maedhroz commented on code in PR #4353:
URL: https://github.com/apache/cassandra/pull/4353#discussion_r2670375770
##########
src/java/org/apache/cassandra/utils/CloseableIterator.java:
##########
@@ -17,14 +17,29 @@
*/
package org.apache.cassandra.utils;
+import java.io.Closeable;
+import java.util.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;
+import org.apache.cassandra.io.util.FileUtils;
+
// so we can instantiate anonymous classes implementing both interfaces
public interface CloseableIterator<T> extends Iterator<T>, AutoCloseable
{
public void close();
+ CloseableIterator<Object> EMPTY =
CloseableIterator.wrap(Collections.emptyIterator());
+
+ /**
+ * Returns an empty {@link CloseableIterator}.
+ */
+ @SuppressWarnings("unchecked")
+ static <T> CloseableIterator<T> emptyIterator()
+ {
+ return (CloseableIterator<T>) EMPTY;
+ }
Review Comment:
Is this functionally equivalent to `empty()` below...just optimized to avoid
creating a new instance of `CloseableIterator`?
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