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tdelibs/tdecore/ksimpledirwatch.h

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/* This file is part of the KDE libraries
Copyright (C) 1998 Sven Radej <sven@lisa.exp.univie.ac.at>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef _KSIMPLEDIRWATCH_H
#define _KSIMPLEDIRWATCH_H
#include <tqtimer.h>
#include <tqdatetime.h>
#include <tqmap.h>
#include <tdelibs_export.h>
#define kdirwatch KSimpleDirWatch::self()
class KSimpleDirWatchPrivate;
/**
* KSimpleDirWatch is a basic copy of KDirWatch
* but with the KIO linking requirement removed
*
* Watch directories and files for changes.
* The watched directories or files don't have to exist yet.
*
* When a watched directory is changed, i.e. when files therein are
* created or deleted, KSimpleDirWatch will emit the signal dirty().
*
* When a watched, but previously not existing directory gets created,
* KSimpleDirWatch will emit the signal created().
*
* When a watched directory gets deleted, KSimpleDirWatch will emit the
* signal deleted(). The directory is still watched for new
* creation.
*
* When a watched file is changed, i.e. attributes changed or written
* to, KSimpleDirWatch will emit the signal dirty().
*
* Scanning of particular directories or files can be stopped temporarily
* and restarted. The whole class can be stopped and restarted.
* Directories and files can be added/removed from the list in any state.
*
* The implementation uses the FAM service when available;
* if FAM is not available, the DNOTIFY functionality is used on LINUX.
* As a last resort, a regular polling for change of modification times
* is done; the polling interval is a global config option:
* DirWatch/PollInterval and DirWatch/NFSPollInterval for NFS mounted
* directories.
*
* @see self()
* @short Class for watching directory and file changes.
* @author Sven Radej <sven@lisa.exp.univie.ac.at>
*/
class KIO_EXPORT KSimpleDirWatch : public TQObject
{
Q_OBJECT
public:
/**
* Constructor.
*
* Scanning begins immediately when a dir/file watch
* is added.
* @param parent the parent of the TQObject (or 0 for parent-less KDataTools)
* @param name the name of the TQObject, can be 0
*/
KSimpleDirWatch (TQObject* parent = 0, const char* name = 0);
/**
* Destructor.
*
* Stops scanning and cleans up.
*/
~KSimpleDirWatch();
/**
* Adds a directory to be watched.
*
* The directory does not have to exist. When @p watchFiles is
* false (the default), the signals dirty(), created(), deleted()
* can be emitted, all for the watched directory.
* When @p watchFiles is true, all files in the watched directory
* are watched for changes, too. Thus, the signals dirty(),
* created(), deleted() can be emitted.
*
* @param path the path to watch
* @param watchFiles if true, the KSimpleDirWatch will also watch files - NOT IMPLEMENTED YET
* @param recursive if true, all sub directories are also watched - NOT IMPLEMENTED YET
*/
void addDir(const TQString& path,
bool watchFiles = false, bool recursive = false);
/**
* Adds a file to be watched.
* @param file the file to watch
*/
void addFile(const TQString& file);
/**
* Returns the time the directory/file was last changed.
* @param path the file to check
* @return the date of the last modification
*/
TQDateTime ctime(const TQString& path);
/**
* Removes a directory from the list of scanned directories.
*
* If specified path is not in the list this does nothing.
* @param path the path of the dir to be removed from the list
*/
void removeDir(const TQString& path);
/**
* Removes a file from the list of watched files.
*
* If specified path is not in the list this does nothing.
* @param file the file to be removed from the list
*/
void removeFile(const TQString& file);
/**
* Stops scanning the specified path.
*
* The @p path is not deleted from the interal just, it is just skipped.
* Call this function when you perform an huge operation
* on this directory (copy/move big files or many files). When finished,
* call restartDirScan(path).
*
* @param path the path to skip
* @return true if the @p path is being watched, otherwise false
* @see restartDirScanning()
*/
bool stopDirScan(const TQString& path);
/**
* Restarts scanning for specified path.
*
* Resets ctime. It doesn't notify
* the change (by emitted a signal), since the ctime value is reset.
*
* Call it when you are finished with big operations on that path,
* @em and when @em you have refreshed that path.
*
* @param path the path to restart scanning
* @return true if the @p path is being watched, otherwise false
* @see stopDirScanning()
*/
bool restartDirScan(const TQString& path);
/**
* Starts scanning of all dirs in list.
*
* @param notify If true, all changed directories (since
* stopScan() call) will be notified for refresh. If notify is
* false, all ctimes will be reset (except those who are stopped,
* but only if @p skippedToo is false) and changed dirs won't be
* notified. You can start scanning even if the list is
* empty. First call should be called with @p false or else all
* directories
* in list will be notified.
* @param skippedToo if true, the skipped directoris (scanning of which was
* stopped with stopDirScan() ) will be reset and notified
* for change. Otherwise, stopped directories will continue to be
* unnotified.
*/
void startScan( bool notify=false, bool skippedToo=false );
/**
* Stops scanning of all directories in internal list.
*
* The timer is stopped, but the list is not cleared.
*/
void stopScan();
/**
* Is scanning stopped?
* After creation of a KSimpleDirWatch instance, this is false.
* @return true when scanning stopped
*/
bool isStopped() { return _isStopped; }
/**
* Check if a directory is being watched by this KSimpleDirWatch instance
* @param path the directory to check
* @return true if the directory is being watched
*/
bool contains( const TQString& path ) const;
/**
* Dump statistic information about all KSimpleDirWatch instances.
* This checks for consistency, too.
*/
static void statistics();
/**
* Emits created().
* @param path the path of the file or directory
*/
void setCreated( const TQString &path );
/**
* Emits dirty().
* @param path the path of the file or directory
*/
void setDirty( const TQString &path );
/**
* Emits deleted().
* @param path the path of the file or directory
*/
void setDeleted( const TQString &path );
enum Method { FAM, DNotify, Stat, INotify };
/**
* Returns the preferred internal method to
* watch for changes.
* @since 3.2
*/
Method internalMethod();
/**
* The KSimpleDirWatch instance usually globally used in an application.
* It is automatically deleted when the application exits.
*
* However, you can create an arbitrary number of KSimpleDirWatch instances
* aside from this one - for those you have to take care of memory management.
*
* This function returns an instance of KSimpleDirWatch. If there is none, it
* will be created.
*
* @return a KSimpleDirWatch instance
*/
static KSimpleDirWatch* self();
/**
* Returns true if there is an instance of KSimpleDirWatch.
* @return true if there is an instance of KSimpleDirWatch.
* @see KSimpleDirWatch::self()
* @since 3.1
*/
static bool exists();
signals:
/**
* Emitted when a watched object is changed.
* For a directory this signal is emitted when files
* therein are created or deleted.
* For a file this signal is emitted when its size or attributes change.
*
* When you watch a directory, changes in the size or attributes of
* contained files may or may not trigger this signal to be emitted
* depending on which backend is used by KSimpleDirWatch.
*
* The new ctime is set before the signal is emitted.
* @param path the path of the file or directory
*/
void dirty (const TQString &path);
/**
* Emitted when a file or directory is created.
* @param path the path of the file or directory
*/
void created (const TQString &path );
/**
* Emitted when a file or directory is deleted.
*
* The object is still watched for new creation.
* @param path the path of the file or directory
*/
void deleted (const TQString &path );
private:
bool _isStopped;
KSimpleDirWatchPrivate *d;
static KSimpleDirWatch* s_pSelf;
};
#endif
// vim: sw=3 et