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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections.bag

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.commons.collections.collection .PredicatedCollection

org.apache.commons.collections.bag .PredicatedBag

All known Subclasses:   org.apache.commons.collections.bag .PredicatedSortedBag,
PredicatedBag
public class PredicatedBag extends PredicatedCollection implements Bag(Code)
Decorates another Bag 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.
Bag bag = PredicatedBag.decorate(new HashBag(), NotNullPredicate.INSTANCE);

This class is Serializable from Commons Collections 3.1.
since:
   Commons Collections 3.0
version:
   $Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
author:
   Stephen Colebourne
author:
   Paul Jack

Constructor Summary
protected PredicatedBag(Bag bag, Predicate predicate)
     Constructor that wraps (not copies).

Method Summary
public boolean add(Object object, int count)

public static Bag decorate(Bag bag, Predicate predicate)
     Factory method to create a predicated (validating) bag.
protected Bag getBag()
     Gets the decorated bag.
public int getCount(Object object)

public boolean remove(Object object, int count)

public Set uniqueSet()


Constructor Detail
PredicatedBag
protected PredicatedBag(Bag bag, Predicate predicate)(Code)
Constructor that wraps (not copies).
If there are any elements already in the bag being decorated, they are validated.
Parameters:
  bag - the bag to decorate, must not be null
Parameters:
  predicate - the predicate to use for validation, must not be null
throws:
  IllegalArgumentException - if bag or predicate is null
throws:
  IllegalArgumentException - if the bag contains invalid elements

Method Detail
add
public boolean add(Object object, int count)(Code)

decorate
public static Bag decorate(Bag bag, Predicate predicate)(Code)
Factory method to create a predicated (validating) bag.
If there are any elements already in the bag being decorated, they are validated.
Parameters:
  bag - the bag to decorate, must not be null
Parameters:
  predicate - the predicate to use for validation, must not be null a new predicated Bag
throws:
  IllegalArgumentException - if bag or predicate is null
throws:
  IllegalArgumentException - if the bag contains invalid elements

getBag
protected Bag getBag()(Code)
Gets the decorated bag. the decorated bag

getCount
public int getCount(Object object)(Code)

remove
public boolean remove(Object object, int count)(Code)

uniqueSet
public Set uniqueSet()(Code)

Fields inherited from org.apache.commons.collections.collection.PredicatedCollection
final protected Predicate predicate(Code)(Java Doc)

Methods inherited from org.apache.commons.collections.collection.PredicatedCollection
public boolean add(Object object)(Code)(Java Doc)
public boolean addAll(Collection coll)(Code)(Java Doc)
public static Collection decorate(Collection coll, Predicate predicate)(Code)(Java Doc)
protected void validate(Object object)(Code)(Java Doc)

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