DataInputBuffer (Hadoop 0.20.2-cdh3u5 API)
Date: 2012-10-05

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## org.apache.hadoop.io
Class DataInputBuffer

    java.lang.Object
      java.io.InputStream
          java.io.FilterInputStream
              java.io.DataInputStream
                  org.apache.hadoop.io.DataInputBuffer

All Implemented Interfaces:
  Closeable, DataInput

    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 ...
     }

Field Summary

Fields inherited from class java.io.FilterInputStream
`in`

Constructor Summary
`DataInputBuffer()` Constructs a new empty buffer.

Method Summary
`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.

Methods inherited from class java.io.DataInputStream
`read, read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, readUTF, skipBytes`

Methods inherited from class java.io.FilterInputStream
`available, close, mark, markSupported, read, reset, skip`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DataInputBuffer

    public DataInputBuffer()

  Constructs a new empty buffer.

Method Detail

### 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.

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Copyright © 2009 The Apache Software Foundation