java.lang.Object
- org.apache.lucene.internal.hppc.IntDoubleHashMap

All Implemented Interfaces:

Cloneable, Iterable<IntDoubleHashMap.IntDoubleCursor>, Accountable
```
public class IntDoubleHashMap
extends Object
implements Iterable<IntDoubleHashMap.IntDoubleCursor>, Accountable, Cloneable
```
A hash map of int to double, implemented using open addressing with linear probing for collision resolution.
Mostly forked and trimmed from com.carrotsearch.hppc.IntDoubleHashMap
github: https://github.com/carrotsearch/hppc release 0.10.0

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`IntDoubleHashMap.IntDoubleCursor`	Forked from HPPC, holding int index,key and value
`class`	`IntDoubleHashMap.KeysContainer`	A view of the keys inside this hash map.
`class`	`IntDoubleHashMap.ValuesContainer`	A view over the set of values of this map.

Field Summary

Fields
Modifier and Type	Field	Description
`protected int`	`assigned`	The number of stored keys (assigned key slots), excluding the special "empty" key, if any (use `size()` instead).
`protected boolean`	`hasEmptyKey`	Special treatment for the "empty slot" key marker.
`protected int`	`iterationSeed`	Seed used to ensure the hash iteration order is different from an iteration to another.
`int[]`	`keys`	The array holding keys.
`protected double`	`loadFactor`	The load factor for `keys`.
`protected int`	`mask`	Mask for slot scans in `keys`.
`protected int`	`resizeAt`	Expand (rehash) `keys` when `assigned` hits this value.
`double[]`	`values`	The array holding values.

Fields inherited from interface org.apache.lucene.util.Accountable
NULL_ACCOUNTABLE

Constructor Summary

Constructors
Constructor	Description
`IntDoubleHashMap()`	New instance with sane defaults.
`IntDoubleHashMap(int expectedElements)`	New instance with sane defaults.
`IntDoubleHashMap(int expectedElements, double loadFactor)`	New instance with the provided defaults.
`IntDoubleHashMap(IntDoubleHashMap map)`	Create a hash map from all key-value pairs of another map.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`addTo(int key, double incrementValue)`	Adds `incrementValue` to any existing value for the given `key` or inserts `incrementValue` if `key` did not previously exist.
`protected void`	`allocateBuffers(int arraySize)`	Allocate new internal buffers.
`protected void`	`allocateThenInsertThenRehash(int slot, int pendingKey, double pendingValue)`	This method is invoked when there is a new key/ value pair to be inserted into the buffers but there is not enough empty slots to do so.
`void`	`clear()`
`IntDoubleHashMap`	`clone()`
`boolean`	`containsKey(int key)`
`void`	`ensureCapacity(int expectedElements)`	Ensure this container can hold at least the given number of keys (entries) without resizing its buffers.
`protected boolean`	`equalElements(IntDoubleHashMap other)`	Return true if all keys of some other container exist in this container.
`boolean`	`equals(Object obj)`
`static IntDoubleHashMap`	`from(int[] keys, double[] values)`	Creates a hash map from two index-aligned arrays of key-value pairs.
`double`	`get(int key)`
`double`	`getOrDefault(int key, double defaultValue)`
`int`	`hashCode()`
`protected int`	`hashKey(int key)`	Returns a hash code for the given key.
`boolean`	`indexExists(int index)`
`double`	`indexGet(int index)`
`void`	`indexInsert(int index, int key, double value)`
`int`	`indexOf(int key)`
`double`	`indexRemove(int index)`
`double`	`indexReplace(int index, double newValue)`
`boolean`	`isEmpty()`
`Iterator<IntDoubleHashMap.IntDoubleCursor>`	`iterator()`
`IntDoubleHashMap.KeysContainer`	`keys()`	Returns a specialized view of the keys of this associated container.
`protected int`	`nextIterationSeed()`	Provides the next iteration seed used to build the iteration starting slot and offset increment.
`double`	`put(int key, double value)`
`int`	`putAll(Iterable<? extends IntDoubleHashMap.IntDoubleCursor> iterable)`
`boolean`	`putIfAbsent(int key, double value)`	Trove-inspired API method.
`double`	`putOrAdd(int key, double putValue, double incrementValue)`	If `key` exists, `putValue` is inserted into the map, otherwise any existing value is incremented by `additionValue`.
`long`	`ramBytesUsed()`	Return the memory usage of this object in bytes.
`protected void`	`rehash(int[] fromKeys, double[] fromValues)`	Rehash from old buffers to new buffers.
`void`	`release()`
`double`	`remove(int key)`
`protected void`	`shiftConflictingKeys(int gapSlot)`	Shift all the slot-conflicting keys and values allocated to (and including) `slot`.
`int`	`size()`
`String`	`toString()`	Convert the contents of this map to a human-friendly string.
`IntDoubleHashMap.ValuesContainer`	`values()`
`protected double`	`verifyLoadFactor(double loadFactor)`	Validate load factor range and return it.

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

Methods inherited from interface org.apache.lucene.util.Accountable
getChildResources

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

- Field Detail
  - keys
```
public int[] keys
```
    The array holding keys.
  - values
```
public double[] values
```
    The array holding values.
  - assigned
```
protected int assigned
```
    The number of stored keys (assigned key slots), excluding the special "empty" key, if any (use size() instead).
    
    See Also:
    
    size()
  - mask
```
protected int mask
```
    Mask for slot scans in keys.
  - resizeAt
```
protected int resizeAt
```
    Expand (rehash) keys when assigned hits this value.
  - hasEmptyKey
```
protected boolean hasEmptyKey
```
    Special treatment for the "empty slot" key marker.
  - loadFactor
```
protected double loadFactor
```
    The load factor for keys.
  - iterationSeed
```
protected int iterationSeed
```
    Seed used to ensure the hash iteration order is different from an iteration to another.
- Constructor Detail
  - IntDoubleHashMap
```
public IntDoubleHashMap()
```
    New instance with sane defaults.
  - IntDoubleHashMap
```
public IntDoubleHashMap(int expectedElements)
```
    New instance with sane defaults.
    
    Parameters:
    
    expectedElements - The expected number of elements guaranteed not to cause buffer expansion (inclusive).
  - IntDoubleHashMap
```
public IntDoubleHashMap(int expectedElements,
                        double loadFactor)
```
    New instance with the provided defaults.
    
    Parameters:
    
    expectedElements - The expected number of elements guaranteed not to cause a rehash (inclusive).
    
    loadFactor - The load factor for internal buffers. Insane load factors (zero, full capacity) are rejected by verifyLoadFactor(double).
  - IntDoubleHashMap
```
public IntDoubleHashMap(IntDoubleHashMap map)
```
    Create a hash map from all key-value pairs of another map.
- Method Detail
  - put
```
public double put(int key,
                  double value)
```
  - putAll
```
public int putAll(Iterable<? extends IntDoubleHashMap.IntDoubleCursor> iterable)
```
  - putIfAbsent
```
public boolean putIfAbsent(int key,
                           double value)
```
    Trove-inspired API method. An equivalent of the following code:
    if (!map.containsKey(key)) map.put(value);
    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.
  - putOrAdd
```
public double putOrAdd(int key,
                       double putValue,
                       double incrementValue)
```
    If key exists, putValue is inserted into the map, otherwise any existing value is incremented by additionValue.
    
    Parameters:
    
    key - The key of the value to adjust.
    
    putValue - The value to put if key does not exist.
    
    incrementValue - The value to add to the existing value if key exists.
    
    Returns:
    
    Returns the current value associated with key (after changes).
  - addTo
```
public double addTo(int key,
                    double incrementValue)
```
    Adds incrementValue to any existing value for the given key or inserts incrementValue if key did not previously exist.
    
    Parameters:
    
    key - The key of the value to adjust.
    
    incrementValue - The value to put or add to the existing value if key exists.
    
    Returns:
    
    Returns the current value associated with key (after changes).
  - remove
```
public double remove(int key)
```
  - get
```
public double get(int key)
```
  - getOrDefault
```
public double getOrDefault(int key,
                           double defaultValue)
```
  - containsKey
```
public boolean containsKey(int key)
```
  - indexOf
```
public int indexOf(int key)
```
  - indexExists
```
public boolean indexExists(int index)
```
  - indexGet
```
public double indexGet(int index)
```
  - indexReplace
```
public double indexReplace(int index,
                           double newValue)
```
  - indexInsert
```
public void indexInsert(int index,
                        int key,
                        double value)
```
  - indexRemove
```
public double indexRemove(int index)
```
  - clear
```
public void clear()
```
  - release
```
public void release()
```
  - size
```
public int size()
```
  - isEmpty
```
public boolean isEmpty()
```
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - equalElements
```
protected boolean equalElements(IntDoubleHashMap other)
```
    Return true if all keys of some other container exist in this container.
  - ensureCapacity
```
public void ensureCapacity(int expectedElements)
```
    Ensure this container can hold at least the given number of keys (entries) without resizing its buffers.
    
    Parameters:
    
    expectedElements - The total number of keys, inclusive.
  - nextIterationSeed
```
protected int nextIterationSeed()
```
    Provides the next iteration seed used to build the iteration starting slot and offset increment. This method does not need to be synchronized, what matters is that each thread gets a sequence of varying seeds.
  - ramBytesUsed
```
public long ramBytesUsed()
```
    Description copied from interface: Accountable
    
    Return the memory usage of this object in bytes. Negative values are illegal.
    
    Specified by:
    
    ramBytesUsed in interface Accountable
  - iterator
```
public Iterator<IntDoubleHashMap.IntDoubleCursor> iterator()
```
    Specified by:
    
    iterator in interface Iterable<IntDoubleHashMap.IntDoubleCursor>
  - keys
```
public IntDoubleHashMap.KeysContainer keys()
```
    Returns a specialized view of the keys of this associated container.
  - values
```
public IntDoubleHashMap.ValuesContainer values()
```
    Returns:
    
    Returns a container with all values stored in this map.
  - clone
```
public IntDoubleHashMap clone()
```
    Overrides:
    
    clone in class Object
  - toString
```
public String toString()
```
    Convert the contents of this map to a human-friendly string.
    
    Overrides:
    
    toString in class Object
  - from
```
public static IntDoubleHashMap from(int[] keys,
                                    double[] values)
```
    Creates a hash map from two index-aligned arrays of key-value pairs.
  - hashKey
```
protected int hashKey(int key)
```
    Returns a hash code for the given key.
    The output from this function should evenly distribute keys across the entire integer range.
  - verifyLoadFactor
```
protected double verifyLoadFactor(double loadFactor)
```
    Validate load factor range and return it. Override and suppress if you need insane load factors.
  - rehash
```
protected void rehash(int[] fromKeys,
                      double[] fromValues)
```
    Rehash from old buffers to new buffers.
  - allocateBuffers
```
protected void allocateBuffers(int arraySize)
```
    Allocate new internal buffers. This method attempts to allocate and assign internal buffers atomically (either allocations succeed or not).
  - allocateThenInsertThenRehash
```
protected void allocateThenInsertThenRehash(int slot,
                                            int pendingKey,
                                            double pendingValue)
```
    This method is invoked when there is a new key/ value pair to be inserted into the buffers but there is not enough empty slots to do so.
    New buffers are allocated. If this succeeds, we know we can proceed with rehashing so we assign the pending element to the previous buffer (possibly violating the invariant of having at least one empty slot) and rehash all keys, substituting new buffers at the end.
  - shiftConflictingKeys
```
protected void shiftConflictingKeys(int gapSlot)
```
    Shift all the slot-conflicting keys and values allocated to (and including) slot.

Class IntDoubleHashMap

Nested Class Summary

Field Summary

Fields inherited from interface org.apache.lucene.util.Accountable

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.apache.lucene.util.Accountable

Methods inherited from interface java.lang.Iterable

Field Detail

keys

values

assigned

mask

resizeAt

hasEmptyKey

loadFactor

iterationSeed

Constructor Detail

IntDoubleHashMap

IntDoubleHashMap

IntDoubleHashMap

IntDoubleHashMap

Method Detail

put

putAll

putIfAbsent

putOrAdd

addTo

remove

get

getOrDefault

containsKey

indexOf

indexExists

indexGet

indexReplace

indexInsert

indexRemove

clear

release

size

isEmpty

hashCode

equals

equalElements

ensureCapacity

nextIterationSeed

ramBytesUsed

iterator

keys

values

clone

toString

from

hashKey

verifyLoadFactor

rehash

allocateBuffers

allocateThenInsertThenRehash

shiftConflictingKeys