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This artifact provides efficient implementations for various collection data structures (esp. linked lists and priority queues), which have very insufficient implementation in the Java Collections Framework that makes it hard or even impossible to exploit their efficiencies.

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/* Copyright (C) 2013-2019 TU Dortmund
 * This file is part of AutomataLib, http://www.automatalib.net/.
 *
 * 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 net.automatalib.commons.smartcollections;

/**
 * Priority queue interface. Note that this class deliberately does not specify whether the inserted elements come with
 * their own key (i.e. implement {@link Comparable} or can be compared using a comparator), or have external keys
 * attached.
 *
 * @param 
 *         element class
 *
 * @author Malte Isberner
 */
public interface SmartPriorityQueue extends SmartCollection {

    /**
     * Retrieves, but does not remove the element with the minimum key in the priority queue. If there are several
     * elements with minimal key values, one of them is chosen arbitrarily.
     *
     * @return an element with a minimal key.
     */
    E peekMin();

    /**
     * Retrieves and remove the element with the minimum key in the priority queue. If there are several elements with
     * minimal key values, one of them is chosen arbitrarily.
     *
     * @return the element with the previously minimal key.
     */
    E extractMin();

}