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/*
* Copyright 2002-2012 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
*
* 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.springframework.context.annotation;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
/**
* Simple {@link ScopeMetadataResolver} implementation that follows JSR-330 scoping rules:
* defaulting to prototype scope unless {@link javax.inject.Singleton} is present.
*
* <p>This scope resolver can be used with {@link ClassPathBeanDefinitionScanner} and
* {@link AnnotatedBeanDefinitionReader} for standard JSR-330 compliance. However,
* in practice, you will typically use Spring's rich default scoping instead - or extend
* this resolver with custom scoping annotations that point to extended Spring scopes.
*
* @author Juergen Hoeller
* @since 3.0
* @see #registerScope
* @see #resolveScopeName
* @see ClassPathBeanDefinitionScanner#setScopeMetadataResolver
* @see AnnotatedBeanDefinitionReader#setScopeMetadataResolver
*/
public class Jsr330ScopeMetadataResolver implements ScopeMetadataResolver {
private final Map<String, String> scopeMap = new HashMap<String, String>();
public Jsr330ScopeMetadataResolver() {
registerScope("javax.inject.Singleton", BeanDefinition.SCOPE_SINGLETON);
}
/**
* Register an extended JSR-330 scope annotation, mapping it onto a
* specific Spring scope by name.
* @param annotationType the JSR-330 annotation type as a Class
* @param scopeName the Spring scope name
*/
public final void registerScope(Class<?> annotationType, String scopeName) {
this.scopeMap.put(annotationType.getName(), scopeName);
}
/**
* Register an extended JSR-330 scope annotation, mapping it onto a
* specific Spring scope by name.
* @param annotationType the JSR-330 annotation type by name
* @param scopeName the Spring scope name
*/
public final void registerScope(String annotationType, String scopeName) {
this.scopeMap.put(annotationType, scopeName);
}
/**
* Resolve the given annotation type into a named Spring scope.
* <p>The default implementation simply checks against registered scopes.
* Can be overridden for custom mapping rules, e.g. naming conventions.
* @param annotationType the JSR-330 annotation type
* @return the Spring scope name
*/
protected String resolveScopeName(String annotationType) {
return this.scopeMap.get(annotationType);
}
@Override
public ScopeMetadata resolveScopeMetadata(BeanDefinition definition) {
ScopeMetadata metadata = new ScopeMetadata();
metadata.setScopeName(BeanDefinition.SCOPE_PROTOTYPE);
if (definition instanceof AnnotatedBeanDefinition) {
AnnotatedBeanDefinition annDef = (AnnotatedBeanDefinition) definition;
Set<String> annTypes = annDef.getMetadata().getAnnotationTypes();
String found = null;
for (String annType : annTypes) {
Set<String> metaAnns = annDef.getMetadata().getMetaAnnotationTypes(annType);
if (metaAnns.contains("javax.inject.Scope")) {
if (found != null) {
throw new IllegalStateException("Found ambiguous scope annotations on bean class [" +
definition.getBeanClassName() + "]: " + found + ", " + annType);
}
found = annType;
String scopeName = resolveScopeName(annType);
if (scopeName == null) {
throw new IllegalStateException(
"Unsupported scope annotation - not mapped onto Spring scope name: " + annType);
}
metadata.setScopeName(scopeName);
}
}
}
return metadata;
}
}
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