Package com.storedobject.core

Class FileDataProvider

java.lang.Object

com.storedobject.core.FileDataProvider

All Implemented Interfaces:

StreamDataProvider

public class FileDataProvider
extends Object
implements StreamDataProvider

Constructor Summary

Constructors

Constructor	Description
FileDataProvider(File file)
FileDataProvider(String fileName)

Method Summary

Modifier and Type	Method	Description
InputStream	getStream(StreamData streamData)	Get an input stream for reading the data.
void	writeStream(StreamData streamData, OutputStream output)	This method will be called only if getStream() returns "null".

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

FileDataProvider

public FileDataProvider(String fileName)

FileDataProvider

public FileDataProvider(File file)

Method Details

getStream

public InputStream getStream(StreamData streamData)
                      throws Exception

Description copied from interface: StreamDataProvider

Get an input stream for reading the data. If a stream for reading data can not be provided, return "null" so that writeStream() will be called.

Specified by:

getStream in interface StreamDataProvider

Parameters:

streamData - Stream data that is requesting the stream.

Returns:

Input stream from which data can be obtained. The stream will be closed after reading the data from it.

Throws:

Exception - Any exception other than Data_Not_Changed will cause the transaction "rollback".

writeStream

public void writeStream(StreamData streamData,
 OutputStream output)
                 throws Exception

Description copied from interface: StreamDataProvider

This method will be called only if getStream() returns "null".

Specified by:

writeStream in interface StreamDataProvider

Parameters:

streamData - Stream data that is requesting the stream.

output - Output stream to which data can be written. There is no need to close the stream after writing.

Throws:

Exception - Any exception thrown will cause the transaction "rollback".