com.alee.utils

Class MapUtils

java.lang.Object

com.alee.utils.MapUtils

public final class MapUtils
extends java.lang.Object

This class provides a set of utilities to work with various maps.

Constructor Summary

Constructors

Constructor and Description
MapUtils()

Method Summary

Modifier and Type	Method and Description
static <K,V> DoubleMap<K,V>	copyDoubleMap(DoubleMap<K,V> map) Returns copied DoubleMap.
static <K,V> java.util.HashMap<K,V>	copyHashMap(java.util.HashMap<K,V> map) Returns copied HashMap.
static <K,V> java.util.LinkedHashMap<K,V>	copyLinkedHashMap(java.util.LinkedHashMap<K,V> map) Returns copied LinkedHashMap.
static <K,V> java.util.HashMap<K,V>	copyMap(java.util.Map<K,V> map) Returns copied Map.
static boolean	isEmpty(java.util.Map<?,?> map) Returns whether specified map is empty or not.
static <K,V> java.util.HashMap<K,V>	merge(java.util.Map<K,V>... maps) Merges specified maps into one new map and returns it.
static <K,V> java.util.HashMap<K,V>	newHashMap(K key, V value) Returns newly created HashMap with the specified key and value pair added.
static <K,V> java.util.HashMap<K,V>	newHashMap(java.lang.Object... objects) Returns newly created HashMap with the specified key and value pairs added.
static <K,V> java.util.LinkedHashMap<K,V>	newLinkedHashMap(K key, V value) Returns newly created LinkedHashMap with the specified key and value pair added.
static <K,V> java.util.LinkedHashMap<K,V>	newLinkedHashMap(java.lang.Object... objects) Returns newly created LinkedHashMap with the specified key and value pairs added.
static <K,V> void	removeAllValues(java.util.Map<K,V> map, V value) Removes all map entries where value is the same as the specified one.

Methods inherited from class java.lang.Object

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

Constructor Detail

MapUtils

public MapUtils()

Method Detail

isEmpty

public static boolean isEmpty(java.util.Map<?,?> map)

Returns whether specified map is empty or not.

Parameters:

map - map to process

Returns:

true if specified map is empty, false otherwise

copyMap

public static <K,V> java.util.HashMap<K,V> copyMap(java.util.Map<K,V> map)

Returns copied Map.

Type Parameters:

K - Map key type

V - Map value type

Parameters:

map - Map to copy

Returns:

copied Map

copyHashMap

public static <K,V> java.util.HashMap<K,V> copyHashMap(java.util.HashMap<K,V> map)

Returns copied HashMap.

Type Parameters:

K - HashMap key type

V - HashMap value type

Parameters:

map - HashMap to copy

Returns:

copied HashMap

copyLinkedHashMap

public static <K,V> java.util.LinkedHashMap<K,V> copyLinkedHashMap(java.util.LinkedHashMap<K,V> map)

Returns copied LinkedHashMap.

Type Parameters:

K - LinkedHashMap key type

V - LinkedHashMap value type

Parameters:

map - LinkedHashMap to copy

Returns:

copied LinkedHashMap

copyDoubleMap

public static <K,V> DoubleMap<K,V> copyDoubleMap(DoubleMap<K,V> map)

Returns copied DoubleMap.

Type Parameters:

K - DoubleMap key type

V - DoubleMap value type

Parameters:

map - DoubleMap to copy

Returns:

copied DoubleMap

newHashMap

public static <K,V> java.util.HashMap<K,V> newHashMap(K key,
                                                      V value)

Returns newly created HashMap with the specified key and value pair added.

Type Parameters:

K - key type

V - value type

Parameters:

key - key to add

value - value to add

Returns:

newly created HashMap

newHashMap

public static <K,V> java.util.HashMap<K,V> newHashMap(java.lang.Object... objects)

Returns newly created HashMap with the specified key and value pairs added.

Type Parameters:

K - key type

V - value type

Parameters:

objects - key-value pairs

Returns:

newly created HashMap

newLinkedHashMap

public static <K,V> java.util.LinkedHashMap<K,V> newLinkedHashMap(K key,
                                                                  V value)

Returns newly created LinkedHashMap with the specified key and value pair added.

Type Parameters:

K - key type

V - value type

Parameters:

key - key to add

value - value to add

Returns:

newly created LinkedHashMap

newLinkedHashMap

public static <K,V> java.util.LinkedHashMap<K,V> newLinkedHashMap(java.lang.Object... objects)

Returns newly created LinkedHashMap with the specified key and value pairs added.

Type Parameters:

K - key type

V - value type

Parameters:

objects - key-value pairs

Returns:

newly created LinkedHashMap

removeAllValues

public static <K,V> void removeAllValues(java.util.Map<K,V> map,
                                         V value)

Removes all map entries where value is the same as the specified one.

Type Parameters:

K - key type

V - value type

Parameters:

map - map to remove entries from

value - value for which entries should be removed

merge

public static <K,V> java.util.HashMap<K,V> merge(java.util.Map<K,V>... maps)

Merges specified maps into one new map and returns it.

Type Parameters:

K - key type

V - value type

Parameters:

maps - maps to merge into new one

Returns:

new map containing all provided maps merged into it