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java.lang.Object
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+--com.sleepycat.bdb.collection.StoredContainer
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+--com.sleepycat.bdb.collection.StoredCollection
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+--com.sleepycat.bdb.collection.StoredKeySet
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+--com.sleepycat.bdb.collection.StoredSortedKeySet
The SortedSet 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.
In addition to the standard SortedSet methods, this class provides the following methods for stored sorted sets only. Note that the use of these methods is not compatible with the standard Java collections interface.
| Constructor Summary | |
StoredSortedKeySet(DataIndex index,
DataBinding keyBinding,
boolean writeAllowed)
Creates a sorted key set view of a DataIndex. |
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StoredSortedKeySet(DataStore store,
DataBinding keyBinding,
boolean writeAllowed)
Creates a sorted key set view of a DataStore. |
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| Method Summary | |
Comparator |
comparator()
Returns null since comparators are not supported. |
Object |
first()
Returns the first (lowest) element currently in this sorted set. |
SortedSet |
headSet(Object toKey)
Returns a view of the portion of this sorted set whose elements are strictly less than toKey. |
SortedSet |
headSet(Object toKey,
boolean toInclusive)
Returns a view of the portion of this sorted set whose elements are strictly less than toKey, optionally including toKey. |
Object |
last()
Returns the last (highest) element currently in this sorted set. |
SortedSet |
subSet(Object fromKey,
boolean fromInclusive,
Object toKey,
boolean toInclusive)
Returns a view of the portion of this sorted set whose elements are strictly greater than fromKey and strictly less than toKey, optionally including fromKey and toKey. |
SortedSet |
subSet(Object fromKey,
Object toKey)
Returns a view of the portion of this sorted set whose elements range from fromKey, inclusive, to toKey, exclusive. |
SortedSet |
tailSet(Object fromKey)
Returns a view of the portion of this sorted set whose elements are greater than or equal to fromKey. |
SortedSet |
tailSet(Object fromKey,
boolean fromInclusive)
Returns a view of the portion of this sorted set whose elements are strictly greater than fromKey, optionally including fromKey. |
| Methods inherited from class com.sleepycat.bdb.collection.StoredKeySet |
add, contains, remove |
| Methods inherited from class com.sleepycat.bdb.collection.StoredCollection |
addAll, containsAll, equals, iterator, iterator, join, join, removeAll, retainAll, toArray, toArray, toList, toString |
| Methods inherited from class com.sleepycat.bdb.collection.StoredContainer |
areDuplicatesAllowed, areDuplicatesOrdered, areKeysRenumbered, clear, isAutoCommit, isDirtyReadAllowed, isDirtyReadEnabled, isEmpty, isIndexed, isOrdered, isTransactional, isWriteAllowed, size |
| Methods inherited from class java.lang.Object |
getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Methods inherited from interface java.util.Set |
add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray |
| Constructor Detail |
public StoredSortedKeySet(DataStore store,
DataBinding keyBinding,
boolean writeAllowed)
DataStore.
store - is the DataStore 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 DbException is thrown.
public StoredSortedKeySet(DataIndex index,
DataBinding keyBinding,
boolean writeAllowed)
DataIndex.
index - is the DataIndex 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 DbException is thrown.| Method Detail |
public Comparator comparator()
Comparable interface or not.
This method does not conform to the SortedSet.comparator()
interface.
comparator in interface SortedSetpublic Object first()
SortedSet.first() interface.
first in interface SortedSetRuntimeExceptionWrapper - if a DbException is thrown.public Object last()
SortedSet.last() interface.
last in interface SortedSetRuntimeExceptionWrapper - if a DbException is thrown.public SortedSet headSet(Object toKey)
SortedSet.headSet(java.lang.Object) interface.
headSet in interface SortedSettoKey - is the upper bound.
RuntimeExceptionWrapper - if a DbException is thrown.
public SortedSet headSet(Object toKey,
boolean toInclusive)
SortedSet interface.
toKey - is the upper bound.toInclusive - is true to include toKey.
RuntimeExceptionWrapper - if a DbException is thrown.public SortedSet tailSet(Object fromKey)
SortedSet.tailSet(java.lang.Object) interface.
tailSet in interface SortedSetfromKey - is the lower bound.
RuntimeExceptionWrapper - if a DbException is thrown.
public SortedSet tailSet(Object fromKey,
boolean fromInclusive)
SortedSet interface.
fromKey - is the lower bound.fromInclusive - is true to include fromKey.
RuntimeExceptionWrapper - if a DbException is thrown.
public SortedSet subSet(Object fromKey,
Object toKey)
SortedSet.subSet(java.lang.Object, java.lang.Object) interface.
subSet in interface SortedSetfromKey - is the lower bound.toKey - is the upper bound.
RuntimeExceptionWrapper - if a DbException is thrown.
public SortedSet subSet(Object fromKey,
boolean fromInclusive,
Object toKey,
boolean toInclusive)
SortedSet interface.
fromKey - is the lower bound.fromInclusive - is true to include fromKey.toKey - is the upper bound.toInclusive - is true to include toKey.
RuntimeExceptionWrapper - if a DbException is thrown.
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