Package de.uni_kl.cs.discodnc.misc

Class SetUtils

java.lang.Object

de.uni_kl.cs.discodnc.misc.SetUtils

public class SetUtils
extends java.lang.Object

A tiny collection of convenience methods useful in dealing with sets but not provided directly by Java's set classes.

Constructor Summary

Constructors

Constructor	Description
SetUtils()

Method Summary

Modifier and Type	Method	Description
static <T> java.util.Set<T>	getDifference(java.util.Set<T> s1, java.util.Set<T> s2)	Returns the set difference between the set s1 and the set s2.
static <T> java.util.Set<T>	getIntersection(java.util.List<java.util.Set<T>> sets)	Returns the intersection of all sets contained in the list sets.
static <T> java.util.Set<T>	getIntersection(java.util.Set<T> s1, java.util.Set<T> s2)	Returns the intersection of set s1 and set s2.
static <T> java.util.Set<T>	getUnion(java.util.List<java.util.Set<T>> sets)	Returns the union of all sets contained in the list sets.
static <T> java.util.Set<T>	getUnion(java.util.Set<T> s1, java.util.Set<T> s2)	Returns the union of set s1 and set s2.

Methods inherited from class java.lang.Object

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

Constructor Detail

SetUtils

public SetUtils()

Method Detail

getDifference

public static <T> java.util.Set<T> getDifference(java.util.Set<T> s1,
                                                 java.util.Set<T> s2)

Returns the set difference between the set s1 and the set s2.

Type Parameters:

T - Type of the sets' entries.

Parameters:

s1 - A set.

s2 - Another set.

Returns:

The difference set.

getIntersection

public static <T> java.util.Set<T> getIntersection(java.util.Set<T> s1,
                                                   java.util.Set<T> s2)

Returns the intersection of set s1 and set s2. Returns an empty set if the intersection is empty, i.e., does not return null.

Type Parameters:

T - Type of the sets' entries.

Parameters:

s1 - A set.

s2 - Another set.

Returns:

The intersection set.

getIntersection

public static <T> java.util.Set<T> getIntersection(java.util.List<java.util.Set<T>> sets)

Returns the intersection of all sets contained in the list sets.

Type Parameters:

T - Type of the sets' entries.

Parameters:

sets - A list of sets

Returns:

The intersection of all sets

getUnion

public static <T> java.util.Set<T> getUnion(java.util.Set<T> s1,
                                            java.util.Set<T> s2)

Returns the union of set s1 and set s2.

Type Parameters:

T - Type of the sets' entries.

Parameters:

s1 - A set.

s2 - Another set.

Returns:

The union set.

getUnion

public static <T> java.util.Set<T> getUnion(java.util.List<java.util.Set<T>> sets)

Returns the union of all sets contained in the list sets.

Type Parameters:

T - Type of the sets' entries.

Parameters:

sets - A list of sets.

Returns:

The union of all sets.