java.lang.Object
- org.apache.commons.collections.DefaultMapBag

All Implemented Interfaces:

Iterable, Collection, Bag

Direct Known Subclasses:

HashBag, TreeBag
```
public abstract class DefaultMapBag
extends 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

Version:

$Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $

Author:

Chuck Burdick, Michael A. Smith, Stephen Colebourne, Janek Bogucki

Constructor Summary

Constructors
Modifier	Constructor	Description
	`DefaultMapBag()`	Deprecated. No-argument constructor.
`protected`	`DefaultMapBag(Map map)`	Deprecated. Constructor that assigns the specified Map as the backing store.

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`boolean`	`add(Object object)`	Deprecated. Adds a new element to the bag by incrementing its count in the underlying map.
`boolean`	`add(Object object, int nCopies)`	Deprecated. Adds a new element to the bag by incrementing its count in the map.
`boolean`	`addAll(Collection coll)`	Deprecated. Invokes `add(Object)` for each element in the given collection.
`protected int`	`calcTotalSize()`	Deprecated. Actually walks the bag to make sure the count is correct and resets the running total
`void`	`clear()`	Deprecated. Clears the bag by clearing the underlying map.
`boolean`	`contains(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(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(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(Object object)`	Deprecated. Returns the number of occurrence of the given element in this bag by looking up its count in the underlying map.
`protected Map`	`getMap()`	Deprecated. Utility method for implementations to access the map that backs this bag.
`int`	`hashCode()`	Deprecated. Returns the hash code of the underlying map.
`boolean`	`isEmpty()`	Deprecated. Returns true if the underlying map is empty.
`Iterator`	`iterator()`	Deprecated. Returns an `Iterator` over the entire set of members, including copies due to cardinality.
`boolean`	`remove(Object object)`	Deprecated. (Violation) Removes all occurrences of the given object from the bag.
`boolean`	`remove(Object object, int nCopies)`	Deprecated. Removes `nCopies` copies of the specified object from the Bag.
`boolean`	`removeAll(Collection coll)`	Deprecated. (Violation) Remove all elements represented in the given collection, respecting cardinality.
`boolean`	`retainAll(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.
`protected void`	`setMap(Map map)`	Deprecated. Utility method for implementations to set the map that backs this bag.
`int`	`size()`	Deprecated. Returns the number of elements in this bag.
`Object[]`	`toArray()`	Deprecated. Returns an array of all of this bag's elements.
`Object[]`	`toArray(Object[] array)`	Deprecated. Returns an array of all of this bag's elements.
`String`	`toString()`	Deprecated. Implement a toString() method suitable for debugging.
`Set`	`uniqueSet()`	Deprecated. Returns an unmodifiable view of the underlying map's key set.

Methods inherited from class java.lang.Object
clone, finalize, 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.
  - DefaultMapBag
```
protected DefaultMapBag(Map map)
```
    Deprecated.
    
    Constructor that assigns the specified Map as the backing store. The map must be empty.
    
    Parameters:
    
    map - the map to assign
- Method Detail
  - add
```
public boolean add(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 Collection
    
    Parameters:
    
    object - the object to add
    
    Returns:
    
    true if the object was not already in the uniqueSet
  - add
```
public boolean add(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(Collection coll)
```
    Deprecated.
    
    Invokes add(Object) for each element in the given collection.
    
    Specified by:
    
    addAll in interface 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 Collection
  - contains
```
public boolean contains(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 Collection
    
    Parameters:
    
    object - the object to search for
    
    Returns:
    
    true if the bag contains the given element
  - containsAll
```
public boolean containsAll(Collection coll)
```
    Deprecated.
    
    Determines if the bag contains the given elements.
    
    Specified by:
    
    containsAll in interface Bag
    
    Specified by:
    
    containsAll in interface 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(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 Collection
    
    Overrides:
    
    equals in class 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 Collection
    
    Overrides:
    
    hashCode in class 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 Collection
    
    Returns:
    
    true if there are no elements in this bag
  - iterator
```
public 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 Collection
    
    Specified by:
    
    iterator in interface Iterable
    
    Returns:
    
    iterator over all elements in the Bag
  - remove
```
public boolean remove(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 Collection
    
    Returns:
    
    true if this call changed the collection
  - remove
```
public boolean remove(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(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 Collection
    
    Parameters:
    
    coll - the collection to remove
    
    Returns:
    
    true if this call changed the collection
  - retainAll
```
public boolean retainAll(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 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 Object[] toArray()
```
    Deprecated.
    
    Returns an array of all of this bag's elements.
    
    Specified by:
    
    toArray in interface Collection
    
    Returns:
    
    an array of all of this bag's elements
  - toArray
```
public Object[] toArray(Object[] array)
```
    Deprecated.
    
    Returns an array of all of this bag's elements.
    
    Specified by:
    
    toArray in interface Collection
    
    Parameters:
    
    array - the array to populate
    
    Returns:
    
    an array of all of this bag's elements
  - getCount
```
public int getCount(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 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 Collection
    
    Returns:
    
    the number of elements in this bag
  - calcTotalSize
```
protected int calcTotalSize()
```
    Deprecated.
    
    Actually walks the bag to make sure the count is correct and resets the running total
    
    Returns:
    
    the current total size
  - setMap
```
protected void setMap(Map map)
```
    Deprecated.
    
    Utility method for implementations to set the map that backs this bag. Not intended for interactive use outside of subclasses.
  - getMap
```
protected Map getMap()
```
    Deprecated.
    
    Utility method for implementations to access the map that backs this bag. Not intended for interactive use outside of subclasses.
  - toString
```
public String toString()
```
    Deprecated.
    
    Implement a toString() method suitable for debugging.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a debugging toString

Class DefaultMapBag

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Collection

Methods inherited from interface java.lang.Iterable

Constructor Detail

DefaultMapBag

DefaultMapBag

Method Detail

add

add

addAll

clear

contains

containsAll

containsAll

equals

hashCode

isEmpty

iterator

remove

remove

removeAll

retainAll

retainAll

toArray

toArray

getCount

uniqueSet

size

calcTotalSize

setMap

getMap

toString