org.apache.hadoop.io

类 OutputBuffer

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

org.apache.hadoop.io.OutputBuffer

所有已实现的接口:

Closeable, Flushable, AutoCloseable

public class OutputBuffer
extends FilterOutputStream

A reusable OutputStream implementation that writes to an in-memory buffer.

This saves memory over creating a new OutputStream and ByteArrayOutputStream each time data is written.

Typical usage is something like the following:

 OutputBuffer buffer = new OutputBuffer();
 while (... loop condition ...) {
   buffer.reset();
   ... write buffer using OutputStream methods ...
   byte[] data = buffer.getData();
   int dataLength = buffer.getLength();
   ... write data to its ultimate destination ...
 }
 

另请参阅:

DataOutputBuffer, InputBuffer

字段概要

从类继承的字段 java.io.FilterOutputStream

out

构造器概要

构造器

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

方法概要

方法

限定符和类型	方法和说明
byte[]	getData() Returns the current contents of the buffer.
int	getLength() Returns the length of the valid data currently in the buffer.
OutputBuffer	reset() Resets the buffer to empty.
void	write(InputStream in, int length) Writes bytes from a InputStream directly into the buffer.

从类继承的方法 java.io.FilterOutputStream

close, flush, write, write, write

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

OutputBuffer

public OutputBuffer()

Constructs a new empty buffer.

方法详细资料

getData

public byte[] getData()

Returns the current contents of the buffer. Data is only valid to getLength().

getLength

public int getLength()

Returns the length of the valid data currently in the buffer.

reset

public OutputBuffer reset()

Resets the buffer to empty.

write

public void write(InputStream in,
         int length)
           throws IOException

Writes bytes from a InputStream directly into the buffer.

抛出:

IOException