Class SetUtils.SetView<E>

java.lang.Object
java.util.AbstractCollection<E>
java.util.AbstractSet<E>
org.apache.commons.collections4.SetUtils.SetView<E>
Type Parameters:
E - the element type
All Implemented Interfaces:
Iterable<E>, Collection<E>, Set<E>
Enclosing class:
SetUtils
public abstract static class SetUtils.SetView<E> extends AbstractSet<E>
An unmodifiable view of a set that may be backed by other sets.

If the decorated sets change, this view will change as well. The contents of this view can be transferred to another instance via the copyInto(Set) and toSet() methods.

Since:
4.1

  • Constructor Details

    • SetView

      public SetView()
      Constructs a new instance.

  • Method Details

    • copyInto

      public <S extends Set<E>> void copyInto(S set)
      Copies the contents of this view into the provided set.
      Type Parameters:
      S - the set type
      Parameters:
      set - the set for copying the contents

    • createIterator

      protected abstract Iterator<E> createIterator()
      Return an iterator for this view; the returned iterator is not required to be unmodifiable.
      Returns:
      a new iterator for this view

    • iterator

      public Iterator<E> iterator()
      Specified by:
      iterator in interface Collection<E>
      Specified by:
      iterator in interface Iterable<E>
      Specified by:
      iterator in interface Set<E>
      Specified by:
      iterator in class AbstractCollection<E>

    • size

      public int size()
      Specified by:
      size in interface Collection<E>
      Specified by:
      size in interface Set<E>
      Specified by:
      size in class AbstractCollection<E>

    • toSet

      public Set<E> toSet()
      Returns a new set containing the contents of this view.
      Returns:
      a new set containing all elements of this view