|
Berkeley DB version 5.3.21 |
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectcom.sleepycat.collections.StoredContainer
com.sleepycat.collections.StoredCollection<K>
com.sleepycat.collections.StoredKeySet<K>
public class StoredKeySet<K>
The Set returned by Map.keySet() and which can also be constructed directly if a Map is not needed. Since this collection is a set it only contains one element for each key, even when duplicates are allowed. Key set iterators are therefore particularly useful for enumerating the unique keys of a store or index that allows duplicates.
Field Summary |
---|
Fields inherited from class com.sleepycat.collections.StoredCollection |
---|
DEFAULT_ITERATOR_BLOCK_SIZE |
Constructor Summary | |
---|---|
StoredKeySet(Database database,
EntryBinding<K> keyBinding,
boolean writeAllowed)
Creates a key set view of a Database . |
Method Summary | |
---|---|
boolean |
add(K key)
Adds the specified key to this set if it is not already present (optional operation). |
boolean |
contains(Object key)
Returns true if this set contains the specified key. |
boolean |
remove(Object key)
Removes the specified key from this set if it is present (optional operation). |
Methods inherited from class com.sleepycat.collections.StoredCollection |
---|
addAll, containsAll, equals, getIteratorBlockSize, hashCode, iterator, iterator, join, removeAll, retainAll, setIteratorBlockSize, size, storedIterator, storedIterator, toArray, toArray, toList, toString |
Methods inherited from class com.sleepycat.collections.StoredContainer |
---|
areDuplicatesAllowed, areDuplicatesOrdered, areKeyRangesAllowed, areKeysRenumbered, clear, getCursorConfig, isEmpty, isOrdered, isSecondary, isTransactional, isWriteAllowed |
Methods inherited from class java.lang.Object |
---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.Set |
---|
addAll, clear, containsAll, equals, hashCode, isEmpty, iterator, removeAll, retainAll, size, toArray, toArray |
Constructor Detail |
---|
public StoredKeySet(Database database, EntryBinding<K> keyBinding, boolean writeAllowed)
Database
.
database
- is the Database underlying the new collection.keyBinding
- is the binding used to translate between key buffers
and key objects.writeAllowed
- is true to create a read-write collection or false
to create a read-only collection.
IllegalArgumentException
- if formats are not consistently
defined or a parameter is invalid.
RuntimeExceptionWrapper
- if a checked exception is thrown,
including a DatabaseException
on BDB (C Edition).Method Detail |
---|
public boolean add(K key)
Set.add(E)
interface.
WARNING: When a key is added the value in the underlying data store will be empty, i.e., the byte array will be zero length. Such a record cannot be accessed using the Map interface unless the value binding supports zero length byte arrays.
add
in interface Collection<K>
add
in interface Set<K>
UnsupportedOperationException
- if the collection is indexed, or
if the collection is read-only.
RuntimeExceptionWrapper
- if a checked exception is thrown,
including a DatabaseException
on BDB (C Edition).public boolean remove(Object key)
Set.remove(java.lang.Object)
interface.
remove
in interface Collection<K>
remove
in interface Set<K>
UnsupportedOperationException
- if the collection is read-only.
RuntimeExceptionWrapper
- if a checked exception is thrown,
including a DatabaseException
on BDB (C Edition).public boolean contains(Object key)
Set.contains(java.lang.Object)
interface.
contains
in interface Collection<K>
contains
in interface Set<K>
RuntimeExceptionWrapper
- if a checked exception is thrown,
including a DatabaseException
on BDB (C Edition).
|
Berkeley DB version 5.3.21 |
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |