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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, ByteSequence, java.lang.Cloneable

public 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.
boolean	equals(java.lang.Object o) Compare two ReadBuffer objects for equality.
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) Return a Binary object that holds the specified portion of this ReadBuffer.
byte[]	toByteArray(int of, int cb) Get a portion of the contents of the ReadBuffer as a byte array.
java.nio.ByteBuffer	toByteBuffer() Return a read-only ByteBuffer view of this ReadBuffer.
java.nio.ByteBuffer	toByteBuffer(int of, int cb) Return a read-only ByteBuffer view of the specified portion of this ReadBuffer.
void	writeTo(java.nio.ByteBuffer buf) Write the contents of the Binary object to a ByteBuffer.
void	writeTo(java.nio.ByteBuffer buf, int of, int cb) Write the contents of the Binary object to a ByteBuffer.
void	writeTo(java.io.DataOutput out) Write the contents of this ReadBuffer to a DataOutput.
void	writeTo(java.io.DataOutput out, int of, int cb) Write the contents of this ReadBuffer to a DataOutput.
void	writeTo(java.io.OutputStream out) Write the contents of this ReadBuffer to an OutputStream.
void	writeTo(java.io.OutputStream out, int of, int cb) Write the contents of the ReadBuffer to an OutputStream.

Methods inherited from class com.tangosol.io.AbstractReadBuffer

checkBounds, clone, getBufferInput, getReadBuffer, readPackedInt, readUnsignedByte, sizeofPackedInt, subSequence, 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

writeTo

public void writeTo(java.io.OutputStream out)
             throws java.io.IOException

Write the contents of this ReadBuffer to an OutputStream.

Parameters:

out - an OutputStream to write to

Throws:

java.io.IOException - if an I/O exception occurs

writeTo

public void writeTo(java.io.OutputStream out,
                    int of,
                    int cb)
             throws java.io.IOException

Write the contents of the ReadBuffer to an OutputStream.

Parameters:

out - an OutputStream to write to

of - the beginning index, inclusive

cb - the number of bytes to write to an OutputStream

Throws:

java.io.IOException - if an I/O exception occurs

writeTo

public void writeTo(java.io.DataOutput out)
             throws java.io.IOException

Write the contents of this ReadBuffer to a DataOutput.

Parameters:

out - a DataOutput to write to

Throws:

java.io.IOException - if an I/O exception occurs

writeTo

public void writeTo(java.io.DataOutput out,
                    int of,
                    int cb)
             throws java.io.IOException

Write the contents of this ReadBuffer to a DataOutput.

Parameters:

out - a DataOutput to write to

of - the beginning index, inclusive

cb - the number of bytes to write to a DataOutput

Throws:

java.io.IOException - if an I/O exception occurs

writeTo

public void writeTo(java.nio.ByteBuffer buf)

Write the contents of the Binary object to a ByteBuffer.

Parameters:

buf - a ByteBuffer to write to

writeTo

public void writeTo(java.nio.ByteBuffer buf,
                    int of,
                    int cb)
             throws java.io.IOException

Write the contents of the Binary object to a ByteBuffer.

Parameters:

buf - an ByteBuffer to write to

of - the beginning index, inclusive

cb - the number of bytes to write to a ByteBuffer

Throws:

java.io.IOException - if an I/O exception occurs

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 sub-array 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 method is an 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)

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

This method is an 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

toByteBuffer

public java.nio.ByteBuffer toByteBuffer()

Return a read-only ByteBuffer view of this ReadBuffer. This view may or may not reflect any subsequent changes made to the underlying content.

Returns:

a read-only ByteBuffer view of this ReadBuffer

toByteBuffer

public java.nio.ByteBuffer toByteBuffer(int of,
                                        int cb)

Return a read-only ByteBuffer view of the specified portion of this ReadBuffer. This view may or may not reflect any subsequent changes made to the underlying content.

This method is an equivalent of getReadBuffer(of, cb).toByteBuffer().

Parameters:

of - the beginning index, inclusive

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

Returns:

a read-only ByteBuffer view of the specified portion of this ReadBuffer

equals

public boolean equals(java.lang.Object o)

Compare two ReadBuffer objects for equality.

Specified by:

equals in interface ReadBuffer

Overrides:

equals in class AbstractReadBuffer

Parameters:

o - a ReadBuffer object

Returns:

true iff the other ReadBuffer is identical to this

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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