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/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*		 
 * Copyright (C) 2003-2015 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.longs;

/** A class providing static methods and objects that do useful things with type-specific priority queues.
 *
 * @see it.unimi.dsi.fastutil.PriorityQueue */
public class LongPriorityQueues {
	private LongPriorityQueues() {}

	/** A synchronized wrapper class for priority queues. */
	public static class SynchronizedPriorityQueue implements LongPriorityQueue {
		final protected LongPriorityQueue q;
		final protected Object sync;

		protected SynchronizedPriorityQueue( final LongPriorityQueue q, final Object sync ) {
			this.q = q;
			this.sync = sync;
		}

		protected SynchronizedPriorityQueue( final LongPriorityQueue q ) {
			this.q = q;
			this.sync = this;
		}

		public void enqueue( long x ) {
			synchronized ( sync ) {
				q.enqueue( x );
			}
		}

		public long dequeueLong() {
			synchronized ( sync ) {
				return q.dequeueLong();
			}
		}

		public long firstLong() {
			synchronized ( sync ) {
				return q.firstLong();
			}
		}

		public long lastLong() {
			synchronized ( sync ) {
				return q.lastLong();
			}
		}

		public boolean isEmpty() {
			synchronized ( sync ) {
				return q.isEmpty();
			}
		}

		public int size() {
			synchronized ( sync ) {
				return q.size();
			}
		}

		public void clear() {
			synchronized ( sync ) {
				q.clear();
			}
		}

		public void changed() {
			synchronized ( sync ) {
				q.changed();
			}
		}

		public LongComparator comparator() {
			synchronized ( sync ) {
				return q.comparator();
			}
		}

		public void enqueue( Long x ) {
			synchronized ( sync ) {
				q.enqueue( x );
			}
		}

		public Long dequeue() {
			synchronized ( sync ) {
				return q.dequeue();
			}
		}

		public Long first() {
			synchronized ( sync ) {
				return q.first();
			}
		}

		public Long last() {
			synchronized ( sync ) {
				return q.last();
			}
		}
	}

	/** 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 LongPriorityQueue synchronize( final LongPriorityQueue 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.
	 *
	 * @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 LongPriorityQueue synchronize( final LongPriorityQueue q, final Object sync ) {
		return new SynchronizedPriorityQueue( q, sync );
	}
}