IntToDoubleMap (Lucene 4.3.0 API)

java.lang.Object
- org.apache.lucene.facet.collections.IntToDoubleMap

```
public class IntToDoubleMap
extends Object
```
An Array-based hashtable which maps primitive int to a primitive double.
The hashtable is constracted with a given capacity, or 16 as a default. In case there's not enough room for new pairs, the hashtable grows.
Capacity is adjusted to a power of 2, and there are 2 * capacity entries for the hash. The pre allocated arrays (for keys, values) are at length of capacity + 1, when index 0 is used as 'Ground' or 'NULL'.
The arrays are allocated ahead of hash operations, and form an 'empty space' list, to which the key,value pair is allocated.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields
Modifier and Type Field and Description

static double GROUND

Fields
Modifier and Type	Field and Description
`static double`	`GROUND`

Constructor Summary

Constructors
Constructor and Description

IntToDoubleMap()
Constructs a map with default capacity.

IntToDoubleMap(int capacity)
Constructs a map with given capacity.

Constructors
Constructor and Description
`IntToDoubleMap()` Constructs a map with default capacity.
`IntToDoubleMap(int capacity)` Constructs a map with given capacity.

Method Summary

Methods
Modifier and Type	Method and Description
`protected int`	`calcBaseHashIndex(int key)` Calculating the baseHash index using the internal `hashFactor` .
`void`	`clear()` Empties the map.
`boolean`	`containsKey(int key)` Checks if a given key exists in the map.
`boolean`	`containsValue(double value)` Checks if the given value exists in the map. This method iterates over the collection, trying to find an equal object.
`boolean`	`equals(Object o)`
`protected int`	`find(int key)` Find the actual index of a given key.
`double`	`get(int key)` Returns the value mapped with the given key.
`protected void`	`grow()` Grows the map.
`int`	`hashCode()`
`boolean`	`isEmpty()`
`DoubleIterator`	`iterator()` Returns a new iterator for the mapped double values.
`IntIterator`	`keyIterator()` Returns an iterator on the map keys.
`double`	`put(int key, double v)` Inserts the <key,value> pair into the map.
`double`	`remove(int key)` Removes a <key,value> pair from the map and returns the mapped value, or `Double.NaN` if the none existed.
`int`	`size()`
`double[]`	`toArray()` Translates the mapped pairs' values into an array of Objects
`double[]`	`toArray(double[] a)` Translates the mapped pairs' values into an array of T
`String`	`toString()`

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

- Field Detail
  - GROUND
```
public static final double GROUND
```
    See Also:
    Constant Field Values
- Constructor Detail
  - IntToDoubleMap
```
public IntToDoubleMap()
```
    Constructs a map with default capacity.
  - IntToDoubleMap
```
public IntToDoubleMap(int capacity)
```
    Constructs a map with given capacity. Capacity is adjusted to a native power of 2, with minimum of 16.
    
    Parameters:
    capacity - minimum capacity for the map.
- Method Detail
  - calcBaseHashIndex
```
protected int calcBaseHashIndex(int key)
```
    Calculating the baseHash index using the internal hashFactor .
  - clear
```
public void clear()
```
    Empties the map. Generates the "Empty" space list for later allocation.
  - containsKey
```
public boolean containsKey(int key)
```
    Checks if a given key exists in the map.
    
    Parameters:
    key - that is checked against the map data.
    
    Returns:
    true if the key exists in the map. false otherwise.
  - containsValue
```
public boolean containsValue(double value)
```
    Checks if the given value exists in the map.
    This method iterates over the collection, trying to find an equal object.
    
    Parameters:
    value - double value that is checked against the map data.
    
    Returns:
    true if the value exists in the map, false otherwise.
  - find
```
protected int find(int key)
```
    Find the actual index of a given key.
    
    Returns:
    index of the key. zero if the key wasn't found.
  - get
```
public double get(int key)
```
    Returns the value mapped with the given key.
    
    Parameters:
    key - int who's mapped object we're interested in.
    
    Returns:
    a double value mapped by the given key. Double.NaN if the key wasn't found.
  - grow
```
protected void grow()
```
    Grows the map. Allocates a new map of double the capacity, and fast-insert the old key-value pairs.
  - isEmpty
```
public boolean isEmpty()
```
    Returns:
    true if the map is empty. false otherwise.
  - iterator
```
public DoubleIterator iterator()
```
    Returns a new iterator for the mapped double values.
  - keyIterator
```
public IntIterator keyIterator()
```
    Returns an iterator on the map keys.
  - put
```
public double put(int key,
         double v)
```
    Inserts the <key,value> pair into the map. If the key already exists, this method updates the mapped value to the given one, returning the old mapped value.
    
    Returns:
    the old mapped value, or Double.NaN if the key didn't exist.
  - remove
```
public double remove(int key)
```
    Removes a <key,value> pair from the map and returns the mapped value, or Double.NaN if the none existed.
    
    Parameters:
    key - used to find the value to remove
    
    Returns:
    the removed value or Double.NaN if none existed.
  - size
```
public int size()
```
    Returns:
    number of pairs currently in the map
  - toArray
```
public double[] toArray()
```
    Translates the mapped pairs' values into an array of Objects
    
    Returns:
    a double array of all the values currently in the map.
  - toArray
```
public double[] toArray(double[] a)
```
    Translates the mapped pairs' values into an array of T
    
    Parameters:
    a - the array into which the elements of the list are to be stored. If it is big enough use whatever space we need, setting the one after the true data as Double.NaN.
    
    Returns:
    an array containing the elements of the list, using the given parameter if big enough, otherwise allocate an appropriate array and return it.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object

Class IntToDoubleMap

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

GROUND

Constructor Detail

IntToDoubleMap

IntToDoubleMap

Method Detail

calcBaseHashIndex

clear

containsKey

containsValue

find

get

grow

isEmpty

iterator

keyIterator

put

remove

size

toArray

toArray

toString

hashCode

equals