Package org.apache.commons.collections4.set

Class PredicatedSortedSet<E>

java.lang.Object
org.apache.commons.collections4.collection.AbstractCollectionDecorator<E>
org.apache.commons.collections4.collection.PredicatedCollection<E>
org.apache.commons.collections4.set.PredicatedSet<E>
org.apache.commons.collections4.set.PredicatedSortedSet<E>
Type Parameters:
E - the type of the elements in this set
All Implemented Interfaces:
Serializable, Iterable<E>, Collection<E>, SequencedCollection<E>, SequencedSet<E>, Set<E>, SortedSet<E>
Direct Known Subclasses:
PredicatedNavigableSet
public class PredicatedSortedSet<E> extends PredicatedSet<E> implements SortedSet<E>
Decorates another SortedSet to validate that all additions match a specified predicate.

This set exists to provide validation for the decorated set. It is normally created to decorate an empty set. If an object cannot be added to the set, an IllegalArgumentException is thrown.

One usage would be to ensure that no null entries are added to the set. 

 SortedSet set =
   PredicatedSortedSet.predicatedSortedSet(new TreeSet(),
                                           NotNullPredicate.notNullPredicate());

This class is Serializable from Commons Collections 3.1.

Since:
3.0
See Also:

  • Method Details

    • predicatedSortedSet

      public static <E> PredicatedSortedSet<E> predicatedSortedSet(SortedSet<E> set, Predicate<? super E> predicate)
      Factory method to create a predicated (validating) sorted set.

      If there are any elements already in the set being decorated, they are validated.

      Type Parameters:
      E - the element type
      Parameters:
      set - the set to decorate, must not be null
      predicate - the predicate to use for validation, must not be null
      Returns:
      a new predicated sorted set.
      Throws:
      NullPointerException - if set or predicate is null
      IllegalArgumentException - if the set contains invalid elements
      Since:
      4.0

    • comparator

      public Comparator<? super E> comparator()
      Specified by:
      comparator in interface SortedSet<E>

    • first

      public E first()
      Specified by:
      first in interface SortedSet<E>

    • last

      public E last()
      Specified by:
      last in interface SortedSet<E>

    • subSet

      public SortedSet<E> subSet(E fromElement, E toElement)
      Specified by:
      subSet in interface SortedSet<E>

    • headSet

      public SortedSet<E> headSet(E toElement)
      Specified by:
      headSet in interface SortedSet<E>

    • tailSet

      public SortedSet<E> tailSet(E fromElement)
      Specified by:
      tailSet in interface SortedSet<E>