Example usage for java.util.stream Collectors collectingAndThen

Introduction

In this page you can find the example usage for java.util.stream Collectors collectingAndThen.

Prototype

public static <T, A, R, RR> Collector<T, A, RR> collectingAndThen(Collector<T, A, R> downstream,
        Function<R, RR> finisher) 

Source Link

Document

Adapts a Collector to perform an additional finishing transformation.

Usage

From source file:org.keycloak.models.jpa.JpaRealmProvider.java

@Override
public List<GroupModel> getGroups(RealmModel realm) {
    RealmEntity ref = em.getReference(RealmEntity.class, realm.getId());

    return ref.getGroups().stream().map(g -> session.realms().getGroupById(g.getId(), realm))
            .sorted(Comparator.comparing(GroupModel::getName))
            .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
}

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From source file:org.keycloak.models.jpa.JpaRealmProvider.java

@Override
public List<GroupModel> getTopLevelGroups(RealmModel realm) {
    RealmEntity ref = em.getReference(RealmEntity.class, realm.getId());

    return ref.getGroups().stream().filter(g -> g.getParent() == null)
            .map(g -> session.realms().getGroupById(g.getId(), realm))
            .sorted(Comparator.comparing(GroupModel::getName))
            .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
}

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From source file:org.kuali.rice.core.impl.security.PropertySuppressionServiceImpl.java

private static <T, K, U> Collector<T, ?, Map<K, U>> nullSafeToMap(Function<? super T, ? extends K> keyMapper,
        Function<? super T, ? extends U> valueMapper) {
    return Collectors.collectingAndThen(Collectors.toList(), list -> {
        Map<K, U> result = new HashMap<>();
        for (T item : list) {
            K key = keyMapper.apply(item);
            if (result.putIfAbsent(key, valueMapper.apply(item)) != null) {
                throw new IllegalStateException(String.format("Duplicate key %s", key));
            }//  w  w  w .j a  v a 2s .c  om
        }
        return result;
    });
}

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