org.apache.commons.math3.util

Class OpenIntToDoubleHashMap

java.lang.Object

org.apache.commons.math3.util.OpenIntToDoubleHashMap

All Implemented Interfaces:

java.io.Serializable

public class OpenIntToDoubleHashMap
extends java.lang.Object
implements java.io.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.

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

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

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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