Package org.apache.commons.collections

Class DefaultMapBag

java.lang.Object

org.apache.commons.collections.DefaultMapBag

All Implemented Interfaces:

java.lang.Iterable, java.util.Collection, Bag

Direct Known Subclasses:

HashBag, TreeBag

@Deprecated(since="2021-04-30")
public abstract class DefaultMapBag
extends java.lang.Object
implements Bag

Deprecated.

Moved to bag subpackage as AbstractMapBag. Due to be removed in v4.0.

A skeletal implementation of the Bag interface to minimize the effort required for target implementations. Subclasses need only to call setMap(Map) in their constructor (or invoke the Map constructor) specifying a map instance that will be used to store the contents of the bag.

The map will be used to map bag elements to a number; the number represents the number of occurrences of that element in the bag.

Since:

Commons Collections 2.0

Constructor Summary

Constructors

Constructor	Description
DefaultMapBag()	Deprecated. No-argument constructor.

Method Summary

Modifier and Type	Method	Description
boolean	add(java.lang.Object object)	Deprecated. Adds a new element to the bag by incrementing its count in the underlying map.
boolean	add(java.lang.Object object, int nCopies)	Deprecated. Adds a new element to the bag by incrementing its count in the map.
boolean	addAll(java.util.Collection coll)	Deprecated. Invokes add(Object) for each element in the given collection.
void	clear()	Deprecated. Clears the bag by clearing the underlying map.
boolean	contains(java.lang.Object object)	Deprecated. Determines if the bag contains the given element by checking if the underlying map contains the element as a key.
boolean	containsAll(java.util.Collection coll)	Deprecated. Determines if the bag contains the given elements.
boolean	containsAll(Bag other)	Deprecated. Returns true if the bag contains all elements in the given collection, respecting cardinality.
boolean	equals(java.lang.Object object)	Deprecated. Returns true if the given object is not null, has the precise type of this bag, and contains the same number of occurrences of all the same elements.
int	getCount(java.lang.Object object)	Deprecated. Returns the number of occurrence of the given element in this bag by looking up its count in the underlying map.
int	hashCode()	Deprecated. Returns the hash code of the underlying map.
boolean	isEmpty()	Deprecated. Returns true if the underlying map is empty.
java.util.Iterator	iterator()	Deprecated. Returns an Iterator over the entire set of members, including copies due to cardinality.
boolean	remove(java.lang.Object object)	Deprecated. (Violation) Removes all occurrences of the given object from the bag.
boolean	remove(java.lang.Object object, int nCopies)	Deprecated. Removes nCopies copies of the specified object from the Bag.
boolean	removeAll(java.util.Collection coll)	Deprecated. (Violation) Remove all elements represented in the given collection, respecting cardinality.
boolean	retainAll(java.util.Collection coll)	Deprecated. Remove any members of the bag that are not in the given bag, respecting cardinality.
boolean	retainAll(Bag other)	Deprecated. Remove any members of the bag that are not in the given bag, respecting cardinality.
int	size()	Deprecated. Returns the number of elements in this bag.
java.lang.Object[]	toArray()	Deprecated. Returns an array of all of this bag's elements.
java.lang.Object[]	toArray(java.lang.Object[] array)	Deprecated. Returns an array of all of this bag's elements.
java.lang.String	toString()	Deprecated. Implement a toString() method suitable for debugging.
java.util.Set	uniqueSet()	Deprecated. Returns an unmodifiable view of the underlying map's key set.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, spliterator, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

DefaultMapBag

public DefaultMapBag()

Deprecated.

No-argument constructor. Subclasses should invoke setMap(Map) in their constructors.

Method Detail

add

public boolean add(java.lang.Object object)

Deprecated.

Adds a new element to the bag by incrementing its count in the underlying map.

Specified by:

add in interface Bag

Specified by:

add in interface java.util.Collection

Parameters:

object - the object to add

Returns:

true if the object was not already in the uniqueSet

add

public boolean add(java.lang.Object object,
                   int nCopies)

Deprecated.

Adds a new element to the bag by incrementing its count in the map.

Specified by:

add in interface Bag

Parameters:

object - the object to search for

nCopies - the number of copies to add

Returns:

true if the object was not already in the uniqueSet

addAll

public boolean addAll(java.util.Collection coll)

Deprecated.

Invokes add(Object) for each element in the given collection.

Specified by:

addAll in interface java.util.Collection

Parameters:

coll - the collection to add

Returns:

true if this call changed the bag

clear

public void clear()

Deprecated.

Clears the bag by clearing the underlying map.

Specified by:

clear in interface java.util.Collection

contains

public boolean contains(java.lang.Object object)

Deprecated.

Determines if the bag contains the given element by checking if the underlying map contains the element as a key.

Specified by:

contains in interface java.util.Collection

Parameters:

object - the object to search for

Returns:

true if the bag contains the given element

containsAll

public boolean containsAll(java.util.Collection coll)

Deprecated.

Determines if the bag contains the given elements.

Specified by:

containsAll in interface Bag

Specified by:

containsAll in interface java.util.Collection

Parameters:

coll - the collection to check against

Returns:

true if the Bag contains all the collection

containsAll

public boolean containsAll(Bag other)

Deprecated.

Returns true if the bag contains all elements in the given collection, respecting cardinality.

Parameters:

other - the bag to check against

Returns:

true if the Bag contains all the collection

equals

public boolean equals(java.lang.Object object)

Deprecated.

Returns true if the given object is not null, has the precise type of this bag, and contains the same number of occurrences of all the same elements.

Specified by:

equals in interface java.util.Collection

Overrides:

equals in class java.lang.Object

Parameters:

object - the object to test for equality

Returns:

true if that object equals this bag

hashCode

public int hashCode()

Deprecated.

Returns the hash code of the underlying map.

Specified by:

hashCode in interface java.util.Collection

Overrides:

hashCode in class java.lang.Object

Returns:

the hash code of the underlying map

isEmpty

public boolean isEmpty()

Deprecated.

Returns true if the underlying map is empty.

Specified by:

isEmpty in interface java.util.Collection

Returns:

true if there are no elements in this bag

iterator

public java.util.Iterator iterator()

Deprecated.

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 Bag

Specified by:

iterator in interface java.util.Collection

Specified by:

iterator in interface java.lang.Iterable

Returns:

iterator over all elements in the Bag

remove

public boolean remove(java.lang.Object object)

Deprecated.

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 Bag

Specified by:

remove in interface java.util.Collection

Returns:

true if this call changed the collection

remove

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

Deprecated.

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

Parameters:

object - the object to remove

nCopies - the number of copies to remove

Returns:

true if this call changed the collection

removeAll

public boolean removeAll(java.util.Collection coll)

Deprecated.

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 Bag

Specified by:

removeAll in interface java.util.Collection

Parameters:

coll - the collection to remove

Returns:

true if this call changed the collection

retainAll

public boolean retainAll(java.util.Collection coll)

Deprecated.

Remove any members of the bag that are not in the given bag, respecting cardinality.

Specified by:

retainAll in interface Bag

Specified by:

retainAll in interface java.util.Collection

Parameters:

coll - the collection to retain

Returns:

true if this call changed the collection

retainAll

public boolean retainAll(Bag other)

Deprecated.

Remove any members of the bag that are not in the given bag, respecting cardinality.

Parameters:

other - the bag to retain

Returns:

true if this call changed the collection

See Also:

retainAll(Collection)

toArray

public java.lang.Object[] toArray()

Deprecated.

Returns an array of all of this bag's elements.

Specified by:

toArray in interface java.util.Collection

Returns:

an array of all of this bag's elements

toArray

public java.lang.Object[] toArray(java.lang.Object[] array)

Deprecated.

Returns an array of all of this bag's elements.

Specified by:

toArray in interface java.util.Collection

Parameters:

array - the array to populate

Returns:

an array of all of this bag's elements

getCount

public int getCount(java.lang.Object object)

Deprecated.

Returns the number of occurrence of the given element in this bag by looking up its count in the underlying map.

Specified by:

getCount in interface Bag

Parameters:

object - the object to search for

Returns:

the number of occurrences of the object, zero if not found

uniqueSet

public java.util.Set uniqueSet()

Deprecated.

Returns an unmodifiable view of the underlying map's key set.

Specified by:

uniqueSet in interface Bag

Returns:

the set of unique elements in this bag

size

public int size()

Deprecated.

Returns the number of elements in this bag.

Specified by:

size in interface Bag

Specified by:

size in interface java.util.Collection

Returns:

the number of elements in this bag

toString

public java.lang.String toString()

Deprecated.

Implement a toString() method suitable for debugging.

Overrides:

toString in class java.lang.Object

Returns:

a debugging toString