com.orientechnologies.orient.core.index

Interface OIndexCursor

All Superinterfaces:

Iterator<OIdentifiable>

All Known Implementing Classes:

OCompositeIndexCursor, OIndexAbstractCursor, OIndexChangesWrapper, OIndexCursorCollectionValue, OIndexCursorSingleValue, OLuceneIndexCursor

public interface OIndexCursor
extends Iterator<OIdentifiable>

Presentation of OrientDB index cursor for point and range queries. Cursor may iterate by several elements even if you do point query (query by single key). It is possible if you use not unique index. Contract of cursor is simple it iterates in some subset of index data till it reaches it's borders in such case nextEntry() returns null. Cursor is created as result of index query method such as OIndex.iterateEntriesBetween(Object, boolean, Object, boolean, boolean) cursor instance cannot be used at several threads simultaneously.

Since:

4/4/14

Author:

Andrey Lomakin (a.lomakin-at-orientdb.com)

Method Summary

Modifier and Type	Method and Description
Map.Entry<Object,OIdentifiable>	nextEntry() Returns nextEntry element in subset of index data which should be iterated by given cursor.
void	setPrefetchSize(int prefetchSize) Set number of records to fetch for the next call to next() or nextEntry().
Set<Map.Entry<Object,OIdentifiable>>	toEntries() Accumulates and returns all entries of index inside of data subset of cursor.
Set<Object>	toKeys() Accumulates and returns all keys of index inside of data subset of cursor.
Set<OIdentifiable>	toValues() Accumulates and returns all values of index inside of data subset of cursor.

Methods inherited from interface java.util.Iterator

forEachRemaining, hasNext, next, remove

Method Detail

nextEntry

Map.Entry<Object,OIdentifiable> nextEntry()

Returns nextEntry element in subset of index data which should be iterated by given cursor.

Returns:

nextEntry element in subset of index data which should be iterated by given cursor or null if all data are iterated.

toValues

Set<OIdentifiable> toValues()

Accumulates and returns all values of index inside of data subset of cursor.

Returns:

all values of index inside of data subset of cursor.

toEntries

Set<Map.Entry<Object,OIdentifiable>> toEntries()

Accumulates and returns all entries of index inside of data subset of cursor.

Returns:

all entries of index inside of data subset of cursor.

toKeys

Set<Object> toKeys()

Accumulates and returns all keys of index inside of data subset of cursor.

Returns:

all keys of index inside of data subset of cursor.

setPrefetchSize

void setPrefetchSize(int prefetchSize)

Set number of records to fetch for the next call to next() or nextEntry().

Parameters:

prefetchSize - Number of records to prefetch. -1 = prefetch using default settings.