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A java library with many useful functions and classes
package net.lenni0451.commons.collections;
import lombok.experimental.UtilityClass;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;
@UtilityClass
public class MapOps {
/**
* Recursively put all values from other into map.
* This method recursively checks all values that are maps too.
*
* @param map The map to put the values into
* @param other The map to get the values from
*/
public static void recursivePutAll(final Map map, final Map other) {
recursivePutAll(map, other, Map.class::isInstance, Map.class::cast);
}
/**
* Recursively put all values from other into map.
* This method recursively checks all values that are maps too.
*
* @param map The map to put the values into
* @param other The map to get the values from
* @param valueMapCheck A function to check if a value is a map
* @param valueToMap A function to cast a value to a map
* @param The type of the casted values
*/
public static void recursivePutAll(final Map map, final Map other, final Function valueMapCheck, final Function> valueToMap) {
for (Map.Entry entry : other.entrySet()) {
if (map.containsKey(entry.getKey())) {
Object rawValue1 = map.get(entry.getKey());
Object rawValue2 = entry.getValue();
if (valueMapCheck.apply(rawValue1) && valueMapCheck.apply(rawValue2)) {
recursivePutAll(valueToMap.apply((V) map.get(entry.getKey())), valueToMap.apply((V) entry.getValue()), valueMapCheck, valueToMap);
} else {
uncheckedPut(map, entry.getKey(), entry.getValue());
}
} else {
uncheckedPut(map, entry.getKey(), entry.getValue());
}
}
}
/**
* Get all duplicate values from map 1 that are also in map 2.
* This method recursively checks all values that are maps too.
*
* @param map1 The map to check
* @param map2 The map to check against
* @return A map with all duplicate values
*/
public static Map getDuplicates(final Map map1, final Map map2) {
return getDuplicates(map1, map2, Map.class::isInstance, Map.class::cast);
}
/**
* Get all duplicate values from map 1 that are also in map 2.
* This method recursively checks all values that are maps too.
*
* @param map1 The map to check
* @param map2 The map to check against
* @param valueMapCheck A function to check if a value is a map
* @param valueToMap A function to cast a value to a map
* @param The type of the casted values
* @return A map with all duplicate values
*/
public static Map getDuplicates(final Map map1, final Map map2, final Function valueMapCheck, final Function> valueToMap) {
Map duplicates = new HashMap<>();
for (Map.Entry entry : map1.entrySet()) {
if (!map2.containsKey(entry.getKey())) continue;
if (map2.get(entry.getKey()).equals(entry.getValue())) {
duplicates.put(entry.getKey(), entry.getValue());
} else {
Object rawValue1 = entry.getValue();
Object rawValue2 = map2.get(entry.getKey());
if (valueMapCheck.apply(rawValue1) && valueMapCheck.apply(rawValue2)) {
Map subDuplicates = getDuplicates(valueToMap.apply((V) entry.getValue()), valueToMap.apply((V) map2.get(entry.getKey())), valueMapCheck, valueToMap);
if (!subDuplicates.isEmpty()) duplicates.put(entry.getKey(), subDuplicates);
}
}
}
return duplicates;
}
/**
* Get all unique values from map 1 that are not in map 2.
* This method recursively checks all values that are maps too.
*
* @param map The map to check
* @param other The map to check against
* @return A map with all unique values
*/
public static Map getUniques(final Map map, final Map other) {
return getUniques(map, other, Map.class::isInstance, Map.class::cast);
}
/**
* Get all unique values from map 1 that are not in map 2.
* This method recursively checks all values that are maps too.
*
* @param map The map to check
* @param other The map to check against
* @param valueMapCheck A function to check if a value is a map
* @param valueToMap A function to cast a value to a map
* @param The type of the casted values
* @return A map with all unique values
*/
public static Map getUniques(final Map map, final Map other, final Function valueMapCheck, final Function> valueToMap) {
Map uniques = new HashMap<>();
for (Map.Entry entry : map.entrySet()) {
if (!other.containsKey(entry.getKey())) {
uniques.put(entry.getKey(), entry.getValue());
} else {
Object rawValue1 = entry.getValue();
Object rawValue2 = other.get(entry.getKey());
if (valueMapCheck.apply(rawValue1) && valueMapCheck.apply(rawValue2)) {
Map subUniques = getUniques(valueToMap.apply((V) entry.getValue()), valueToMap.apply((V) other.get(entry.getKey())), valueMapCheck, valueToMap);
if (!subUniques.isEmpty()) uniques.put(entry.getKey(), subUniques);
} else {
if (!rawValue1.equals(rawValue2)) uniques.put(entry.getKey(), entry.getValue());
}
}
}
return uniques;
}
@SuppressWarnings({"rawtypes", "unchecked"})
private static void uncheckedPut(final Map map, final Object key, final Object value) {
map.put(key, value);
}
}