--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/javacommons/fileutils/src/nativefileiohandler.h	Mon May 03 12:27:20 2010 +0300
@@ -0,0 +1,131 @@
+/*
+* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  Handler for File IO Operations
+ *
+*/
+
+
+#ifndef NATIVEFILEIOHANDLER_H
+#define NATIVEFILEIOHANDLER_H
+
+#include <string>
+
+namespace java
+{
+namespace fileutils
+{
+
+/**
+ * Implements methods to read/write data from the native file system.
+ */
+OS_NONSHARABLE_CLASS(NativeFileIOHandler)
+{
+public:
+    NativeFileIOHandler(const std::wstring aName);
+    virtual ~NativeFileIOHandler();
+
+    /**
+     * Reads data from the file into aBuffer upto aLength bytes.
+     * Returns the amount of data read.
+     * In case of errors, exception is thrown with errno value.
+     */
+    virtual int readBytes(char* aBuffer, int aLength);
+
+    /**
+     * Writes data from aBuffer into the file upto aLength bytes.
+     * Returns the amount of data written.
+     * In case of errors, exception is thrown with errno value.
+     */
+    virtual int writeBytes(char* aBuffer, int aLength);
+
+    /**
+     * Stops read operation. In case the file is opened in read-write mode and
+     * if the write operations are in progress, the file is kept open to allow
+     * for write operations. Else the file is closed.
+     */
+    virtual void stopReading();
+
+    /**
+     * Stops write operation. In case the file is opened in read-write mode and
+     * if the read operations are in progress, the file is kept open to allow
+     * for read operations. Else the file is closed.
+     */
+    virtual void stopWriting();
+
+    /**
+     * Opens the file specified during the construction of the object for read
+     * operations.
+     * @throws errno value in case open failed.
+     */
+    virtual void openForReading();
+
+    /**
+     * Opens the file specified during the construction of the object for write
+     * operations.
+     * @throws errno value in case open failed.
+     */
+    virtual void openForWriting(const long aOffset);
+
+    /**
+     * Skips aOffset number of bytes.
+     * Positive value of aOffset moves the position forward and negatve backwards.
+     * Return value is the actual value that can be skipped.
+     */
+    virtual long skip(const long aOffset);
+
+    /**
+     * Closes the file descriptors but will not delete all data.
+     * On next call to read or write, we continue from previous offset.
+     */
+    virtual void closeFileToReopen();
+
+    /**
+     * Returns the amount of data available in the file from current read offset.
+     */
+    virtual long available();
+
+protected:
+    virtual void handleReopenCase();
+
+private:
+    void closeStream();
+
+    NativeFileIOHandler();
+
+protected:
+    // Name of the file to which the stream is opened
+    std::wstring mFileName;
+
+    // Will be set in case the descriptors were closed temporarily. On next call
+    // to read or write, we re-open the file and continue with previous offset.
+    bool mClosedTemporarily;
+private:
+    // Stream to do read and write
+    int mFileDescriptor;
+
+    // Holds the mode in which the file has to be opened
+    int mFileAccessMode;
+
+    // Holds the current read position
+    long mReadPosition;
+
+    // Holds the current write position
+    long mWritePosition;
+
+};
+
+} // end namespace fileutils
+} // end namespace java
+
+#endif // NATIVEFILEIOHANDLER_H