Package co.kuali.coeus.s3.conv

Class CollectionUtils

java.lang.Object
co.kuali.coeus.s3.conv.CollectionUtils
public final class CollectionUtils extends Object

  • Method Details

    • zipMap

      public static <T,​ U> Map<T,​U> zipMap​(T[] keys, U[] values)
      Takes an array of keys and an array of values and constructs a map. Both key and value arrays must be the same length and non-null.
      Type Parameters:
      T - the key type
      U - the value type
      Parameters:
      keys - the keys. Cannot be null
      values - the values. Cannot be null
      Returns:
      a map. cannot return null
      Throws:
      IllegalArgumentException - if either argument is null or the arrays aren't the same length

    • entry

      public static <K,​ V> Map.Entry<K,​V> entry​(K key, V value)
      Creates an entry from a key and value.
      Type Parameters:
      K - the key type
      V - the value type
      Parameters:
      key - the key. Can be null.
      value - the value. Can be null.
      Returns:
      a Map.Entry

    • entriesToMap

      public static <K,​ U> Collector<Map.Entry<K,​U>,​?,​Map<K,​U>> entriesToMap()
      Convenience method to a return a Collector that converts an Map.Entry to a Map.
      Type Parameters:
      K - the key type
      U - the value type
      Returns:
      A Collector from Map.Entry to Map

    • entriesToConcurrentMap

      public static <K,​ U> Collector<Map.Entry<K,​U>,​?,​ConcurrentMap<K,​U>> entriesToConcurrentMap()
      Convenience method to a return a Collector that converts an Map.Entry to a ConcurrentMap.
      Type Parameters:
      K - the key type
      U - the value type
      Returns:
      A Collector from Map.Entry to ConcurrentMap

    • unsafeCast

      public static <K,​ V> Map.Entry<K,​V> unsafeCast​(Map.Entry entry)
      This method takes a raw Map.Entry and casts it to a generic kind.
      Type Parameters:
      K - the key type
      V - the value type
      Parameters:
      entry - the entry to cast
      Returns:
      the passed in entry casted