org.apache.commons.math3.util

Class OpenIntToFieldHashMap<T extends FieldElement<T>>

java.lang.Object

org.apache.commons.math3.util.OpenIntToFieldHashMap<T>

Type Parameters:

T - the type of the field elements

All Implemented Interfaces:

Serializable

public class OpenIntToFieldHashMap<T extends FieldElement<T>>
extends Object
implements Serializable

Open addressed map from int to FieldElement.

This class provides a dedicated map from integers to FieldElements 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

Version:

$Id: OpenIntToFieldHashMap.java 1244107 2012-02-14 16:17:55Z erans $

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	OpenIntToFieldHashMap.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
OpenIntToFieldHashMap(Field<T> field) Build an empty map with default size and using zero for missing entries.
OpenIntToFieldHashMap(Field<T> field, int expectedSize) Build an empty map with specified size and using zero for missing entries.
OpenIntToFieldHashMap(Field<T> field, int expectedSize, T missingEntries) Build an empty map with specified size.
OpenIntToFieldHashMap(Field<T> field, T missingEntries) Build an empty map with default size
OpenIntToFieldHashMap(OpenIntToFieldHashMap<T> 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.
T	get(int key) Get the stored value associated with the given key
OpenIntToFieldHashMap.Iterator	iterator() Get an iterator over map elements.
T	put(int key, T value) Put a value associated with a key in the map.
T	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

OpenIntToFieldHashMap

public OpenIntToFieldHashMap(Field<T> field)

Build an empty map with default size and using zero for missing entries.

Parameters:

field - field to which the elements belong

OpenIntToFieldHashMap

public OpenIntToFieldHashMap(Field<T> field,
                     T missingEntries)

Build an empty map with default size

Parameters:

field - field to which the elements belong

missingEntries - value to return when a missing entry is fetched

OpenIntToFieldHashMap

public OpenIntToFieldHashMap(Field<T> field,
                     int expectedSize)

Build an empty map with specified size and using zero for missing entries.

Parameters:

field - field to which the elements belong

expectedSize - expected number of elements in the map

OpenIntToFieldHashMap

public OpenIntToFieldHashMap(Field<T> field,
                     int expectedSize,
                     T missingEntries)

Build an empty map with specified size.

Parameters:

field - field to which the elements belong

expectedSize - expected number of elements in the map

missingEntries - value to return when a missing entry is fetched

OpenIntToFieldHashMap

public OpenIntToFieldHashMap(OpenIntToFieldHashMap<T> source)

Copy constructor.

Parameters:

source - map to copy

Method Detail

get

public T 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 OpenIntToFieldHashMap.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 T remove(int key)

Remove the value associated with a key.

Parameters:

key - key to which the value is associated

Returns:

removed value

put

public T put(int key,
    T 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