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diff --git a/kompare/interfaces/kompareinterface.h b/kompare/interfaces/kompareinterface.h
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+++ b/kompare/interfaces/kompareinterface.h
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+// blah blah standard LGPL license
+// Copyright 2002-2003, Otto Bruggeman <otto.bruggeman@home.nl>
+
+#ifndef _KOMPARE_INTERFACE_H
+#define _KOMPARE_INTERFACE_H
+
+#include <qstring.h>
+#include <qstringlist.h>
+#include <kdemacros.h>
+
+class KConfig;
+class KURL;
+
+class KompareInterfacePrivate;
+
+class KDE_EXPORT KompareInterface
+{
+public:
+	KompareInterface();
+	virtual ~KompareInterface();
+
+protected:
+	KompareInterface( const KompareInterface& );
+	KompareInterface& operator=(const KompareInterface& );
+
+public:
+	/**
+	 * Open and parse the diff file at url.
+	 */
+	virtual bool openDiff( const KURL& diffUrl ) = 0;
+
+	/**
+	 * Open and parse the supplied diff output
+	 */
+	virtual bool openDiff( const QString& diffOutput ) = 0;
+
+	/**
+	 * Open and parse the diff3 file at url.
+	 */
+	virtual bool openDiff3( const KURL& diff3Url ) = 0;
+
+	/**
+	 * Open and parse the supplied diff3 output
+	 */
+	virtual bool openDiff3( const QString& diff3Output ) = 0;
+
+	/**
+	 * Compare, with diff, source with destination, can also be used if you dont
+	 * know what source and destination are. The part will try to figure out what
+	 * they are (directory, file, diff output file) and call the
+	 * appropriate method(s)
+	 */
+	virtual void compare( const KURL& sourceFile, const KURL& destinationFile ) = 0;
+
+	/**
+	 * Compare, with diff, source with destination files
+	 */
+	virtual void compareFiles( const KURL& sourceFile, const KURL& destinationFile ) = 0;
+
+	/**
+	 * Compare, with diff, source with destination directories
+	 */
+	virtual void compareDirs ( const KURL& sourceDir, const KURL& destinationDir ) = 0;
+
+	/**
+	 * Compare, with diff3, originalFile with changedFile1 and changedFile2
+	 */
+	virtual void compare3Files( const KURL& originalFile, const KURL& changedFile1, const KURL& changedFile2 ) = 0;
+
+	/**
+	 * This will show the file and the file with the diff applied
+	 */
+	virtual void openFileAndDiff( const KURL& file, const KURL& diffFile ) = 0;
+
+	/**
+	 * This will show the directory and the directory with the diff applied
+	 */
+	virtual void openDirAndDiff ( const KURL& dir,  const KURL& diffFile ) = 0;
+
+	/**
+	 * This will set the encoding to use for all files that are read or for the diffoutput
+	 */
+	virtual void setEncoding( const QString& encoding );
+
+public:
+	/**
+	 * Warning this should be in class Part in KDE 4.0, not here !
+	 * Around that time the methods will disappear here
+	 */
+	virtual int readProperties( KConfig* config ) = 0;
+	virtual int saveProperties( KConfig* config ) = 0;
+
+	/**
+	 * Warning this should be in class ReadWritePart in KDE 4.0, not here !
+	 * Around that time the method will disappear here
+	 */
+	virtual bool queryClose() = 0;
+
+protected:
+	// Add all variables to the KompareInterfacePrivate class and access them through the kip pointer
+	KompareInterfacePrivate* kip;
+	QString                  m_encoding;
+};
+
+#endif /* _KOMPARE_INTERFACE_H */