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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.
/*
* Copyright (C) 2003-2023 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.floats;
/**
* 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 FloatPriorityQueues {
private FloatPriorityQueues() {
}
/** A synchronized wrapper class for priority queues. */
public static class SynchronizedPriorityQueue implements FloatPriorityQueue {
protected final FloatPriorityQueue q;
protected final Object sync;
protected SynchronizedPriorityQueue(final FloatPriorityQueue q, final Object sync) {
this.q = q;
this.sync = sync;
}
protected SynchronizedPriorityQueue(final FloatPriorityQueue q) {
this.q = q;
this.sync = this;
}
@Override
public void enqueue(float x) {
synchronized (sync) {
q.enqueue(x);
}
}
@Override
public float dequeueFloat() {
synchronized (sync) {
return q.dequeueFloat();
}
}
@Override
public float firstFloat() {
synchronized (sync) {
return q.firstFloat();
}
}
@Override
public float lastFloat() {
synchronized (sync) {
return q.lastFloat();
}
}
@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 FloatComparator comparator() {
synchronized (sync) {
return q.comparator();
}
}
@Deprecated
@Override
public void enqueue(Float x) {
synchronized (sync) {
q.enqueue(x);
}
}
@Deprecated
@Override
public Float dequeue() {
synchronized (sync) {
return q.dequeue();
}
}
@Deprecated
@Override
public Float first() {
synchronized (sync) {
return q.first();
}
}
@Deprecated
@Override
public Float 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.
*
* @param q the priority queue to be wrapped in a synchronized priority queue.
* @return a synchronized view of the specified priority queue.
*/
public static FloatPriorityQueue synchronize(final FloatPriorityQueue 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 FloatPriorityQueue synchronize(final FloatPriorityQueue q, final Object sync) {
return new SynchronizedPriorityQueue(q, sync);
}
}