public KeySnapshot filter ( KVFilter kvf ) { ArrayList < KeyInfo > res = new ArrayList <> ( ) ; for ( KeyInfo kinfo : _keyInfos ) if ( kvf . filter ( kinfo ) ) res . add ( kinfo ) ; return new KeySnapshot ( res . toArray ( new KeyInfo [ res . size ( ) ] ) ) ; }
Filter the snapshot providing custom filter . Only the keys for which filter returns true will be present in the new snapshot .