org.glassfish.grizzly.memory

Class Buffers

java.lang.Object

org.glassfish.grizzly.memory.Buffers

public class Buffers
extends Object

Class has useful methods to simplify the work with Buffers.

Author:

Alexey Stashok

See Also:

Buffer

Field Summary

Fields

Modifier and Type	Field and Description
static Buffer	EMPTY_BUFFER
static ByteBuffer	EMPTY_BYTE_BUFFER
static ByteBuffer[]	EMPTY_BYTE_BUFFER_ARRAY

Constructor Summary

Constructors

Constructor and Description
Buffers()

Method Summary

Methods

Modifier and Type	Method and Description
static Buffer	appendBuffers(MemoryManager memoryManager, Buffer buffer1, Buffer buffer2) Append two Buffers.
static Buffer	appendBuffers(MemoryManager memoryManager, Buffer buffer1, Buffer buffer2, boolean isCompositeBufferDisposable) Append two Buffers.
static Buffer	cloneBuffer(Buffer srcBuffer) Clones the source Buffer.
static Buffer	cloneBuffer(Buffer srcBuffer, int position, int limit) Clones the source Buffer.
static void	fill(Buffer buffer, byte b) Fill the Buffer with the specific byte value.
static void	fill(Buffer buffer, int position, int limit, byte b) Fill the Buffer's part [position, limit) with the specific byte value starting from the Buffer's position won't be changed.
static void	fill(ByteBuffer byteBuffer, byte b) Fill the ByteBuffer with the specific byte value.
static void	fill(ByteBuffer byteBuffer, int position, int limit, byte b) Fill the ByteBuffer's part [position, limit) with the specific byte value starting from the ByteBuffer's position won't be changed.
static void	get(ByteBuffer srcBuffer, byte[] dstBytes, int dstOffset, int length)
static Appender<Buffer>	getBufferAppender(boolean isCompositeBufferDisposable) Get the Appender which knows how to append Buffers.
static void	put(Buffer src, int position, int length, Buffer dstBuffer)
static void	put(byte[] srcBytes, int srcOffset, int length, ByteBuffer dstBuffer)
static void	put(ByteBuffer srcBuffer, int srcOffset, int length, ByteBuffer dstBuffer)
static long	readFromFileChannel(FileChannel fileChannel, Buffer buffer) Reads data from the FileChannel into the Buffer.
static void	setPositionLimit(Buffer buffer, int position, int limit)
static void	setPositionLimit(ByteBuffer buffer, int position, int limit)
static ByteBuffer	slice(ByteBuffer chunk, int size) Slice ByteBuffer of required size from big chunk.
static ByteBuffer	slice(ByteBuffer byteBuffer, int position, int limit) Get the ByteBuffer's slice basing on its passed position and limit.
String	toStringContent(Buffer buffer, int headBytesCount, int tailBytesCount) Returns the Buffer's String representation in a form: Buffer#toString() + "[" + + "..." + + "]" For example:
String	toStringContent(Buffer buffer, int headBytesCount, int tailBytesCount, Charset charset) Returns the Buffer's String representation in a form: Buffer#toString() + "[" + + "..." + + "]" For example:
static String	toStringContent(ByteBuffer byteBuffer, Charset charset, int position, int limit)
static Buffer	wrap(MemoryManager memoryManager, byte[] array) Returns Buffer, which wraps the byte array.
static Buffer	wrap(MemoryManager memoryManager, byte[] array, int offset, int length) Returns Buffer, which wraps the part of byte array with specific offset and length.
static Buffer	wrap(MemoryManager memoryManager, ByteBuffer byteBuffer) Returns Buffer, which wraps the ByteBuffer.
static Buffer	wrap(MemoryManager memoryManager, String s) Returns Buffer, which wraps the String.
static Buffer	wrap(MemoryManager memoryManager, String s, Charset charset) Returns Buffer, which wraps the String with the specific Charset.
static long	writeToFileChannel(FileChannel fileChannel, Buffer buffer) Writes data from the Buffer into the FileChannel.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_BYTE_BUFFER

public static final ByteBuffer EMPTY_BYTE_BUFFER

EMPTY_BYTE_BUFFER_ARRAY

public static final ByteBuffer[] EMPTY_BYTE_BUFFER_ARRAY

EMPTY_BUFFER

public static final Buffer EMPTY_BUFFER

Constructor Detail

Buffers

public Buffers()

Method Detail

getBufferAppender

public static Appender<Buffer> getBufferAppender(boolean isCompositeBufferDisposable)

Get the Appender which knows how to append Buffers. Returned Appender uses the same Buffer appending rules as described here appendBuffers(org.glassfish.grizzly.memory.MemoryManager, org.glassfish.grizzly.Buffer, org.glassfish.grizzly.Buffer, boolean).

Parameters:

isCompositeBufferDisposable - if as the result of Buffers appending a new CompositeBuffer will be created - its Buffer.allowBufferDispose(boolean) value will be set according to this parameter.

Returns:

the Buffer Appender.

wrap

public static Buffer wrap(MemoryManager memoryManager,
          String s)

Returns Buffer, which wraps the String.

Parameters:

memoryManager - MemoryManager, which should be used for wrapping.

s - String

Returns:

Buffer wrapper on top of passed String.

wrap

public static Buffer wrap(MemoryManager memoryManager,
          String s,
          Charset charset)

Returns Buffer, which wraps the String with the specific Charset.

Parameters:

memoryManager - MemoryManager, which should be used for wrapping.

s - String

charset - Charset, which will be used, when converting String to byte array.

Returns:

Buffer wrapper on top of passed String.

wrap

public static Buffer wrap(MemoryManager memoryManager,
          byte[] array)

Returns Buffer, which wraps the byte array.

Parameters:

memoryManager - MemoryManager, which should be used for wrapping.

array - byte array to wrap.

Returns:

Buffer wrapper on top of passed byte array.

wrap

public static Buffer wrap(MemoryManager memoryManager,
          byte[] array,
          int offset,
          int length)

Returns Buffer, which wraps the part of byte array with specific offset and length.

Parameters:

memoryManager - MemoryManager, which should be used for wrapping.

array - byte array to wrap

offset - byte buffer offset

length - byte buffer length

Returns:

Buffer wrapper on top of passed byte array.

wrap

public static Buffer wrap(MemoryManager memoryManager,
          ByteBuffer byteBuffer)

Returns Buffer, which wraps the ByteBuffer.

Parameters:

memoryManager - MemoryManager, which should be used for wrapping.

byteBuffer - ByteBuffer to wrap

Returns:

Buffer wrapper on top of passed ByteBuffer.

slice

public static ByteBuffer slice(ByteBuffer chunk,
               int size)

Slice ByteBuffer of required size from big chunk. Passed chunk position will be changed, after the slicing (chunk.position += size).

Parameters:

chunk - big ByteBuffer pool.

size - required slice size.

Returns:

sliced ByteBuffer of required size.

slice

public static ByteBuffer slice(ByteBuffer byteBuffer,
               int position,
               int limit)

Get the ByteBuffer's slice basing on its passed position and limit. Position and limit values of the passed ByteBuffer won't be changed. The result ByteBuffer position will be equal to 0, and limit equal to number of sliced bytes (limit - position).

Parameters:

byteBuffer - ByteBuffer to slice/

position - the position in the passed byteBuffer, the slice will start from.

limit - the limit in the passed byteBuffer, the slice will be ended.

Returns:

sliced ByteBuffer of required size.

toStringContent

public static String toStringContent(ByteBuffer byteBuffer,
                     Charset charset,
                     int position,
                     int limit)

setPositionLimit

public static void setPositionLimit(Buffer buffer,
                    int position,
                    int limit)

setPositionLimit

public static void setPositionLimit(ByteBuffer buffer,
                    int position,
                    int limit)

put

public static void put(ByteBuffer srcBuffer,
       int srcOffset,
       int length,
       ByteBuffer dstBuffer)

put

public static void put(Buffer src,
       int position,
       int length,
       Buffer dstBuffer)

get

public static void get(ByteBuffer srcBuffer,
       byte[] dstBytes,
       int dstOffset,
       int length)

put

public static void put(byte[] srcBytes,
       int srcOffset,
       int length,
       ByteBuffer dstBuffer)

appendBuffers

public static Buffer appendBuffers(MemoryManager memoryManager,
                   Buffer buffer1,
                   Buffer buffer2)

Append two Buffers. If one of the Buffers is null - then another Buffer will be returned as result. If the first Buffer is CompositeBuffer then the second Buffer will be appended to it via CompositeBuffer#append(java.lang.Object), else if the second Buffer is CompositeBuffer then the first Buffer will be prepended to it via CompositeBuffer.prepend(org.glassfish.grizzly.Buffer). If none of the Buffer parameters is null nor CompositeBuffers - then new CompositeBuffer will be created and both Buffers will be added there. The resulting CompositeBuffer will be disallowed for disposal.

Parameters:

memoryManager - the MemoryManager to use if a new Buffer needs to be allocated in order to perform the requested operation.

buffer1 - the Buffer to append to.

buffer2 - the Buffer to append.

Returns:

the result of appending of two Buffers.

appendBuffers

public static Buffer appendBuffers(MemoryManager memoryManager,
                   Buffer buffer1,
                   Buffer buffer2,
                   boolean isCompositeBufferDisposable)

Append two Buffers. If one of the Buffers is null - then another Buffer will be returned as result. If the first Buffer is CompositeBuffer then the second Buffer will be appended to it via CompositeBuffer#append(java.lang.Object), else if the second Buffer is CompositeBuffer then the first Buffer will be prepended to it via CompositeBuffer.prepend(org.glassfish.grizzly.Buffer). If none of the Buffer parameters is null nor CompositeBuffers - then new CompositeBuffer will be created and both Buffers will be added there. The resulting CompositeBuffer will be assigned according to the isCompositeBufferDisposable parameter.

Parameters:

memoryManager - the MemoryManager to use if a new Buffer needs to be allocated in order to perform the requested operation.

buffer1 - the Buffer to append to.

buffer2 - the Buffer to append.

isCompositeBufferDisposable - flag indicating whether or not the resulting composite buffer may be disposed.

Returns:

the result of appending of two Buffers.

fill

public static void fill(Buffer buffer,
        byte b)

Fill the Buffer with the specific byte value. Buffer's position won't be changed.

Parameters:

buffer - Buffer

b - value

fill

public static void fill(Buffer buffer,
        int position,
        int limit,
        byte b)

Fill the Buffer's part [position, limit) with the specific byte value starting from the Buffer's position won't be changed.

Parameters:

buffer - Buffer

position - Buffer position to start with (inclusive)

limit - Buffer limit, where filling ends (exclusive)

b - value

fill

public static void fill(ByteBuffer byteBuffer,
        byte b)

Fill the ByteBuffer with the specific byte value. ByteBuffer's position won't be changed.

Parameters:

byteBuffer - ByteBuffer

b - value

fill

public static void fill(ByteBuffer byteBuffer,
        int position,
        int limit,
        byte b)

Fill the ByteBuffer's part [position, limit) with the specific byte value starting from the ByteBuffer's position won't be changed.

Parameters:

byteBuffer - ByteBuffer

position - ByteBuffer position to start with (inclusive)

limit - Buffer limit, where filling ends (exclusive)

b - value

cloneBuffer

public static Buffer cloneBuffer(Buffer srcBuffer)

Clones the source Buffer. The method returns a new Buffer instance, which has the same content. Please note, source and result Buffers have the same content, but it is *not* shared, so the following content changes in one of the Buffers won't be visible in another one.

Parameters:

srcBuffer - the source Buffer.

Returns:

the cloned Buffer.

cloneBuffer

public static Buffer cloneBuffer(Buffer srcBuffer,
                 int position,
                 int limit)

Clones the source Buffer. The method returns a new Buffer instance, which has the same content. Please note, source and result Buffers have the same content, but it is *not* shared, so the following content changes in one of the Buffers won't be visible in another one.

Parameters:

srcBuffer - the source Buffer.

position - the start position in the srcBuffer

limit - the end position in the srcBuffer

Returns:

the cloned Buffer.

readFromFileChannel

public static long readFromFileChannel(FileChannel fileChannel,
                       Buffer buffer)
                                throws IOException

Reads data from the FileChannel into the Buffer.

Parameters:

fileChannel - the FileChannel to read data from.

buffer - the destination Buffer.

Returns:

the number of bytes read, or -1 if the end of file is reached.

Throws:

IOException

writeToFileChannel

public static long writeToFileChannel(FileChannel fileChannel,
                      Buffer buffer)
                               throws IOException

Writes data from the Buffer into the FileChannel.

Parameters:

fileChannel - the FileChannel to write data to.

buffer - the source Buffer.

Returns:

the number of bytes written, possibly zero.

Throws:

IOException

toStringContent

public String toStringContent(Buffer buffer,
                     int headBytesCount,
                     int tailBytesCount)

Returns the Buffer's String representation in a form: Buffer#toString() + "[" + + "..." + + "]" For example:

HeapBuffer (1781633478) [pos=0 lim=285 cap=285][abcde...xyz]

Parameters:

buffer - the Buffer, could be null

headBytesCount - the number of heading bytes to include (larger or equal to 0)

tailBytesCount - the number of tailing bytes to include (larger or equal to 0)

Returns:

the Buffer's String representation, or null, if the Buffer is null

toStringContent

public String toStringContent(Buffer buffer,
                     int headBytesCount,
                     int tailBytesCount,
                     Charset charset)

Returns the Buffer's String representation in a form: Buffer#toString() + "[" + + "..." + + "]" For example:

HeapBuffer (1781633478) [pos=0 lim=285 cap=285][abcde...xyz]

Parameters:

buffer - the Buffer, could be null

headBytesCount - the number of heading bytes to include (larger or equal to 0)

tailBytesCount - the number of tailing bytes to include (larger or equal to 0)

charset - Charset, if null the Charset.defaultCharset() will be used

Returns:

the Buffer's String representation, or null, if the Buffer is null