List of usage examples for java.util.stream Collectors collectingAndThen
public static <T, A, R, RR> Collector<T, A, RR> collectingAndThen(Collector<T, A, R> downstream, Function<R, RR> finisher)
From source file:Main.java
public static void main(String... args) { Map<Type, Food> o = Food.menu.stream().collect(Collectors.groupingBy(Food::getType, Collectors.collectingAndThen( Collectors.reducing((Food d1, Food d2) -> d1.getCalories() > d2.getCalories() ? d1 : d2), Optional::get))); System.out.println(o);/* w ww. ja va2s . com*/ }
From source file:Main.java
public static void main(String[] args) { List<String> names = Employee.persons().stream().map(Employee::getName).collect( Collectors.collectingAndThen(Collectors.toList(), result -> Collections.unmodifiableList(result))); System.out.println(names);//from ww w . jav a2 s . c o m }
From source file:Main.java
public static void main(String... args) { Map<Boolean, Food> o = Food.menu.stream().collect(Collectors.partitioningBy(Food::isVegetarian, Collectors .collectingAndThen(Collectors.maxBy(Comparator.comparingInt(Food::getCalories)), Optional::get))); System.out.println(o);//from ww w.ja v a 2s . c o m }
From source file:Main.java
public static void main(String[] args) { Map<Month, String> dobCalendar = Employee.persons().stream() .collect(Collectors.collectingAndThen(Collectors.groupingBy(p -> p.getDob().getMonth(), Collectors.mapping(Employee::getName, Collectors.joining(" "))), result -> { for (Month m : Month.values()) { result.putIfAbsent(m, "None"); }/*from w ww . j a v a 2s . c o m*/ return Collections.unmodifiableMap(new TreeMap<>(result)); })); dobCalendar.entrySet().forEach(System.out::println); }
From source file:com.teradata.benchto.driver.macro.MacroServiceImpl.java
public void runBenchmarkMacro(String macroName, Optional<Benchmark> benchmark, Optional<Connection> connection) { MacroExecutionDriver macroExecutionDriver = macroExecutionDrivers.stream() .filter(executionDriver -> executionDriver.canExecuteBenchmarkMacro(macroName)) .collect(Collectors.collectingAndThen(toList(), matchingExecutionDrivers -> { if (matchingExecutionDrivers.size() > 1) { throw new IllegalStateException( format("More than one execution driver for macro %s - matching drivers %s", macroName, matchingExecutionDrivers)); } else if (matchingExecutionDrivers.size() == 0) { throw new IllegalStateException(format("No execution driver for macro %s", macroName)); }/*from w ww . j a va2 s . c o m*/ return matchingExecutionDrivers.get(0); })); macroExecutionDriver.runBenchmarkMacro(macroName, benchmark, connection); }
From source file:cloud.api.gateway.ApiGatewayApplication.java
@Bean
UserInfoRestTemplateCustomizer userInfoRestTemplateCustomizer(SpringClientFactory springClientFactory) {
return template -> {
AccessTokenProviderChain accessTokenProviderChain = Stream
.of(new AuthorizationCodeAccessTokenProvider(), new ImplicitAccessTokenProvider(),
new ResourceOwnerPasswordAccessTokenProvider(),
new ClientCredentialsAccessTokenProvider())
.peek(tp -> tp.setRequestFactory(new RibbonClientHttpRequestFactory(springClientFactory)))
.collect(Collectors.collectingAndThen(Collectors.toList(), AccessTokenProviderChain::new));
template.setAccessTokenProvider(accessTokenProviderChain);
};//from w w w.ja v a 2s . c o m
}
From source file:com.epam.ta.reportportal.core.project.settings.impl.UpdateProjectSettingsHandler.java
@SuppressWarnings("unused") private static <T> Collector<T, ?, T> findOneCollector(String id) { return Collectors.collectingAndThen(Collectors.toList(), shouldBeOne -> { if (shouldBeOne.size() != 1) { throw new ReportPortalException(String.format("No such issue sub-type found for id='%s'", id)); }//w ww. j a va2s. com return shouldBeOne.get(0); }); }
From source file:com.ikanow.aleph2.graph.titan.utils.TitanGraphBuildingUtils.java
/** Separates out edges/vertices, groups by key * @param config//w ww .ja v a2 s . com * @param vertices_and_edges * @return */ protected static Map<ObjectNode, Tuple2<List<ObjectNode>, List<ObjectNode>>> groupNewEdgesAndVertices( final GraphSchemaBean config, final MutableStatsBean stats, final Stream<ObjectNode> vertices_and_edges) { final Map<ObjectNode, Tuple2<List<ObjectNode>, List<ObjectNode>>> nodes_to_get = vertices_and_edges .filter(o -> o.has(GraphAnnotationBean.type)) .<Tuple3<ObjectNode, ObjectNode, Boolean>>flatMap(o -> { final JsonNode type = o.get(GraphAnnotationBean.type); if ((null == type) || !type.isTextual()) return Stream.empty(); if (GraphAnnotationBean.ElementType.edge.toString().equals(type.asText())) { stats.edges_emitted++; // Grab both edges from both ends: return Stream.concat( Optional.ofNullable(o.get(GraphAnnotationBean.inV)) .map(k -> Stream.of(Tuples._3T(convertToObject(k, config), o, false))) .orElse(Stream.empty()), Optional.ofNullable(o.get(GraphAnnotationBean.outV)) .map(k -> Stream.of(Tuples._3T(convertToObject(k, config), o, false))) .orElse(Stream.empty())); } else if (GraphAnnotationBean.ElementType.vertex.toString().equals(type.asText())) { stats.vertices_emitted++; return Optional.ofNullable(o.get(GraphAnnotationBean.id)) .map(k -> Stream.of(Tuples._3T(convertToObject(k, config), o, true))) .orElse(Stream.empty()); } else return Stream.empty(); }).collect(Collectors.groupingBy(t3 -> t3._1() // group by key , Collectors.collectingAndThen( Collectors.<Tuple3<ObjectNode, ObjectNode, Boolean>>partitioningBy(t3 -> t3._3()) // group by edge/vertex , m -> Tuples._2T(m.get(true).stream().map(t3 -> t3._2()).collect(Collectors.toList()) // convert group edge/vertex to pair of lists , m.get(false).stream().map(t3 -> t3._2()).collect(Collectors.toList()))))); return nodes_to_get; }
From source file:org.jamocha.dn.compiler.pathblocks.PathBlocks.java
protected static <T, K, D> Collector<T, ?, Set<D>> groupingIntoSets( final Function<? super T, ? extends K> classifier, final Collector<? super T, ?, D> downstream) { final Collector<T, ?, Map<K, D>> groupingBy = groupingBy(classifier, downstream); return Collectors.collectingAndThen(groupingBy, map -> new HashSet<D>(map.values())); }
From source file:org.jamocha.dn.compiler.pathblocks.PathBlocks.java
protected static PathBlockSet findAllMaximalBlocksInReducedScope(final Set<FilterInstance> filterInstances, final PathBlockSet resultBlocks) { final Iterable<List<FilterInstance>> filterInstancesGroupedByRule = filterInstances.stream() .collect(Collectors.collectingAndThen(groupingBy(FilterInstance::getRuleOrProxy), Map::values)); final UndirectedGraph<FilterInstance, ConflictEdge> conflictGraph = determineConflictGraph( filterInstancesGroupedByRule); final Set<Set<Set<FilterInstance>>> filterInstancesGroupedByFilterAndByRule = filterInstances.stream() .collect(groupingIntoSets(FilterInstance::getFilter, groupingIntoSets(FilterInstance::getRuleOrProxy, toSet()))); for (final Set<Set<FilterInstance>> filterInstancesOfOneFilterGroupedByRule : filterInstancesGroupedByFilterAndByRule) { vertical(conflictGraph, filterInstancesOfOneFilterGroupedByRule, resultBlocks); }/* w w w . jav a 2 s . co m*/ return resultBlocks; }