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diff --git a/ark/arkapp.h b/ark/arkapp.h
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+/*
+
+ ark -- archiver for the KDE project
+
+ Copyright (C)
+
+ 2002: Helio Chissini de Castro <[email protected]>
+ 1999-2000: Corel Corporation (author: Emily Ezust  [email protected])
+ 1999: Francois-Xavier Duranceau [email protected]
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ as published by the Free Software Foundation; either version 2
+ of the License, or (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+*/
+
+#ifndef ARKAPP_H
+#define ARKAPP_H
+
+#include "mainwindow.h"
+
+// QT includes
+#include <qdict.h>
+
+// KDE includes
+#include <kuniqueapplication.h>
+
+class QString;
+class QStringList;
+
+class EqualKey
+{
+	public:
+		bool operator()(const QString & str1, const QString & str2) const
+		{
+			return (str1 == str2);
+		}
+};
+
+
+// This class follows the singleton pattern.
+class ArkApplication : public KUniqueApplication
+{
+	Q_OBJECT
+	public:
+		virtual int newInstance();
+		virtual ~ArkApplication() {}
+
+		// keep track of windows so we know when to quit
+		int windowCount() { return m_windowCount; }
+		int addWindow() { ++m_windowCount; return m_windowCount; }
+		void removeWindow() { --m_windowCount;}
+
+		// keep track of open archive names so we don't open one twice
+		// note that ArkWidget is not a pointer to const because raise()
+		// requires later a pointer to nonconst.
+		void addOpenArk(const KURL & _arkname, MainWindow * _ptr);
+		void removeOpenArk(const KURL & _arkname);
+
+		bool isArkOpenAlready(const KURL & _arkname);
+
+		void raiseArk(const KURL & _arkname);
+
+		// use this function to access data from other modules.
+		static ArkApplication *getInstance();
+
+	protected:
+		ArkApplication();
+
+	private:
+		QWidget *m_mainwidget;  // to be the parent of all ArkWidgets
+		int m_windowCount;
+
+		QStringList openArksList;
+
+		// a hash to obtain the window associated with a filename.
+		// given a QString key, you get an ArkWidget * pointer.
+		QDict<MainWindow> m_windowsHash;
+
+		static ArkApplication *mInstance;
+};
+
+#endif // ARKAPP_H