Package adams.data

Class AbstractAnonymizer<T>

java.lang.Object

adams.data.AbstractAnonymizer<T>

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

DoubleAnonymizer, IntegerAnonymizer, StringAnonymizer

public abstract class AbstractAnonymizer<T>
extends Object
implements Serializable

Allows anonymizing of values.

Version:

$Revision$

Author:

fracpete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected ArrayList<Integer>	m_Buffer	the buffer of unused random IDs.
protected int	m_BufferSize	the buffer size.
protected String	m_ID	the ID of the anonymizer (used for hashcode).
protected Hashtable<T,Integer>	m_Mapping	the current mapping (actual value <-> random).
protected Random	m_Random	for shuffling the IDs.
protected long	m_Seed	the seed value.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractAnonymizer()	Default constructor.
protected	AbstractAnonymizer(String id, int bufferSize)	Initializes the anonymizer with a random seed value.
protected	AbstractAnonymizer(String id, long seed, int bufferSize)	Initializes the anonymizer.

Method Summary

Modifier and Type	Method	Description
T	anonymize(T value)	Returns an anonymized value.
protected void	fillBuffer()	Fills up the buffer with random values again.
int	getBufferSize()	Returns the buffer size of this anonymizer.
String	getID()	Returns the ID of this anonymizer.
long	getSeed()	Returns the seed of this anonymizer.
int	hashCode()	Returns the hashcode for this anonymizer (based on its ID).
protected abstract T	toAnonymized(Integer id)	Turns the anonymous integer ID into the appropriate data type.
String	toString()	Returns a short description of the anonymizer.

Methods inherited from class java.lang.Object

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

Field Detail

m_ID

protected String m_ID

the ID of the anonymizer (used for hashcode).

m_Seed

protected long m_Seed

the seed value.

m_Random

protected Random m_Random

for shuffling the IDs.

m_BufferSize

protected int m_BufferSize

the buffer size.

m_Buffer

protected ArrayList<Integer> m_Buffer

the buffer of unused random IDs.

m_Mapping

protected Hashtable<T,Integer> m_Mapping

the current mapping (actual value <-> random).

Constructor Detail

AbstractAnonymizer

protected AbstractAnonymizer()

Default constructor. Uses a random ID and buffer size 100.

AbstractAnonymizer

protected AbstractAnonymizer(String id,
                             int bufferSize)

Initializes the anonymizer with a random seed value.

Parameters:

id - the ID of the anonymizer

bufferSize - the size of the buffer for unused IDs

AbstractAnonymizer

protected AbstractAnonymizer(String id,
                             long seed,
                             int bufferSize)

Initializes the anonymizer.

Parameters:

id - the ID of the anonymizer

seed - the seed value for the random number generator

bufferSize - the size of the buffer for unused IDs

Method Detail

getID

public String getID()

Returns the ID of this anonymizer.

Returns:

the ID

getSeed

public long getSeed()

Returns the seed of this anonymizer.

Returns:

the seed

getBufferSize

public int getBufferSize()

Returns the buffer size of this anonymizer.

Returns:

the buffer size

toAnonymized

protected abstract T toAnonymized(Integer id)

Turns the anonymous integer ID into the appropriate data type.

Parameters:

id - the ID to convert

Returns:

the final result

fillBuffer

protected void fillBuffer()

Fills up the buffer with random values again.

anonymize

public T anonymize(T value)

Returns an anonymized value.

Parameters:

value - the value to anonymize

Returns:

the anonymous value

hashCode

public int hashCode()

Returns the hashcode for this anonymizer (based on its ID).

Overrides:

hashCode in class Object

Returns:

the hashcode

toString

public String toString()

Returns a short description of the anonymizer.

Overrides:

toString in class Object

Returns:

the description