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https://bitbucket.org/smil3y/katie.git
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QAbstractFileEngine and QAbstractFileEngineIterator documentation update
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev
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2 changed files with 39 additions and 113 deletions
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@ -3,7 +3,7 @@
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# https://wiki.archlinux.org/index.php/Arch_package_guidelines
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pkgname=katie-git
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pkgver=4.12.0.r7583.cd4c21f81
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pkgver=4.12.0.r7589.f23acad20
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pkgrel=1
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pkgdesc='C++ toolkit derived from the Qt 4.8 framework'
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arch=('i486' 'i686' 'pentium4' 'x86_64' 'arm')
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@ -144,13 +144,6 @@ bool QAbstractFileEnginePrivate::unmap(uchar *ptr)
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/*!
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Creates and returns a QAbstractFileEngine suitable for processing \a
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fileName.
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You should not need to call this function; use QFile, QFileInfo or
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QDir directly instead.
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If you reimplemnt this function, it should only return file
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engines that knows how to handle \a fileName; otherwise, it should
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return 0.
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*/
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QAbstractFileEngine *QAbstractFileEngine::create(const QString &fileName)
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{
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@ -503,8 +496,6 @@ bool QAbstractFileEngine::isSequential() const
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Requests that the file is deleted from the file system. If the
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operation succeeds return true; otherwise return false.
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This virtual function must be reimplemented by all subclasses.
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\sa setFileName() rmdir()
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*/
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bool QAbstractFileEngine::remove()
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@ -539,8 +530,6 @@ bool QAbstractFileEngine::copy(const QString &newName)
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system. If the operation succeeds return true; otherwise return
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false.
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This virtual function must be reimplemented by all subclasses.
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\sa setFileName()
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*/
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bool QAbstractFileEngine::rename(const QString &newName)
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@ -581,8 +570,6 @@ bool QAbstractFileEngine::link(const QString &newName)
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succeed. If the operation succeeds return true; otherwise return
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false.
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This virtual function must be reimplemented by all subclasses.
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\sa setFileName() rmdir() isRelativePath()
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*/
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bool QAbstractFileEngine::mkdir(const QString &dirName, bool createParentDirectories) const
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@ -599,8 +586,6 @@ bool QAbstractFileEngine::mkdir(const QString &dirName, bool createParentDirecto
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using this function if it is non-empty. If the operation succeeds
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return true; otherwise return false.
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This virtual function must be reimplemented by all subclasses.
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\sa setFileName() remove() mkdir() isRelativePath()
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*/
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bool QAbstractFileEngine::rmdir(const QString &dirName, bool recurseParentDirectories) const
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@ -614,8 +599,6 @@ bool QAbstractFileEngine::rmdir(const QString &dirName, bool recurseParentDirect
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simply truncated. If the operations succceeds return true; otherwise
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return false;
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This virtual function must be reimplemented by all subclasses.
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\sa size()
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*/
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bool QAbstractFileEngine::setSize(qint64 size)
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@ -639,8 +622,6 @@ bool QAbstractFileEngine::setSize(qint64 size)
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Return true if the file referred to by this file engine has a
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relative path; otherwise return false.
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This virtual function must be reimplemented by all subclasses.
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\sa setFileName()
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*/
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bool QAbstractFileEngine::isRelativePath() const
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@ -658,8 +639,6 @@ bool QAbstractFileEngine::isRelativePath() const
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rather than a directory, or if the directory is unreadable or does
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not exist or if nothing matches the specifications.
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This virtual function must be reimplemented by all subclasses.
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\sa setFileName()
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*/
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QStringList QAbstractFileEngine::entryList(QDir::Filters filters, const QStringList &filterNames) const
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@ -674,17 +653,8 @@ QStringList QAbstractFileEngine::entryList(QDir::Filters filters, const QStringL
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}
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/*!
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This function should return the set of OR'd flags that are true
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for the file engine's file, and that are in the \a type's OR'd
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members.
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In your reimplementation you can use the \a type argument as an
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optimization hint and only return the OR'd set of members that are
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true and that match those in \a type; in other words you can
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ignore any members not mentioned in \a type, thus avoiding some
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potentially expensive lookups or system calls.
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This virtual function must be reimplemented by all subclasses.
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Return the set of OR'd flags that are true for the file engine's
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file, and that are in the \a type's OR'd members.
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\sa setFileName()
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*/
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@ -753,8 +723,6 @@ QAbstractFileEngine::FileFlags QAbstractFileEngine::fileFlags(FileFlags type) co
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honored. If the operations succceeds return true; otherwise return
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false;
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This virtual function must be reimplemented by all subclasses.
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\sa size()
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*/
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bool QAbstractFileEngine::setPermissions(uint perms)
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@ -776,8 +744,6 @@ bool QAbstractFileEngine::setPermissions(uint perms)
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file name set in setFileName() when an unhandled format is
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requested.
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This virtual function must be reimplemented by all subclasses.
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\sa setFileName(), FileName
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*/
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QString QAbstractFileEngine::fileName(FileName file) const
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@ -815,8 +781,6 @@ QString QAbstractFileEngine::fileName(FileName file) const
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the file. If \a owner is \c OwnerGroup return the ID of the group
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that own the file. If you can't determine the owner return -2.
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This virtual function must be reimplemented by all subclasses.
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\sa owner() setFileName(), FileOwner
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*/
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uint QAbstractFileEngine::ownerId(FileOwner owner) const
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@ -838,8 +802,6 @@ uint QAbstractFileEngine::ownerId(FileOwner owner) const
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that own the file. If you can't determine the owner return
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QString().
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This virtual function must be reimplemented by all subclasses.
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\sa ownerId() setFileName(), FileOwner
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*/
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QString QAbstractFileEngine::owner(FileOwner owner) const
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@ -857,8 +819,6 @@ QString QAbstractFileEngine::owner(FileOwner owner) const
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If the time cannot be determined return QDateTime() (an invalid
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date time).
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This virtual function must be reimplemented by all subclasses.
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\sa setFileName(), QDateTime, QDateTime::isValid(), FileTime
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*/
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QDateTime QAbstractFileEngine::fileTime(FileTime time) const
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@ -881,9 +841,7 @@ QDateTime QAbstractFileEngine::fileTime(FileTime time) const
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/*!
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Sets the file engine's file name to \a file. This file name is the
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file that the rest of the virtual functions will operate on.
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This virtual function must be reimplemented by all subclasses.
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file that the rest of the functions will operate on.
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\sa rename()
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*/
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@ -912,10 +870,6 @@ int QAbstractFileEngine::handle() const
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Returns a pointer to the memory if successful; otherwise returns false
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if, for example, an error occurs.
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This function bases its behavior on calling extension() with
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MapExtensionOption. If the engine does not support this extension, 0 is
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returned.
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\sa unmap(), supportsExtension()
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*/
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@ -936,10 +890,6 @@ uchar *QAbstractFileEngine::map(qint64 offset, qint64 size)
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Unmaps the memory \a address. Returns true if the unmap succeeds; otherwise
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returns false.
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This function bases its behavior on calling extension() with
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UnMapExtensionOption. If the engine does not support this extension, false is
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returned.
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\sa map(), supportsExtension()
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*/
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bool QAbstractFileEngine::unmap(uchar *address)
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@ -1049,9 +999,9 @@ qint64 QAbstractFileEngine::write(const char *data, qint64 len)
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}
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/*!
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This function reads one line, terminated by a '\n' character, from the
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file info \a data. At most \a maxlen characters will be read. The
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end-of-line character is included.
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Reads one line, terminated by a '\n' character, from the file info
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\a data. At most \a maxlen characters will be read. The end-of-line
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character is included.
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*/
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qint64 QAbstractFileEngine::readLine(char *data, qint64 maxlen)
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{
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@ -1115,10 +1065,8 @@ qint64 QAbstractFileEngine::readLine(char *data, qint64 maxlen)
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/*!
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\since 4.3
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This virtual function can be reimplemented in a QAbstractFileEngine
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subclass to provide support for extensions. The \a option argument is
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provided as input to the extension, and this function can store output
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results in \a output.
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The \a option argument is provided as input to the extension, and
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this function can store output results in \a output.
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The behavior of this function is determined by \a extension; see the
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Extension documentation for details.
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@ -1126,7 +1074,7 @@ qint64 QAbstractFileEngine::readLine(char *data, qint64 maxlen)
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You can call supportsExtension() to check if an extension is supported by
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the file engine.
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By default, no extensions are supported, and this function returns false.
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By default, map and unmap extensions are supported.
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\sa supportsExtension(), Extension
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*/
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@ -1150,9 +1098,8 @@ bool QAbstractFileEngine::extension(Extension extension, const ExtensionOption *
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/*!
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\since 4.3
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This virtual function returns true if the file engine supports \a
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extension; otherwise, false is returned. By default, no extensions are
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supported.
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Returns true if the file engine supports \a extension; otherwise, false
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is returned. By default map, unmap and fast readline extensions are supported.
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\sa extension()
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*/
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@ -1194,8 +1141,6 @@ QString QAbstractFileEngine::errorString() const
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/*!
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Sets the error type to \a error, and the error string to \a errorString.
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Call this function to set the error values returned by the higher-level
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classes.
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\sa QFile::error(), QIODevice::errorString(), QIODevice::setErrorString()
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*/
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@ -1249,7 +1194,6 @@ bool QAbstractFileEngine::open(QIODevice::OpenMode openMode, int fd, QFile::File
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return true;
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}
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QString QAbstractFileEngine::currentPath(const QString &)
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{
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return QFileSystemEngine::currentPath().filePath();
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@ -1274,48 +1218,33 @@ QString QAbstractFileEngine::tempPath()
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\since 4.3
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\class QAbstractFileEngineIterator
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\brief The QAbstractFileEngineIterator class provides an iterator
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interface for custom file engines.
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interface for file engines.
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If all you want is to iterate over entries in a directory, see
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QDirIterator instead. This class is only for custom file engine authors.
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QDirIterator instead. This class is only for internal file engines.
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QAbstractFileEngineIterator is a unidirectional single-use virtual
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iterator that plugs into QDirIterator, providing transparent proxy
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iteration for custom file engines.
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You can subclass QAbstractFileEngineIterator to provide an iterator when
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writing your own file engine. To plug the iterator into your file system,
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you simply return an instance of this subclass from a reimplementation of
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QAbstractFileEngine::beginEntryList().
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Example:
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\snippet doc/src/snippets/code/src_corelib_io_qabstractfileengine.cpp 2
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QAbstractFileEngineIterator is a unidirectional single-use iterator
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that plugs into QDirIterator, providing transparent proxy iteration for
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file engines.
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QAbstractFileEngineIterator is associated with a path, name filters, and
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entry filters. The path is the directory that the iterator lists entries
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in. The name filters and entry filters are provided for file engines that
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can optimize directory listing at the iterator level (e.g., network file
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systems that need to minimize network traffic), but they can also be
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ignored by the iterator subclass; QAbstractFileEngineIterator already
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provides the required filtering logics in the matchesFilters() function.
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You can call dirName() to get the directory name, nameFilters() to get a
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stringlist of name filters, and filters() to get the entry filters.
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ignored by the iterator; QAbstractFileEngineIterator already provides the
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required filtering logics in the matchesFilters() function. You can call
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dirName() to get the directory name, nameFilters() to get a stringlist of
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name filters, and filters() to get the entry filters.
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The pure virtual function hasNext() returns true if the current directory
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has at least one more entry (i.e., the directory name is valid and
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accessible, and we have not reached the end of the entry list), and false
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otherwise. Reimplement next() to seek to the next entry.
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The function hasNext() returns true if the current directory has at least
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one more entry (i.e., the directory name is valid and accessible, and we
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have not reached the end of the entry list), and false otherwise.
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next() seeks to the next entry.
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The pure virtual function currentFileName() returns the name of the
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current entry without advancing the iterator. The currentFilePath()
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function is provided for convenience; it returns the full path of the
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current entry.
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Here is an example of how to implement an iterator that returns each of
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three fixed entries in sequence.
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\snippet doc/src/snippets/code/src_corelib_io_qabstractfileengine.cpp 3
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The function currentFileName() returns the name of the current entry
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without advancing the iterator. The currentFilePath() function is
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provided for convenience; it returns the full path of the current entry.
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Note: QAbstractFileEngineIterator does not deal with QDir::IteratorFlags;
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it simply returns entries for a single directory.
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@ -1449,8 +1378,7 @@ QDir::Filters QAbstractFileEngineIterator::filters() const
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}
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/*!
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This pure virtual function returns the name of the current directory
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entry, excluding the path.
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Returns the name of the current directory entry, excluding the path.
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\sa currentFilePath()
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*/
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@ -1484,11 +1412,11 @@ QString QAbstractFileEngineIterator::currentFilePath() const
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}
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/*!
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The virtual function returns a QFileInfo for the current directory
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entry. This function is provided for convenience. It can also be slightly
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faster than creating a QFileInfo object yourself, as the object returned
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by this function might contain cached information that QFileInfo otherwise
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would have to access through the file engine.
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Returns a QFileInfo for the current directory entry. This function is
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provided for convenience. It can also be slightly faster than creating a
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QFileInfo object yourself, as the object returned by this function might
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contain cached information that QFileInfo otherwise would have to access
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through the file engine.
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\sa currentFileName()
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*/
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@ -1502,14 +1430,12 @@ QFileInfo QAbstractFileEngineIterator::currentFileInfo() const
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}
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/*!
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This pure virtual function advances the iterator to the next directory
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entry, and returns the file path to the current entry.
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Advances the iterator to the next directory entry, and returns the file
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path to the current entry.
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This function can optionally make use of nameFilters() and filters() to
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optimize its performance.
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Reimplement this function in a subclass to advance the iterator.
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\sa QDirIterator::next()
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*/
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QString QAbstractFileEngineIterator::next()
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@ -1526,9 +1452,9 @@ QString QAbstractFileEngineIterator::next()
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}
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/*!
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This pure virtual function returns true if there is at least one more
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entry in the current directory (i.e., the iterator path is valid and
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accessible, and the iterator has not reached the end of the entry list).
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Returns true if there is at least one more entry in the current
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directory (i.e., the iterator path is valid and accessible, and the
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iterator has not reached the end of the entry list).
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\sa QDirIterator::hasNext()
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*/
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