ObjectIndexedHeapPriorityQueue (HPPC-RT v0.7.5 API Documentation)

java.lang.Object
- com.carrotsearch.hppcrt.heaps.ObjectIndexedHeapPriorityQueue<KType>

All Implemented Interfaces:

IntObjectAssociativeContainer<KType>, IntObjectMap<KType>, java.lang.Cloneable, java.lang.Iterable<IntObjectCursor<KType>>
```
@Generated(date="2017-07-11T19:16:22+0200",
           value="KTypeIndexedHeapPriorityQueue.java")
public class ObjectIndexedHeapPriorityQueue<KType>
extends java.lang.Object
implements IntObjectMap<KType>, java.lang.Cloneable
```
A Heap-based, indexed min-priority queue of Objects, i.e. top() is the smallest element of the queue. as defined by Sedgewick: Algorithms 4th Edition (2011). This class is also a IntObjectMap, and acts like a (K,V) = (int, Object) map with >= 0 keys. It assures O(log(N)) complexity for insertion, deletion, updating priorities, and constant time to examine the min element by top() and for containsKey(int).
Important: Ordering of elements must be defined either * by Comparable * or by a custom comparator provided in constructors, see comparator() .
Warning : This implementation uses direct indexing, meaning that a map at any given time is only able to have int keys in the [0 ; capacity()[ range. So when a put(int, KType) occurs, the map may be resized to be able hold a key exceeding the current capacity.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`class`	`ObjectIndexedHeapPriorityQueue.EntryIterator` An iterator implementation for `iterator()` entries.
`class`	`ObjectIndexedHeapPriorityQueue.KeysCollection` A view of the keys inside this Indexed heap.
`class`	`ObjectIndexedHeapPriorityQueue.KeysIterator` An iterator over the set of assigned keys.
`class`	`ObjectIndexedHeapPriorityQueue.ValuesCollection` A view over the set of values of this map.
`class`	`ObjectIndexedHeapPriorityQueue.ValuesIterator` An iterator over the set of assigned values.

Field Summary

Fields
Modifier and Type	Field and Description
`java.lang.Object[]`	`buffer` Internal array for storing the priority queue.
`protected java.util.Comparator<? super KType>`	`comparator` Defines the Comparator ordering of the queue, If null, natural ordering is used.
`protected KType`	`defaultValue`
`protected int`	`elementsCount` Number of elements in the queue.
`protected IteratorPool<IntObjectCursor<KType>,ObjectIndexedHeapPriorityQueue.EntryIterator>`	`entryIteratorPool` internal pool of EntryIterator (must be created in constructor)
`int[]`	`pq` Internal array for storing index to buffer position matching i.e for an index i, pq[i] is the position of element in priority queue buffer.
`protected int[]`	`qp` Internal array pq inversing : i.e for a priority buffer position pos, qp[pos] is the index of the value., ie qp[pq\|i]] = i

Constructor Summary

Constructors
Constructor and Description
`ObjectIndexedHeapPriorityQueue()` Default constructor: create with a default numbers of elements (`Containers.DEFAULT_EXPECTED_ELEMENTS`), using the Comparable natural ordering
`ObjectIndexedHeapPriorityQueue(java.util.Comparator<? super KType> comp)` Create with default sizing strategy and initial capacity for storing `Containers.DEFAULT_EXPECTED_ELEMENTS` elements.
`ObjectIndexedHeapPriorityQueue(java.util.Comparator<? super KType> comp, int initialCapacity)` Create with a given initial capacity, using a Comparator for ordering.
`ObjectIndexedHeapPriorityQueue(int initialCapacity)` Create with an initial capacity, using the Comparable natural ordering
`ObjectIndexedHeapPriorityQueue(IntObjectAssociativeContainer<KType> container)` Create a indexed heap from all key-value pairs of another container.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`int`	`capacity()` Return the maximum number of keys this container is guaranteed to hold without reallocating.
`void`	`clear()` Clear all keys and values in the container.
`ObjectIndexedHeapPriorityQueue<KType>`	`clone()` Clone this object.
`java.util.Comparator<? super KType>`	`comparator()` Get the custom comparator used for comparing elements
`boolean`	`containsKey(int key)` Returns `true` if this container has an association to a value for the given key.
`protected void`	`ensureBufferSpace(int index)` Ensures the internal buffer has enough free slots to accommodate the index `index`.
`boolean`	`equals(java.lang.Object obj)` this instance and obj can only be equal if either: (both don't have set comparators) or (both have equal comparators defined by `comparator()`.equals(obj.comparator)) then the indexed heaps are considered equal as IntObjectMap
`<T extends IntObjectPredicate<? super KType>> T`	`forEach(T predicate)` Applies a `predicate` to container elements, as long as the predicate returns `true`.
`<T extends IntObjectProcedure<? super KType>> T`	`forEach(T procedure)` Applies a given procedure to all keys-value pairs in this container.
`static <KType> ObjectIndexedHeapPriorityQueue<KType>`	`from(int[] keys, KType[] values)` Creates a Indexed heap from two index-aligned arrays of key-value pairs.
`static <KType> ObjectIndexedHeapPriorityQueue<KType>`	`from(IntObjectAssociativeContainer<KType> container)` Create a indexed heap from all key-value pairs of another container..
`KType`	`get(int key)` cost: O(1)
`KType`	`getDefaultValue()` Returns the "default value" value used in methods returning "default value"
`int`	`hashCode()`
`boolean`	`isEmpty()`
`ObjectIndexedHeapPriorityQueue.EntryIterator`	`iterator()` Returns a cursor over the entries (key-value pairs) in this map.
`ObjectIndexedHeapPriorityQueue.KeysCollection`	`keys()` Returns a collection view of keys of this container.
`KType`	`popTop()` Retrieve, and remove the top element of the queue, i.e. the min/max element with respect to the comparison criteria (implementation defined) Returns the default value if empty.
`KType`	`put(int key, KType element)` Place a given key and value in the container.
`int`	`putAll(IntObjectAssociativeContainer<? extends KType> container)` Puts all keys from another container to this map, replacing the values of existing keys, if such keys are present.
`int`	`putAll(java.lang.Iterable<? extends IntObjectCursor<? extends KType>> iterable)` Puts all keys from an iterable cursor to this map, replacing the values of existing keys, if such keys are present.
`boolean`	`putIfAbsent(int key, KType value)` Trove-inspired API method.
`KType`	`remove(int key)` Remove the (key, value) pair associated with the given key, and returns the assocaited value.
`int`	`removeAll(IntContainer container)` Removes all keys (and associated values) present in a given container.
`int`	`removeAll(IntObjectPredicate<? super KType> predicate)` Removes all keys (and associated values) for which the predicate on (key, value) pairs returns `true`.
`int`	`removeAll(IntPredicate predicate)` Removes all keys (and associated values) for which the predicate on keys returns `true`.
`void`	`setDefaultValue(KType defaultValue)` Set the "default value" value to be used in methods returning the "default value"
`int`	`size()`
`KType`	`top()` Retrieve, but not remove, the top element of the queue, i.e. the min. element with respect to the comparison criteria of the queue.
`int`	`topKey()` Retrieve the key corresponding to the top element of the queue, i.e. the min element with respect to the comparison criteria of the queue.
`java.lang.String`	`toString()`
`void`	`updatePriorities()` Update priorities of all the elements of the queue, to re-establish the correct priorities towards the comparison criteria. cost: O(n*log(N))
`void`	`updatePriority(int key)` Update the priority of the value associated with key, to re-establish the value correct priority towards the comparison criteria.
`void`	`updateTopPriority()` Update the priority of the `top()` element, to re-establish its actual priority towards the comparison criteria when it may have changed such that it is no longer the min element with respect to the comparison criteria.
`ObjectIndexedHeapPriorityQueue.ValuesCollection`	`values()` Returns a collection view of all values present in this container.

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Field Detail
  - buffer
```
public java.lang.Object[] buffer
```
    Internal array for storing the priority queue.
    Direct indexed priority queue iteration: iterate pq[i] for i in [0; pq.length[ and buffer[pq[i]] to get value where pq[i] > 0
  - pq
```
public int[] pq
```
    Internal array for storing index to buffer position matching i.e for an index i, pq[i] is the position of element in priority queue buffer.
    Direct iteration: iterate pq[i] for indices i in [0; pq.length[ where pq[i] > 0, then buffer[pq[i]] is the value associated with index i.
  - qp
```
protected int[] qp
```
    Internal array pq inversing : i.e for a priority buffer position pos, qp[pos] is the index of the value., ie qp[pq|i]] = i
  - elementsCount
```
protected int elementsCount
```
    Number of elements in the queue.
  - comparator
```
protected java.util.Comparator<? super KType> comparator
```
    Defines the Comparator ordering of the queue, If null, natural ordering is used.
  - defaultValue
```
protected KType defaultValue
```
  - entryIteratorPool
```
protected final IteratorPool<IntObjectCursor<KType>,ObjectIndexedHeapPriorityQueue.EntryIterator> entryIteratorPool
```
    internal pool of EntryIterator (must be created in constructor)
- Constructor Detail
  - ObjectIndexedHeapPriorityQueue
```
public ObjectIndexedHeapPriorityQueue(java.util.Comparator<? super KType> comp,
                                      int initialCapacity)
```
    Create with a given initial capacity, using a Comparator for ordering.
  - ObjectIndexedHeapPriorityQueue
```
public ObjectIndexedHeapPriorityQueue(java.util.Comparator<? super KType> comp)
```
    Create with default sizing strategy and initial capacity for storing Containers.DEFAULT_EXPECTED_ELEMENTS elements.
    
    See Also:
    
    BoundedProportionalArraySizingStrategy
  - ObjectIndexedHeapPriorityQueue
```
public ObjectIndexedHeapPriorityQueue()
```
    Default constructor: create with a default numbers of elements (Containers.DEFAULT_EXPECTED_ELEMENTS), using the Comparable natural ordering
  - ObjectIndexedHeapPriorityQueue
```
public ObjectIndexedHeapPriorityQueue(int initialCapacity)
```
    Create with an initial capacity, using the Comparable natural ordering
  - ObjectIndexedHeapPriorityQueue
```
public ObjectIndexedHeapPriorityQueue(IntObjectAssociativeContainer<KType> container)
```
    Create a indexed heap from all key-value pairs of another container.
- Method Detail
  - from
```
public static <KType> ObjectIndexedHeapPriorityQueue<KType> from(IntObjectAssociativeContainer<KType> container)
```
    Create a indexed heap from all key-value pairs of another container.. (constructor shortcut)
  - from
```
public static <KType> ObjectIndexedHeapPriorityQueue<KType> from(int[] keys,
                                                                 KType[] values)
```
    Creates a Indexed heap from two index-aligned arrays of key-value pairs.
  - clear
```
public void clear()
```
    Clear all keys and values in the container.
    
    Specified by:
    
    clear in interface IntObjectMap<KType>
  - iterator
```
public ObjectIndexedHeapPriorityQueue.EntryIterator iterator()
```
    Returns a cursor over the entries (key-value pairs) in this map. The iterator is implemented as a cursor and it returns the same cursor instance on every call to Iterator.next(). To read the current key and value use the cursor's public fields. An example is shown below.
```
 for (IntShortCursor c : intShortMap)
 {
     System.out.println("index=" + c.index
       + " key=" + c.key
       + " value=" + c.value);
 }
 
```
    The index field inside the cursor gives the internal index inside the container's implementation. The interpretation of this index depends on to the container.
    Specified by:
    
    iterator in interface IntObjectAssociativeContainer<KType>
    
    Specified by:
    
    iterator in interface java.lang.Iterable<IntObjectCursor<KType>>
  - size
```
public int size()
```
    Specified by:
    
    size in interface IntObjectAssociativeContainer<KType>
    
    Returns:
    
    Returns the current size (number of assigned keys) in the container.
  - capacity
```
public int capacity()
```
    Return the maximum number of keys this container is guaranteed to hold without reallocating. The time for calculating the container's capacity may take O(n) time.
    
    Specified by:
    
    capacity in interface IntObjectAssociativeContainer<KType>
  - forEach
```
public <T extends IntObjectProcedure<? super KType>> T forEach(T procedure)
```
    Applies a given procedure to all keys-value pairs in this container. Returns the argument (any subclass of IntObjectProcedure. This lets the caller to call methods of the argument by chaining the call (even if the argument is an anonymous type) to retrieve computed values, for example.
    
    Specified by:
    
    forEach in interface IntObjectAssociativeContainer<KType>
  - forEach
```
public <T extends IntObjectPredicate<? super KType>> T forEach(T predicate)
```
    Applies a predicate to container elements, as long as the predicate returns true. The iteration is interrupted otherwise. Returns the argument (any subclass of IntObjectPredicate. This lets the caller to call methods of the argument by chaining the call (even if the argument is an anonymous type) to retrieve computed values, for example. The iteration is continued as long as the predicate returns true.
    
    Specified by:
    
    forEach in interface IntObjectAssociativeContainer<KType>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface IntObjectAssociativeContainer<KType>
    
    Returns:
    
    Return true if this hash map contains no assigned keys.
  - removeAll
```
public int removeAll(IntContainer container)
```
    Removes all keys (and associated values) present in a given container.
    
    Specified by:
    
    removeAll in interface IntObjectAssociativeContainer<KType>
    
    Returns:
    
    Returns the number of elements actually removed as a result of this call.
  - removeAll
```
public int removeAll(IntPredicate predicate)
```
    Removes all keys (and associated values) for which the predicate on keys returns true.
    
    Specified by:
    
    removeAll in interface IntObjectAssociativeContainer<KType>
    
    Returns:
    
    Returns the number of elements actually removed as a result of this call.
  - removeAll
```
public int removeAll(IntObjectPredicate<? super KType> predicate)
```
    Removes all keys (and associated values) for which the predicate on (key, value) pairs returns true.
    
    Specified by:
    
    removeAll in interface IntObjectAssociativeContainer<KType>
    
    Returns:
    
    Returns the number of elements actually removed as a result of this call.
  - putIfAbsent
```
public boolean putIfAbsent(int key,
                           KType value)
```
    Trove-inspired API method. An equivalent of the following code:
```
 if (!map.containsKey(key))
      map.put(key, value);
 
```
    Specified by:
    
    putIfAbsent in interface IntObjectMap<KType>
    
    Parameters:
    
    key - The key of the value to check.
    
    value - The value to put if key does not exist.
    
    Returns:
    
    true if key did not exist and value was placed in the map.
  - putAll
```
public int putAll(IntObjectAssociativeContainer<? extends KType> container)
```
    Puts all keys from another container to this map, replacing the values of existing keys, if such keys are present.
    
    Specified by:
    
    putAll in interface IntObjectMap<KType>
    
    Returns:
    
    Returns the number of keys added to the map as a result of this call (not previously present in the map). Values of existing keys are overwritten.
  - putAll
```
public int putAll(java.lang.Iterable<? extends IntObjectCursor<? extends KType>> iterable)
```
    Puts all keys from an iterable cursor to this map, replacing the values of existing keys, if such keys are present.
    
    Specified by:
    
    putAll in interface IntObjectMap<KType>
    
    Returns:
    
    Returns the number of keys added to the map as a result of this call (not previously present in the map). Values of existing keys are overwritten.
  - put
```
public KType put(int key,
                 KType element)
```
    Place a given key and value in the container. cost: O(log(N)) for a N sized queue
    Important: Whenever a new (key, value) pair is inserted, or a value is updated with an already present key as specified by the IntObjectMap.put(int, VType) contract, the inserted value priority is always consistent towards the comparison criteria. In other words, there is no need to call updatePriority(int) after a put(int, KType).
    
    Specified by:
    
    put in interface IntObjectMap<KType>
    
    Parameters:
    
    key - the integer key, must be >= 0
    
    element - the associated value
    
    Returns:
    
    Returns the value previously stored under the given key, if an equal key is already in the map and replaces the existing value only with the argument value. If the given key was not already in the map, the given (key, value) pair is inserted in the map and the default value is returned.
  - top
```
public KType top()
```
    Retrieve, but not remove, the top element of the queue, i.e. the min. element with respect to the comparison criteria of the queue. Returns the default value if empty. cost: O(1)
  - topKey
```
public int topKey()
```
    Retrieve the key corresponding to the top element of the queue, i.e. the min element with respect to the comparison criteria of the queue. Returns -1 if empty. cost: O(1)
  - popTop
```
public KType popTop()
```
    Retrieve, and remove the top element of the queue, i.e. the min/max element with respect to the comparison criteria (implementation defined) Returns the default value if empty. cost: O(log(N)) for a N sized queue
  - get
```
public KType get(int key)
```
    cost: O(1)
    
    Specified by:
    
    get in interface IntObjectMap<KType>
    
    Returns:
    
    Returns the value associated with the given key, or the default value if the key is not associated with any value.
  - remove
```
public KType remove(int key)
```
    Remove the (key, value) pair associated with the given key, and returns the assocaited value. The default value is returned if the key did not exist in the map. cost: O(log(N))
    
    Specified by:
    
    remove in interface IntObjectMap<KType>
  - updatePriority
```
public void updatePriority(int key)
```
    Update the priority of the value associated with key, to re-establish the value correct priority towards the comparison criteria. cost: O(log(N))
  - updateTopPriority
```
public void updateTopPriority()
```
    Update the priority of the top() element, to re-establish its actual priority towards the comparison criteria when it may have changed such that it is no longer the min element with respect to the comparison criteria. cost: O(log(N))
  - containsKey
```
public boolean containsKey(int key)
```
    Returns true if this container has an association to a value for the given key. cost: O(1)
    
    Specified by:
    
    containsKey in interface IntObjectAssociativeContainer<KType>
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - equals
```
public boolean equals(java.lang.Object obj)
```
    this instance and obj can only be equal if either:
```
 (both don't have set comparators)
 or
 (both have equal comparators defined by comparator().equals(obj.comparator))
```
    then the indexed heaps are considered equal as IntObjectMap
    are.
    
    Overrides:
    
    equals in class java.lang.Object
    
    clone
    
    public ObjectIndexedHeapPriorityQueue<KType> clone()
    
    Clone this object. The returned clone will use the same comparator.
    
    Overrides:
    
    clone in class java.lang.Object
    
    updatePriorities
    
    public void updatePriorities()
    
    Update priorities of all the elements of the queue, to re-establish the correct priorities towards the comparison criteria. cost: O(n*log(N))
    
    keys
    
    public ObjectIndexedHeapPriorityQueue.KeysCollection keys()
    
    Description copied from interface: IntObjectAssociativeContainer
    
    Returns a collection view of keys of this container. The returned collection is a view over the key set and any modifications (if allowed) introduced to the collection will propagate to the associative container immediately.
    
    Specified by:
    
    keys in interface IntObjectAssociativeContainer<KType>
    
    Returns:
    
    a new KeysCollection view of the keys of this associated container. This view then reflects all changes from the heap.
    
    values
    
    public ObjectIndexedHeapPriorityQueue.ValuesCollection values()
    
    Description copied from interface: IntObjectAssociativeContainer
    
    Returns a collection view of all values present in this container. The returned collection is a view over the value set and any modifications (if allowed) introduced to the collection will propagate to the associative container immediately.
    
    Specified by:
    
    values in interface IntObjectAssociativeContainer<KType>
    
    Returns:
    
    a new ValuesCollection, view of the values of this indexed heap. This view then reflects all changes from the heap.
    
    toString
    
    public java.lang.String toString()
    
    Overrides:
    
    toString in class java.lang.Object
    
    getDefaultValue
    
    public KType getDefaultValue()
    
    Returns the "default value" value used in methods returning "default value"
    
    Specified by:
    
    getDefaultValue in interface IntObjectMap<KType>
    
    setDefaultValue
    
    public void setDefaultValue(KType defaultValue)
    
    Set the "default value" value to be used in methods returning the "default value"
    
    Specified by:
    
    setDefaultValue in interface IntObjectMap<KType>
    
    comparator
    
    public java.util.Comparator<? super KType> comparator()
    
    Get the custom comparator used for comparing elements
    
    Returns:
    
    null if no custom comparator was set, i.e natural ordering of Objects is used instead , which means objects in this case must be Comparable.
    
    ensureBufferSpace
    
    protected void ensureBufferSpace(int index)
    
    Ensures the internal buffer has enough free slots to accommodate the index index. Increases internal buffer size if needed.
    
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Class ObjectIndexedHeapPriorityQueue<KType>

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.lang.Iterable

Field Detail

buffer

pq

qp

elementsCount

comparator

defaultValue

entryIteratorPool

Constructor Detail

ObjectIndexedHeapPriorityQueue

ObjectIndexedHeapPriorityQueue

ObjectIndexedHeapPriorityQueue

ObjectIndexedHeapPriorityQueue

ObjectIndexedHeapPriorityQueue

Method Detail

from

from

clear

iterator

size

capacity

forEach

forEach

isEmpty

removeAll

removeAll

removeAll

putIfAbsent

putAll

putAll

put

top

topKey

popTop

get

remove

updatePriority

updateTopPriority

containsKey

hashCode

equals

clone

updatePriorities

keys

values

toString

getDefaultValue

setDefaultValue

comparator

ensureBufferSpace