org.apache.commons.collections4.bag

Class PredicatedSortedBag<E>

java.lang.Object

org.apache.commons.collections4.collection.AbstractCollectionDecorator<E>

org.apache.commons.collections4.collection.PredicatedCollection<E>

org.apache.commons.collections4.bag.PredicatedBag<E>

org.apache.commons.collections4.bag.PredicatedSortedBag<E>

All Implemented Interfaces:

java.io.Serializable, java.lang.Iterable<E>, java.util.Collection<E>, Bag<E>, SortedBag<E>

public class PredicatedSortedBag<E>
extends PredicatedBag<E>
implements SortedBag<E>

Decorates another SortedBag to validate that additions match a specified predicate.

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

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

 SortedBag bag = PredicatedSortedBag.predicatedSortedBag(new TreeBag(), NotNullPredicate.INSTANCE);
 

This class is Serializable from Commons Collections 3.1.

Since:

3.0

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.collections4.collection.PredicatedCollection

PredicatedCollection.Builder<E>

Method Summary

Modifier and Type	Method and Description
java.util.Comparator<? super E>	comparator() Returns the comparator associated with this sorted set, or null if it uses its elements' natural ordering.
E	first() Returns the first (lowest) member.
E	last() Returns the last (highest) member.
static <E> PredicatedSortedBag<E>	predicatedSortedBag(SortedBag<E> bag, Predicate<? super E> predicate) Factory method to create a predicated (validating) bag.

Methods inherited from class org.apache.commons.collections4.bag.PredicatedBag

add, equals, getCount, hashCode, predicatedBag, remove, uniqueSet

Methods inherited from class org.apache.commons.collections4.collection.PredicatedCollection

add, addAll, builder, notNullBuilder, predicatedCollection

Methods inherited from class org.apache.commons.collections4.collection.AbstractCollectionDecorator

clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.commons.collections4.Bag

add, add, containsAll, getCount, iterator, remove, remove, removeAll, retainAll, size, uniqueSet

Methods inherited from interface java.util.Collection

addAll, clear, contains, equals, hashCode, isEmpty, parallelStream, removeIf, spliterator, stream, toArray, toArray

Methods inherited from interface java.lang.Iterable

forEach

Method Detail

predicatedSortedBag

public static <E> PredicatedSortedBag<E> predicatedSortedBag(SortedBag<E> bag,
                                                             Predicate<? super E> predicate)

Factory method to create a predicated (validating) bag.

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

Type Parameters:

E - the type of the elements in the bag

Parameters:

bag - the bag to decorate, must not be null

predicate - the predicate to use for validation, must not be null

Returns:

a new predicated SortedBag

Throws:

java.lang.NullPointerException - if bag or predicate is null

java.lang.IllegalArgumentException - if the bag contains invalid elements

Since:

4.0

first

public E first()

Description copied from interface: SortedBag

Returns the first (lowest) member.

Specified by:

first in interface SortedBag<E>

Returns:

the first element in the sorted bag

last

public E last()

Description copied from interface: SortedBag

Returns the last (highest) member.

Specified by:

last in interface SortedBag<E>

Returns:

the last element in the sorted bag

comparator

public java.util.Comparator<? super E> comparator()

Description copied from interface: SortedBag

Returns the comparator associated with this sorted set, or null if it uses its elements' natural ordering.

Specified by:

comparator in interface SortedBag<E>

Returns:

the comparator in use, or null if natural ordering