Class MultiLevelMapHelper

java.lang.Object

com.kingsrook.qqq.backend.core.utils.collections.MultiLevelMapHelper

public class MultiLevelMapHelper
extends Object

Help you use a multi-level map, such as: Map[String, Map[String, Integer]] countryStateCountMap = new HashMap[](); Where you always want to put new maps at the lower-level if they aren't there, and similarly, you want to start with a 0 for the value under each (final) key. So instead of like: countryStateCountMap.computeIfAbsent("US", () -> new HashMap()); Map stateCountMap = countryStateCountMap.get("US"); stateCountMap.putIfAbsent("MO", 0); stateCountMap.put(stateCountMap.get("MO") + count); You can just do: MultiLevelMapHelper.getOrPutNextLevel(countryStateCountMap, "US", stateMap -> MultiLevelMapHelper.getOrPutAndIncrement(stateMap, "MO", count)); Or for a bigger map, such as: Map[Integer, Map[String, Map[Integer, Map[String, Integer]]]] bigOleMap = new HashMap[](); getOrPutNextLevel(bigOleMap, clientId, map -> getOrPutNextLevel(map, sku, map2 -> getOrPutNextLevel(map2, warehouseId, map3 -> getOrPutAndIncrement(map3, state))));

Constructor Summary

Constructors

Constructor	Description
MultiLevelMapHelper()

Method Summary

Modifier and Type	Method	Description
static <K> void	getOrPutAndIncrement(Map<K,Integer> map, K key)	For the given map, If the key is not found, put a 1 under it.
static <K> void	getOrPutAndIncrement(Map<K,Integer> map, K key, Integer amount)	For the given map, If the key is not found, put the Integer amount under it.
static <K, V> void	getOrPutFinalLevel(Map<K,V> map, K key, Supplier<V> notFoundSupplier, Function<V,V> next)	For the given map, If the key is not found, run the supplier and put its result under that key Then apply the Function next to that value, replacing the value under the key.
static <K, K2, V> void	getOrPutNextLevel(Map<K,Map<K2,V>> map, K key, Consumer<Map<K2,V>> next)	For the given map, If the key is not found, make a new map[1] and put its result under that key Then get the value under that key (the next level map) and pass it to the Consumer next
static <K, V> void	getOrPutNextLevel(Map<K,V> map, K key, Supplier<V> notFoundSupplier, Consumer<V> next)	For the given map, If the key is not found, run the supplier and put its result under that key Then get the value under that key and pass it to the Consumer next

Methods inherited from class java.lang.Object

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

Constructor Details

MultiLevelMapHelper

public MultiLevelMapHelper()

Method Details

getOrPutNextLevel

public static <K,
V> void getOrPutNextLevel(Map<K,V> map,
 K key,
 Supplier<V> notFoundSupplier,
 Consumer<V> next)

For the given map, If the key is not found, run the supplier and put its result under that key Then get the value under that key and pass it to the Consumer next

getOrPutNextLevel

public static <K,
K2,
V> void getOrPutNextLevel(Map<K,Map<K2,V>> map,
 K key,
 Consumer<Map<K2,V>> next)

For the given map, If the key is not found, make a new map[1] and put its result under that key Then get the value under that key (the next level map) and pass it to the Consumer next. [1] - the new map will be the same type as the input map, if possible - else will be a new HashMap. To control the map type, see the overload that takes a Supplier notFoundSupplier.

getOrPutFinalLevel

public static <K,
V> void getOrPutFinalLevel(Map<K,V> map,
 K key,
 Supplier<V> notFoundSupplier,
 Function<V,V> next)

For the given map, If the key is not found, run the supplier and put its result under that key Then apply the Function next to that value, replacing the value under the key.

getOrPutAndIncrement

public static <K> void getOrPutAndIncrement(Map<K,Integer> map,
 K key)

For the given map, If the key is not found, put a 1 under it. else increment the value under the key.

getOrPutAndIncrement

public static <K> void getOrPutAndIncrement(Map<K,Integer> map,
 K key,
 Integer amount)

For the given map, If the key is not found, put the Integer amount under it. else increment the value under the key by the Integer amount.