```
public interface Buffer
```
Represents an abstract view for one or more primitive byte arrays and NIO buffers.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`capacity()`	Returns the number of bytes (octets) this buffer can contain.
`Buffer`	`getBytes(int index, byte[] dst)`	Transfers this buffer's data to the specified destination starting at the specified absolute `index`.
`boolean`	`isDirect()`	Returns `true` if and only if this buffer is backed by an NIO direct buffer.
`Buffer`	`markWriterIndex()`	Marks the current writer index in this buffer.
`ByteBuffer`	`nioBuffer()`	Exposes this buffer's readable bytes as a NIO `ByteBuffer`.
`ByteBuffer`	`nioBuffer(int index, int length)`	Exposes this buffer's sub-region as an NIO `ByteBuffer`.
`int`	`nioBufferCount()`	Returns the maximum number of NIO `ByteBuffer`s that consist this buffer.
`ByteBuffer[]`	`nioBuffers()`	Exposes this buffer's readable bytes as NIO ByteBuffer's instances.
`ByteBuffer[]`	`nioBuffers(int index, int length)`	Exposes this buffer's readable bytes as NIO ByteBuffer's instances.
`int`	`readableBytes()`	Returns the number of readable bytes.
`boolean`	`readBoolean()`	Gets a boolean and advances the reader index.
`byte`	`readByte()`	Gets a byte and advances the reader index.
`Buffer`	`readBytes(byte[] destination)`	Transfers this buffer's data to the specified destination starting at the current reader index and advances the reader index.
`Buffer`	`readBytes(byte[] destination, int dstIndex, int length)`	Transfers this buffer's data to the specified destination starting at the current reader index and advances the reader index.
`Buffer`	`readBytes(OutputStream out, int length)`	Transfers this buffer's data to the specified stream starting at the current reader index and advances the index.
`Buffer`	`readBytes(ByteBuffer dst)`	Transfers this buffer's data to the specified destination starting at the current reader index until the destination's position reaches its limit, and advances the reader index.
`double`	`readDouble()`	Gets a 64-bit floating point number and advances the reader index.
`int`	`readerIndex()`	Returns the reader index of this buffer.
`Buffer`	`readerIndex(int readerIndex)`	Sets the reader index of this buffer.
`float`	`readFloat()`	Gets a 32-bit floating point number and advances the reader index.
`int`	`readInt()`	Gets a 32-bit integer at the current index and advances the reader index.
`long`	`readLong()`	Gets a 64-bit integer and advances the reader index.
`short`	`readShort()`	Gets a 16-bit short integer and advances the reader index.
`int`	`referenceCount()`	Returns the reference count of this object.
`boolean`	`release()`	Decreases the reference count by `1` and deallocates this object if the reference count reaches at `0`.
`Buffer`	`resetWriterIndex()`	Repositions the current writer index to the marked index in this buffer.
`Buffer`	`retain()`	Increases the reference count by `1`.
`Buffer`	`writeBoolean(boolean value)`	Sets the specified boolean at the current writer index and advances the index.
`Buffer`	`writeByte(int value)`	Sets the specified byte at the current writer index and advances the index.
`Buffer`	`writeBytes(byte[] src)`	Transfers the specified source array's data to this buffer starting at the current writer index and advances the index.
`Buffer`	`writeBytes(byte[] src, int srcIndex, int length)`	Transfers the specified source array's data to this buffer starting at the current writer index and advances the index.
`Buffer`	`writeBytes(ByteBuffer src)`	Transfers the specified source byte data to this buffer starting at the current writer index and advances the index.
`Buffer`	`writeDouble(double value)`	Sets the specified 64-bit floating point number at the current writer index and advances the index.
`Buffer`	`writeFloat(float value)`	Sets the specified 32-bit floating point number at the current writer index and advances the index.
`Buffer`	`writeInt(int value)`	Sets the specified 32-bit integer at the current writer index and advances the index.
`Buffer`	`writeLong(long value)`	Sets the specified 64-bit long integer at the current writer index and advances the index.
`int`	`writerIndex()`	Returns the writer index of this buffer.
`Buffer`	`writerIndex(int writerIndex)`	Sets the writer index of this buffer.
`Buffer`	`writeShort(int value)`	Sets the specified 16-bit short integer at the current writer index and advances the index.

- Method Detail
  - readableBytes
```
int readableBytes()
```
    Returns the number of readable bytes.
  - readerIndex
```
int readerIndex()
```
    Returns the reader index of this buffer.
  - readerIndex
```
Buffer readerIndex(int readerIndex)
```
    Sets the reader index of this buffer.
    
    Throws:
    
    IndexOutOfBoundsException - if its out of bounds.
  - writerIndex
```
int writerIndex()
```
    Returns the writer index of this buffer.
  - writerIndex
```
Buffer writerIndex(int writerIndex)
```
    Sets the writer index of this buffer.
  - markWriterIndex
```
Buffer markWriterIndex()
```
    Marks the current writer index in this buffer.
  - resetWriterIndex
```
Buffer resetWriterIndex()
```
    Repositions the current writer index to the marked index in this buffer.
  - capacity
```
int capacity()
```
    Returns the number of bytes (octets) this buffer can contain.
  - isDirect
```
boolean isDirect()
```
    Returns true if and only if this buffer is backed by an NIO direct buffer.
  - readBoolean
```
boolean readBoolean()
```
    Gets a boolean and advances the reader index.
  - readByte
```
byte readByte()
```
    Gets a byte and advances the reader index.
  - readShort
```
short readShort()
```
    Gets a 16-bit short integer and advances the reader index.
  - readInt
```
int readInt()
```
    Gets a 32-bit integer at the current index and advances the reader index.
  - readLong
```
long readLong()
```
    Gets a 64-bit integer and advances the reader index.
  - readFloat
```
float readFloat()
```
    Gets a 32-bit floating point number and advances the reader index.
  - readDouble
```
double readDouble()
```
    Gets a 64-bit floating point number and advances the reader index.
  - readBytes
```
Buffer readBytes(byte[] destination)
```
    Transfers this buffer's data to the specified destination starting at the current reader index and advances the reader index.
  - readBytes
```
Buffer readBytes(byte[] destination,
                 int dstIndex,
                 int length)
```
    Transfers this buffer's data to the specified destination starting at the current reader index and advances the reader index.
    
    Parameters:
    
    destination - The destination buffer
    
    dstIndex - the first index of the destination
    
    length - the number of bytes to transfer
  - readBytes
```
Buffer readBytes(ByteBuffer dst)
```
    Transfers this buffer's data to the specified destination starting at the current reader index until the destination's position reaches its limit, and advances the reader index.
  - readBytes
```
Buffer readBytes(OutputStream out,
                 int length)
          throws IOException
```
    Transfers this buffer's data to the specified stream starting at the current reader index and advances the index.
    
    Parameters:
    
    length - the number of bytes to transfer
    
    Throws:
    
    IOException - if the specified stream threw an exception during I/O
  - writeBoolean
```
Buffer writeBoolean(boolean value)
```
    Sets the specified boolean at the current writer index and advances the index.
  - writeByte
```
Buffer writeByte(int value)
```
    Sets the specified byte at the current writer index and advances the index.
  - writeShort
```
Buffer writeShort(int value)
```
    Sets the specified 16-bit short integer at the current writer index and advances the index.
  - writeInt
```
Buffer writeInt(int value)
```
    Sets the specified 32-bit integer at the current writer index and advances the index.
  - writeLong
```
Buffer writeLong(long value)
```
    Sets the specified 64-bit long integer at the current writer index and advances the index.
  - writeFloat
```
Buffer writeFloat(float value)
```
    Sets the specified 32-bit floating point number at the current writer index and advances the index.
  - writeDouble
```
Buffer writeDouble(double value)
```
    Sets the specified 64-bit floating point number at the current writer index and advances the index.
  - writeBytes
```
Buffer writeBytes(byte[] src)
```
    Transfers the specified source array's data to this buffer starting at the current writer index and advances the index.
  - writeBytes
```
Buffer writeBytes(ByteBuffer src)
```
    Transfers the specified source byte data to this buffer starting at the current writer index and advances the index.
  - writeBytes
```
Buffer writeBytes(byte[] src,
                  int srcIndex,
                  int length)
```
    Transfers the specified source array's data to this buffer starting at the current writer index and advances the index.
  - release
```
boolean release()
```
    Decreases the reference count by 1 and deallocates this object if the reference count reaches at 0.
  - retain
```
Buffer retain()
```
    Increases the reference count by 1.
  - referenceCount
```
int referenceCount()
```
    Returns the reference count of this object.
  - nioBufferCount
```
int nioBufferCount()
```
    Returns the maximum number of NIO ByteBuffers that consist this buffer.
  - nioBuffers
```
ByteBuffer[] nioBuffers()
```
    Exposes this buffer's readable bytes as NIO ByteBuffer's instances.
  - nioBuffers
```
ByteBuffer[] nioBuffers(int index,
                        int length)
```
    Exposes this buffer's readable bytes as NIO ByteBuffer's instances.
  - nioBuffer
```
ByteBuffer nioBuffer()
```
    Exposes this buffer's readable bytes as a NIO ByteBuffer. The returned buffer either share or contains the copied content of this buffer, while changing the position and limit of the returned NIO buffer does not affect the indexes and marks of this buffer.
  - nioBuffer
```
ByteBuffer nioBuffer(int index,
                     int length)
```
    Exposes this buffer's sub-region as an NIO ByteBuffer.
  - getBytes
```
Buffer getBytes(int index,
                byte[] dst)
```
    Transfers this buffer's data to the specified destination starting at the specified absolute index. This method does not modify reader or writer indexes.

Interface Buffer

Method Summary

Method Detail

readableBytes

readerIndex

readerIndex

writerIndex

writerIndex

markWriterIndex

resetWriterIndex

capacity

isDirect

readBoolean

readByte

readShort

readInt

readLong

readFloat

readDouble

readBytes

readBytes

readBytes

readBytes

writeBoolean

writeByte

writeShort

writeInt

writeLong

writeFloat

writeDouble

writeBytes

writeBytes

writeBytes

release

retain

referenceCount

nioBufferCount

nioBuffers

nioBuffers

nioBuffer

nioBuffer

getBytes