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/*
* Copyright (C) 2003-2014 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;
/** A class providing static methods and objects that do useful things with type-specific priority queues.
*
* @see it.unimi.dsi.fastutil.PriorityQueue
*/
public class PRIORITY_QUEUES {
private PRIORITY_QUEUES() {}
/** A synchronized wrapper class for priority queues. */
public static class SynchronizedPriorityQueue KEY_GENERIC implements PRIORITY_QUEUE KEY_GENERIC {
final protected PRIORITY_QUEUE KEY_GENERIC q;
final protected Object sync;
protected SynchronizedPriorityQueue( final PRIORITY_QUEUE KEY_GENERIC q, final Object sync ) {
this.q = q;
this.sync = sync;
}
protected SynchronizedPriorityQueue( final PRIORITY_QUEUE KEY_GENERIC q ) {
this.q = q;
this.sync = this;
}
public void enqueue( KEY_GENERIC_TYPE x ) { synchronized( sync ) { q.enqueue( x ); } }
public KEY_GENERIC_TYPE DEQUEUE() { synchronized( sync ) { return q.DEQUEUE(); } }
public KEY_GENERIC_TYPE FIRST() { synchronized( sync ) { return q.FIRST(); } }
public KEY_GENERIC_TYPE LAST() { synchronized( sync ) { return q.LAST(); } }
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 KEY_COMPARATOR KEY_SUPER_GENERIC comparator() { synchronized( sync ) { return q.comparator(); } }
#if !#keyclass(Object)
public void enqueue( KEY_CLASS x ) { synchronized( sync ) { q.enqueue( x ); } }
public KEY_CLASS dequeue() { synchronized( sync ) { return q.dequeue(); } }
public KEY_CLASS first() { synchronized( sync ) { return q.first(); } }
public KEY_CLASS last() { synchronized( sync ) { return q.last(); } }
#endif
}
/** 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 KEY_GENERIC PRIORITY_QUEUE KEY_GENERIC synchronize( final PRIORITY_QUEUE KEY_GENERIC 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 KEY_GENERIC PRIORITY_QUEUE KEY_GENERIC synchronize( final PRIORITY_QUEUE KEY_GENERIC q, final Object sync ) { return new SynchronizedPriorityQueue( q, sync ); }
}
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