com.sun.enterprise.mgmt.transport.buffers
Interface Buffer

All Superinterfaces:

Comparable<Buffer>

All Known Implementing Classes:

ByteBuffersBuffer

public interface Buffer
extends Comparable<Buffer>

JDK ByteBuffer was taken as base for Grizzly Buffer interface, but Buffer has several extensions: it's possible to prepend some data to a Buffer and release Buffer, when it's not required any more.

Author:

Alexey Stashok

Method Summary

int	capacity() Returns this buffer's capacity.
Buffer	clear() Clears this buffer.
void	dispose() Notify the allocator that the space for this Buffer is no longer needed.
Buffer	duplicate() Creates a new Buffer that shares this buffer's content.
Buffer	flip() Flips this buffer.
byte	get() Relative get method.
Buffer	get(byte[] dst) Relative bulk get method.
Buffer	get(byte[] dst, int offset, int length) Relative bulk get method.
byte	get(int index) Absolute get method.
char	getChar() Relative get method for reading a char value.
char	getChar(int index) Absolute get method for reading a char value.
double	getDouble() Relative get method for reading a double value.
double	getDouble(int index) Absolute get method for reading a double value.
float	getFloat() Relative get method for reading a float value.
float	getFloat(int index) Absolute get method for reading a float value.
int	getInt() Relative get method for reading an int value.
int	getInt(int index) Absolute get method for reading an int value.
long	getLong() Relative get method for reading a long value.
long	getLong(int index) Absolute get method for reading a long value.
short	getShort() Relative get method for reading a short value.
short	getShort(int index) Absolute get method for reading a short value.
boolean	hasRemaining() Tells whether there are any elements between the current position and the limit.
int	limit() Returns this buffer's limit.
Buffer	limit(int newLimit) Sets this buffer's limit.
Buffer	mark() Sets this buffer's mark at its position.
int	position() Returns this buffer's position.
Buffer	position(int newPosition) Sets this buffer's position.
Buffer	put(byte b) Relative put method (optional operation).
Buffer	put(byte[] src) Relative bulk put method (optional operation).
Buffer	put(byte[] src, int offset, int length) Relative bulk put method (optional operation).
Buffer	put(int index, byte b) Absolute put method (optional operation).
Buffer	putChar(char value) Relative put method for writing a char value (optional operation).
Buffer	putChar(int index, char value) Absolute put method for writing a char value (optional operation).
Buffer	putDouble(double value) Relative put method for writing a double value (optional operation).
Buffer	putDouble(int index, double value) Absolute put method for writing a double value (optional operation).
Buffer	putFloat(float value) Relative put method for writing a float value (optional operation).
Buffer	putFloat(int index, float value) Absolute put method for writing a float value (optional operation).
Buffer	putInt(int value) Relative put method for writing an int value (optional operation).
Buffer	putInt(int index, int value) Absolute put method for writing an int value (optional operation).
Buffer	putLong(int index, long value) Absolute put method for writing a long value (optional operation).
Buffer	putLong(long value) Relative put method for writing a long value (optional operation).
Buffer	putShort(int index, short value) Absolute put method for writing a short value (optional operation).
Buffer	putShort(short value) Relative put method for writing a short value (optional operation).
int	remaining() Returns the number of elements between the current position and the limit.
Buffer	reset() Resets this buffer's position to the previously-marked position.
Buffer	rewind() Rewinds this buffer.
void	shrink() Disposes the buffer part, outside [position, limit] interval if possible.
String	toStringContent() Returns Buffer content as String, using default Charset
String	toStringContent(Charset charset) Returns Buffer content as String
String	toStringContent(Charset charset, int position, int limit) Returns Buffer's chunk content as String
Object	underlying() Return the underlying buffer

Methods inherited from interface java.lang.Comparable

compareTo

Method Detail

duplicate

Buffer duplicate()

Creates a new Buffer that shares this buffer's content.

The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffer's position, limit, and mark values will be independent.

The new buffer's capacity, limit, position, and mark values will be identical to those of this buffer. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.

Returns:

The new Buffer

shrink

void shrink()

Disposes the buffer part, outside [position, limit] interval if possible. May return without changing capacity. After shrink is called, position/limit/capacity values may have different values, than before, but still point to the same Buffer elements.

dispose

void dispose()

Notify the allocator that the space for this Buffer is no longer needed. All calls to methods on a Buffer will fail after a call to dispose().

underlying

Object underlying()

Return the underlying buffer

Returns:

the underlying buffer

capacity

int capacity()

Returns this buffer's capacity.

Returns:

The capacity of this buffer

position

int position()

Returns this buffer's position.

Returns:

The position of this buffer

position

Buffer position(int newPosition)

Sets this buffer's position. If the mark is defined and larger than the new position then it is discarded.

Parameters:

newPosition - The new position value; must be non-negative and no larger than the current limit

Returns:

This buffer

Throws:

IllegalArgumentException - If the preconditions on newPosition do not hold

limit

int limit()

Returns this buffer's limit.

Returns:

The limit of this buffer

limit

Buffer limit(int newLimit)

Sets this buffer's limit. If the position is larger than the new limit then it is set to the new limit. If the mark is defined and larger than the new limit then it is discarded.

Parameters:

newLimit - The new limit value; must be non-negative and no larger than this buffer's capacity

Returns:

This buffer

Throws:

IllegalArgumentException - If the preconditions on newLimit do not hold

mark

Buffer mark()

Sets this buffer's mark at its position.

Returns:

This buffer

reset

Buffer reset()

Resets this buffer's position to the previously-marked position.

Invoking this method neither changes nor discards the mark's value.

Returns:

This buffer

Throws:

InvalidMarkException - If the mark has not been set

clear

Buffer clear()

Clears this buffer. The position is set to zero, the limit is set to the capacity, and the mark is discarded.

Invoke this method before using a sequence of channel-read or put operations to fill this buffer. For example:

 buf.clear();     // Prepare buffer for reading
 in.read(buf);    // Read data

This method does not actually erase the data in the buffer, but it is named as if it did because it will most often be used in situations in which that might as well be the case.

Returns:

This buffer

flip

Buffer flip()

Flips this buffer. The limit is set to the current position and then the position is set to zero. If the mark is defined then it is discarded.

After a sequence of channel-read or put operations, invoke this method to prepare for a sequence of channel-write or relative get operations. For example:

 buf.put(magic);    // Prepend header
 in.read(buf);      // Read data into rest of buffer
 buf.flip();        // Flip buffer
 out.write(buf);    // Write header + data to channel

This method is often used in conjunction with the com.sun.enterprise.mgmt.transport.Buffer#trimLeft() method when transferring data from one place to another.

Returns:

This buffer

rewind

Buffer rewind()

Rewinds this buffer. The position is set to zero and the mark is discarded.

Invoke this method before a sequence of channel-write or get operations, assuming that the limit has already been set appropriately. For example:

 out.write(buf);    // Write remaining data
 buf.rewind();      // Rewind buffer
 buf.get(array);    // Copy data into array

Returns:

This buffer

remaining

int remaining()

Returns the number of elements between the current position and the limit.

Returns:

The number of elements remaining in this buffer

hasRemaining

boolean hasRemaining()

Tells whether there are any elements between the current position and the limit.

Returns:

true if, and only if, there is at least one element remaining in this buffer

get

byte get()

Relative get method. Reads the byte at this buffer's current position, and then increments the position.

Returns:

The byte at the buffer's current position

Throws:

BufferUnderflowException - If the buffer's current position is not smaller than its limit

put

Buffer put(byte b)

Relative put method (optional operation).

Writes the given byte into this buffer at the current position, and then increments the position.

Parameters:

b - The byte to be written

Returns:

This buffer

Throws:

BufferOverflowException - If this buffer's current position is not smaller than its limit

ReadOnlyBufferException - If this buffer is read-only

get

byte get(int index)

Absolute get method. Reads the byte at the given index.

Parameters:

index - The index from which the byte will be read

Returns:

The byte at the given index

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit

put

Buffer put(int index,
           byte b)

Absolute put method (optional operation).

Writes the given byte into this buffer at the given index.

Parameters:

index - The index at which the byte will be written

b - The byte value to be written

Returns:

This buffer

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit

ReadOnlyBufferException - If this buffer is read-only

get

Buffer get(byte[] dst,
           int offset,
           int length)

Relative bulk get method.

This method transfers bytes from this buffer into the given destination array. If there are fewer bytes remaining in the buffer than are required to satisfy the request, that is, if length > remaining(), then no bytes are transferred and a BufferUnderflowException is thrown.

Otherwise, this method copies length bytes from this buffer into the given array, starting at the current position of this buffer and at the given offset in the array. The position of this buffer is then incremented by length.

In other words, an invocation of this method of the form src.get(dst, off, len) has exactly the same effect as the loop

     for (int i = off; i < off + len; i++)
         dst[i] = src.get(); 

except that it first checks that there are sufficient bytes in this buffer and it is potentially much more efficient.

Parameters:

dst - The array into which bytes are to be written

offset - The offset within the array of the first byte to be written; must be non-negative and no larger than dst.length

length - The maximum number of bytes to be written to the given array; must be non-negative and no larger than dst.length - offset

Returns:

This buffer

Throws:

BufferUnderflowException - If there are fewer than length bytes remaining in this buffer

IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold

get

Buffer get(byte[] dst)

Relative bulk get method.

This method transfers bytes from this buffer into the given destination array. An invocation of this method of the form src.get(a) behaves in exactly the same way as the invocation

     src.get(a, 0, a.length) 

Returns:

This buffer

Throws:

BufferUnderflowException - If there are fewer than length bytes remaining in this buffer

put

Buffer put(byte[] src,
           int offset,
           int length)

Relative bulk put method (optional operation).

This method transfers bytes into this buffer from the given source array. If there are more bytes to be copied from the array than remain in this buffer, that is, if length > remaining(), then no bytes are transferred and a BufferOverflowException is thrown.

Otherwise, this method copies length bytes from the given array into this buffer, starting at the given offset in the array and at the current position of this buffer. The position of this buffer is then incremented by length.

In other words, an invocation of this method of the form dst.put(src, off, len) has exactly the same effect as the loop

     for (int i = off; i < off + len; i++)
         dst.put(a[i]); 

except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.

Parameters:

src - The array from which bytes are to be read

offset - The offset within the array of the first byte to be read; must be non-negative and no larger than array.length

length - The number of bytes to be read from the given array; must be non-negative and no larger than array.length - offset

Returns:

This buffer

Throws:

BufferOverflowException - If there is insufficient space in this buffer

IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold

ReadOnlyBufferException - If this buffer is read-only

put

Buffer put(byte[] src)

Relative bulk put method (optional operation).

This method transfers the entire content of the given source byte array into this buffer. An invocation of this method of the form dst.put(a) behaves in exactly the same way as the invocation

     dst.put(a, 0, a.length) 

Returns:

This buffer

Throws:

BufferOverflowException - If there is insufficient space in this buffer

ReadOnlyBufferException - If this buffer is read-only

getChar

char getChar()

Relative get method for reading a char value.

Reads the next two bytes at this buffer's current position, composing them into a char value according to the current byte order, and then increments the position by two.

Returns:

The char value at the buffer's current position

Throws:

BufferUnderflowException - If there are fewer than two bytes remaining in this buffer

putChar

Buffer putChar(char value)

Relative put method for writing a char value (optional operation).

Writes two bytes containing the given char value, in the current byte order, into this buffer at the current position, and then increments the position by two.

Parameters:

value - The char value to be written

Returns:

This buffer

Throws:

BufferOverflowException - If there are fewer than two bytes remaining in this buffer

ReadOnlyBufferException - If this buffer is read-only

getChar

char getChar(int index)

Absolute get method for reading a char value.

Reads two bytes at the given index, composing them into a char value according to the current byte order.

Parameters:

index - The index from which the bytes will be read

Returns:

The char value at the given index

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus one

putChar

Buffer putChar(int index,
               char value)

Absolute put method for writing a char value (optional operation).

Writes two bytes containing the given char value, in the current byte order, into this buffer at the given index.

Parameters:

index - The index at which the bytes will be written

value - The char value to be written

Returns:

This buffer

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus one

ReadOnlyBufferException - If this buffer is read-only

getShort

short getShort()

Relative get method for reading a short value.

Reads the next two bytes at this buffer's current position, composing them into a short value according to the current byte order, and then increments the position by two.

Returns:

The short value at the buffer's current position

Throws:

BufferUnderflowException - If there are fewer than two bytes remaining in this buffer

putShort

Buffer putShort(short value)

Relative put method for writing a short value (optional operation).

Writes two bytes containing the given short value, in the current byte order, into this buffer at the current position, and then increments the position by two.

Parameters:

value - The short value to be written

Returns:

This buffer

Throws:

BufferOverflowException - If there are fewer than two bytes remaining in this buffer

ReadOnlyBufferException - If this buffer is read-only

getShort

short getShort(int index)

Absolute get method for reading a short value.

Reads two bytes at the given index, composing them into a short value according to the current byte order.

Parameters:

index - The index from which the bytes will be read

Returns:

The short value at the given index

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus one

putShort

Buffer putShort(int index,
                short value)

Absolute put method for writing a short value (optional operation).

Writes two bytes containing the given short value, in the current byte order, into this buffer at the given index.

Parameters:

index - The index at which the bytes will be written

value - The short value to be written

Returns:

This buffer

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus one

ReadOnlyBufferException - If this buffer is read-only

getInt

int getInt()

Relative get method for reading an int value.

Reads the next four bytes at this buffer's current position, composing them into an int value according to the current byte order, and then increments the position by four.

Returns:

The int value at the buffer's current position

Throws:

BufferUnderflowException - If there are fewer than four bytes remaining in this buffer

putInt

Buffer putInt(int value)

Relative put method for writing an int value (optional operation).

Writes four bytes containing the given int value, in the current byte order, into this buffer at the current position, and then increments the position by four.

Parameters:

value - The int value to be written

Returns:

This buffer

Throws:

BufferOverflowException - If there are fewer than four bytes remaining in this buffer

ReadOnlyBufferException - If this buffer is read-only

getInt

int getInt(int index)

Absolute get method for reading an int value.

Reads four bytes at the given index, composing them into a int value according to the current byte order.

Parameters:

index - The index from which the bytes will be read

Returns:

The int value at the given index

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus three

putInt

Buffer putInt(int index,
              int value)

Absolute put method for writing an int value (optional operation).

Writes four bytes containing the given int value, in the current byte order, into this buffer at the given index.

Parameters:

index - The index at which the bytes will be written

value - The int value to be written

Returns:

This buffer

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus three

ReadOnlyBufferException - If this buffer is read-only

getLong

long getLong()

Relative get method for reading a long value.

Reads the next eight bytes at this buffer's current position, composing them into a long value according to the current byte order, and then increments the position by eight.

Returns:

The long value at the buffer's current position

Throws:

BufferUnderflowException - If there are fewer than eight bytes remaining in this buffer

putLong

Buffer putLong(long value)

Relative put method for writing a long value (optional operation).

Writes eight bytes containing the given long value, in the current byte order, into this buffer at the current position, and then increments the position by eight.

Parameters:

value - The long value to be written

Returns:

This buffer

Throws:

BufferOverflowException - If there are fewer than eight bytes remaining in this buffer

ReadOnlyBufferException - If this buffer is read-only

getLong

long getLong(int index)

Absolute get method for reading a long value.

Reads eight bytes at the given index, composing them into a long value according to the current byte order.

Parameters:

index - The index from which the bytes will be read

Returns:

The long value at the given index

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus seven

putLong

Buffer putLong(int index,
               long value)

Absolute put method for writing a long value (optional operation).

Writes eight bytes containing the given long value, in the current byte order, into this buffer at the given index.

Parameters:

index - The index at which the bytes will be written

value - The long value to be written

Returns:

This buffer

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus seven

ReadOnlyBufferException - If this buffer is read-only

getFloat

float getFloat()

Relative get method for reading a float value.

Reads the next four bytes at this buffer's current position, composing them into a float value according to the current byte order, and then increments the position by four.

Returns:

The float value at the buffer's current position

Throws:

BufferUnderflowException - If there are fewer than four bytes remaining in this buffer

putFloat

Buffer putFloat(float value)

Relative put method for writing a float value (optional operation).

Writes four bytes containing the given float value, in the current byte order, into this buffer at the current position, and then increments the position by four.

Parameters:

value - The float value to be written

Returns:

This buffer

Throws:

BufferOverflowException - If there are fewer than four bytes remaining in this buffer

ReadOnlyBufferException - If this buffer is read-only

getFloat

float getFloat(int index)

Absolute get method for reading a float value.

Reads four bytes at the given index, composing them into a float value according to the current byte order.

Parameters:

index - The index from which the bytes will be read

Returns:

The float value at the given index

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus three

putFloat

Buffer putFloat(int index,
                float value)

Absolute put method for writing a float value (optional operation).

Writes four bytes containing the given float value, in the current byte order, into this buffer at the given index.

Parameters:

index - The index at which the bytes will be written

value - The float value to be written

Returns:

This buffer

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus three

ReadOnlyBufferException - If this buffer is read-only

getDouble

double getDouble()

Relative get method for reading a double value.

Reads the next eight bytes at this buffer's current position, composing them into a double value according to the current byte order, and then increments the position by eight.

Returns:

The double value at the buffer's current position

Throws:

BufferUnderflowException - If there are fewer than eight bytes remaining in this buffer

putDouble

Buffer putDouble(double value)

Relative put method for writing a double value (optional operation).

Writes eight bytes containing the given double value, in the current byte order, into this buffer at the current position, and then increments the position by eight.

Parameters:

value - The double value to be written

Returns:

This buffer

Throws:

BufferOverflowException - If there are fewer than eight bytes remaining in this buffer

ReadOnlyBufferException - If this buffer is read-only

getDouble

double getDouble(int index)

Absolute get method for reading a double value.

Reads eight bytes at the given index, composing them into a double value according to the current byte order.

Parameters:

index - The index from which the bytes will be read

Returns:

The double value at the given index

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus seven

putDouble

Buffer putDouble(int index,
                 double value)

Absolute put method for writing a double value (optional operation).

Writes eight bytes containing the given double value, in the current byte order, into this buffer at the given index.

Parameters:

index - The index at which the bytes will be written

value - The double value to be written

Returns:

This buffer

Throws:

IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit, minus seven

ReadOnlyBufferException - If this buffer is read-only

toStringContent

String toStringContent()

Returns Buffer content as String, using default Charset

Returns:

String representation of this Buffer content.

toStringContent

String toStringContent(Charset charset)

Returns Buffer content as String

Parameters:

charset - the Charset, which will be use for byte[] -> String transformation.

Returns:

String representation of this Buffer content.

toStringContent

String toStringContent(Charset charset,
                       int position,
                       int limit)

Returns Buffer's chunk content as String

Parameters:

charset - the Charset, which will be use for byte[] -> String transformation.

position - the first byte offset in the Buffer (inclusive)

limit - the last byte offset in the Buffer (exclusive)

Returns:

String representation of part of this Buffer.