com.nhncorp.neptune.common.io
Class NDataOutputBuffer

java.lang.Object
  java.io.OutputStream
      java.io.FilterOutputStream
          java.io.DataOutputStream
              com.nhncorp.neptune.common.io.NDataOutputBuffer

All Implemented Interfaces:

java.io.Closeable, java.io.DataOutput, java.io.Flushable

public class NDataOutputBuffer
extends java.io.DataOutputStream

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

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

Typical usage is something like the following:

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

Author:

Doug Cutting

Constructor Summary

NDataOutputBuffer()
Constructs a new empty buffer.

Method Summary

byte[]	getData() Returns the current contents of the buffer.
int	getLength() Returns the length of the valid data currently in the buffer.
NDataOutputBuffer	reset() Resets the buffer to empty.
void	write(java.io.DataInput in, int length) Writes bytes from a DataInput directly into the buffer.

Methods inherited from class java.io.DataOutputStream

flush, size, write, write, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF

Methods inherited from class java.io.FilterOutputStream

close, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.io.DataOutput

write

Constructor Detail

NDataOutputBuffer

public NDataOutputBuffer()

Constructs a new empty buffer.

Method Detail

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 NDataOutputBuffer reset()

Resets the buffer to empty.

write

public void write(java.io.DataInput in,
                  int length)
           throws java.io.IOException

Writes bytes from a DataInput directly into the buffer.

Throws:

java.io.IOException