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java.lang.Objectcom.sleepycat.collections.StoredContainer
A abstract base class for all stored collections and maps. This
class provides implementations of methods that are common to the Collection
and
the Map
interfaces, namely clear()
,
isEmpty()
and size()
.
Note that this class does not conform to the standard Java collections interface in the following ways:
size()
method always throws UnsupportedOperationException
because, for performance reasons, databases do not maintain their total
record count.StoredIterator.close()
or StoredIterator.close(java.util.Iterator)
to release the underlying database cursor resources.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.
isWriteAllowed()
isSecondary()
isOrdered()
areDuplicatesAllowed()
areDuplicatesOrdered()
areKeysRenumbered()
isDirtyReadAllowed()
isDirtyRead()
isTransactional()
Method Summary | |
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 |
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). |
boolean |
isDirtyRead()
Returns whether dirty-read is enabled for this container. |
boolean |
isDirtyReadAllowed()
Returns whether dirty-read is allowed for this container. |
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. |
int |
size()
Always throws UnsupportedOperationException. |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
public final boolean isWriteAllowed()
Map
or Collection
interfaces.
public final boolean isDirtyReadAllowed()
StoredCollections
methods. This method does not exist in the standard Map
or Collection
interfaces.
public final boolean isDirtyRead()
isDirtyReadAllowed()
returns false. This method does not exist in the standard Map
or Collection
interfaces.
public final boolean isTransactional()
Map
or Collection
interfaces.
public final boolean areDuplicatesAllowed()
Map
or Collection
interfaces.
public final boolean areDuplicatesOrdered()
Map
or Collection
interfaces.
public final boolean areKeysRenumbered()
Map
or Collection
interfaces.
public final boolean isOrdered()
Map
or Collection
interfaces.
public final boolean isSecondary()
Map
or Collection
interfaces.
public int size()
Collection.size()
and Map.size()
interfaces.
UnsupportedOperationException
- unconditionally.
public boolean isEmpty()
Collection.isEmpty()
and Map.isEmpty()
interfaces.
RuntimeExceptionWrapper
- if
a DatabaseException
is thrown.
public void clear()
Collection.clear()
and Map.clear()
interfaces.
UnsupportedOperationException
- if the container is read-only.
RuntimeExceptionWrapper
- if
a DatabaseException
is thrown.
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Berkeley
DB Java Edition version 1.7.1 |
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