org.apache.hadoop.record

类 Buffer

java.lang.Object

org.apache.hadoop.record.Buffer

所有已实现的接口:

Cloneable, Comparable

public class Buffer
extends Object
implements Comparable, Cloneable

A byte sequence that is used as a Java native type for buffer. It is resizable and distinguishes between the count of the seqeunce and the current capacity.

构造器概要

构造器

构造器和说明
Buffer() Create a zero-count sequence.
Buffer(byte[] bytes) Create a Buffer using the byte array as the initial value.
Buffer(byte[] bytes, int offset, int length) Create a Buffer using the byte range as the initial value.

方法概要

方法

限定符和类型	方法和说明
void	append(byte[] bytes) Append specified bytes to the buffer
void	append(byte[] bytes, int offset, int length) Append specified bytes to the buffer.
Object	clone()
int	compareTo(Object other) Define the sort order of the Buffer.
void	copy(byte[] bytes, int offset, int length) Copy the specified byte array to the Buffer.
boolean	equals(Object other)
byte[]	get() Get the data from the Buffer.
int	getCapacity() Get the capacity, which is the maximum count that could handled without resizing the backing storage.
int	getCount() Get the current count of the buffer.
int	hashCode()
void	reset() Reset the buffer to 0 size
void	set(byte[] bytes) Use the specified bytes array as underlying sequence.
void	setCapacity(int newCapacity) Change the capacity of the backing storage.
String	toString()
String	toString(String charsetName) Convert the byte buffer to a string an specific character encoding
void	truncate() Change the capacity of the backing store to be the same as the current count of buffer.

从类继承的方法 java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

构造器详细资料

Buffer

public Buffer()

Create a zero-count sequence.

Buffer

public Buffer(byte[] bytes)

Create a Buffer using the byte array as the initial value.

参数:

bytes - This array becomes the backing storage for the object.

Buffer

public Buffer(byte[] bytes,
      int offset,
      int length)

Create a Buffer using the byte range as the initial value.

参数:

bytes - Copy of this array becomes the backing storage for the object.

offset - offset into byte array

length - length of data

方法详细资料

set

public void set(byte[] bytes)

Use the specified bytes array as underlying sequence.

参数:

bytes - byte sequence

copy

public final void copy(byte[] bytes,
        int offset,
        int length)

Copy the specified byte array to the Buffer. Replaces the current buffer.

参数:

bytes - byte array to be assigned

offset - offset into byte array

length - length of data

get

public byte[] get()

Get the data from the Buffer.

返回:

The data is only valid between 0 and getCount() - 1.

getCount

public int getCount()

Get the current count of the buffer.

getCapacity

public int getCapacity()

Get the capacity, which is the maximum count that could handled without resizing the backing storage.

返回:

The number of bytes

setCapacity

public void setCapacity(int newCapacity)

Change the capacity of the backing storage. The data is preserved if newCapacity >= getCount().

参数:

newCapacity - The new capacity in bytes.

reset

public void reset()

Reset the buffer to 0 size

truncate

public void truncate()

Change the capacity of the backing store to be the same as the current count of buffer.

append

public void append(byte[] bytes,
          int offset,
          int length)

Append specified bytes to the buffer.

参数:

bytes - byte array to be appended

offset - offset into byte array

length - length of data

append

public void append(byte[] bytes)

Append specified bytes to the buffer

参数:

bytes - byte array to be appended

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

compareTo

public int compareTo(Object other)

Define the sort order of the Buffer.

指定者:

compareTo 在接口中 Comparable

参数:

other - The other buffer

返回:

Positive if this is bigger than other, 0 if they are equal, and negative if this is smaller than other.

equals

public boolean equals(Object other)

覆盖:

equals 在类中 Object

toString

public String toString()

覆盖:

toString 在类中 Object

toString

public String toString(String charsetName)
                throws UnsupportedEncodingException

Convert the byte buffer to a string an specific character encoding

参数:

charsetName - Valid Java Character Set Name

抛出:

UnsupportedEncodingException

clone

public Object clone()
             throws CloneNotSupportedException

覆盖:

clone 在类中 Object

抛出:

CloneNotSupportedException