PersistentBag (Hibernate JavaDocs)
Date: 2012-04-05

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## org.hibernate.collection.internal
Class PersistentBag

    java.lang.Object
      org.hibernate.collection.internal.AbstractPersistentCollection
          org.hibernate.collection.internal.PersistentBag

All Implemented Interfaces:
  Serializable, Iterable, Collection, List, PersistentCollection

    public class PersistentBag

extends AbstractPersistentCollection
implements List

An unordered, unkeyed collection that can contain the same element multiple times. The Java collections API, curiously, has no `Bag`. Most developers seem to use `List`s to represent bag semantics, so Hibernate follows this practice.

See Also:
  Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.hibernate.collection.internal.AbstractPersistentCollection
`AbstractPersistentCollection.DelayedOperation, AbstractPersistentCollection.IteratorProxy, AbstractPersistentCollection.ListIteratorProxy, AbstractPersistentCollection.ListProxy, AbstractPersistentCollection.SetProxy`

Field Summary
`protected List` | `bag`

Fields inherited from class org.hibernate.collection.internal.AbstractPersistentCollection
`UNKNOWN`

Constructor Summary
`PersistentBag()`
`PersistentBag(SessionImplementor session)`
`PersistentBag(SessionImplementor session, Collection coll)`

Method Summary
`void` | `add(int i, Object o)`
`boolean` | `add(Object object)`
`boolean` | `addAll(Collection values)`
`boolean` | `addAll(int i, Collection c)`
`void` | `beforeInitialize(CollectionPersister persister, int anticipatedSize)` Called before any elements are read into the collection, allowing appropriate initializations to occur.
`void` | `clear()`
`boolean` | `contains(Object object)`
`boolean` | `containsAll(Collection c)`
`Serializable` | `disassemble(CollectionPersister persister)` Disassemble the collection, ready for the cache
`boolean` | `empty()` Is the initialized collection empty?
`Iterator` | `entries(CollectionPersister persister)` Iterate all collection entries, during update of the database
`boolean` | `entryExists(Object entry, int i)` Does an element exist at this entry in the collection?
`boolean` | `equals(Object obj)` Bag does not respect the collection API and do an JVM instance comparison to do the equals.
`boolean` | `equalsSnapshot(CollectionPersister persister)` Does the current state exactly match the snapshot?
`Object` | `get(int i)`
`Iterator` | `getDeletes(CollectionPersister persister, boolean indexIsFormula)` Get all the elements that need deleting
`Object` | `getElement(Object entry)` Get the value of the given collection entry
`Object` | `getIndex(Object entry, int i, CollectionPersister persister)` Get the index of the given collection entry
`Collection` | `getOrphans(Serializable snapshot, String entityName)` get all "orphaned" elements
`Serializable` | `getSnapshot(CollectionPersister persister)` Return a new snapshot of the current state of the collection
`Object` | `getSnapshotElement(Object entry, int i)` Get the snapshot value of the given collection entry
`int` | `hashCode()`
`int` | `indexOf(Object o)`
`void` | `initializeFromCache(CollectionPersister persister, Serializable disassembled, Object owner)` Read the state of the collection from a disassembled cached value
`boolean` | `isEmpty()`
`boolean` | `isRowUpdatePossible()`
`boolean` | `isSnapshotEmpty(Serializable snapshot)` Is the snapshot empty?
`boolean` | `isWrapper(Object collection)` Is this the wrapper for the given underlying collection instance?
`Iterator` | `iterator()`
`int` | `lastIndexOf(Object o)`
`ListIterator` | `listIterator()`
`ListIterator` | `listIterator(int i)`
`boolean` | `needsInserting(Object entry, int i, Type elemType)` Do we need to insert this element?
`boolean` | `needsRecreate(CollectionPersister persister)` Do we need to completely recreate this collection when it changes?
`boolean` | `needsUpdating(Object entry, int i, Type elemType)` Do we need to update this element?
`int` | `occurrences(Object o)`
`Object` | `readFrom(ResultSet rs, CollectionPersister persister, CollectionAliases descriptor, Object owner)` Read a row from the JDBC result set
`Object` | `remove(int i)`
`boolean` | `remove(Object o)`
`boolean` | `removeAll(Collection c)`
`boolean` | `retainAll(Collection c)`
`Object` | `set(int i, Object o)`
`int` | `size()`
`List` | `subList(int start, int end)`
`Object[]` | `toArray()`
`Object[]` | `toArray(Object[] a)`
`String` | `toString()`

Methods inherited from class org.hibernate.collection.internal.AbstractPersistentCollection
`afterInitialize, afterRowInsert, beginRead, clearDirty, dirty, endRead, forceInitialization, getCachedSize, getIdentifier, getKey, getOrphans, getOwner, getQueuedOrphans, getRole, getSession, getSnapshot, getStoredSnapshot, getValue, hasQueuedOperations, identityRemove, initialize, isClearQueueEnabled, isDirectlyAccessible, isDirty, isOperationQueueEnabled, isPutQueueEnabled, isUnreferenced, performQueuedOperations, postAction, preInsert, queuedAdditionIterator, queueOperation, read, readElementByIndex, readElementExistence, readIndexExistence, readSize, setCurrentSession, setDirectlyAccessible, setInitialized, setOwner, setSnapshot, unsetSession, wasInitialized, write`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

### bag

    protected List bag

Constructor Detail

### PersistentBag

    public PersistentBag(SessionImplementor session)

### PersistentBag

    public PersistentBag(SessionImplementor session,
                         Collection coll)

### PersistentBag

    public PersistentBag()

Method Detail

### isWrapper

    public boolean isWrapper(Object collection)

  Description copied from interface: `PersistentCollection`
  Is this the wrapper for the given underlying collection instance?

  Specified by:
    `isWrapper` in interface `PersistentCollection`

### empty

    public boolean empty()

  Description copied from class: `AbstractPersistentCollection`
  Is the initialized collection empty?

  Specified by:
    `empty` in interface `PersistentCollection`
  Specified by:
    `empty` in class `AbstractPersistentCollection`

### entries

    public Iterator entries(CollectionPersister persister)

  Description copied from interface: `PersistentCollection`
  Iterate all collection entries, during update of the database

  Specified by:
    `entries` in interface `PersistentCollection`

### readFrom

    public Object readFrom(ResultSet rs,
                           CollectionPersister persister,
                           CollectionAliases descriptor,
                           Object owner)
                    throws HibernateException,
                           SQLException

  Description copied from interface: `PersistentCollection`
  Read a row from the JDBC result set

  Specified by:
    `readFrom` in interface `PersistentCollection`
  Throws:
    `HibernateException`
    `SQLException`

### beforeInitialize

    public void beforeInitialize(CollectionPersister persister,
                                 int anticipatedSize)

  Description copied from interface: `PersistentCollection`
  Called before any elements are read into the collection, allowing appropriate initializations to occur.

  Specified by:
    `beforeInitialize` in interface `PersistentCollection`
  Parameters:
    `persister` - The underlying collection persister.
    `anticipatedSize` - The anticipated size of the collection after initilization is complete.

### equalsSnapshot

    public boolean equalsSnapshot(CollectionPersister persister)
                           throws HibernateException

  Description copied from interface: `PersistentCollection`
  Does the current state exactly match the snapshot?

  Specified by:
    `equalsSnapshot` in interface `PersistentCollection`
  Throws:
    `HibernateException`

### isSnapshotEmpty

    public boolean isSnapshotEmpty(Serializable snapshot)

  Description copied from interface: `PersistentCollection`
  Is the snapshot empty?

  Specified by:
    `isSnapshotEmpty` in interface `PersistentCollection`

### getSnapshot

    public Serializable getSnapshot(CollectionPersister persister)
                             throws HibernateException

  Description copied from interface: `PersistentCollection`
  Return a new snapshot of the current state of the collection

  Specified by:
    `getSnapshot` in interface `PersistentCollection`
  Throws:
    `HibernateException`

### getOrphans

    public Collection getOrphans(Serializable snapshot,
                                 String entityName)
                          throws HibernateException

  Description copied from class: `AbstractPersistentCollection`
  get all "orphaned" elements

  Specified by:
    `getOrphans` in interface `PersistentCollection`
  Specified by:
    `getOrphans` in class `AbstractPersistentCollection`
  Throws:
    `HibernateException`

### disassemble

    public Serializable disassemble(CollectionPersister persister)
                             throws HibernateException

  Description copied from interface: `PersistentCollection`
  Disassemble the collection, ready for the cache

  Specified by:
    `disassemble` in interface `PersistentCollection`
  Throws:
    `HibernateException`

### initializeFromCache

    public void initializeFromCache(CollectionPersister persister,
                                    Serializable disassembled,
                                    Object owner)
                             throws HibernateException

  Description copied from interface: `PersistentCollection`
  Read the state of the collection from a disassembled cached value

  Specified by:
    `initializeFromCache` in interface `PersistentCollection`
  Throws:
    `HibernateException`

### needsRecreate

    public boolean needsRecreate(CollectionPersister persister)

  Description copied from class: `AbstractPersistentCollection`
  Do we need to completely recreate this collection when it changes?

  Specified by:
    `needsRecreate` in interface `PersistentCollection`
  Overrides:
    `needsRecreate` in class `AbstractPersistentCollection`

### getDeletes

    public Iterator getDeletes(CollectionPersister persister,
                               boolean indexIsFormula)
                        throws HibernateException

  Description copied from interface: `PersistentCollection`
  Get all the elements that need deleting

  Specified by:
    `getDeletes` in interface `PersistentCollection`
  Throws:
    `HibernateException`

### needsInserting

    public boolean needsInserting(Object entry,
                                  int i,
                                  Type elemType)
                           throws HibernateException

  Description copied from interface: `PersistentCollection`
  Do we need to insert this element?

  Specified by:
    `needsInserting` in interface `PersistentCollection`
  Throws:
    `HibernateException`

### isRowUpdatePossible

    public boolean isRowUpdatePossible()

  Specified by:
    `isRowUpdatePossible` in interface `PersistentCollection`
  Overrides:
    `isRowUpdatePossible` in class `AbstractPersistentCollection`

### needsUpdating

    public boolean needsUpdating(Object entry,
                                 int i,
                                 Type elemType)

  Description copied from interface: `PersistentCollection`
  Do we need to update this element?

  Specified by:
    `needsUpdating` in interface `PersistentCollection`

### size

    public int size()

  Specified by:
    `size` in interface `Collection`
  Specified by:
    `size` in interface `List`
  See Also:
    `Collection.size()`

### isEmpty

    public boolean isEmpty()

  Specified by:
    `isEmpty` in interface `Collection`
  Specified by:
    `isEmpty` in interface `List`
  See Also:
    `Collection.isEmpty()`

### contains

    public boolean contains(Object object)

  Specified by:
    `contains` in interface `Collection`
  Specified by:
    `contains` in interface `List`
  See Also:
    `Collection.contains(Object)`

### iterator

    public Iterator iterator()

  Specified by:
    `iterator` in interface `Iterable`
  Specified by:
    `iterator` in interface `Collection`
  Specified by:
    `iterator` in interface `List`
  See Also:
    `Collection.iterator()`

### toArray

    public Object[] toArray()

  Specified by:
    `toArray` in interface `Collection`
  Specified by:
    `toArray` in interface `List`
  See Also:
    `Collection.toArray()`

### toArray

    public Object[] toArray(Object[] a)

  Specified by:
    `toArray` in interface `Collection`
  Specified by:
    `toArray` in interface `List`
  See Also:
    `Collection.toArray(Object[])`

### add

    public boolean add(Object object)

  Specified by:
    `add` in interface `Collection`
  Specified by:
    `add` in interface `List`
  See Also:
    `Collection.add(Object)`

### remove

    public boolean remove(Object o)

  Specified by:
    `remove` in interface `Collection`
  Specified by:
    `remove` in interface `List`
  See Also:
    `Collection.remove(Object)`

### containsAll

    public boolean containsAll(Collection c)

  Specified by:
    `containsAll` in interface `Collection`
  Specified by:
    `containsAll` in interface `List`
  See Also:
    `Collection.containsAll(Collection)`

### addAll

    public boolean addAll(Collection values)

  Specified by:
    `addAll` in interface `Collection`
  Specified by:
    `addAll` in interface `List`
  See Also:
    `Collection.addAll(Collection)`

### removeAll

    public boolean removeAll(Collection c)

  Specified by:
    `removeAll` in interface `Collection`
  Specified by:
    `removeAll` in interface `List`
  See Also:
    `Collection.removeAll(Collection)`

### retainAll

    public boolean retainAll(Collection c)

  Specified by:
    `retainAll` in interface `Collection`
  Specified by:
    `retainAll` in interface `List`
  See Also:
    `Collection.retainAll(Collection)`

### clear

    public void clear()

  Specified by:
    `clear` in interface `Collection`
  Specified by:
    `clear` in interface `List`
  See Also:
    `Collection.clear()`

### getIndex

    public Object getIndex(Object entry,
                           int i,
                           CollectionPersister persister)

  Description copied from interface: `PersistentCollection`
  Get the index of the given collection entry

  Specified by:
    `getIndex` in interface `PersistentCollection`
    `persister` - it was more elegant before we added this...

### getElement

    public Object getElement(Object entry)

  Description copied from interface: `PersistentCollection`
  Get the value of the given collection entry

  Specified by:
    `getElement` in interface `PersistentCollection`

### getSnapshotElement

    public Object getSnapshotElement(Object entry,
                                     int i)

  Description copied from interface: `PersistentCollection`
  Get the snapshot value of the given collection entry

  Specified by:
    `getSnapshotElement` in interface `PersistentCollection`

### occurrences

    public int occurrences(Object o)

### add

    public void add(int i,
                    Object o)

  Specified by:
    `add` in interface `List`
  See Also:
    `List.add(int, Object)`

### addAll

    public boolean addAll(int i,
                          Collection c)

  Specified by:
    `addAll` in interface `List`
  See Also:
    `List.addAll(int, Collection)`

### get

    public Object get(int i)

  Specified by:
    `get` in interface `List`
  See Also:
    `List.get(int)`

### indexOf

    public int indexOf(Object o)

  Specified by:
    `indexOf` in interface `List`
  See Also:
    `List.indexOf(Object)`

### lastIndexOf

    public int lastIndexOf(Object o)

  Specified by:
    `lastIndexOf` in interface `List`
  See Also:
    `List.lastIndexOf(Object)`

### listIterator

    public ListIterator listIterator()

  Specified by:
    `listIterator` in interface `List`
  See Also:
    `List.listIterator()`

### listIterator

    public ListIterator listIterator(int i)

  Specified by:
    `listIterator` in interface `List`
  See Also:
    `List.listIterator(int)`

### remove

    public Object remove(int i)

  Specified by:
    `remove` in interface `List`
  See Also:
    `List.remove(int)`

### set

    public Object set(int i,
                      Object o)

  Specified by:
    `set` in interface `List`
  See Also:
    `List.set(int, Object)`

### subList

    public List subList(int start,
                        int end)

  Specified by:
    `subList` in interface `List`
  See Also:
    `List.subList(int, int)`

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### entryExists

    public boolean entryExists(Object entry,
                               int i)

  Description copied from interface: `PersistentCollection`
  Does an element exist at this entry in the collection?

  Specified by:
    `entryExists` in interface `PersistentCollection`

### equals

    public boolean equals(Object obj)

  Bag does not respect the collection API and do an JVM instance comparison to do the equals. The semantic is broken not to have to initialize a collection for a simple equals() operation.

  Specified by:
    `equals` in interface `Collection`
  Specified by:
    `equals` in interface `List`
  Overrides:
    `equals` in class `Object`
  See Also:
    `Object.equals(java.lang.Object)`

### hashCode

    public int hashCode()

  Specified by:
    `hashCode` in interface `Collection`
  Specified by:
    `hashCode` in interface `List`
  Overrides:
    `hashCode` in class `Object`
  See Also:
    `Object.hashCode()`

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