org.omnaest.utils.structure.map
Class MapUtils

java.lang.Object
  org.omnaest.utils.structure.map.MapUtils

public class MapUtils
extends Object

Helper class for Map operations.

Author:

Omnaest

Nested Class Summary

static interface

MapUtils.MapElementMergeOperation<K,V> A MapUtils.MapElementMergeOperation defines a MapUtils.MapElementMergeOperation.merge(Object, Object, Map) operation to merge Map elements into a merged Map instance.

Constructor Summary

MapUtils()

Method Summary

static <KeyFrom,KeyTo,ValueFrom,ValueTo> Map<KeyTo,ValueTo>	convertMap(Map<KeyFrom,ValueFrom> map, CollectionUtils.ElementConverter<KeyFrom,KeyTo> keyElementConverter, CollectionUtils.ElementConverter<ValueFrom,ValueTo> valueElementConverter) Converts a given map into a new map with new types.
static <KeyFrom,KeyTo,Value> Map<KeyTo,Value>	convertMapKey(Map<KeyFrom,Value> map, CollectionUtils.ElementConverter<KeyFrom,KeyTo> keyElementConverter) Converts the key of a map into another key.
static <K,VA,VB> List<TupleDuad<VA,VB>>	innerJoinMapByKey(Map<K,VA> mapA, Map<K,VB> mapB) Returns a list of TupleDuad instances which have always the value of the first map and the value of the second map which share the same key over both maps.
static <K,V> Map<K,V>	mergeAll(Collection<Map<K,V>> mapCollection) Merges all given Map instances into a single LinkedHashMap.
static <K,V> Map<K,V>	mergeAll(Collection<Map<K,V>> mapCollection, MapUtils.MapElementMergeOperation<K,V> mapElementMergeOperation) Merges all given Map instances into a single LinkedHashMap using the given MapUtils.MapElementMergeOperation.
static <K,V> Map<K,V>	mergeAll(Map<K,V>... maps) Merges all given Map instances into a single LinkedHashMap.
static <K,V> Map<K,V>	mergeAll(MapUtils.MapElementMergeOperation<K,V> mapElementMergeOperation, Map<K,V>... maps) Merges all given Map instances into a single LinkedHashMap using the given MapUtils.MapElementMergeOperation.
static <K,V> String	toString(Map<K,V> map) Returns a String representation for a Map

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

mergeAll

public static <K,V> Map<K,V> mergeAll(MapUtils.MapElementMergeOperation<K,V> mapElementMergeOperation,
                                      Map<K,V>... maps)

Merges all given Map instances into a single LinkedHashMap using the given MapUtils.MapElementMergeOperation.

Type Parameters:

K -

V -

Parameters:

mapElementMergeOperation -

maps -

Returns:

See Also:

mergeAll(Map...), mergeAll(Collection, MapElementMergeOperation)

mergeAll

public static <K,V> Map<K,V> mergeAll(Collection<Map<K,V>> mapCollection,
                                      MapUtils.MapElementMergeOperation<K,V> mapElementMergeOperation)

Merges all given Map instances into a single LinkedHashMap using the given MapUtils.MapElementMergeOperation.

Type Parameters:

K -

V -

Parameters:

mapCollection -

mapElementMergeOperation -

Returns:

See Also:

mergeAll(Map...)

mergeAll

public static <K,V> Map<K,V> mergeAll(Collection<Map<K,V>> mapCollection)

Merges all given Map instances into a single LinkedHashMap.

Type Parameters:

K -

V -

Parameters:

mapCollection -

Returns:

See Also:

mergeAll(Map...)

mergeAll

public static <K,V> Map<K,V> mergeAll(Map<K,V>... maps)

Merges all given Map instances into a single LinkedHashMap.

Type Parameters:

K -

V -

Parameters:

maps -

Returns:

See Also:

mergeAll(Collection), mergeAll(Collection, MapElementMergeOperation)

innerJoinMapByKey

public static <K,VA,VB> List<TupleDuad<VA,VB>> innerJoinMapByKey(Map<K,VA> mapA,
                                                                 Map<K,VB> mapB)

Returns a list of TupleDuad instances which have always the value of the first map and the value of the second map which share the same key over both maps.

Type Parameters:

K -

VA -

VB -

Parameters:

mapA -

mapB -

Returns:

convertMapKey

public static <KeyFrom,KeyTo,Value> Map<KeyTo,Value> convertMapKey(Map<KeyFrom,Value> map,
                                                                   CollectionUtils.ElementConverter<KeyFrom,KeyTo> keyElementConverter)

Converts the key of a map into another key.

Type Parameters:

KeyFrom -

KeyTo -

Value -

Parameters:

map -

keyElementConverter -

Returns:

convertMap

public static <KeyFrom,KeyTo,ValueFrom,ValueTo> Map<KeyTo,ValueTo> convertMap(Map<KeyFrom,ValueFrom> map,
                                                                              CollectionUtils.ElementConverter<KeyFrom,KeyTo> keyElementConverter,
                                                                              CollectionUtils.ElementConverter<ValueFrom,ValueTo> valueElementConverter)

Converts a given map into a new map with new types. Makes use of element converters.

Parameters:

map -

keyElementConverter -

valueElementConverter -

Returns:

See Also:

CollectionUtils.ElementConverter

toString

public static <K,V> String toString(Map<K,V> map)

Returns a String representation for a Map

Parameters:

map -

Returns: