Package org.tweetyproject.preferences.ranking

Class Functions<T>

java.lang.Object

java.util.AbstractMap<T,Integer>

java.util.HashMap<T,Integer>

org.tweetyproject.preferences.ranking.Functions<T>

Type Parameters:

T - generic preference order type

All Implemented Interfaces:

Serializable, Cloneable, Map<T,Integer>

Direct Known Subclasses:

LevelingFunction, RankingFunction

public abstract class Functions<T>
extends HashMap<T,Integer>

An abstract class as superclass for two different ranking/leveling functions used to rank elements from preference orders

Author:

Bastian Wolf

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor	Description
Functions()	Default Constructor

Method Summary

Modifier and Type	Method	Description
boolean	containsKey(Object key)	checks whether the key is present in the entry-set of the map
boolean	containsValue(Object value)	checks whether the value is present in the entry-set of the map
abstract PreferenceOrder<T>	generatePreferenceOrder()	this method returns a preference order made out of an ranking function
Integer	get(Object key)	returns the value to a given key
Set<Map.Entry<T,Integer>>	getElementsByValue(int val)	returns an entry set of all elements in this ranking function with the same rank (= value)
Map<T,Integer>	getLevelingFunction()	returns the ranking function
Set<Map.Entry<T,Integer>>	getPredecessors(Map.Entry<T,Integer> element)	returns a set of predecessor elements for the given entry
Set<Map.Entry<T,Integer>>	getSuccessors(Map.Entry<T,Integer> element)	returns a set of successor elements for the given entry
abstract void	strengthenElement(T element)	strengthens the given element in the function
String	toString()	returns a string representation for this ranking function
Collection<Integer>	values()	returns a collection containing all values of the map
abstract void	weakenElement(T element)	weakens the given element in the function

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, entrySet, forEach, getOrDefault, isEmpty, keySet, merge, newHashMap, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size

Methods inherited from class java.util.AbstractMap

equals, hashCode

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Details

Functions

public Functions()

Default Constructor

Method Details

toString

public String toString()

returns a string representation for this ranking function

Overrides:

toString in class AbstractMap<T,Integer>

getLevelingFunction

public Map<T,Integer> getLevelingFunction()

returns the ranking function

Returns:

ranking function

generatePreferenceOrder

public abstract PreferenceOrder<T> generatePreferenceOrder()

this method returns a preference order made out of an ranking function

Returns:

a preference order out of a given ranking function

containsKey

public boolean containsKey(Object key)

checks whether the key is present in the entry-set of the map

Specified by:

containsKey in interface Map<T,Integer>

Overrides:

containsKey in class HashMap<T,Integer>

containsValue

public boolean containsValue(Object value)

checks whether the value is present in the entry-set of the map

Specified by:

containsValue in interface Map<T,Integer>

Overrides:

containsValue in class HashMap<T,Integer>

get

public Integer get(Object key)

returns the value to a given key

Specified by:

get in interface Map<T,Integer>

Overrides:

get in class HashMap<T,Integer>

Returns:

the value if present, null otherwise (but value.equals(null) is possible)

values

public Collection<Integer> values()

returns a collection containing all values of the map

Specified by:

values in interface Map<T,Integer>

Overrides:

values in class HashMap<T,Integer>

getElementsByValue

public Set<Map.Entry<T,Integer>> getElementsByValue(int val)

returns an entry set of all elements in this ranking function with the same rank (= value)

Parameters:

val - the rank of the elements searched

Returns:

an entry set of all elements in this ranking function with the same rank (= value)

getPredecessors

public Set<Map.Entry<T,Integer>> getPredecessors(Map.Entry<T,Integer> element)

returns a set of predecessor elements for the given entry

Parameters:

element - the given entry

Returns:

a set of predecessor elements for the given entry

getSuccessors

public Set<Map.Entry<T,Integer>> getSuccessors(Map.Entry<T,Integer> element)

returns a set of successor elements for the given entry

Parameters:

element - the given entry

Returns:

a set of successor elements for the given entry

weakenElement

public abstract void weakenElement(T element)

weakens the given element in the function

Parameters:

element - the element being weakened

strengthenElement

public abstract void strengthenElement(T element)

strengthens the given element in the function

Parameters:

element - the element being strengthened