io.permazen.kv

Class KeyFilterUtil

java.lang.Object

io.permazen.kv.KeyFilterUtil

public final class KeyFilterUtil
extends Object

Utility methods for dealing with KeyFilters.

See Also:

KeyFilter

Method Summary

Modifier and Type	Method and Description
static KeyFilter	intersection(KeyFilter... keyFilters) Create a KeyFilter that represents the intersection of the given instances.
static boolean	isEmpty(KeyFilter keyFilter) Determine if the given instance is empty, i.e., contains no keys.
static KeyFilter	union(KeyFilter... keyFilters) Create a KeyFilter that represents the union of the given instances.

Methods inherited from class java.lang.Object

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

Method Detail

union

public static KeyFilter union(KeyFilter... keyFilters)

Create a KeyFilter that represents the union of the given instances.

Parameters:

keyFilters - instances to unify

Returns:

the union of the given keyFilters

Throws:

IllegalArgumentException - if keyFilters is empty

IllegalArgumentException - if keyFilters or any element in keyFilters is null

intersection

public static KeyFilter intersection(KeyFilter... keyFilters)

Create a KeyFilter that represents the intersection of the given instances.

Parameters:

keyFilters - instances to intersect

Returns:

the intersection of the given keyFilters

Throws:

IllegalArgumentException - if keyFilters is empty

IllegalArgumentException - if keyFilters or any element in keyFilters is null

isEmpty

public static boolean isEmpty(KeyFilter keyFilter)

Determine if the given instance is empty, i.e., contains no keys.

Parameters:

keyFilter - instance to check

Returns:

true if filter is empty

Throws:

IllegalArgumentException - if keyFilter is null