public abstract class StoredContainer
extends java.lang.Object
implements java.lang.Cloneable
Collection
and the Map
interfaces, namely
clear()
, isEmpty()
and size()
.
In addition, this class provides the following methods for stored collections only. Note that the use of these methods is not compatible with the standard Java collections interface.
Modifier and Type | Method and Description |
---|---|
boolean |
areDuplicatesAllowed()
Returns whether duplicate keys are allowed in this container.
|
boolean |
areDuplicatesOrdered()
Returns whether duplicate keys are allowed and sorted by element value.
|
boolean |
areKeyRangesAllowed()
Returns whether key ranges are allowed in this container.
|
boolean |
areKeysRenumbered()
Returns whether keys are renumbered when insertions and deletions occur.
|
void |
clear()
Removes all mappings or elements from this map or collection (optional
operation).
|
CursorConfig |
getCursorConfig()
Returns the cursor configuration that is used for all operations
performed via this container.
|
boolean |
isDirtyRead()
Deprecated.
This method has been replaced by
getCursorConfig() .
CursorConfig.isReadUncommitted may be called to determine
whether dirty-read is enabled. |
boolean |
isDirtyReadAllowed()
Deprecated.
This method is deprecated with no replacement in this class.
In the DB product,
DatabaseConfig.getReadUncommitted may be
called. |
boolean |
isEmpty()
Returns true if this map or collection contains no mappings or elements.
|
boolean |
isOrdered()
Returns whether keys are ordered in this container.
|
boolean |
isSecondary()
Returns whether this container is a view on a secondary database rather
than directly on a primary database.
|
boolean |
isTransactional()
Returns whether the databases underlying this container are
transactional.
|
boolean |
isWriteAllowed()
Returns true if this is a read-write container or false if this is a
read-only container.
|
abstract int |
size()
Returns a non-transactional count of the records in the collection or
map.
|
public final boolean isWriteAllowed()
Map
or
Collection
interfaces.public final CursorConfig getCursorConfig()
CursorConfig.getReadUncommitted
returns
true, data will be read that is modified but not committed.
This method does not exist in the standard Map
or
Collection
interfaces.public final boolean isDirtyReadAllowed()
DatabaseConfig.getReadUncommitted
may be
called.StoredCollections
methods.
This method does not exist in the standard Map
or
Collection
interfaces.public final boolean isDirtyRead()
getCursorConfig()
.
CursorConfig.isReadUncommitted
may be called to determine
whether dirty-read is enabled.public final boolean isTransactional()
Map
or
Collection
interfaces.public final boolean areDuplicatesAllowed()
Map
or
Collection
interfaces.
Note that the JE product only supports BTREE databases.
public final boolean areDuplicatesOrdered()
Map
or
Collection
interfaces.
Note that the JE product only supports BTREE databases, and duplicates are always sorted.
public final boolean areKeysRenumbered()
Map
or
Collection
interfaces.
Note that the JE product does not support RECNO databases, and therefore keys are never renumbered.
public final boolean isOrdered()
Map
or
Collection
interfaces.
Note that the JE product only support BTREE databases, and therefore keys are always ordered.
public final boolean areKeyRangesAllowed()
Map
or
Collection
interfaces.
Note that the JE product only supports BTREE databases, and therefore key ranges are always allowed.
public final boolean isSecondary()
Map
or
Collection
interfaces.public abstract int size()
Collection.size()
and
Map.size()
interfaces.
This operation is faster than obtaining a count by scanning the collection manually, and will not perturb the current contents of the cache. However, the count is not guaranteed to be accurate if there are concurrent updates.
RuntimeExceptionWrapper
- if a DatabaseException
is thrown.public boolean isEmpty()
Collection.isEmpty()
and
Map.isEmpty()
interfaces.RuntimeExceptionWrapper
- if a DatabaseException
is thrown.public void clear()
Collection.clear()
and
Map.clear()
interfaces.java.lang.UnsupportedOperationException
- if the container is read-only.RuntimeExceptionWrapper
- if a DatabaseException
is thrown.