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Prevent duplicate @Import processing

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Refactor ConfigurationClassParser to recursively find values from
all @Import annotations, combining them into a single unique set.

This change prevents ImportBeanDefinitionRegistrars from being
invoked twice.

Issue: SPR-9925
This commit is contained in:
Phillip Webb
2012-10-30 22:13:15 -07:00
committed by Chris Beams
parent e6c4840356
commit 6d8b37d8bb
2 changed files with 84 additions and 43 deletions
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74
spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java
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@@ -17,14 +17,13 @@
package org.springframework.context.annotation;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Stack;
@@ -222,10 +221,9 @@ class ConfigurationClassParser {
}
// process any @Import annotations
List<AnnotationAttributes> imports =
findAllAnnotationAttributes(Import.class, metadata.getClassName(), true);
for (AnnotationAttributes importAnno : imports) {
processImport(configClass, importAnno.getStringArray("value"), true);
Set<String> imports = getImports(metadata.getClassName(), null, new HashSet<String>());
if (imports != null && !imports.isEmpty()) {
processImport(configClass, imports.toArray(new String[imports.size()]), true);
}
// process any @ImportResource annotations
@@ -265,45 +263,36 @@ class ConfigurationClassParser {
}
/**
* Return a list of attribute maps for all declarations of the given annotation
* on the given annotated class using the given MetadataReaderFactory to introspect
* annotation metadata. Meta-annotations are ordered first in the list, and if the
* target annotation is declared directly on the class, its map of attributes will be
* ordered last in the list.
* @param targetAnnotation the annotation to search for, both locally and as a meta-annotation
* @param annotatedClassName the class to inspect
* @param classValuesAsString whether class attributes should be returned as strings
* Recursively collect all declared {@code @Import} values. Unlike most
* meta-annotations it is valid to have several {@code @Import}s declared with
* different values, the usual process or returning values from the first
* meta-annotation on a class is not sufficient.
* <p>For example, it is common for a {@code @Configuration} class to declare direct
* {@code @Import}s in addition to meta-imports originating from an {@code @Enable}
* annotation.
* @param className the class name to search
* @param imports the imports collected so far or {@code null}
* @param visited used to track visited classes to prevent infinite recursion (must not be null)
* @return a set of all {@link Import#value() import values} or {@code null}
* @throws IOException if there is any problem reading metadata from the named class
*/
private List<AnnotationAttributes> findAllAnnotationAttributes(
Class<? extends Annotation> targetAnnotation, String annotatedClassName,
boolean classValuesAsString) throws IOException {
List<AnnotationAttributes> allAttribs = new ArrayList<AnnotationAttributes>();
MetadataReader reader = this.metadataReaderFactory.getMetadataReader(annotatedClassName);
AnnotationMetadata metadata = reader.getAnnotationMetadata();
String targetAnnotationType = targetAnnotation.getName();
for (String annotationType : metadata.getAnnotationTypes()) {
if (annotationType.equals(targetAnnotationType)) {
continue;
private Set<String> getImports(String className, Set<String> imports,
Set<String> visited) throws IOException {
if (visited.add(className)) {
AnnotationMetadata metadata = metadataReaderFactory.getMetadataReader(className).getAnnotationMetadata();
Map<String, Object> attributes = metadata.getAnnotationAttributes(Import.class.getName(), true);
if (attributes != null) {
String[] value = (String[]) attributes.get("value");
if (value != null && value.length > 0) {
imports = (imports == null ? new LinkedHashSet<String>() : imports);
imports.addAll(Arrays.asList(value));
}
}
AnnotationMetadata metaAnnotations =
this.metadataReaderFactory.getMetadataReader(annotationType).getAnnotationMetadata();
AnnotationAttributes targetAttribs =
AnnotationAttributes.fromMap(metaAnnotations.getAnnotationAttributes(targetAnnotationType, classValuesAsString));
if (targetAttribs != null) {
allAttribs.add(targetAttribs);
for (String annotationType : metadata.getAnnotationTypes()) {
getImports(annotationType, imports, visited);
}
}
AnnotationAttributes localAttribs =
AnnotationAttributes.fromMap(metadata.getAnnotationAttributes(targetAnnotationType, classValuesAsString));
if (localAttribs != null) {
allAttribs.add(localAttribs);
}
return allAttribs;
return imports;
}
private void processImport(ConfigurationClass configClass, String[] classesToImport, boolean checkForCircularImports) throws IOException {
@@ -440,5 +429,4 @@ class ConfigurationClassParser {
new Location(importStack.peek().getResource(), metadata));
}
}
}