Class MapIndex<K,V>

java.lang.Object

com.loomcache.server.query.MapIndex<K,V>

public class MapIndex<K,V>
extends Object

In-memory secondary index on a map column. Supports different index types: SORTED (TreeMap), HASH (HashMap), BITMAP (for low-cardinality).

Constructor Summary

Constructors

Constructor	Description
MapIndex(IndexConfig config)	Creates a new index with the specified configuration.

Method Summary

Modifier and Type	Method	Description
Set<K>	lookup(@Nullable Object value)	Looks up keys that match the exact value.
Set<K>	lookupPrefix(List<?> prefixValues)	Looks up keys matching a leftmost prefix of a composite index.
void	put(K key, @Nullable Object columnValue)	Adds or updates an entry in the index.
Set<K>	rangeQuery(Object from, Object to, boolean includeFrom, boolean includeTo)	Looks up keys in a range (for SORTED indexes only).
void	remove(K key, @Nullable Object columnValue)	Removes an entry from the index.
int	size()	Returns the number of unique indexed values.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MapIndex

public MapIndex(IndexConfig config)

Creates a new index with the specified configuration.

Method Details

put

public void put(K key,
 @Nullable Object columnValue)

Adds or updates an entry in the index. Atomically removes the old index entry if the column value changed.

Parameters:

key - the map key

columnValue - the value of the indexed column

remove

public void remove(K key,
 @Nullable Object columnValue)

Removes an entry from the index. Uses the tracked value rather than relying on the caller.

Parameters:

key - the map key

columnValue - retained for API compatibility; tracked state is authoritative

lookup

public Set<K> lookup(@Nullable Object value)

Looks up keys that match the exact value.

lookupPrefix

public Set<K> lookupPrefix(List<?> prefixValues)

Looks up keys matching a leftmost prefix of a composite index.

rangeQuery

public Set<K> rangeQuery(Object from,
 Object to,
 boolean includeFrom,
 boolean includeTo)

Looks up keys in a range (for SORTED indexes only).

size

public int size()

Returns the number of unique indexed values.