/*
	* Copyright (C) 2003-2019 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 it.unimi.dsi.fastutil.chars;
A class providing static methods and objects that do useful things with
type-specific priority queues.
See Also:
PriorityQueue/**
 * A class providing static methods and objects that do useful things with
 * type-specific priority queues.
 *
 * @see it.unimi.dsi.fastutil.PriorityQueue
 */
public final class CharPriorityQueues {
	private CharPriorityQueues() {
	}
	
A synchronized wrapper class for priority queues. /** A synchronized wrapper class for priority queues. */
	public static class SynchronizedPriorityQueue implements CharPriorityQueue {
		protected final CharPriorityQueue q;
		protected final Object sync;
		protected SynchronizedPriorityQueue(final CharPriorityQueue q, final Object sync) {
			this.q = q;
			this.sync = sync;
		}
		protected SynchronizedPriorityQueue(final CharPriorityQueue q) {
			this.q = q;
			this.sync = this;
		}
		@Override
		public void enqueue(char x) {
			synchronized (sync) {
				q.enqueue(x);
			}
		}
		@Override
		public char dequeueChar() {
			synchronized (sync) {
				return q.dequeueChar();
			}
		}
		@Override
		public char firstChar() {
			synchronized (sync) {
				return q.firstChar();
			}
		}
		@Override
		public char lastChar() {
			synchronized (sync) {
				return q.lastChar();
			}
		}
		@Override
		public boolean isEmpty() {
			synchronized (sync) {
				return q.isEmpty();
			}
		}
		@Override
		public int size() {
			synchronized (sync) {
				return q.size();
			}
		}
		@Override
		public void clear() {
			synchronized (sync) {
				q.clear();
			}
		}
		@Override
		public void changed() {
			synchronized (sync) {
				q.changed();
			}
		}
		@Override
		public CharComparator comparator() {
			synchronized (sync) {
				return q.comparator();
			}
		}
		@Deprecated
		@Override
		public void enqueue(Character x) {
			synchronized (sync) {
				q.enqueue(x);
			}
		}
		@Deprecated
		@Override
		public Character dequeue() {
			synchronized (sync) {
				return q.dequeue();
			}
		}
		@Deprecated
		@Override
		public Character first() {
			synchronized (sync) {
				return q.first();
			}
		}
		@Deprecated
		@Override
		public Character last() {
			synchronized (sync) {
				return q.last();
			}
		}
		@Override
		public int hashCode() {
			synchronized (sync) {
				return q.hashCode();
			}
		}
		@Override
		public boolean equals(final Object o) {
			if (o == this)
				return true;
			synchronized (sync) {
				return q.equals(o);
			}
		}
		private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException {
			synchronized (sync) {
				s.defaultWriteObject();
			}
		}
	}
	
Returns a synchronized type-specific priority queue backed by the specified
type-specific priority queue.
Params:
q – 
           the priority queue to be wrapped in a synchronized priority queue.
Returns:
a synchronized view of the specified priority queue./**
	 * Returns a synchronized type-specific priority queue backed by the specified
	 * type-specific priority queue.
	 *
	 * @param q
	 *            the priority queue to be wrapped in a synchronized priority queue.
	 * @return a synchronized view of the specified priority queue.
	 */
	public static CharPriorityQueue synchronize(final CharPriorityQueue q) {
		return new SynchronizedPriorityQueue(q);
	}
	
Returns a synchronized type-specific priority queue backed by the specified
type-specific priority queue, using an assigned object to synchronize.
Params:
q – 
           the priority queue to be wrapped in a synchronized priority queue.
sync – 
           an object that will be used to synchronize the access to the
           priority queue.
Returns:
a synchronized view of the specified priority queue./**
	 * Returns a synchronized type-specific priority queue backed by the specified
	 * type-specific priority queue, using an assigned object to synchronize.
	 *
	 * @param q
	 *            the priority queue to be wrapped in a synchronized priority queue.
	 * @param sync
	 *            an object that will be used to synchronize the access to the
	 *            priority queue.
	 * @return a synchronized view of the specified priority queue.
	 */
	public static CharPriorityQueue synchronize(final CharPriorityQueue q, final Object sync) {
		return new SynchronizedPriorityQueue(q, sync);
	}
}