org.apache.commons.collections4.bag

Class UnmodifiableSortedBag<E>

java.lang.Object

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

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

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

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

Type Parameters:

E - the type of elements in this bag

All Implemented Interfaces:

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

public final class UnmodifiableSortedBag<E>
extends AbstractSortedBagDecorator<E>
implements Unmodifiable

Decorates another SortedBag to ensure it can't be altered.

This class is Serializable from Commons Collections 3.1.

Attempts to modify it will result in an UnsupportedOperationException.

Since:

3.0

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
boolean	add(E object) (Violation) Adds one copy of the specified object to the Bag.
boolean	add(E object, int count) Adds nCopies copies of the specified object to the Bag.
boolean	addAll(java.util.Collection<? extends E> coll)
void	clear()
java.util.Iterator<E>	iterator() Returns an Iterator over the entire set of members, including copies due to cardinality.
boolean	remove(java.lang.Object object) (Violation) Removes all occurrences of the given object from the bag.
boolean	remove(java.lang.Object object, int count) Removes nCopies copies of the specified object from the Bag.
boolean	removeAll(java.util.Collection<?> coll) (Violation) Remove all elements represented in the given collection, respecting cardinality.
boolean	retainAll(java.util.Collection<?> coll) (Violation) Remove any members of the bag that are not in the given collection, respecting cardinality.
java.util.Set<E>	uniqueSet() Returns a Set of unique elements in the Bag.
static <E> SortedBag<E>	unmodifiableSortedBag(SortedBag<E> bag) Factory method to create an unmodifiable bag.

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

comparator, first, last

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

equals, getCount, hashCode

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

contains, containsAll, isEmpty, 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

containsAll, getCount, size

Methods inherited from interface java.util.Collection

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

Methods inherited from interface java.lang.Iterable

forEach

Method Detail

unmodifiableSortedBag

public static <E> SortedBag<E> unmodifiableSortedBag(SortedBag<E> bag)

Factory method to create an unmodifiable bag.

If the bag passed in is already unmodifiable, it is returned.

Type Parameters:

E - the type of the elements in the bag

Parameters:

bag - the bag to decorate, must not be null

Returns:

an unmodifiable SortedBag

Throws:

java.lang.NullPointerException - if bag is null

Since:

4.0

iterator

public java.util.Iterator<E> iterator()

Description copied from interface: Bag

Returns an Iterator over the entire set of members, including copies due to cardinality. This iterator is fail-fast and will not tolerate concurrent modifications.

Specified by:

iterator in interface java.lang.Iterable<E>

Specified by:

iterator in interface java.util.Collection<E>

Specified by:

iterator in interface Bag<E>

Overrides:

iterator in class AbstractCollectionDecorator<E>

Returns:

iterator over all elements in the Bag

add

public boolean add(E object)

Description copied from interface: Bag

(Violation) Adds one copy of the specified object to the Bag.

If the object is already in the Bag.uniqueSet() then increment its count as reported by Bag.getCount(Object). Otherwise add it to the Bag.uniqueSet() and report its count as 1.

Since this method always increases the size of the bag, according to the Collection.add(Object) contract, it should always return true. Since it sometimes returns false, this method violates the contract.

Specified by:

add in interface java.util.Collection<E>

Specified by:

add in interface Bag<E>

Overrides:

add in class AbstractCollectionDecorator<E>

Parameters:

object - the object to add

Returns:

true if the object was not already in the uniqueSet

addAll

public boolean addAll(java.util.Collection<? extends E> coll)

Specified by:

addAll in interface java.util.Collection<E>

Overrides:

addAll in class AbstractCollectionDecorator<E>

clear

public void clear()

Specified by:

clear in interface java.util.Collection<E>

Overrides:

clear in class AbstractCollectionDecorator<E>

remove

public boolean remove(java.lang.Object object)

Description copied from interface: Bag

(Violation) Removes all occurrences of the given object from the bag.

This will also remove the object from the Bag.uniqueSet().

According to the Collection.remove(Object) method, this method should only remove the first occurrence of the given object, not all occurrences.

Specified by:

remove in interface java.util.Collection<E>

Specified by:

remove in interface Bag<E>

Overrides:

remove in class AbstractCollectionDecorator<E>

Parameters:

object - the object to remove

Returns:

true if this call changed the collection

removeAll

public boolean removeAll(java.util.Collection<?> coll)

Description copied from interface: Bag

(Violation) Remove all elements represented in the given collection, respecting cardinality. That is, if the given collection coll contains n copies of a given object, the bag will have n fewer copies, assuming the bag had at least n copies to begin with.

The Collection.removeAll(Collection) method specifies that cardinality should not be respected; this method should remove all occurrences of every object contained in the given collection.

Specified by:

removeAll in interface java.util.Collection<E>

Specified by:

removeAll in interface Bag<E>

Overrides:

removeAll in class AbstractCollectionDecorator<E>

Parameters:

coll - the collection to remove

Returns:

true if this call changed the collection

retainAll

public boolean retainAll(java.util.Collection<?> coll)

Description copied from interface: Bag

(Violation) Remove any members of the bag that are not in the given collection, respecting cardinality. That is, if the given collection coll contains n copies of a given object and the bag has m > n copies, then delete m - n copies from the bag. In addition, if e is an object in the bag but !coll.contains(e), then remove e and any of its copies.

The Collection.retainAll(Collection) method specifies that cardinality should not be respected; this method should keep all occurrences of every object contained in the given collection.

Specified by:

retainAll in interface java.util.Collection<E>

Specified by:

retainAll in interface Bag<E>

Overrides:

retainAll in class AbstractCollectionDecorator<E>

Parameters:

coll - the collection to retain

Returns:

true if this call changed the collection

add

public boolean add(E object,
                   int count)

Description copied from interface: Bag

Adds nCopies copies of the specified object to the Bag.

If the object is already in the Bag.uniqueSet() then increment its count as reported by Bag.getCount(Object). Otherwise add it to the Bag.uniqueSet() and report its count as nCopies.

Specified by:

add in interface Bag<E>

Overrides:

add in class AbstractBagDecorator<E>

Parameters:

object - the object to add

count - the number of copies to add

Returns:

true if the object was not already in the uniqueSet

remove

public boolean remove(java.lang.Object object,
                      int count)

Description copied from interface: Bag

Removes nCopies copies of the specified object from the Bag.

If the number of copies to remove is greater than the actual number of copies in the Bag, no error is thrown.

Specified by:

remove in interface Bag<E>

Overrides:

remove in class AbstractBagDecorator<E>

Parameters:

object - the object to remove

count - the number of copies to remove

Returns:

true if this call changed the collection

uniqueSet

public java.util.Set<E> uniqueSet()

Description copied from interface: Bag

Returns a Set of unique elements in the Bag.

Uniqueness constraints are the same as those in Set.

Specified by:

uniqueSet in interface Bag<E>

Overrides:

uniqueSet in class AbstractBagDecorator<E>

Returns:

the Set of unique Bag elements