org.apache.hadoop.hbase.util

Class Writables

java.lang.Object

org.apache.hadoop.hbase.util.Writables

@InterfaceAudience.Private
public class Writables
extends Object

Utility class with methods for manipulating Writable objects

Constructor Summary

Constructors

Constructor and Description
Writables()

Method Summary

Modifier and Type	Method and Description
static org.apache.hadoop.io.Writable	copyWritable(byte[] bytes, org.apache.hadoop.io.Writable tgt) Copy one Writable to another.
static org.apache.hadoop.io.Writable	copyWritable(org.apache.hadoop.io.Writable src, org.apache.hadoop.io.Writable tgt) Copy one Writable to another.
static byte[]	getBytes(org.apache.hadoop.io.Writable... ws) Put a bunch of Writables as bytes all into the one byte array.
static byte[]	getBytes(org.apache.hadoop.io.Writable w)
static org.apache.hadoop.io.Writable	getWritable(byte[] bytes, int offset, int length, org.apache.hadoop.io.Writable w) Set bytes into the passed Writable by calling its Writable.readFields(java.io.DataInput).
static org.apache.hadoop.io.Writable	getWritable(byte[] bytes, org.apache.hadoop.io.Writable w) Set bytes into the passed Writable by calling its Writable.readFields(java.io.DataInput).

Methods inherited from class java.lang.Object

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

Constructor Detail

Writables

public Writables()

Method Detail

getBytes

public static byte[] getBytes(org.apache.hadoop.io.Writable w)
                       throws IOException

Parameters:

w - writable

Returns:

The bytes of w gotten by running its Writable.write(java.io.DataOutput) method.

Throws:

IOException - e

See Also:

getWritable(byte[], Writable)

getBytes

public static byte[] getBytes(org.apache.hadoop.io.Writable... ws)
                       throws IOException

Put a bunch of Writables as bytes all into the one byte array.

Parameters:

ws - writable

Returns:

The bytes of w gotten by running its Writable.write(java.io.DataOutput) method.

Throws:

IOException - e

getWritable

public static org.apache.hadoop.io.Writable getWritable(byte[] bytes,
                                                        org.apache.hadoop.io.Writable w)
                                                 throws IOException

Set bytes into the passed Writable by calling its Writable.readFields(java.io.DataInput).

Parameters:

bytes - serialized bytes

w - An empty Writable (usually made by calling the null-arg constructor).

Returns:

The passed Writable after its readFields has been called fed by the passed bytes array or IllegalArgumentException if passed null or an empty bytes array.

Throws:

IOException - e

IllegalArgumentException

getWritable

public static org.apache.hadoop.io.Writable getWritable(byte[] bytes,
                                                        int offset,
                                                        int length,
                                                        org.apache.hadoop.io.Writable w)
                                                 throws IOException

Set bytes into the passed Writable by calling its Writable.readFields(java.io.DataInput).

Parameters:

bytes - serialized bytes

offset - offset into array

length - length of data

w - An empty Writable (usually made by calling the null-arg constructor).

Returns:

The passed Writable after its readFields has been called fed by the passed bytes array or IllegalArgumentException if passed null or an empty bytes array.

Throws:

IOException - e

IllegalArgumentException

copyWritable

public static org.apache.hadoop.io.Writable copyWritable(org.apache.hadoop.io.Writable src,
                                                         org.apache.hadoop.io.Writable tgt)
                                                  throws IOException

Copy one Writable to another. Copies bytes using data streams.

Parameters:

src - Source Writable

tgt - Target Writable

Returns:

The target Writable.

Throws:

IOException - e

copyWritable

public static org.apache.hadoop.io.Writable copyWritable(byte[] bytes,
                                                         org.apache.hadoop.io.Writable tgt)
                                                  throws IOException

Copy one Writable to another. Copies bytes using data streams.

Parameters:

bytes - Source Writable

tgt - Target Writable

Returns:

The target Writable.

Throws:

IOException - e