weka.associations
Class Item

java.lang.Object
  weka.associations.Item

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<Item>

Direct Known Subclasses:

NominalItem, NumericItem

public abstract class Item
extends java.lang.Object
implements java.io.Serializable, java.lang.Comparable<Item>

Class that encapsulates information about an individual item. An item is a value of a nominal attribute, so this class has a backing Attribute.

Version:

$Revision: 6543 $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com).

See Also:

Serialized Form

Constructor Summary

Item(Attribute att)

Method Summary

int	compareTo(Item comp) Ensures that items will be sorted in descending order of frequency.
void	decreaseFrequency() Decrement the frequency of this item.
void	decreaseFrequency(int f) Decrease the frequency of this item.
boolean	equals(java.lang.Object compareTo) Equals.
Attribute	getAttribute() Get the attribute that this item originates from.
abstract java.lang.String	getComparisonAsString() Get this item's comparison operator as a String.
int	getFrequency() Get the frequency of this item.
abstract java.lang.String	getItemValueAsString() Get this item's value as a String.
int	hashCode()
void	increaseFrequency() Increment the frequency of this item.
void	increaseFrequency(int f) Increase the frequency of this item.
java.lang.String	toString() A string representation of this item.
java.lang.String	toString(boolean freq) A string representation of this item, (i.e.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Item

public Item(Attribute att)

Method Detail

increaseFrequency

public void increaseFrequency(int f)

Increase the frequency of this item.

Parameters:

f - the amount to increase the frequency by.

decreaseFrequency

public void decreaseFrequency(int f)

Decrease the frequency of this item.

Parameters:

f - the amount by which to decrease the frequency.

increaseFrequency

public void increaseFrequency()

Increment the frequency of this item.

decreaseFrequency

public void decreaseFrequency()

Decrement the frequency of this item.

getFrequency

public int getFrequency()

Get the frequency of this item.

Returns:

the frequency.

getAttribute

public Attribute getAttribute()

Get the attribute that this item originates from.

Returns:

the corresponding attribute.

getItemValueAsString

public abstract java.lang.String getItemValueAsString()

Get this item's value as a String.

Returns:

this item's value as a String.

getComparisonAsString

public abstract java.lang.String getComparisonAsString()

Get this item's comparison operator as a String.

Returns:

this item's comparison operator as a String.

toString

public java.lang.String toString()

A string representation of this item. (i.e. ).

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this item.

toString

public java.lang.String toString(boolean freq)

A string representation of this item, (i.e. ). This default implementation just prints the attribute name and (optionally) frequency information.

Parameters:

freq - true if the frequency should be included.

Returns:

a string representation of this item.

compareTo

public int compareTo(Item comp)

Ensures that items will be sorted in descending order of frequency. Ties are ordered by attribute name.

Specified by:

compareTo in interface java.lang.Comparable<Item>

Parameters:

comp - the Item to compare against.

equals

public boolean equals(java.lang.Object compareTo)

Equals. Just compares attribute.

Overrides:

equals in class java.lang.Object

Returns:

true if this Item is equal to the argument.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object