| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.bval.jsr.groups; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.LinkedHashSet; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.function.Consumer; |
| import java.util.function.Predicate; |
| import java.util.stream.Collectors; |
| |
| import org.apache.bval.jsr.util.ToUnmodifiable; |
| import org.apache.bval.util.Validate; |
| |
| /** |
| * Group strategy interface. |
| */ |
| public interface GroupStrategy { |
| public static class Simple implements GroupStrategy { |
| private final Set<Group> groups; |
| |
| private Simple(Set<Group> groups) { |
| this.groups = groups; |
| } |
| |
| @Override |
| public Set<Group> getGroups() { |
| return groups; |
| } |
| |
| @Override |
| public GroupStrategy redefining(Map<Group, ? extends GroupStrategy> redefinitions) { |
| if (Collections.disjoint(redefinitions.keySet(), groups)) { |
| return this; |
| } |
| return groups.stream().map(g -> redefinitions.containsKey(g) ? redefinitions.get(g) : g) |
| .collect(Collectors.collectingAndThen(Collectors.toList(), GroupStrategy::composite)); |
| } |
| |
| @Override |
| public int hashCode() { |
| return groups.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| return obj == this |
| || obj != null && obj.getClass().equals(getClass()) && ((Simple) obj).groups.equals(groups); |
| } |
| |
| @Override |
| public String toString() { |
| return groups.toString(); |
| } |
| } |
| |
| public static class Composite implements GroupStrategy { |
| private final Set<? extends GroupStrategy> components; |
| protected final boolean ordered; |
| |
| public Composite(Collection<? extends GroupStrategy> components, boolean ordered) { |
| Validate.isTrue(Validate.notNull(components).stream().noneMatch(Objects::isNull), |
| "null component not permitted"); |
| this.components = new LinkedHashSet<>(components); |
| this.ordered = ordered; |
| } |
| |
| @Override |
| public Set<Group> getGroups() { |
| return components.stream().map(GroupStrategy::getGroups).flatMap(Collection::stream) |
| .collect(ToUnmodifiable.set()); |
| } |
| |
| @Override |
| public GroupStrategy redefining(Map<Group, ? extends GroupStrategy> redefinitions) { |
| if (!components.isEmpty()) { |
| final Set<GroupStrategy> redef = |
| components.stream().map(cmp -> cmp.redefining(redefinitions)).collect(Collectors.toSet()); |
| if (!redef.equals(components)) { |
| return new Composite(redef, ordered); |
| } |
| } |
| return this; |
| } |
| |
| @Override |
| public boolean applyTo(Predicate<GroupStrategy> operation) { |
| if (components.isEmpty()) { |
| return true; |
| } |
| final boolean applyAll = !ordered; |
| boolean result = true; |
| for (GroupStrategy gs : components) { |
| result = gs.applyTo(operation) && result; |
| if (!(applyAll || result)) { |
| return false; |
| } |
| } |
| return result; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(components, ordered); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null || !obj.getClass().equals(getClass())) { |
| return false; |
| } |
| final Composite other = (Composite) obj; |
| return other.components.equals(components) && other.ordered == ordered; |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("%sordered: %s", ordered ? "" : "un", components); |
| } |
| } |
| |
| public static final GroupStrategy EMPTY = new GroupStrategy() { |
| |
| @Override |
| public GroupStrategy redefining(Map<Group, ? extends GroupStrategy> redefinitions) { |
| return this; |
| } |
| |
| @Override |
| public Set<Group> getGroups() { |
| return Collections.emptySet(); |
| } |
| }; |
| |
| public static GroupStrategy redefining(GroupStrategy source, Map<Group, ? extends GroupStrategy> redefinitions) { |
| Validate.notNull(source, "source"); |
| |
| if (!(redefinitions == null || redefinitions.isEmpty())) { |
| if (redefinitions.containsValue(null)) { |
| redefinitions = redefinitions.entrySet().stream().filter(e -> e.getValue() != null) |
| .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); |
| } |
| if (!redefinitions.isEmpty()) { |
| return source.redefining(redefinitions); |
| } |
| } |
| return source; |
| } |
| |
| public static GroupStrategy simple(Group... groups) { |
| return simple(Arrays.asList(groups)); |
| } |
| |
| public static GroupStrategy simple(Collection<? extends Group> coll) { |
| Validate.notNull(coll); |
| if (coll.size() == 1) { |
| return coll.iterator().next(); |
| } |
| final Set<Group> groups = Collections.unmodifiableSet(new LinkedHashSet<>(coll)); |
| return new Simple(groups); |
| } |
| |
| public static GroupStrategy composite(GroupStrategy... components) { |
| return composite(Arrays.asList(components)); |
| } |
| |
| public static GroupStrategy composite(Collection<? extends GroupStrategy> components) { |
| if (components.isEmpty()) { |
| return EMPTY; |
| } |
| if (components.size() == 1) { |
| return components.iterator().next(); |
| } |
| final Set<GroupStrategy> compressedComponents = new LinkedHashSet<>(); |
| |
| final Consumer<Set<Group>> addGroups = s -> { |
| if (!s.isEmpty()) { |
| compressedComponents.add(simple(s)); |
| s.clear(); |
| } |
| }; |
| final Set<Group> unorderedGroups = new HashSet<>(); |
| for (GroupStrategy component : components) { |
| if (component instanceof Composite && ((Composite) component).ordered) { |
| addGroups.accept(unorderedGroups); |
| compressedComponents.add(component); |
| continue; |
| } |
| unorderedGroups.addAll(component.getGroups()); |
| } |
| addGroups.accept(unorderedGroups); |
| if (compressedComponents.size() == 1) { |
| return compressedComponents.iterator().next(); |
| } |
| return new Composite(compressedComponents, false); |
| } |
| |
| /** |
| * Get the associated groups. |
| * @return {@link Set} of {@link Group} |
| */ |
| Set<Group> getGroups(); |
| |
| /** |
| * Get an equivalent strategy making group substitutions specified by {@code redefinitions}. |
| * @param redefinitions |
| * @return {@link GroupStrategy} |
| */ |
| GroupStrategy redefining(Map<Group, ? extends GroupStrategy> redefinitions); |
| |
| /** |
| * Apply the specified {@code boolean}-returning {@code operation}. |
| * @param operation |
| * @return {@code boolean} |
| */ |
| default boolean applyTo(Predicate<GroupStrategy> operation) { |
| return operation.test(this); |
| } |
| } |