Package nbbrd.io

Class BlockSizer

java.lang.Object

nbbrd.io.BlockSizer

public class BlockSizer
extends Object

System-wide utility that gets the number of bytes per block from several byte sources. May be overridden to deal with new JDK APIs.

Field Summary

Fields

Modifier and Type	Field	Description
static final long	DEFAULT_BLOCK_BUFFER_SIZE
static final long	DEFAULT_BUFFER_OUTPUT_STREAM_SIZE
static final AtomicReference<BlockSizer>	INSTANCE
static final long	UNKNOWN_SIZE

Constructor Summary

Constructors

Constructor	Description
BlockSizer()

Method Summary

Modifier and Type	Method	Description
long	getBlockSize(InputStream stream)	Returns the number of bytes per block in the input stream implementation.
long	getBlockSize(OutputStream stream)	Returns the number of bytes per block in the output stream implementation.
long	getBlockSize(Path file)	Returns the number of bytes per block in the file store of this file.

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final AtomicReference<BlockSizer> INSTANCE

DEFAULT_BLOCK_BUFFER_SIZE

public static final long DEFAULT_BLOCK_BUFFER_SIZE

See Also:

• Constant Field Values

DEFAULT_BUFFER_OUTPUT_STREAM_SIZE

public static final long DEFAULT_BUFFER_OUTPUT_STREAM_SIZE

See Also:

• Constant Field Values

UNKNOWN_SIZE

public static final long UNKNOWN_SIZE

See Also:

• Constant Field Values

Constructor Details

BlockSizer

public BlockSizer()

Method Details

getBlockSize

public long getBlockSize(Path file)
                  throws IOException

Returns the number of bytes per block in the file store of this file.

Parameters:

file - a non-null file as byte source

Returns:

a positive value representing the block size in bytes if available, -1 otherwise

Throws:

IOException - if an I/O error occurs

See Also:

• https://docs.oracle.com/javase/10/docs/api/java/nio/file/FileStore.html#getBlockSize()

getBlockSize

public long getBlockSize(InputStream stream)
                  throws IOException

Returns the number of bytes per block in the input stream implementation.

Parameters:

stream - a non-null input stream as byte source

Returns:

a positive value representing the block size in bytes if available, -1 otherwise

Throws:

IOException - if an I/O error occurs

getBlockSize

public long getBlockSize(OutputStream stream)
                  throws IOException

Returns the number of bytes per block in the output stream implementation.

Parameters:

stream - a non-null output stream as byte source

Returns:

a positive value representing the block size in bytes if available, -1 otherwise

Throws:

IOException - if an I/O error occurs