypeFlag = 0x02,
75 CachedBundleTypeFlag = 0x04,
76 CachedSize = 0x08,
77 CachedATime = 0x10,
78 CachedBTime = 0x20,
79 CachedMCTime = 0x40,
80 CachedMTime = 0x80,
81 CachedPerms = 0x100
82 };
83
84 inline QFileInfoPrivate()
85 : QSharedData(), fileEngine(nullptr),
86 cachedFlags(0),
87 isDefaultConstructed(true),
88 cache_enabled(true), fileFlags(0), fileSize(0)
89 {}
90 inline QFileInfoPrivate(const QFileInfoPrivate &copy)
91 : QSharedData(copy),
92 fileEntry(copy.fileEntry),
93 metaData(copy.metaData),
94 fileEngine(QFileSystemEngine::resolveEntryAndCreateLegacyEngine(entry&: fileEntry, data&: metaData)),
95 cachedFlags(0),
96#ifndef QT_NO_FSFILEENGINE
97 isDefaultConstructed(false),
98#else
99 isDefaultConstructed(!fileEngine),
100#endif
101 cache_enabled(copy.cache_enabled), fileFlags(0), fileSize(0)
102 {}
103 inline QFileInfoPrivate(const QString &file)
104 : fileEntry(QDir::fromNativeSeparators(pathName: file)),
105 fileEngine(QFileSystemEngine::resolveEntryAndCreateLegacyEngine(entry&: fileEntry, data&: metaData)),
106 cachedFlags(0),
107#ifndef QT_NO_FSFILEENGINE
108 isDefaultConstructed(file.isEmpty()),
109#else
110 isDefaultConstructed(!fileEngine),
111#endif
112 cache_enabled(true), fileFlags(0), fileSize(0)
113 {
114 }
115
116 inline QFileInfoPrivate(const QFileSystemEntry &file, const QFileSystemMetaData &data)
117 : QSharedData(),
118 fileEntry(file),
119 metaData(data),
120 fileEngine(QFileSystemEngine::resolveEntryAndCreateLegacyEngine(entry&: fileEntry, data&: metaData)),
121 cachedFlags(0),
122 isDefaultConstructed(false),
123 cache_enabled(true), fileFlags(0), fileSize(0)
124 {
125 //If the file engine is not null, this maybe a "mount point" for a custom file engine
126 //in which case we can't trust the metadata
127 if (fileEngine)
128 metaData = QFileSystemMetaData();
129 }
130
131 inline QFileInfoPrivate(const QFileSystemEntry &file, const QFileSystemMetaData &data, std::unique_ptr<QAbstractFileEngine> engine)
132 : fileEntry(file),
133 metaData(data),
134 fileEngine{std::move(engine)},
135 cachedFlags(0),
136#ifndef QT_NO_FSFILEENGINE
137 isDefaultConstructed(false),
138#else
139 isDefaultConstructed(!fileEngine),
140#endif
141 cache_enabled(true), fileFlags(0), fileSize(0)
142 {
143 }
144
145 inline void clearFlags() const {
146 fileFlags = 0;
147 cachedFlags = 0;
148 if (fileEngine)
149 (void)fileEngine->fileFlags(type: QAbstractFileEngine::Refresh);
150 }
151 inline void clear() {
152 metaData.clear();
153 clearFlags();
154 for (int i = QAbstractFileEngine::NFileNames - 1 ; i >= 0 ; --i)
155 fileNames[i].clear();
156 fileOwners[1].clear();
157 fileOwners[0].clear();
158 }
159
160 uint getFileFlags(QAbstractFileEngine::FileFlags) const;
161 QDateTime &getFileTime(QAbstractFileEngine::FileTime) const;
162 QString getFileName(QAbstractFileEngine::FileName) const;
163 QString getFileOwner(QAbstractFileEngine::FileOwner own) const;
164
165 QFileSystemEntry fileEntry;
166 mutable QFileSystemMetaData metaData;
167
168 std::unique_ptr<QAbstractFileEngine> const fileEngine;
169
170 mutable QString fileNames[QAbstractFileEngine::NFileNames];
171 mutable QString fileOwners[2]; // QAbstractFileEngine::FileOwner: OwnerUser and OwnerGroup
172 mutable QDateTime fileTimes[4]; // QAbstractFileEngine::FileTime: BirthTime, MetadataChangeTime, ModificationTime, AccessTime
173
174 mutable uint cachedFlags : 30;
175 bool const isDefaultConstructed : 1; // QFileInfo is a default constructed instance
176 bool cache_enabled : 1;
177 mutable uint fileFlags;
178 mutable qint64 fileSize;
179 inline bool getCachedFlag(uint c) const
180 { return cache_enabled ? (cachedFlags & c) : 0; }
181 inline void setCachedFlag(uint c) const
182 { if (cache_enabled) cachedFlags |= c; }
183
184 template <typename Ret, typename FSLambda, typename EngineLambda>
185 Ret checkAttribute(Ret defaultValue, QFileSystemMetaData::MetaDataFlags fsFlags, const FSLambda &fsLambda,
186 const EngineLambda &engineLambda) const
187 {
188 if (isDefaultConstructed)
189 return defaultValue;
190 if (fileEngine)
191 return engineLambda();
192 if (!cache_enabled || !metaData.hasFlags(flags: fsFlags)) {
193 QFileSystemEngine::fillMetaData(entry: fileEntry, data&: metaData, what: fsFlags);
194 // ignore errors, fillMetaData will have cleared the flags
195 }
196 return fsLambda();
197 }
198
199 template <typename Ret, typename FSLambda, typename EngineLambda>
200 Ret checkAttribute(QFileSystemMetaData::MetaDataFlags fsFlags, const FSLambda &fsLambda,
201 const EngineLambda &engineLambda) const
202 {
203 return checkAttribute(Ret(), fsFlags, fsLambda, engineLambda);
204 }
205};
206
207QT_END_NAMESPACE
208
209#endif // QFILEINFO_P_H
210

source code of qtbase/src/corelib/io/qfileinfo_p.h