| /* |
| * 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.valueextraction; |
| |
| import java.io.IOException; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Type; |
| import java.lang.reflect.TypeVariable; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Properties; |
| import java.util.Set; |
| import java.util.function.BooleanSupplier; |
| import java.util.function.Supplier; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| import javax.validation.valueextraction.ValueExtractor; |
| import javax.validation.valueextraction.ValueExtractorDeclarationException; |
| import javax.validation.valueextraction.ValueExtractorDefinitionException; |
| |
| import org.apache.bval.jsr.metadata.ContainerElementKey; |
| import org.apache.bval.util.Exceptions; |
| import org.apache.bval.util.Lazy; |
| import org.apache.bval.util.StringUtils; |
| import org.apache.bval.util.Validate; |
| import org.apache.bval.util.reflection.Reflection; |
| import org.apache.bval.util.reflection.TypeUtils; |
| |
| public class ValueExtractors { |
| public static final ValueExtractors DEFAULT; |
| |
| static { |
| DEFAULT = new ValueExtractors(null) { |
| { |
| final Properties defaultExtractors = new Properties(); |
| try { |
| defaultExtractors.load(ValueExtractors.class.getResourceAsStream("DefaultExtractors.properties")); |
| } catch (IOException e) { |
| throw new IllegalStateException(e); |
| } |
| split(defaultExtractors.getProperty(ValueExtractor.class.getName())).map(cn -> { |
| try { |
| @SuppressWarnings("unchecked") |
| final Class<? extends ValueExtractor<?>> result = |
| (Class<? extends ValueExtractor<?>>) Reflection.toClass(cn) |
| .asSubclass(ValueExtractor.class); |
| return result; |
| } catch (Exception e) { |
| throw new IllegalStateException(e); |
| } |
| }).map(ValueExtractors::newInstance).forEach(super::add); |
| |
| split(defaultExtractors.getProperty(ValueExtractor.class.getName() + ".container")) |
| .flatMap(ValueExtractors::loadValueExtractors).forEach(super::add); |
| } |
| |
| @Override |
| public void add(ValueExtractor<?> extractor) { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| |
| public static Class<?> getExtractedType(ValueExtractor<?> extractor, Type target) { |
| final ContainerElementKey key = ContainerElementKey.forValueExtractor(extractor); |
| Type result = key.getAnnotatedType().getType(); |
| if (result instanceof TypeVariable<?>) { |
| result = TypeUtils.getTypeArguments(target, key.getContainerClass()).get(result); |
| } |
| Exceptions.raiseUnless(result instanceof Class<?>, ValueExtractorDefinitionException::new, |
| "%s did not resolve to a %s relative to %s", key, Class.class.getName(), target); |
| return (Class<?>) result; |
| } |
| |
| private static Stream<String> split(String s) { |
| return Stream.of(StringUtils.split(s, ',')); |
| } |
| |
| private static <T> T newInstance(Class<T> t) { |
| try { |
| return t.getConstructor().newInstance(); |
| } catch (NoSuchMethodException | InstantiationException | IllegalAccessException e) { |
| throw new IllegalStateException(e); |
| } catch (InvocationTargetException e) { |
| throw new IllegalStateException(e.getTargetException()); |
| } |
| } |
| |
| private static Stream<ValueExtractor<?>> loadValueExtractors(String containerClassName) { |
| try { |
| final Class<? extends BooleanSupplier> activation = |
| Reflection.toClass(containerClassName + "$Activation").asSubclass(BooleanSupplier.class); |
| if (!newInstance(activation).getAsBoolean()) { |
| return Stream.empty(); |
| } |
| } catch (ClassNotFoundException e) { |
| // always active |
| } |
| final Class<?> containerClass; |
| try { |
| containerClass = Reflection.toClass(containerClassName); |
| } catch (ClassNotFoundException e) { |
| throw new IllegalStateException(e); |
| } |
| return Stream.of(containerClass.getClasses()).filter(ValueExtractor.class::isAssignableFrom).map(c -> { |
| @SuppressWarnings("unchecked") |
| final Class<? extends ValueExtractor<?>> result = |
| (Class<? extends ValueExtractor<?>>) c.asSubclass(ValueExtractor.class); |
| return result; |
| }).map(ValueExtractors::newInstance); |
| } |
| |
| private final Lazy<Map<ContainerElementKey, ValueExtractor<?>>> valueExtractors = new Lazy<>(HashMap::new); |
| private final ValueExtractors parent; |
| |
| public ValueExtractors() { |
| this(DEFAULT); |
| } |
| |
| private ValueExtractors(ValueExtractors parent) { |
| this.parent = parent; |
| } |
| |
| public ValueExtractors createChild() { |
| return new ValueExtractors(this); |
| } |
| |
| public void add(ValueExtractor<?> extractor) { |
| Validate.notNull(extractor); |
| valueExtractors.get().compute(ContainerElementKey.forValueExtractor(extractor), (k, v) -> { |
| Exceptions.raiseIf(v != null, ValueExtractorDeclarationException::new, |
| "Multiple context-level %ss specified for %s", ValueExtractor.class.getSimpleName(), k); |
| return extractor; |
| }); |
| } |
| |
| public Map<ContainerElementKey, ValueExtractor<?>> getValueExtractors() { |
| final Lazy<Map<ContainerElementKey, ValueExtractor<?>>> result = new Lazy<>(HashMap::new); |
| populate(result); |
| return result.optional().orElseGet(Collections::emptyMap); |
| } |
| |
| public ValueExtractor<?> find(ContainerElementKey key) { |
| final Map<ContainerElementKey, ValueExtractor<?>> allValueExtractors = getValueExtractors(); |
| if (allValueExtractors.containsKey(key)) { |
| return allValueExtractors.get(key); |
| } |
| // search for assignable ContainerElementKey: |
| Set<ContainerElementKey> assignableKeys = key.getAssignableKeys(); |
| while (!assignableKeys.isEmpty()) { |
| final Optional<ValueExtractor<?>> found = assignableKeys.stream().filter(allValueExtractors::containsKey) |
| .<ValueExtractor<?>> map(allValueExtractors::get).findFirst(); |
| if (found.isPresent()) { |
| return found.get(); |
| } |
| assignableKeys = assignableKeys.stream().map(ContainerElementKey::getAssignableKeys) |
| .flatMap(Collection::stream).collect(Collectors.toSet()); |
| } |
| return null; |
| } |
| |
| protected void populate(Supplier<Map<ContainerElementKey, ValueExtractor<?>>> target) { |
| Optional.ofNullable(parent).ifPresent(p -> p.populate(target)); |
| valueExtractors.optional().ifPresent(m -> target.get().putAll(m)); |
| } |
| } |