Package weka.associations

Class Item

java.lang.Object
weka.associations.Item
All Implemented Interfaces:
Serializable, Comparable<Item>
Direct Known Subclasses:
NominalItem, NumericItem
public abstract class Item extends Object implements Serializable, 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: 8034 $
Author:
Mark Hall (mhall{[at]}pentaho{[dot]}com).
See Also:

  • Constructor Details

  • Method Details

    • 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 String getItemValueAsString()
      Get this item's value as a String.
      Returns:
      this item's value as a String.

    • getComparisonAsString

      public abstract String getComparisonAsString()
      Get this item's comparison operator as a String.
      Returns:
      this item's comparison operator as a String.

    • toString

      public String toString()
      A string representation of this item. (i.e. ).
      Overrides:
      toString in class Object
      Returns:
      a string representation of this item.

    • toString

      public 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 Comparable<Item>
      Parameters:
      comp - the Item to compare against.

    • equals

      public boolean equals(Object compareTo)
      Equals. Just compares attribute.
      Overrides:
      equals in class Object
      Returns:
      true if this Item is equal to the argument.

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object