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169 lines
6.4 KiB
169 lines
6.4 KiB
/*
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* This file is part of KMail, the KDE mail client
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* Copyright (c) Ronen Tzur <rtzur@shani.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef __KMMSGDICT
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#define __KMMSGDICT
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#include <tqvaluelist.h>
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#include <tqptrlist.h>
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class KMFolder;
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class KMMsgBase;
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class KMMessage;
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class KMMsgDictEntry;
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class KMMsgDictREntry;
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class KMDict;
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class TQString;
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class FolderStorage;
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/**
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* @short KMail message dictionary. Keeps location information for every
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* message. The message serial number is the key for the dictionary.
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*
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* The KMMsgDict singleton is used to look up at which index in which folder a
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* certain serial number can be found. Each folder holds a "reverse entry",
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* which is an array of message dict entries for that folder and persists that
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* to disk as an array of serial numbers, the "$folder.index.ids" file.
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* In effect the whole message dict is therefor persisted per folder
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* and restored on startup when all folder dict entries are read and re-enter
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* their respective entries (serial numbers) into the global dict. The code for
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* creating, deleting and manipulating these files is in this class, rather than
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* the FolderStorage class, which only holds the pointer to the reverse entry
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* and otherwise knows nothing of the message dict.
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*
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* @author Ronen Tzur <rtzur@shani.net>
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*/
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class KMMsgDict
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{
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template<class> friend class KStaticDeleter;
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public:
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/** Access the globally unique MessageDict */
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static const KMMsgDict* instance();
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/** Returns the folder the message represented by the serial number @p key is in
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* and the index in that folder at which it is stored. */
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void getLocation( unsigned long key, KMFolder **retFolder, int *retIndex ) const;
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/** Returns the folder the message represented by @p msg is in
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* and the index in that folder at which it is stored. */
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void getLocation( const KMMsgBase *msg, KMFolder **retFolder, int *retIndex ) const;
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/** Returns the folder the message represented by @p msg is in
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* and the index in that folder at which it is stored. */
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void getLocation( const KMMessage *msg, KMFolder **retFolder, int *retIndex ) const;
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/** Find the message serial number for the message located at index @p index in folder
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* @p folder.
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* @return the message serial number or zero is no such message can be found */
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unsigned long getMsgSerNum( KMFolder *folder, int index ) const;
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/** Convert a list of KMMsgBase pointers to a list of serial numbers */
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static TQValueList<unsigned long> serNumList(TQPtrList<KMMsgBase> msgList);
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private:
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/* FIXME It would be better to do without these, they are the classes
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* involved in filling and maintaining the dict. The MsgList needs access
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* because of things it does that should be in FolderIndex, probably, which
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* the message list is an implementation detail of. */
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friend class FolderStorage;
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friend class KMMsgList;
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friend class KMFolderIndex;
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// Access for those altering the dict, our friend classes
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static KMMsgDict* mutableInstance();
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/** Insert a new message. The message serial number is specified in
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* @p msgSerNum and may be zero, in which case a new serial number is
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* generated. Returns the message serial number. */
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unsigned long insert(unsigned long msgSerNum, const KMMsgBase *msg, int index = -1);
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/** Insert a new message. The message serial number is taken from
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* the message, and passed to the other insert(). Returns the message
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* serial number. */
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unsigned long insert(const KMMsgBase *msg, int index = -1);
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/** Set the serial number of @p msg to @p msgSerNum */
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void replace(unsigned long msgSerNum,
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const KMMsgBase *msg, int index = -1);
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/** Removes a message. */
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void remove(unsigned long msgSerNum);
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/** Removes a message, and returns its message serial number. */
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unsigned long remove(const KMMsgBase *msg);
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/** Updates index for a message. */
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void update(const KMMsgBase *msg, int index, int newIndex);
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// ----- per folder serial number on-disk structure handling ("ids files")
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/** Returns the name of the .folder.index.ids file. */
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static TQString getFolderIdsLocation( const FolderStorage &folder );
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/** Returns TRUE if the .folder.index.ids file should not be read. */
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bool isFolderIdsOutdated( const FolderStorage &folder );
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/** Reads the .folder.index.ids file. Returns 0 on success. */
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int readFolderIds( FolderStorage & );
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/** Writes the .folder.index.ids file. Returns 0 on success. */
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int writeFolderIds( const FolderStorage & );
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/** Touches the .folder.index.ids file. Returns 0 on success. */
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int touchFolderIds( const FolderStorage & );
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/** Appends the message to the .folder.index.ids file.
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* Returns 0 on success. */
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int appendToFolderIds( FolderStorage&, int index );
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/** Returns true if the folder has a .folder.index.ids file. */
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bool hasFolderIds( const FolderStorage & );
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/** Removes the .folder.index.ids file. */
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bool removeFolderIds( FolderStorage & );
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/** Opens the .folder.index.ids file, and writes the header
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* information at the beginning of the file. */
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KMMsgDictREntry *openFolderIds( const FolderStorage &, bool truncate);
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// --------- helpers ------------
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/** delete an entry that has been assigned to a folder. Needs to be done from
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* inside this file, since operator delete is not available outside. */
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static void deleteRentry(KMMsgDictREntry *entry);
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/** Returns the next message serial number for use. */
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unsigned long getNextMsgSerNum();
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// prevent creation and deletion, we are a singleton
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KMMsgDict();
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~KMMsgDict();
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/** Highest message serial number we know of. */
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unsigned long nextMsgSerNum;
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/** The dictionary. */
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KMDict *dict;
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/** The singleton instance */
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static KMMsgDict *m_self;
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};
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#endif /* __KMMSGDICT */
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