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com.tangosol.io
Class MultiBufferReadBuffer

java.lang.Object
com.tangosol.util.Base
com.tangosol.io.AbstractReadBuffer
com.tangosol.io.MultiBufferReadBuffer

All Implemented Interfaces:

ReadBuffer, Cloneable

public final class MultiBufferReadBuffer

extends AbstractReadBuffer

The MultiBufferReadBuffer is a ReadBuffer implementation that presents a view across any number of underlying ReadBuffer objects, as if they were appended end-to-end into a single ReadBuffer.

Author:

cp 2006.04.15

Nested Class Summary

class

MultiBufferReadBuffer.MultiBufferInput An implementation of the BufferInput interface that is backed by a series of the underlying ReadBuffer BufferInput objects.

Nested classes/interfaces inherited from class com.tangosol.io.AbstractReadBuffer

AbstractReadBuffer.AbstractBufferInput

Nested classes/interfaces inherited from interface com.tangosol.io.ReadBuffer

ReadBuffer.BufferInput

Field Summary

Fields inherited from class com.tangosol.io.AbstractReadBuffer

NO_BINARY, NO_BYTES

Constructor Summary

MultiBufferReadBuffer(ReadBuffer[] abuf)
Construct a MultiBufferReadBuffer from an array of underlying ReadBuffer objects.

Method Summary

byte	byteAt(int of) Returns the byte at the specified offset.
void	copyBytes(int ofBegin, int ofEnd, byte[] abDest, int ofDest) Copies bytes from this ReadBuffer into the destination byte array.
protected ReadBuffer	getBuffer(int iBuffer) Obtain the specified buffer.
protected int	getBufferCount() Determine the number of ReadBuffer objects that contain the data presented by this MultiBufferReadBuffer.
protected int	getBufferIndexByOffset(int of) Determine which underlying ReadBuffer contains the specified offset.
protected int	getBufferOffset(int iBuffer) Determine the offset of the specified buffer.
ReadBuffer.BufferInput	getDestructiveBufferInput() Return a self-destructing BufferInput over this Buffer.
protected ReadBuffer.BufferInput	instantiateBufferInput() Factory method: Instantiate a BufferInput object to read data from the ReadBuffer.
protected ReadBuffer.BufferInput	instantiateBufferInput(boolean fDestructive) Factory method: Instantiate a BufferInput object to read data from the ReadBuffer.
protected ReadBuffer	instantiateReadBuffer(int of, int cb) Factory method: Instantiate a ReadBuffer for a portion of this ReadBuffer.
int	length() Determine the length of the buffer.
protected ReadBuffer	releaseBuffer(int iBuffer) Release the specified buffer.
Binary	toBinary(int of, int cb) Returns a Binary object that holds the specified portion of this ReadBuffer. This is the equivalent of getReadBuffer(of, cb).toBinary().
byte[]	toByteArray(int of, int cb) Get a portion of the contents of the ReadBuffer as a byte array. This is the equivalent of getReadBuffer(of, cb).toByteArray().

Methods inherited from class com.tangosol.io.AbstractReadBuffer

checkBounds, clone, equals, getBufferInput, getReadBuffer, toBinary, toByteArray

Constructor Detail

MultiBufferReadBuffer

public MultiBufferReadBuffer(ReadBuffer[] abuf)

Construct a MultiBufferReadBuffer from an array of underlying ReadBuffer objects.

Parameters:

abuf - an array of ReadBuffer objects from which to construct this MultiBufferReadBuffer

Method Detail

getDestructiveBufferInput

public ReadBuffer.BufferInput getDestructiveBufferInput()

Return a self-destructing BufferInput over this Buffer. As the BufferInput is advanced the individual buffer segments will be released allowing them to potentially be garbage collected.

Returns:

a destructed BufferInput

length

public int length()

Determine the length of the buffer.

Returns:

the number of bytes of data represented by this ReadBuffer

byteAt

public byte byteAt(int of)

Returns the byte at the specified offset. An offset ranges from 0 to length() - 1. The first byte of the sequence is at offset 0, the next at offset 1, and so on, as for array indexing.

Parameters:

of - the offset (index) of the byte

Returns:

the byte at the specified offset in this ReadBuffer

copyBytes

public void copyBytes(int ofBegin,
                      int ofEnd,
                      byte[] abDest,
                      int ofDest)

Copies bytes from this ReadBuffer into the destination byte array.

The first byte to be copied is at offset ofBegin; the last byte to be copied is at offset ofEnd-1 (thus the total number of bytes to be copied is ofEnd - ofBegin). The bytes are copied into the subarray of abDest starting at offset ofDest and ending at index:

     ofDest + (ofEnd - ofBegin) - 1
 

This method is the ReadBuffer equivalent of String.getChars(int, int, char[], int). It allows the caller to extract a chunk of bytes into the caller's own array.

Parameters:

ofBegin - offset of the first byte in the ReadBuffer to copy

ofEnd - offset after the last byte in the ReadBuffer to copy

abDest - the destination byte array

ofDest - the offset in the destination byte array to copy the first byte to

toByteArray

public byte[] toByteArray(int of,
                          int cb)

Get a portion of the contents of the ReadBuffer as a byte array.

This is the equivalent of getReadBuffer(of, cb).toByteArray().

Specified by:

toByteArray in interface ReadBuffer

Overrides:

toByteArray in class AbstractReadBuffer

Parameters:

of - the beginning index, inclusive

cb - the number of bytes to include in the resulting byte[]

Returns:

a byte[] containing the specified portion of this ReadBuffer

toBinary

public Binary toBinary(int of,
                       int cb)

Returns a Binary object that holds the specified portion of this ReadBuffer.

This is the equivalent of getReadBuffer(of, cb).toBinary().

Specified by:

toBinary in interface ReadBuffer

Overrides:

toBinary in class AbstractReadBuffer

Parameters:

of - the beginning index, inclusive

cb - the number of bytes to include in the Binary object

Returns:

a Binary object containing the specified portion of this ReadBuffer

instantiateReadBuffer

protected ReadBuffer instantiateReadBuffer(int of,
                                           int cb)

Factory method: Instantiate a ReadBuffer for a portion of this ReadBuffer.

Specified by:

instantiateReadBuffer in class AbstractReadBuffer

Parameters:

of - the beginning index, inclusive

cb - the number of bytes to include in the resulting ReadBuffer

Returns:

a ReadBuffer that represents a portion of this ReadBuffer

instantiateBufferInput

protected ReadBuffer.BufferInput instantiateBufferInput()

Factory method: Instantiate a BufferInput object to read data from the ReadBuffer.

Specified by:

instantiateBufferInput in class AbstractReadBuffer

Returns:

a new BufferInput reading from this ReadBuffer

instantiateBufferInput

protected ReadBuffer.BufferInput instantiateBufferInput(boolean fDestructive)

Factory method: Instantiate a BufferInput object to read data from the ReadBuffer.

Parameters:

fDestructive - true iff the BufferInput should self-destruct as it is advanced

Returns:

a new BufferInput reading from this ReadBuffer

getBufferCount

protected int getBufferCount()

Determine the number of ReadBuffer objects that contain the data presented by this MultiBufferReadBuffer.

Returns:

the count of underlying ReadBuffer objects

getBufferOffset

protected int getBufferOffset(int iBuffer)

Determine the offset of the specified buffer. The offset of a buffer is the absolute offset of the first byte stored in the buffer.

Parameters:

iBuffer - an index 0 <= iBuffer < getBufferCount()

Returns:

the absolute offset of the first byte of the specified ReadBuffer

getBuffer

protected ReadBuffer getBuffer(int iBuffer)

Obtain the specified buffer.

Parameters:

iBuffer - an index 0 <= iBuffer < getBufferCount()

Returns:

the specified ReadBuffer

releaseBuffer

protected ReadBuffer releaseBuffer(int iBuffer)

Release the specified buffer. Once released any operation requiring access to overall buffer segment maintained by said buffer will result in an error. This method allows for "destructive streaming", see #getDestructiveBufferInput()

Parameters:

iBuffer - an index 0 <= iBuffer < getBufferCount()

Returns:

the released buffer

getBufferIndexByOffset

protected int getBufferIndexByOffset(int of)

Determine which underlying ReadBuffer contains the specified offset.

Parameters:

of - an offset into this MultiBufferReadBuffer

Returns:

the index of the ReadBuffer containing the specified offset

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