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diff --git a/libemailfunctions/idmapper.h b/libemailfunctions/idmapper.h
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+++ b/libemailfunctions/idmapper.h
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+/*
+    This file is part of kdepim.
+
+    Copyright (c) 2004 Tobias Koenig <tokoe@kde.org>
+    Copyright (c) 2004 Cornelius Schumacher <schumacher@kde.org>
+
+    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.
+*/
+#ifndef KPIM_IDMAPPER_H
+#define KPIM_IDMAPPER_H
+
+#include <qmap.h>
+#include <qvariant.h>
+
+#include <kdepimmacros.h>
+
+namespace KPIM {
+
+/**
+    An Id Mapper maps Ids. What to or what for is not entirely
+    clear, but maps have categories. This is probably an
+    adjoint functor, since adjoint functors are everywhere.
+*/
+class KDE_EXPORT IdMapper
+{
+  public:
+    /**
+      Create Id mapper. You have to set path and identifier before you can call
+      load() or save().
+    */
+    IdMapper();
+    /**
+      Create Id mapper. The path specifies the category of mapping, the
+      identifier the concrete object.
+      
+      If you don't pass an identifier you have to set it before calling load()
+      or save().
+      
+      The current implementation stores the data at
+      $(KDEHOME)/share/apps/\<path\>/\<identifier\>.
+    */
+    IdMapper( const QString &path, const QString &identifier = QString::null );
+    /** Destructor. */
+    ~IdMapper();
+
+    /**
+      Set id map path.
+    */
+    void setPath( const QString &path );
+    /**
+      Return id map path.
+    */
+    QString path() const { return mPath; }
+
+    /**
+      Set id map identifier.
+    */
+    void setIdentifier( const QString &identifier );
+    /**
+      Return id map identifier.
+    */
+    QString identifier() const { return mIdentifier; }
+
+    /**
+      Loads the map.
+     */
+    bool load();
+
+    /**
+      Saves the map.
+     */
+    bool save();
+
+    /**
+      Clears the map.
+     */
+    void clear();
+
+    /**
+      Stores the remote id for the given local id.
+     */
+    void setRemoteId( const QString &localId, const QString &remoteId );
+
+    /**
+      Removes the remote id.
+     */
+    void removeRemoteId( const QString &remoteId );
+
+    /**
+      Returns the remote id of the given local id.
+     */
+    QString remoteId( const QString &localId ) const;
+
+    /**
+      Returns the local id for the given remote id.
+     */
+    QString localId( const QString &remoteId ) const;
+
+
+    /**
+     * Stores a fingerprint for an id which can be used to detect if 
+     * the locally held version differs from what is on the server.
+     * This can be a sequence number of an md5 hash depending on what
+     * the server provides
+     */
+    void setFingerprint( const QString &localId, const QString &fingerprint );
+
+    /**
+     * Returns the fingerprint for the map.
+     *
+     * @todo Figure out if this applies to the last set fingerprint
+     *       or if anything else can change it.
+     */
+    const QString &fingerprint( const QString &localId ) const;
+
+
+    /**
+     * Returns the entire map for the Id mapper.
+     *
+     * @todo Document what the map means.
+     */
+    QMap<QString, QString> remoteIdMap() const;
+
+    /**
+     * Returns a string representation of the id pairs, that's usefull
+     * for debugging.
+     */
+    QString asString() const;
+
+  protected:
+    /**
+     * Returns the filename this mapper is (or will be) stored in.
+     */
+    QString filename();
+
+  private:
+    QMap<QString, QVariant> mIdMap;
+    QMap<QString, QString> mFingerprintMap;
+
+    QString mPath;
+    QString mIdentifier;
+};
+
+}
+
+#endif