eu.stratosphere.example.java.record.sort.terasort

Class TeraKey

java.lang.Object

eu.stratosphere.example.java.record.sort.terasort.TeraKey

All Implemented Interfaces:

IOReadableWritable, Key, Value, Serializable, Comparable<Key>

public final class TeraKey
extends Object
implements Key

An integer number according to the rules of Jim Gray's sorting benchmark has a length of 100 bytes. The first 10 bytes represent the key for the sort process, the rest is the value. The final byte of a 100 byte integer is always the newline character.

This class is a wrapper for the key part of the integer number.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	KEY_SIZE The size of the key in bytes.

Constructor Summary

Constructors

Constructor and Description
TeraKey() Default constructor required for serialization/deserialization.
TeraKey(byte[] srcBuf, int offset) Constructs a new key object.

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(Key arg0)
void	copyToBuffer(byte[] buf) Copies the key to the given byte buffer.
boolean	equals(Object obj)
int	hashCode()
void	read(DataInput in)
void	setValue(byte[] data, int offset) Sets the value of this key object.
String	toString()
void	write(DataOutput out)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

KEY_SIZE

public static final int KEY_SIZE

The size of the key in bytes.

See Also:

Constant Field Values

Constructor Detail

TeraKey

public TeraKey(byte[] srcBuf,
       int offset)

Constructs a new key object. The key points to the subsequence in the given array, i.e. it is sharing the byte array.

Parameters:

srcBuf - The source buffer to read the key from.

offset - The offset in the byte array where the key subsequence starts.

TeraKey

public TeraKey()

Default constructor required for serialization/deserialization.

Method Detail

setValue

public void setValue(byte[] data,
            int offset)

Sets the value of this key object. This key will point to the subsequence in the given array, i.e. it is sharing the byte array.

Parameters:

data - The source buffer to read the key from.

offset - The offset in the byte array where the key subsequence starts.

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface IOReadableWritable

Throws:

IOException

read

public void read(DataInput in)
          throws IOException

Specified by:

read in interface IOReadableWritable

Throws:

IOException

compareTo

public int compareTo(Key arg0)

Specified by:

compareTo in interface Comparable<Key>

hashCode

public int hashCode()

Specified by:

hashCode in interface Key

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Specified by:

equals in interface Key

Overrides:

equals in class Object

copyToBuffer

public void copyToBuffer(byte[] buf)

Copies the key to the given byte buffer.

Parameters:

buf - the buffer to copy the key to

toString

public String toString()

Overrides:

toString in class Object