Package org.openremote.container.web.file

Class ResettableBufferedOutputStream

java.lang.Object

java.io.OutputStream

org.openremote.container.web.file.ResettableBufferedOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable, ResettableBuffer

public class ResettableBufferedOutputStream
extends OutputStream
implements ResettableBuffer

This resettable buffered output stream will buffer everything until the given threshold buffer size, regardless of flush calls. Only when the specified threshold buffer size is exceeded, or when close() is called, then the buffer will be actually flushed.

There is a reset() method which enables the developer to reset the buffer, as long as it's not flushed yet, which can be determined by isResettable().

See Also:

• ResettableBufferedWriter

Constructor Summary

Constructors

Constructor	Description
ResettableBufferedOutputStream(int thresholdBufferSize)	Construct a new resettable buffered output stream which forcibly buffers everything until the given threshold buffer size, regardless of flush calls and calls.
ResettableBufferedOutputStream(OutputStream output, int thresholdBufferSize)	Construct a new resettable buffered output stream which wraps the given output stream and forcibly buffers everything until the given threshold buffer size, regardless of flush calls.

Method Summary

Modifier and Type	Method	Description
void	close()
protected OutputStream	createOutputStream(boolean thresholdBufferSizeExceeded)	Returns the custom implementation of the OutputStream.
void	flush()
protected int	getWrittenBytes()	Returns the amount of so far written bytes in the threshold buffer.
boolean	isResettable()	Returns true if buffer can be reset.
void	reset()	Perform a buffer reset.
void	write(byte[] bytes)
void	write(byte[] bytes, int offset, int length)
void	write(int b)

Methods inherited from class java.io.OutputStream

nullOutputStream

Methods inherited from class java.lang.Object

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

Constructor Details

ResettableBufferedOutputStream

public ResettableBufferedOutputStream(int thresholdBufferSize)

Construct a new resettable buffered output stream which forcibly buffers everything until the given threshold buffer size, regardless of flush calls and calls. You need to override createOutputStream(boolean) when using this constructor.

Parameters:

thresholdBufferSize - The threshold buffer size.

ResettableBufferedOutputStream

public ResettableBufferedOutputStream(OutputStream output,
 int thresholdBufferSize)

Construct a new resettable buffered output stream which wraps the given output stream and forcibly buffers everything until the given threshold buffer size, regardless of flush calls. You do not need to override createOutputStream(boolean) when using this constructor.

Parameters:

output - The wrapped output stream .

thresholdBufferSize - The threshold buffer size.

Method Details

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

write

public void write(byte[] bytes)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

write

public void write(byte[] bytes,
 int offset,
 int length)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

createOutputStream

protected OutputStream createOutputStream(boolean thresholdBufferSizeExceeded)
                                   throws IOException

Returns the custom implementation of the OutputStream. This will only be called when the specified threshold buffer size is exceeded, or when close() is called.

Parameters:

thresholdBufferSizeExceeded - Whether the threshold buffer size has exceeded.

Returns:

The custom implementation of the OutputStream.

Throws:

IOException - When an I/O error occurs.

getWrittenBytes

protected int getWrittenBytes()

Returns the amount of so far written bytes in the threshold buffer. This will be 0 when the threshold buffer is empty and this will be -1 when the threshold has exceeded.

Returns:

The amount of so far written bytes in the threshold buffer.

reset

public void reset()

Description copied from interface: ResettableBuffer

Perform a buffer reset.

Specified by:

reset in interface ResettableBuffer

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class OutputStream

Throws:

IOException

isResettable

public boolean isResettable()

Description copied from interface: ResettableBuffer

Returns true if buffer can be reset.

Specified by:

isResettable in interface ResettableBuffer

Returns:

true if buffer can be reset, otherwise false.