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/*
* Copyright (C) 2003-2024 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 final class PRIORITY_QUEUES {
private PRIORITY_QUEUES() {}
/** A synchronized wrapper class for priority queues. */
public static class SynchronizedPriorityQueue KEY_GENERIC implements PRIORITY_QUEUE KEY_GENERIC {
protected final PRIORITY_QUEUE KEY_GENERIC q;
protected final 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;
}
@Override
public void enqueue(KEY_GENERIC_TYPE x) { synchronized(sync) { q.enqueue(x); } }
@Override
public KEY_GENERIC_TYPE DEQUEUE() { synchronized(sync) { return q.DEQUEUE(); } }
@Override
public KEY_GENERIC_TYPE FIRST() { synchronized(sync) { return q.FIRST(); } }
@Override
public KEY_GENERIC_TYPE LAST() { synchronized(sync) { return q.LAST(); } }
@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 KEY_COMPARATOR KEY_SUPER_GENERIC comparator() { synchronized(sync) { return q.comparator(); } }
#if KEYS_PRIMITIVE
@Deprecated
@Override
public void enqueue(KEY_CLASS x) { synchronized(sync) { q.enqueue(x); } }
@Deprecated
@Override
public KEY_CLASS dequeue() { synchronized(sync) { return q.dequeue(); } }
@Deprecated
@Override
public KEY_CLASS first() { synchronized(sync) { return q.first(); } }
@Deprecated
@Override
public KEY_CLASS last() { synchronized(sync) { return q.last(); } }
#endif
@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.
*
* @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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