org.apache.hadoop.hbase.util
Class Writables

java.lang.Object
  org.apache.hadoop.hbase.util.Writables

public class Writables
extends Object

Utility class with methods for manipulating Writable objects

Constructor Summary

Writables()

Method Summary

static long	bytesToLong(byte[] bytes) Converts a byte array to a long value
static String	bytesToString(byte[] bytes) Converts a byte array to a string in a consistent manner.
static Writable	copyWritable(Writable src, Writable tgt) Copy one Writable to another.
static byte[]	getBytes(Writable w)
static HRegionInfo	getHRegionInfo(byte[] bytes)
static HRegionInfo	getHRegionInfoOrNull(byte[] bytes)
static Writable	getWritable(byte[] bytes, Writable w) Set bytes into the passed Writable by calling its Writable.readFields(java.io.DataInput).
static byte[]	longToBytes(long val) Convert a long value to a byte array
static byte[]	stringToBytes(String s) Converts a string to a byte array in a consistent manner.

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(Writable w)
                       throws IOException

Parameters:

w -

Returns:

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

Throws:

IOException

See Also:

getWritable(byte[], Writable)

getWritable

public static Writable getWritable(byte[] bytes,
                                   Writable w)
                            throws IOException

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

Parameters:

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

IllegalArgumentException

getHRegionInfo

public static HRegionInfo getHRegionInfo(byte[] bytes)
                                  throws IOException

Parameters:

bytes -

Returns:

A HRegionInfo instance built out of passed bytes.

Throws:

IOException

getHRegionInfoOrNull

public static HRegionInfo getHRegionInfoOrNull(byte[] bytes)
                                        throws IOException

Parameters:

bytes -

Returns:

A HRegionInfo instance built out of passed bytes or null if passed bytes are null or an empty array.

Throws:

IOException

copyWritable

public static Writable copyWritable(Writable src,
                                    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

longToBytes

public static byte[] longToBytes(long val)
                          throws IOException

Convert a long value to a byte array

Parameters:

val -

Returns:

the byte array

Throws:

IOException

bytesToLong

public static long bytesToLong(byte[] bytes)
                        throws IOException

Converts a byte array to a long value

Parameters:

bytes -

Returns:

the long value

Throws:

IOException

stringToBytes

public static byte[] stringToBytes(String s)
                            throws UnsupportedEncodingException

Converts a string to a byte array in a consistent manner.

Parameters:

s -

Returns:

the byte array

Throws:

UnsupportedEncodingException

bytesToString

public static String bytesToString(byte[] bytes)
                            throws UnsupportedEncodingException

Converts a byte array to a string in a consistent manner.

Parameters:

bytes -

Returns:

the string

Throws:

UnsupportedEncodingException