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

Class Views

java.lang.Object

org.glassfish.jersey.internal.util.collection.Views

public class Views
extends Object

Collections utils, which provide transforming views for List and Map.

Author:

Pavel Bucek

Method Summary

Modifier and Type	Method	Description
static <T, R> List<T>	listView(List<R> originalList, Function<R,T> transformer)	Create a List view, which transforms the values of provided original list.
static Map<String,List<String>>	mapObjectToStringView(Map<String,List<Object>> originalMap, Function<List<Object>,List<String>> valuesTransformer)	Create a Map view, which transforms the values of provided original map.
static <K, V, O> Map<K,V>	mapView(Map<K,O> originalMap, Function<O,V> valuesTransformer)	Create a Map view, which transforms the values of provided original map.
static <E> Set<E>	setDiffView(Set<? extends E> set1, Set<? extends E> set2)	Create a view of a difference of provided sets, i.e. the diff filters out from the first set the items included in the second set.
static <E> Set<E>	setUnionView(Set<? extends E> set1, 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

Method Details

listView

public static <T,
R> List<T> listView(List<R> originalList,
 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> Map<K,V> mapView(Map<K,O> originalMap,
 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.

mapObjectToStringView

public static Map<String,List<String>> mapObjectToStringView(Map<String,List<Object>> originalMap,
 Function<List<Object>,List<String>> valuesTransformer)

Create a Map view, which transforms the values of provided original map.

Parameters:

originalMap - provided map.

valuesTransformer - values transformer.

Returns:

transformed map view.

setUnionView

public static <E> Set<E> setUnionView(Set<? extends E> set1,
 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> Set<E> setDiffView(Set<? extends E> set1,
 Set<? extends E> set2)

Create a view of a difference of provided sets, i.e. the diff filters out from the first set the items included in the second set.

View is updated whenever any of the provided set changes.

Type Parameters:

E - set item type.

Parameters:

set1 - first set.

set2 - second set.

Returns:

view that is a difference of given sets.