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/*
* Copyright (C) 2003-2014 Paolo Boldi and Sebastiano Vigna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package PACKAGE;
import java.util.NoSuchElementException;
import it.unimi.dsi.fastutil.PriorityQueue;
/** A type-specific {@link PriorityQueue}; provides some additional methods that use polymorphism to avoid (un)boxing.
*
* <P>Additionally, this interface strengthens {@link #comparator()}.
*/
public interface PRIORITY_QUEUE extends PriorityQueue<KEY_CLASS> {
/** Enqueues a new element.
*
* @param x the element to enqueue.
*/
void enqueue( KEY_GENERIC_TYPE x );
/** Dequeues the {@linkplain #first() first} element from the queue.
*
* @return the dequeued element.
* @throws NoSuchElementException if the queue is empty.
*/
KEY_GENERIC_TYPE DEQUEUE();
/** Returns the first element of the queue.
*
* @return the first element.
* @throws NoSuchElementException if the queue is empty.
*/
KEY_GENERIC_TYPE FIRST();
/** Returns the last element of the queue, that is, the element the would be dequeued last (optional operation).
*
* @return the last element.
* @throws NoSuchElementException if the queue is empty.
*/
KEY_GENERIC_TYPE LAST();
/** Returns the comparator associated with this sorted set, or null if it uses its elements' natural ordering.
*
* <P>Note that this specification strengthens the one given in {@link PriorityQueue#comparator()}.
*
* @see PriorityQueue#comparator()
*/
KEY_COMPARATOR comparator();
}
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