Package org.glassfish.jersey.internal.util.collection

Class Views

  • public class Views
extends java.lang.Object
    Collections utils, which provide transforming views for List and Map.

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private Views()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static <T,​R>
      java.util.List<T>      		 listView​(java.util.List<R> originalList, java.util.function.Function<R,​T> transformer)
      Create a List view, which transforms the values of provided original list.
      static <K,​V,​O>
      java.util.Map<K,​V>      		 mapView​(java.util.Map<K,​O> originalMap, java.util.function.Function<O,​V> valuesTransformer)
      Create a Map view, which transforms the values of provided original map.
      static <E> java.util.Set<E> setDiffView​(java.util.Set<? extends E> set1, java.util.Set<? extends E> set2)
      Create a view of a difference of provided sets.
      static <E> java.util.Set<E> setUnionView​(java.util.Set<? extends E> set1, java.util.Set<? extends E> set2)
      Create a view of an union of provided sets.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • Views

        private Views()

    • Method Detail

      • listView

        public static <T,​R> java.util.List<T> listView​(java.util.List<R> originalList,
                                                     java.util.function.Function<R,​T> transformer)
        Create a List view, which transforms the values of provided original list.

        Removing elements from the view is supported, adding and setting isn't and throws UnsupportedOperationException when invoked.

        Type Parameters:
        T - transformed type parameter.
        R - type of the element from provided list.
        Parameters:
        originalList - original list.
        transformer - transforming functions.
        Returns:
        transformed list view.

      • mapView

        public static <K,​V,​O> java.util.Map<K,​V> mapView​(java.util.Map<K,​O> originalMap,
                                                                   java.util.function.Function<O,​V> valuesTransformer)
        Create a Map view, which transforms the values of provided original map.

        Removing elements from the map view is supported, adding and setting isn't and throws UnsupportedOperationException when invoked.

        Type Parameters:
        K - key type.
        V - transformed value type.
        O - original value type.
        Parameters:
        originalMap - provided map.
        valuesTransformer - values transformer.
        Returns:
        transformed map view.

      • setUnionView

        public static <E> java.util.Set<E> setUnionView​(java.util.Set<? extends E> set1,
                                                java.util.Set<? extends E> set2)
        Create a view of an union of provided sets.

        View is updated whenever any of the provided set changes.

        Type Parameters:
        E - set item type.
        Parameters:
        set1 - first set.
        set2 - second set.
        Returns:
        union view of given sets.

      • setDiffView

        public static <E> java.util.Set<E> setDiffView​(java.util.Set<? extends E> set1,
                                               java.util.Set<? extends E> set2)
        Create a view of a difference of provided sets.

        View is updated whenever any of the provided set changes.

        Type Parameters:
        E - set item type.
        Parameters:
        set1 - first set.
        set2 - second set.
        Returns:
        union view of given sets.