/
ImportAutoConfigurationImportSelector.java
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/
ImportAutoConfigurationImportSelector.java
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/*
* Copyright 2012-2020 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.boot.autoconfigure;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.boot.context.annotation.DeterminableImports;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.core.io.support.SpringFactoriesLoader;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.util.ClassUtils;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.util.ObjectUtils;
/**
* Variant of {@link AutoConfigurationImportSelector} for
* {@link ImportAutoConfiguration @ImportAutoConfiguration}.
*
* @author Phillip Webb
* @author Andy Wilkinson
*/
class ImportAutoConfigurationImportSelector extends AutoConfigurationImportSelector implements DeterminableImports {
private static final Set<String> ANNOTATION_NAMES;
static {
Set<String> names = new LinkedHashSet<>();
names.add(ImportAutoConfiguration.class.getName());
names.add("org.springframework.boot.autoconfigure.test.ImportAutoConfiguration");
ANNOTATION_NAMES = Collections.unmodifiableSet(names);
}
@Override
public Set<Object> determineImports(AnnotationMetadata metadata) {
List<String> candidateConfigurations = getCandidateConfigurations(metadata, null);
Set<String> result = new LinkedHashSet<>(candidateConfigurations);
result.removeAll(getExclusions(metadata, null));
return Collections.unmodifiableSet(result);
}
@Override
protected AnnotationAttributes getAttributes(AnnotationMetadata metadata) {
return null;
}
@Override
protected List<String> getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes) {
List<String> candidates = new ArrayList<>();
Map<Class<?>, List<Annotation>> annotations = getAnnotations(metadata);
annotations.forEach(
(source, sourceAnnotations) -> collectCandidateConfigurations(source, sourceAnnotations, candidates));
return candidates;
}
private void collectCandidateConfigurations(Class<?> source, List<Annotation> annotations,
List<String> candidates) {
for (Annotation annotation : annotations) {
candidates.addAll(getConfigurationsForAnnotation(source, annotation));
}
}
private Collection<String> getConfigurationsForAnnotation(Class<?> source, Annotation annotation) {
String[] classes = (String[]) AnnotationUtils.getAnnotationAttributes(annotation, true).get("classes");
if (classes.length > 0) {
return Arrays.asList(classes);
}
return loadFactoryNames(source);
}
protected Collection<String> loadFactoryNames(Class<?> source) {
return SpringFactoriesLoader.loadFactoryNames(source, getClass().getClassLoader());
}
@Override
protected Set<String> getExclusions(AnnotationMetadata metadata, AnnotationAttributes attributes) {
Set<String> exclusions = new LinkedHashSet<>();
Class<?> source = ClassUtils.resolveClassName(metadata.getClassName(), null);
for (String annotationName : ANNOTATION_NAMES) {
AnnotationAttributes merged = AnnotatedElementUtils.getMergedAnnotationAttributes(source, annotationName);
Class<?>[] exclude = (merged != null) ? merged.getClassArray("exclude") : null;
if (exclude != null) {
for (Class<?> excludeClass : exclude) {
exclusions.add(excludeClass.getName());
}
}
}
for (List<Annotation> annotations : getAnnotations(metadata).values()) {
for (Annotation annotation : annotations) {
String[] exclude = (String[]) AnnotationUtils.getAnnotationAttributes(annotation, true).get("exclude");
if (!ObjectUtils.isEmpty(exclude)) {
exclusions.addAll(Arrays.asList(exclude));
}
}
}
exclusions.addAll(getExcludeAutoConfigurationsProperty());
return exclusions;
}
protected final Map<Class<?>, List<Annotation>> getAnnotations(AnnotationMetadata metadata) {
MultiValueMap<Class<?>, Annotation> annotations = new LinkedMultiValueMap<>();
Class<?> source = ClassUtils.resolveClassName(metadata.getClassName(), null);
collectAnnotations(source, annotations, new HashSet<>());
return Collections.unmodifiableMap(annotations);
}
private void collectAnnotations(Class<?> source, MultiValueMap<Class<?>, Annotation> annotations,
HashSet<Class<?>> seen) {
if (source != null && seen.add(source)) {
for (Annotation annotation : source.getDeclaredAnnotations()) {
if (!AnnotationUtils.isInJavaLangAnnotationPackage(annotation)) {
if (ANNOTATION_NAMES.contains(annotation.annotationType().getName())) {
annotations.add(source, annotation);
}
collectAnnotations(annotation.annotationType(), annotations, seen);
}
}
collectAnnotations(source.getSuperclass(), annotations, seen);
}
}
@Override
public int getOrder() {
return super.getOrder() - 1;
}
@Override
protected void handleInvalidExcludes(List<String> invalidExcludes) {
// Ignore for test
}
}