Liquibase 4.26.0 · liquibase.util.CollectionUtil · APIdia, the JavaDoc alternative

Access	Constructor and Description
public	CollectionUtil()

Method Summary

Modifier and Type	Method and Description
public static <T> List<T>	createIfNull(List<T> currentValue) Returns passed currentValue if it is not null and creates a new ArrayList if it is null.
public static <T> T[]	createIfNull(T[] arguments) Returns a new empty array if the passed array is null.
public static <T> Set<T>	createIfNull(Set<T> currentValue) Returns a new empty set if the passed set is null.
public static <T, E> Map<T, E>	createIfNull(Map<T, E> currentValue) Returns a new empty map if the passed map is null.
public static String	Returns: the properly cased key, if found, or null if not found findKeyInMapIgnoreCase(String the key to search for, in any case key, Map<String, Object> the map in which to search map) Find the actual key in a map, by searching the keys in the map and checking them ignoring case.
public static Map<String, Object>	flatten(Map<String, Object> map) Converts a set of nested maps (like from yaml/json) into a flat map with dot-separated properties
private static Map<String, Object>	flatten(String prefix, Map<String, Object> map)
public static <T> List<Map<String, T>>	permutations(Map<String, List<T>> parameterValues)
private static <T> void	permute(Map<String, T> basePermutation, List<String> remainingKeys, Map<String, List<T>> parameterValues, List<Map<String, T>> returnList)
public static <T> Set<Set<T>>	powerSet(Collection<T> originalSet)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

CollectionUtil	back to summary
public CollectionUtil()

createIfNull	back to summary
public static <T> List<T> createIfNull(List<T> currentValue) Returns passed currentValue if it is not null and creates a new ArrayList if it is null. Example: values = createIfNull(values)

createIfNull	back to summary
public static <T> T[] createIfNull(T[] arguments) Returns a new empty array if the passed array is null.

createIfNull	back to summary
public static <T> Set<T> createIfNull(Set<T> currentValue) Returns a new empty set if the passed set is null.

createIfNull	back to summary
public static <T, E> Map<T, E> createIfNull(Map<T, E> currentValue) Returns a new empty map if the passed map is null.

findKeyInMapIgnoreCase	back to summary
public static String findKeyInMapIgnoreCase(String key, Map<String, Object> map) Find the actual key in a map, by searching the keys in the map and checking them ignoring case. Parameters key:String the key to search for, in any case map:Map<String, Object> the map in which to search Returns:String the properly cased key, if found, or null if not found

findKeyInMapIgnoreCase

public static String findKeyInMapIgnoreCase(String key, Map<String, Object> map)

Find the actual key in a map, by searching the keys in the map and checking them ignoring case.

Parameters

Returns:String

the properly cased key, if found, or null if not found

flatten	back to summary
public static Map<String, Object> flatten(Map<String, Object> map) Converts a set of nested maps (like from yaml/json) into a flat map with dot-separated properties

flatten	back to summary
private static Map<String, Object> flatten(String prefix, Map<String, Object> map)

permutations	back to summary
public static <T> List<Map<String, T>> permutations(Map<String, List<T>> parameterValues)

permute	back to summary
private static <T> void permute(Map<String, T> basePermutation, List<String> remainingKeys, Map<String, List<T>> parameterValues, List<Map<String, T>> returnList)

powerSet	back to summary
public static <T> Set<Set<T>> powerSet(Collection<T> originalSet)