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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
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+/*
+ Virtual base class for mail storage.
+
+ This file is part of KMail.
+
+ Copyright (c) 2004 Bo Thorsen <bo@sonofthor.dk>
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ 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.
+
+ In addition, as a special exception, the copyright holders give
+ permission to link the code of this program with any edition of
+ the Qt library by Trolltech AS, Norway (or with modified versions
+ of Qt that use the same license as Qt), and distribute linked
+ combinations including the two. You must obey the GNU General
+ Public License in all respects for all of the code used other than
+ Qt. If you modify this file, you may extend this exception to
+ your version of the file, but you are not obligated to do so. If
+ you do not wish to do so, delete this exception statement from
+ your version.
+*/
+
+#ifndef FOLDERSTORAGE_H
+#define FOLDERSTORAGE_H
+
+// for large file support
+#include <config.h>
+
+#include "kmfoldernode.h"
+#include "kmfoldertype.h"
+#include "kmmsginfo.h"
+#include "kmglobal.h"
+#include "folderjob.h"
+using KMail::FolderJob;
+
+#include "mimelib/string.h"
+
+#include <sys/types.h>
+#include <stdio.h>
+
+class KMMessage;
+class KMAccount;
+class KMFolderDir;
+class KMMsgDict; // for the rDict manipulations
+class KMMsgDictREntry;
+class QTimer;
+class KMSearchPattern;
+
+namespace KMail {
+ class AttachmentStrategy;
+}
+using KMail::AttachmentStrategy;
+
+typedef QValueList<Q_UINT32> SerNumList;
+
+/**
+ * @short The FolderStorage class is the bass class for the storage related
+ * aspects of a collection of mail (a folder).
+ *
+ * @section Accounts
+ * The accounts (of KMail) that are fed into the folder are
+ * represented as the children of the folder. They are only stored here
+ * during runtime to have a reference for which accounts point to a
+ * specific folder.
+ */
+
+class FolderStorage : public QObject
+{
+ Q_OBJECT
+
+public:
+
+
+ /** Usually a parent is given. But in some cases there is no
+ fitting parent object available. Then the name of the folder
+ is used as the absolute path to the folder file. */
+ FolderStorage( KMFolder* folder, const char* name=0 );
+ virtual ~FolderStorage();
+
+ KMFolder* folder() const { return mFolder; }
+
+ /** Returns the type of this folder */
+ virtual KMFolderType folderType() const { return KMFolderTypeUnknown; }
+
+ /** Returns the filename of the folder (reimplemented in KMFolderImap) */
+ virtual QString fileName() const;
+ /** Returns full path to folder file */
+ QString location() const;
+
+ /** Returns full path to index file */
+ virtual QString indexLocation() const = 0;
+
+ /** Returns, if the folder can't contain mails, but only subfolder */
+ virtual bool noContent() const { return mNoContent; }
+
+ /** Specify, that the folder can't contain mails. */
+ virtual void setNoContent(bool aNoContent)
+ { mNoContent = aNoContent; }
+
+ /** Returns, if the folder can't have children */
+ virtual bool noChildren() const { return mNoChildren; }
+
+ /** Specify, that the folder can't have children */
+ virtual void setNoChildren( bool aNoChildren );
+
+ enum ChildrenState {
+ HasChildren,
+ HasNoChildren,
+ ChildrenUnknown
+ };
+ /** Returns if the folder has children,
+ * has no children or we don't know */
+ virtual ChildrenState hasChildren() const { return mHasChildren; }
+
+ /** Specify if the folder has children */
+ virtual void setHasChildren( ChildrenState state )
+ { mHasChildren = state; }
+
+ /** Updates the hasChildren() state */
+ virtual void updateChildrenState();
+
+ /** Read message at given index. Indexing starts at zero */
+ virtual KMMessage* getMsg(int idx);
+
+ /** Replace KMMessage with KMMsgInfo and delete KMMessage */
+ virtual KMMsgInfo* unGetMsg(int idx);
+
+ /** Checks if the message is already "gotten" with getMsg */
+ virtual bool isMessage(int idx);
+
+ /** Load message from file and do NOT store it, only return it.
+ This is equivalent to, but faster than, getMsg+unGetMsg
+ WARNING: the caller has to delete the returned value!
+ */
+ virtual KMMessage* readTemporaryMsg(int idx);
+
+ /** Read a message and returns a DwString */
+ virtual DwString getDwString(int idx) = 0;
+
+ /**
+ * Removes and deletes all jobs associated with the particular message
+ */
+ virtual void ignoreJobsForMessage( KMMessage* );
+
+ /**
+ * These methods create respective FolderJob (You should derive FolderJob
+ * for each derived KMFolder).
+ */
+ virtual FolderJob* createJob( KMMessage *msg, FolderJob::JobType jt = FolderJob::tGetMessage,
+ KMFolder *folder = 0, QString partSpecifier = QString::null,
+ const AttachmentStrategy *as = 0 ) const;
+ virtual FolderJob* createJob( QPtrList<KMMessage>& msgList, const QString& sets,
+ FolderJob::JobType jt = FolderJob::tGetMessage,
+ KMFolder *folder = 0 ) const;
+
+ /** Provides access to the basic message fields that are also stored
+ in the index. Whenever you only need subject, from, date, status
+ you should use this method instead of getMsg() because getMsg()
+ will load the message if necessary and this method does not. */
+ virtual const KMMsgBase* getMsgBase(int idx) const = 0;
+ virtual KMMsgBase* getMsgBase(int idx) = 0;
+
+ /** Same as getMsgBase(int). */
+ virtual const KMMsgBase* operator[](int idx) const { return getMsgBase(idx); }
+
+ /** Same as getMsgBase(int). This time non-const. */
+ virtual KMMsgBase* operator[](int idx) { return getMsgBase(idx); }
+
+ /** Detach message from this folder. Usable to call addMsg() afterwards.
+ Loads the message if it is not loaded up to now. */
+ virtual KMMessage* take(int idx);
+ virtual void take(QPtrList<KMMessage> msgList);
+
+ /** Add the given message to the folder. Usually the message
+ is added at the end of the folder. Returns zero on success and
+ an errno error code on failure. The index of the new message
+ is stored in index_return if given.
+ Please note that the message is added as is to the folder and the folder
+ takes ownership of the message (deleting it in the destructor).*/
+ virtual int addMsg(KMMessage* msg, int* index_return = 0) = 0;
+
+ /** (Note(bo): This needs to be fixed better at a later point.)
+ This is overridden by dIMAP because addMsg strips the X-UID
+ header from the mail. */
+ virtual int addMsgKeepUID(KMMessage* msg, int* index_return = 0) {
+ return addMsg(msg, index_return);
+ }
+
+ /**
+ * Adds the given messages to the folder. Behaviour is identical
+ * to addMsg(msg)
+ */
+ virtual int addMsg( QPtrList<KMMessage>&, QValueList<int>& index_return );
+
+ /** Called by derived classes implementation of addMsg.
+ Emits msgAdded signals */
+ void emitMsgAddedSignals(int idx);
+
+ /** Returns FALSE, if the message has to be retrieved from an IMAP account
+ * first. In this case this function does this and cares for the rest */
+ virtual bool canAddMsgNow(KMMessage* aMsg, int* aIndex_ret);
+
+ /** Remove (first occurrence of) given message from the folder. */
+ virtual void removeMsg(int i, bool imapQuiet = false);
+ virtual void removeMsg(const QPtrList<KMMsgBase>& msgList, bool imapQuiet = false);
+ virtual void removeMsg(const QPtrList<KMMessage>& msgList, bool imapQuiet = false);
+
+ /** Delete messages in the folder that are older than days. Return the
+ * number of deleted messages. */
+ virtual int expungeOldMsg(int days);
+
+ /** Detaches the given message from it's current folder and
+ adds it to this folder. Returns zero on success and an errno error
+ code on failure. The index of the new message is stored in index_return
+ if given. */
+ virtual int moveMsg(KMMessage* msg, int* index_return = 0);
+ virtual int moveMsg(QPtrList<KMMessage>, int* index_return = 0);
+
+ /** Returns the index of the given message or -1 if not found. */
+ virtual int find(const KMMsgBase* msg) const = 0;
+ int find( const KMMessage * msg ) const;
+
+ /** Number of messages in this folder. */
+ virtual int count(bool cache = false) const;
+
+ /** Number of new or unread messages in this folder. */
+ virtual int countUnread();
+
+ /** Total size of the contents of this folder. */
+ Q_INT64 folderSize() const;
+
+ /** Return whether the folder is close to its quota limit, which can
+ * be reflected in the UI. */
+ virtual bool isCloseToQuota() const;
+
+ /** Called by KMMsgBase::setStatus when status of a message has changed
+ required to keep the number unread messages variable current. */
+ virtual void msgStatusChanged( const KMMsgStatus oldStatus,
+ const KMMsgStatus newStatus,
+ int idx);
+
+ /** Open folder for access.
+ open() and close() use reference counting.
+ Returns zero on success and an error code equal to the c-library
+ fopen call otherwise (errno).
+ @see KMFolderOpener */
+ virtual int open(const char* owner) = 0;
+
+ /** Check folder for permissions
+ Returns zero if readable and writable. */
+ virtual int canAccess() = 0;
+
+ /** Close folder. open() and close() use reference counting.
+ If @p force is true the files are closed regardless of reference count,
+ and the reference count will be set to zero. */
+ void close(const char* owner, bool force=false);
+ virtual void reallyDoClose(const char* owner) = 0;
+
+ /** Try releasing @p folder if possible, something is attempting an exclusive access to it.
+ Currently used for KMFolderSearch and the background tasks like expiry. */
+ virtual void tryReleasingFolder(KMFolder*) {}
+
+ /** fsync buffers to disk */
+ virtual void sync() = 0;
+
+ /** Test if folder is opened, i.e. its reference count is greater than zero. */
+ bool isOpened() const { return (mOpenCount>0); }
+
+ /** Mark all new messages as unread. */
+ virtual void markNewAsUnread();
+
+ /** Mark all new and unread messages as read. */
+ virtual void markUnreadAsRead();
+
+ /** Create a new folder with the name of this object and open it.
+ Returns zero on success and an error code equal to the
+ c-library fopen call otherwise. */
+ virtual int create() = 0;
+
+ /** Removes the folder physically from disk and empties the contents
+ of the folder in memory. Note that the folder is closed during this
+ process, whether there are others using it or not.
+ @see KMFolder::removeContents */
+ virtual void remove();
+
+ /** Delete entire folder. Forces a close *but* opens the
+ folder again afterwards. Returns errno(3) error code or zero on
+ success. see KMFolder::expungeContents */
+ virtual int expunge();
+
+ /** Remove deleted messages from the folder. Returns zero on success
+ and an errno on failure.
+ A statusbar message will inform the user that the compaction worked,
+ unless @p silent is set. */
+ virtual int compact( bool silent ) = 0;
+
+ /** Physically rename the folder. Returns zero on success and an errno
+ on failure. */
+ virtual int rename(const QString& newName, KMFolderDir *aParent = 0);
+
+ /** Returns TRUE if a table of contents file is automatically created. */
+ bool autoCreateIndex() const { return mAutoCreateIndex; }
+
+ /** Allow/disallow automatic creation of a table of contents file.
+ Default is TRUE. */
+ virtual void setAutoCreateIndex(bool);
+
+ /** Returns TRUE if the table of contents is dirty. This happens when
+ a message is deleted from the folder. The toc will then be re-created
+ when the folder is closed. */
+ bool dirty() const { return mDirty; }
+
+ /** Change the dirty flag. */
+ void setDirty(bool f);
+
+ /** Returns TRUE if the folder contains deleted messages */
+ bool needsCompacting() const { return needsCompact; }
+ virtual void setNeedsCompacting(bool f) { needsCompact = f; }
+
+ /** If set to quiet the folder will not emit msgAdded(idx) signal.
+ This is necessary because adding the messages to the listview
+ one by one as they come in ( as happens on msgAdded(idx) ) is
+ very slow for large ( >10000 ) folders. For pop, where whole
+ bodies are downloaded this is not an issue, but for imap, where
+ we only download headers it becomes a bottleneck. We therefore
+ set the folder quiet() and rebuild the listview completely once
+ the complete folder has been checked. */
+ virtual void quiet(bool beQuiet);
+
+ /** Is the folder read-only? */
+ virtual bool isReadOnly() const = 0;
+
+ /** Returns the label of the folder for visualization. */
+ QString label() const;
+
+ /** A cludge to help make sure the count of unread messges is kept in sync */
+ virtual void correctUnreadMsgsCount();
+
+ /** Write index to index-file. Returns 0 on success and errno error on
+ failure. */
+ virtual int writeIndex( bool createEmptyIndex = false ) = 0;
+
+ /** Triggers registration with the message dict, which will cause the dict
+ * to ask the FolderStorage to fill itself into it. */
+ void registerWithMessageDict();
+
+ /** Triggers deregistration from the message dict, which will cause the dict
+ * to ask the FolderStorage to write the relevant data structures to disk.. */
+ void deregisterFromMessageDict();
+
+ /** Set the status of the message at index @p idx to @p status. */
+ virtual void setStatus(int idx, KMMsgStatus status, bool toggle=false);
+
+ /** Set the status of the message(s) in the QValueList @p ids to @p status. */
+ virtual void setStatus(QValueList<int>& ids, KMMsgStatus status, bool toggle=false);
+
+ void removeJobs();
+
+ /** Escape a leading dot */
+ static QString dotEscape(const QString&);
+
+ /** Read the config file */
+ virtual void readConfig();
+
+ /** Write the config file */
+ virtual void writeConfig();
+
+ /**
+ * If this folder has a special trash folder set, return it. Otherwise
+ * return 0.
+ */
+ virtual KMFolder* trashFolder() const { return 0; }
+
+ /**
+ * Add job for this folder. This is done automatically by createJob.
+ * This method is public only for other kind of FolderJob like ExpireJob.
+ */
+ void addJob( FolderJob* ) const;
+
+ /** false if index file is out of sync with mbox file */
+ bool compactable() const { return mCompactable; }
+
+ /// Set the type of contents held in this folder (mail, calendar, etc.)
+ // If quiet is true, the KMailIcalIface is not informed of the changed. That's usefull
+ // for folder that are being copied around, should retain their type, but not cause
+ // conflicts on copy because events are identical in two folders.
+ virtual void setContentsType( KMail::FolderContentsType type, bool quiet = false );
+ /// @return the type of contents held in this folder (mail, calendar, etc.)
+ KMail::FolderContentsType contentsType() const { return mContentsType; }
+
+ /**
+ * Search for messages
+ * The end is signaled with searchDone()
+ */
+ virtual void search( const KMSearchPattern* );
+
+ /**
+ * Check if the message matches the search criteria
+ * The end is signaled with searchDone()
+ */
+ virtual void search( const KMSearchPattern*, Q_UINT32 serNum );
+
+ /** Returns true if this folder can be moved */
+ virtual bool isMoveable() const;
+
+ virtual KMAccount* account() const;
+
+signals:
+ /** Emitted when the status, name, or associated accounts of this
+ folder changed. */
+ void changed();
+
+ /** Emitted when the contents of a folder have been cleared
+ (new search in a search folder, for example) */
+ void cleared();
+
+ /** Emitted after an expunge. If not quiet, changed() will be
+ emmitted first. */
+ void expunged( KMFolder* );
+
+ /** Emitted when the folder was closed and ticket owners have to reopen */
+ void closed( KMFolder* );
+
+ /** Emitted when the serial numbers of this folder were invalidated. */
+ void invalidated( KMFolder * );
+
+ /** Emitted when the name of the folder changes. */
+ void nameChanged();
+
+ /** Emitted when the location on disk of the folder changes. This
+ * is used by all code which uses the locatio on disk of the folder storage
+ * ( or the cache storage ) as an identifier for the folder. */
+ void locationChanged( const QString &, const QString & );
+
+ /** Emitted when the contents type (calendar, mail, tasks, ..) of the
+ * folderstorage changes. */
+ void contentsTypeChanged( KMail::FolderContentsType type );
+
+ /** Emitted when the readonly status of the folder changes. */
+ void readOnlyChanged(KMFolder*);
+
+ /** Emitted before a message is removed from the folder. */
+ void msgRemoved(KMFolder*, Q_UINT32 sernum);
+
+ /** Emitted after a message is removed from the folder. */
+ void msgRemoved( int idx, QString msgIdMD5 );
+ void msgRemoved( KMFolder* );
+
+ /** Emitted when a message is added from the folder. */
+ void msgAdded(int idx);
+ void msgAdded(KMFolder*, Q_UINT32 sernum);
+
+ /** Emitted, when the status of a message is changed */
+ void msgChanged(KMFolder*, Q_UINT32 sernum, int delta);
+
+ /** Emitted when a field of the header of a specific message changed. */
+ void msgHeaderChanged(KMFolder*, int);
+
+ /** Emmited to display a message somewhere in a status line. */
+ void statusMsg(const QString&);
+
+ /** Emitted when number of unread messages has changed. */
+ void numUnreadMsgsChanged( KMFolder* );
+
+ /** Emitted when a folder was removed */
+ void removed(KMFolder*, bool);
+
+ /**
+ * Emitted when a search delivers results
+ * The matching serial numbers are included
+ * If @p complete is true the search is done
+ */
+ void searchResult( KMFolder*, QValueList<Q_UINT32>,
+ const KMSearchPattern*, bool complete );
+
+ /**
+ * Emitted when a search for a single message is completed
+ * The serial number and a bool matching yes/no is included
+ */
+ void searchDone( KMFolder*, Q_UINT32, const KMSearchPattern*, bool );
+
+ /** Emitted when the folder's size changes. */
+ void folderSizeChanged();
+
+
+public slots:
+ /** Incrementally update the index if possible else call writeIndex */
+ virtual int updateIndex() = 0;
+
+ /** Add the message to the folder after it has been retrieved from an IMAP
+ server */
+ virtual void reallyAddMsg(KMMessage* aMsg);
+
+ /** Add a copy of the message to the folder after it has been retrieved
+ from an IMAP server */
+ virtual void reallyAddCopyOfMsg(KMMessage* aMsg);
+
+ /** Emit changed signal if mQuite <=0 */
+ void slotEmitChangedTimer();
+
+protected slots:
+ virtual void removeJob( QObject* );
+
+ /** Process the next search batch */
+ void slotProcessNextSearchBatch();
+
+protected:
+
+ /**
+ * These two methods actually create the jobs. They have to be implemented
+ * in all folders.
+ * @see createJob
+ */
+ virtual FolderJob* doCreateJob( KMMessage *msg, FolderJob::JobType jt, KMFolder *folder,
+ QString partSpecifier, const AttachmentStrategy *as ) const = 0;
+ virtual FolderJob* doCreateJob( QPtrList<KMMessage>& msgList, const QString& sets,
+ FolderJob::JobType jt, KMFolder *folder ) const = 0;
+
+ /** Tell the folder that a header field that is usually used for
+ the index (subject, from, ...) has changed of given message.
+ This method is usually called from within KMMessage::setSubject/set... */
+ void headerOfMsgChanged(const KMMsgBase*, int idx);
+
+ /** Load message from file and store it at given index. Returns 0
+ on failure. */
+ virtual KMMessage* readMsg(int idx) = 0;
+
+ //--------- Message Dict manipulation
+friend class KMMsgDict;
+ /** Inserts messages into the message dictionary. The messages will get
+ * new serial numbers. This is only used on newly appeared folders, where
+ * there is no .ids file yet, or when that has been invalidated. */
+ virtual void fillMessageDict() {}
+
+ /** Read the on-disk cache of serial numbers of messages in this store
+ * and fill those into the global message dict, such that the messages
+ * we hold can be looked up there. */
+ void readFolderIdsFile();
+
+ /** Writes the message serial number file. */
+ int writeFolderIdsFile() const;
+
+ /** Touches the message serial number file. */
+ int touchFolderIdsFile();
+
+ /** Append message to end of message serial number file. */
+ int appendToFolderIdsFile( int idx = -1 );
+
+ /** Sets the reverse-dictionary for this folder. const, because the mRDict
+ * is mutable, since it is not part of the (conceptually) const-relevant state
+ * of the object. */
+ void setRDict(KMMsgDictREntry *rentry) const;
+
+ /** Returns the reverse-dictionary for this folder. */
+ KMMsgDictREntry *rDict() const { return mRDict; }
+
+
+ /** Replaces the serial number for the message @p msg at index @p idx with
+ * @p sernum */
+ void replaceMsgSerNum( unsigned long sernum, KMMsgBase* msg, int idx );
+
+ /** Called when serial numbers for a folder are invalidated,
+ invalidates/recreates data structures dependent on the
+ serial numbers for this folder */
+ void invalidateFolder();
+
+ /** Called by KMFolder::remove() to delete the actual contents.
+ At the time of the call the folder has already been closed, and
+ the various index files deleted. Returns 0 on success. */
+ virtual int removeContents() = 0;
+
+ /** Called by KMFolder::expunge() to delete the actual contents.
+ At the time of the call the folder has already been closed, and
+ the various index files deleted. Returns 0 on success. */
+ virtual int expungeContents() = 0;
+
+ /** Read index file and fill the message-info list mMsgList. */
+ virtual bool readIndex() = 0;
+ virtual KMMsgBase* takeIndexEntry( int idx ) = 0;
+ virtual KMMsgInfo* setIndexEntry( int idx, KMMessage *msg ) = 0;
+ virtual void clearIndex(bool autoDelete=true, bool syncDict = false) = 0;
+ virtual void truncateIndex() = 0;
+
+ virtual Q_INT64 doFolderSize() const { return 0; };
+
+ int mOpenCount;
+ int mQuiet;
+ bool mChanged :1;
+ /** is the automatic creation of a index file allowed ? */
+ bool mAutoCreateIndex :1;
+ /** Has this storage exported its serial numbers to the global message
+ * dict for lookup? */
+ bool mExportsSernums :1;
+ /** if the index is dirty it will be recreated upon close() */
+ bool mDirty :1;
+ /** TRUE if the files of the folder are locked (writable) */
+ bool mFilesLocked :1;
+
+ /** number of unread messages, -1 if not yet set */
+ int mUnreadMsgs, mGuessedUnreadMsgs;
+ int mTotalMsgs;
+ Q_INT64 mSize;
+ bool mWriteConfigEnabled :1;
+ /** sven: true if on destruct folder needs to be compacted. */
+ bool needsCompact :1;
+ /** false if index file is out of sync with mbox file */
+ bool mCompactable :1;
+ bool mNoContent :1;
+ bool mNoChildren :1;
+ bool mConvertToUtf8 :1;
+
+ /** Points at the reverse dictionary for this folder. */
+ mutable KMMsgDictREntry *mRDict;
+ /** List of jobs created by this folder. */
+ mutable QPtrList<FolderJob> mJobList;
+
+ QTimer *mDirtyTimer;
+ enum { mDirtyTimerInterval = 600000 }; // 10 minutes
+
+ ChildrenState mHasChildren;
+
+ /** Type of contents in this folder. */
+ KMail::FolderContentsType mContentsType;
+
+ KMFolder* mFolder;
+
+ QTimer * mEmitChangedTimer;
+
+ int mCurrentSearchedMsg;
+ const KMSearchPattern* mSearchPattern;
+};
+
+#endif // FOLDERSTORAGE_H