*/
package org.opendaylight.controller.cluster.access.client;
+import com.google.common.annotations.Beta;
import java.util.AbstractQueue;
import java.util.Collections;
import java.util.Iterator;
import java.util.Queue;
+import org.opendaylight.yangtools.concepts.Immutable;
/**
* A specialized always-empty implementation of {@link java.util.Queue}. This implementation will always refuse new
* elements in its {@link #offer(Object)} method.
-
* @author Robert Varga
*
* @param <E> the type of elements held in this collection
*/
// TODO: move this class into yangtools.util
-final class EmptyQueue<T> extends AbstractQueue<T> {
+@Beta
+public final class EmptyQueue<E> extends AbstractQueue<E> implements Immutable {
private static final EmptyQueue<?> INSTANCE = new EmptyQueue<>();
private EmptyQueue() {
}
@SuppressWarnings("unchecked")
- static <T> Queue<T> getInstance() {
+ public static <T> Queue<T> getInstance() {
return (Queue<T>) INSTANCE;
}
@Override
- public boolean offer(final T e) {
+ public boolean offer(final E entry) {
return false;
}
@Override
- public T poll() {
+ public E poll() {
return null;
}
@Override
- public T peek() {
+ public E peek() {
return null;
}
@Override
- public Iterator<T> iterator() {
+ public Iterator<E> iterator() {
return Collections.emptyIterator();
}
public int size() {
return 0;
}
-}
\ No newline at end of file
+}