org.apache.hadoop.io

类 DataInputBuffer

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

java.io.DataInputStream

org.apache.hadoop.io.DataInputBuffer

所有已实现的接口:

Closeable, DataInput, AutoCloseable

public class DataInputBuffer
extends DataInputStream

A reusable DataInput implementation that reads from an in-memory buffer.

This saves memory over creating a new DataInputStream and ByteArrayInputStream each time data is read.

Typical usage is something like the following:

 DataInputBuffer buffer = new DataInputBuffer();
 while (... loop condition ...) {
   byte[] data = ... get data ...;
   int dataLength = ... get data length ...;
   buffer.reset(data, dataLength);
   ... read buffer using DataInput methods ...
 }
 

字段概要

从类继承的字段 java.io.FilterInputStream

in

构造器概要

构造器

构造器和说明
DataInputBuffer() Constructs a new empty buffer.

方法概要

方法

限定符和类型	方法和说明
byte[]	getData()
int	getLength() Returns the length of the input.
int	getPosition() Returns the current position in the input.
void	reset(byte[] input, int length) Resets the data that the buffer reads.
void	reset(byte[] input, int start, int length) Resets the data that the buffer reads.

从类继承的方法 java.io.DataInputStream

read, read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, readUTF, skipBytes

从类继承的方法 java.io.FilterInputStream

available, close, mark, markSupported, read, reset, skip

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

DataInputBuffer

public DataInputBuffer()

Constructs a new empty buffer.

方法详细资料

reset

public void reset(byte[] input,
         int length)

Resets the data that the buffer reads.

reset

public void reset(byte[] input,
         int start,
         int length)

Resets the data that the buffer reads.

getData

public byte[] getData()

getPosition

public int getPosition()

Returns the current position in the input.

getLength

public int getLength()

Returns the length of the input.