LongHeapPriorityQueue (fastutil 8.3.1)

java.lang.Object
- it.unimi.dsi.fastutil.longs.LongHeapPriorityQueue

All Implemented Interfaces:

LongPriorityQueue, PriorityQueue<Long>, Serializable
```
public class LongHeapPriorityQueue
extends Object
implements LongPriorityQueue, Serializable
```
A type-specific heap-based priority queue.
Instances of this class represent a priority queue using a heap. The heap is enlarged as needed, but it is never shrunk. Use the trim() method to reduce its size, if necessary.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor and Description
`LongHeapPriorityQueue()` Creates a new empty queue using the natural order.
`LongHeapPriorityQueue(Collection<? extends Long> collection)` Creates a queue using the elements in a collection using the natural order.
`LongHeapPriorityQueue(Collection<? extends Long> collection, LongComparator c)` Creates a queue using the elements in a collection using a given comparator.
`LongHeapPriorityQueue(int capacity)` Creates a new empty queue with a given capacity and using the natural order.
`LongHeapPriorityQueue(int capacity, LongComparator c)` Creates a new empty queue with a given capacity and comparator.
`LongHeapPriorityQueue(long[] a)` Wraps a given array in a queue using the natural order.
`LongHeapPriorityQueue(long[] a, int size)` Wraps a given array in a queue using the natural order.
`LongHeapPriorityQueue(long[] a, int size, LongComparator c)` Wraps a given array in a queue using a given comparator.
`LongHeapPriorityQueue(long[] a, LongComparator c)` Wraps a given array in a queue using a given comparator.
`LongHeapPriorityQueue(LongCollection collection)` Creates a queue using the elements in a type-specific collection using the natural order.
`LongHeapPriorityQueue(LongCollection collection, LongComparator c)` Creates a queue using the elements in a type-specific collection using a given comparator.
`LongHeapPriorityQueue(LongComparator c)` Creates a new empty queue with a given comparator.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`changed()` Notifies the queue that the first element has changed (optional operation).
`void`	`clear()` Removes all elements from this queue.
`LongComparator`	`comparator()` Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.
`long`	`dequeueLong()` Dequeues the first element from the queue.
`void`	`enqueue(long x)` Enqueues a new element.
`long`	`firstLong()` Returns the first element of the queue.
`int`	`size()` Returns the number of elements in this queue.
`void`	`trim()` Trims the underlying heap array so that it has exactly `size()` elements.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.longs.LongPriorityQueue
dequeue, enqueue, first, last, lastLong

Methods inherited from interface it.unimi.dsi.fastutil.PriorityQueue
isEmpty

- Constructor Detail
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(int capacity,
                             LongComparator c)
```
    Creates a new empty queue with a given capacity and comparator.
    
    Parameters:
    
    capacity - the initial capacity of this queue.
    
    c - the comparator used in this queue, or null for the natural order.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(int capacity)
```
    Creates a new empty queue with a given capacity and using the natural order.
    
    Parameters:
    
    capacity - the initial capacity of this queue.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(LongComparator c)
```
    Creates a new empty queue with a given comparator.
    
    Parameters:
    
    c - the comparator used in this queue, or null for the natural order.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue()
```
    Creates a new empty queue using the natural order.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(long[] a,
                             int size,
                             LongComparator c)
```
    Wraps a given array in a queue using a given comparator.
    The queue returned by this method will be backed by the given array. The first size element of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).
    
    Parameters:
    
    a - an array.
    
    size - the number of elements to be included in the queue.
    
    c - the comparator used in this queue, or null for the natural order.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(long[] a,
                             LongComparator c)
```
    Wraps a given array in a queue using a given comparator.
    The queue returned by this method will be backed by the given array. The elements of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).
    
    Parameters:
    
    a - an array.
    
    c - the comparator used in this queue, or null for the natural order.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(long[] a,
                             int size)
```
    Wraps a given array in a queue using the natural order.
    The queue returned by this method will be backed by the given array. The first size element of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).
    
    Parameters:
    
    a - an array.
    
    size - the number of elements to be included in the queue.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(long[] a)
```
    Wraps a given array in a queue using the natural order.
    The queue returned by this method will be backed by the given array. The elements of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).
    
    Parameters:
    
    a - an array.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(LongCollection collection,
                             LongComparator c)
```
    Creates a queue using the elements in a type-specific collection using a given comparator.
    This constructor is more efficient than enqueing the elements of collection one by one.
    
    Parameters:
    
    collection - a collection; its elements will be used to initialize the queue.
    
    c - the comparator used in this queue, or null for the natural order.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(LongCollection collection)
```
    Creates a queue using the elements in a type-specific collection using the natural order.
    This constructor is more efficient than enqueing the elements of collection one by one.
    
    Parameters:
    
    collection - a collection; its elements will be used to initialize the queue.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(Collection<? extends Long> collection,
                             LongComparator c)
```
    Creates a queue using the elements in a collection using a given comparator.
    This constructor is more efficient than enqueing the elements of collection one by one.
    
    Parameters:
    
    collection - a collection; its elements will be used to initialize the queue.
    
    c - the comparator used in this queue, or null for the natural order.
  - LongHeapPriorityQueue
```
public LongHeapPriorityQueue(Collection<? extends Long> collection)
```
    Creates a queue using the elements in a collection using the natural order.
    This constructor is more efficient than enqueing the elements of collection one by one.
    
    Parameters:
    
    collection - a collection; its elements will be used to initialize the queue.
- Method Detail
  - enqueue
```
public void enqueue(long x)
```
    Description copied from interface: LongPriorityQueue
    
    Enqueues a new element.
    
    Specified by:
    
    enqueue in interface LongPriorityQueue
    
    Parameters:
    
    x - the element to enqueue.
    
    See Also:
    
    PriorityQueue.enqueue(Object)
  - dequeueLong
```
public long dequeueLong()
```
    Description copied from interface: LongPriorityQueue
    
    Dequeues the first element from the queue.
    
    Specified by:
    
    dequeueLong in interface LongPriorityQueue
    
    Returns:
    
    the dequeued element.
    
    See Also:
    
    LongPriorityQueue.dequeue()
  - firstLong
```
public long firstLong()
```
    Description copied from interface: LongPriorityQueue
    
    Returns the first element of the queue.
    
    Specified by:
    
    firstLong in interface LongPriorityQueue
    
    Returns:
    
    the first element.
    
    See Also:
    
    LongPriorityQueue.first()
  - changed
```
public void changed()
```
    Description copied from interface: PriorityQueue
    
    Notifies the queue that the first element has changed (optional operation).
    This default implementation just throws an UnsupportedOperationException.
    
    Specified by:
    
    changed in interface PriorityQueue<Long>
  - size
```
public int size()
```
    Description copied from interface: PriorityQueue
    
    Returns the number of elements in this queue.
    
    Specified by:
    
    size in interface PriorityQueue<Long>
    
    Returns:
    
    the number of elements in this queue.
  - clear
```
public void clear()
```
    Description copied from interface: PriorityQueue
    
    Removes all elements from this queue.
    
    Specified by:
    
    clear in interface PriorityQueue<Long>
  - trim
```
public void trim()
```
    Trims the underlying heap array so that it has exactly size() elements.
  - comparator
```
public LongComparator comparator()
```
    Description copied from interface: LongPriorityQueue
    
    Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.
    Note that this specification strengthens the one given in PriorityQueue.comparator().
    
    Specified by:
    
    comparator in interface LongPriorityQueue
    
    Specified by:
    
    comparator in interface PriorityQueue<Long>
    
    Returns:
    
    the comparator associated with this priority queue.
    
    See Also:
    
    PriorityQueue.comparator()

Class LongHeapPriorityQueue

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface it.unimi.dsi.fastutil.longs.LongPriorityQueue

Methods inherited from interface it.unimi.dsi.fastutil.PriorityQueue

Constructor Detail

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

LongHeapPriorityQueue

Method Detail

enqueue

dequeueLong

firstLong

changed

size

clear

trim

comparator