OpenIntToDoubleHashMap (Apache Commons Math 3.6.1 API)

java.lang.Object
- org.apache.commons.math3.util.OpenIntToDoubleHashMap

All Implemented Interfaces:

Serializable
```
public class OpenIntToDoubleHashMap
extends Object
implements Serializable
```
Open addressed map from int to double.
This class provides a dedicated map from integers to doubles with a much smaller memory overhead than standard java.util.Map.

This class is not synchronized. The specialized iterators returned by iterator() are fail-fast: they throw a ConcurrentModificationException when they detect the map has been modified during iteration.

Since:

2.0

See Also:
Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

class OpenIntToDoubleHashMap.Iterator
Iterator class for the map.

Nested Classes
Modifier and Type	Class and Description
`class`	`OpenIntToDoubleHashMap.Iterator` Iterator class for the map.

Field Summary

Fields
Modifier and Type	Field and Description
`protected static byte`	`FREE` Status indicator for free table entries.
`protected static byte`	`FULL` Status indicator for full table entries.
`protected static byte`	`REMOVED` Status indicator for removed table entries.

Constructor Summary

Constructors
Constructor and Description
`OpenIntToDoubleHashMap()` Build an empty map with default size and using NaN for missing entries.
`OpenIntToDoubleHashMap(double missingEntries)` Build an empty map with default size
`OpenIntToDoubleHashMap(int expectedSize)` Build an empty map with specified size and using NaN for missing entries.
`OpenIntToDoubleHashMap(int expectedSize, double missingEntries)` Build an empty map with specified size.
`OpenIntToDoubleHashMap(OpenIntToDoubleHashMap source)` Copy constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`containsKey(int key)` Check if a value is associated with a key.
`double`	`get(int key)` Get the stored value associated with the given key
`OpenIntToDoubleHashMap.Iterator`	`iterator()` Get an iterator over map elements.
`double`	`put(int key, double value)` Put a value associated with a key in the map.
`double`	`remove(int key)` Remove the value associated with a key.
`int`	`size()` Get the number of elements stored in the map.

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

- Field Detail
  - FREE
```
protected static final byte FREE
```
    Status indicator for free table entries.
    
    See Also:
    Constant Field Values
  - FULL
```
protected static final byte FULL
```
    Status indicator for full table entries.
    
    See Also:
    Constant Field Values
  - REMOVED
```
protected static final byte REMOVED
```
    Status indicator for removed table entries.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - OpenIntToDoubleHashMap
```
public OpenIntToDoubleHashMap()
```
    Build an empty map with default size and using NaN for missing entries.
  - OpenIntToDoubleHashMap
```
public OpenIntToDoubleHashMap(double missingEntries)
```
    Build an empty map with default size
    
    Parameters:
    missingEntries - value to return when a missing entry is fetched
  - OpenIntToDoubleHashMap
```
public OpenIntToDoubleHashMap(int expectedSize)
```
    Build an empty map with specified size and using NaN for missing entries.
    
    Parameters:
    expectedSize - expected number of elements in the map
  - OpenIntToDoubleHashMap
```
public OpenIntToDoubleHashMap(int expectedSize,
                      double missingEntries)
```
    Build an empty map with specified size.
    
    Parameters:
    expectedSize - expected number of elements in the map
    missingEntries - value to return when a missing entry is fetched
  - OpenIntToDoubleHashMap
```
public OpenIntToDoubleHashMap(OpenIntToDoubleHashMap source)
```
    Copy constructor.
    
    Parameters:
    source - map to copy
- Method Detail
  - get
```
public double get(int key)
```
    Get the stored value associated with the given key
    
    Parameters:
    key - key associated with the data
    
    Returns:
    data associated with the key
  - containsKey
```
public boolean containsKey(int key)
```
    Check if a value is associated with a key.
    
    Parameters:
    key - key to check
    
    Returns:
    true if a value is associated with key
  - iterator
```
public OpenIntToDoubleHashMap.Iterator iterator()
```
    Get an iterator over map elements.
    The specialized iterators returned are fail-fast: they throw a ConcurrentModificationException when they detect the map has been modified during iteration.
    
    Returns:
    iterator over the map elements
  - size
```
public int size()
```
    Get the number of elements stored in the map.
    
    Returns:
    number of elements stored in the map
  - remove
```
public double remove(int key)
```
    Remove the value associated with a key.
    
    Parameters:
    key - key to which the value is associated
    
    Returns:
    removed value
  - put
```
public double put(int key,
         double value)
```
    Put a value associated with a key in the map.
    
    Parameters:
    key - key to which value is associated
    value - value to put in the map
    
    Returns:
    previous value associated with the key

Class OpenIntToDoubleHashMap

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

FREE

FULL

REMOVED

Constructor Detail

OpenIntToDoubleHashMap

OpenIntToDoubleHashMap

OpenIntToDoubleHashMap

OpenIntToDoubleHashMap

OpenIntToDoubleHashMap

Method Detail

get

containsKey

iterator

size

remove

put