Package org.apache.hadoop.util.bloom

Class Key

java.lang.Object

org.apache.hadoop.util.bloom.Key

All Implemented Interfaces:

java.lang.Comparable<Key>, Writable, WritableComparable<Key>

@LimitedPrivate({"HDFS","MapReduce"})
@Unstable
public class Key
extends java.lang.Object
implements WritableComparable<Key>

The general behavior of a key that must be stored in a filter.

See Also:

The general behavior of a filter

Constructor Summary

Constructors

Constructor	Description
Key()	default constructor - use with readFields
Key(byte[] value)	Constructor.
Key(byte[] value, double weight)	Constructor.

Method Summary

Modifier and Type	Method	Description
int	compareTo(Key other)
boolean	equals(java.lang.Object o)
byte[]	getBytes()
double	getWeight()
int	hashCode()
void	incrementWeight()	Increments the weight of this key by one.
void	incrementWeight(double weight)	Increments the weight of this key with a specified value.
void	readFields(java.io.DataInput in)	Deserialize the fields of this object from in.
void	set(byte[] value, double weight)
void	write(java.io.DataOutput out)	Serialize the fields of this object to out.

Methods inherited from class java.lang.Object

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

Constructor Detail

Key

public Key()

default constructor - use with readFields

Key

public Key(byte[] value)

Constructor.

Builds a key with a default weight.

Parameters:

value - The byte value of this key.

Key

public Key(byte[] value,
           double weight)

Constructor.

Builds a key with a specified weight.

Parameters:

value - The value of this key.

weight - The weight associated to this key.

Method Detail

set

public void set(byte[] value,
                double weight)

Parameters:

value - value.

weight - weight.

getBytes

public byte[] getBytes()

Returns:

byte[] The value of this key.

getWeight

public double getWeight()

Returns:

Returns the weight associated to this key.

incrementWeight

public void incrementWeight(double weight)

Increments the weight of this key with a specified value.

Parameters:

weight - The increment.

incrementWeight

public void incrementWeight()

Increments the weight of this key by one.

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

write

public void write(java.io.DataOutput out)
           throws java.io.IOException

Description copied from interface: Writable

Serialize the fields of this object to out.

Specified by:

write in interface Writable

Parameters:

out - DataOuput to serialize this object into.

Throws:

java.io.IOException - any other problem for write.

readFields

public void readFields(java.io.DataInput in)
                throws java.io.IOException

Description copied from interface: Writable

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

Specified by:

readFields in interface Writable

Parameters:

in - DataInput to deseriablize this object from.

Throws:

java.io.IOException - any other problem for readFields.

compareTo

public int compareTo(Key other)

Specified by:

compareTo in interface java.lang.Comparable<Key>