/*
* Copyright 2002-2010 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.beans.factory;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.springframework.beans.BeansException;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Convenience methods operating on bean factories, in particular
* on the {@link ListableBeanFactory} interface.
*
* <p>Returns bean counts, bean names or bean instances,
* taking into account the nesting hierarchy of a bean factory
* (which the methods defined on the ListableBeanFactory interface don't,
* in contrast to the methods defined on the BeanFactory interface).
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 04.07.2003
*/
public abstract class BeanFactoryUtils {
/**
* Separator for generated bean names. If a class name or parent name is not
* unique, "#1", "#2" etc will be appended, until the name becomes unique.
*/
public static final String GENERATED_BEAN_NAME_SEPARATOR = "#";
/**
* Return whether the given name is a factory dereference
* (beginning with the factory dereference prefix).
* @param name the name of the bean
* @return whether the given name is a factory dereference
* @see BeanFactory#FACTORY_BEAN_PREFIX
*/
public static boolean isFactoryDereference(String name) {
return (name != null && name.startsWith(BeanFactory.FACTORY_BEAN_PREFIX));
}
/**
* Return the actual bean name, stripping out the factory dereference
* prefix (if any, also stripping repeated factory prefixes if found).
* @param name the name of the bean
* @return the transformed name
* @see BeanFactory#FACTORY_BEAN_PREFIX
*/
public static String transformedBeanName(String name) {
Assert.notNull(name, "'name' must not be null");
String beanName = name;
while (beanName.startsWith(BeanFactory.FACTORY_BEAN_PREFIX)) {
beanName = beanName.substring(BeanFactory.FACTORY_BEAN_PREFIX.length());
}
return beanName;
}
/**
* Return whether the given name is a bean name which has been generated
* by the default naming strategy (containing a "#..." part).
* @param name the name of the bean
* @return whether the given name is a generated bean name
* @see #GENERATED_BEAN_NAME_SEPARATOR
* @see org.springframework.beans.factory.support.BeanDefinitionReaderUtils#generateBeanName
* @see org.springframework.beans.factory.support.DefaultBeanNameGenerator
*/
public static boolean isGeneratedBeanName(String name) {
return (name != null && name.contains(GENERATED_BEAN_NAME_SEPARATOR));
}
/**
* Extract the "raw" bean name from the given (potentially generated) bean name,
* excluding any "#..." suffixes which might have been added for uniqueness.
* @param name the potentially generated bean name
* @return the raw bean name
* @see #GENERATED_BEAN_NAME_SEPARATOR
*/
public static String originalBeanName(String name) {
Assert.notNull(name, "'name' must not be null");
int separatorIndex = name.indexOf(GENERATED_BEAN_NAME_SEPARATOR);
return (separatorIndex != -1 ? name.substring(0, separatorIndex) : name);
}
/**
* Count all beans in any hierarchy in which this factory participates.
* Includes counts of ancestor bean factories.
* <p>Beans that are "overridden" (specified in a descendant factory
* with the same name) are only counted once.
* @param lbf the bean factory
* @return count of beans including those defined in ancestor factories
*/
public static int countBeansIncludingAncestors(ListableBeanFactory lbf) {
return beanNamesIncludingAncestors(lbf).length;
}
/**
* Return all bean names in the factory, including ancestor factories.
* @param lbf the bean factory
* @return the array of matching bean names, or an empty array if none
* @see #beanNamesForTypeIncludingAncestors
*/
public static String[] beanNamesIncludingAncestors(ListableBeanFactory lbf) {
return beanNamesForTypeIncludingAncestors(lbf, Object.class);
}
/**
* Get all bean names for the given type, including those defined in ancestor
* factories. Will return unique names in case of overridden bean definitions.
* <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
* will get initialized. If the object created by the FactoryBean doesn't match,
* the raw FactoryBean itself will be matched against the type.
* <p>This version of <code>beanNamesForTypeIncludingAncestors</code> automatically
* includes prototypes and FactoryBeans.
* @param lbf the bean factory
* @param type the type that beans must match
* @return the array of matching bean names, or an empty array if none
*/
public static String[] beanNamesForTypeIncludingAncestors(ListableBeanFactory lbf, Class type) {
Assert.notNull(lbf, "ListableBeanFactory must not be null");
String[] result = lbf.getBeanNamesForType(type);
if (lbf instanceof HierarchicalBeanFactory) {
HierarchicalBeanFactory hbf = (HierarchicalBeanFactory) lbf;
if (hbf.getParentBeanFactory() instanceof ListableBeanFactory) {
String[] parentResult = beanNamesForTypeIncludingAncestors(
(ListableBeanFactory) hbf.getParentBeanFactory(), type);
List<String> resultList = new ArrayList<String>();
resultList.addAll(Arrays.asList(result));
for (String beanName : parentResult) {
if (!resultList.contains(beanName) && !hbf.containsLocalBean(beanName)) {
resultList.add(beanName);
}
}
result = StringUtils.toStringArray(resultList);
}
}
return result;
}
/**
* Get all bean names for the given type, including those defined in ancestor
* factories. Will return unique names in case of overridden bean definitions.
* <p>Does consider objects created by FactoryBeans if the "allowEagerInit"
* flag is set, which means that FactoryBeans will get initialized. If the
* object created by the FactoryBean doesn't match, the raw FactoryBean itself
* will be matched against the type. If "allowEagerInit" is not set,
* only raw FactoryBeans will be checked (which doesn't require initialization
* of each FactoryBean).
* @param lbf the bean factory
* @param includeNonSingletons whether to include prototype or scoped beans too
* or just singletons (also applies to FactoryBeans)
* @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
* <i>objects created by FactoryBeans</i> (or by factory methods with a
* "factory-bean" reference) for the type check. Note that FactoryBeans need to be
* eagerly initialized to determine their type: So be aware that passing in "true"
* for this flag will initialize FactoryBeans and "factory-bean" references.
* @param type the type that beans must match
* @return the array of matching bean names, or an empty array if none
*/
public static String[] beanNamesForTypeIncludingAncestors(
ListableBeanFactory lbf, Class type, boolean includeNonSingletons, boolean allowEagerInit) {
Assert.notNull(lbf, "ListableBeanFactory must not be null");
String[] result = lbf.getBeanNamesForType(type, includeNonSingletons, allowEagerInit);
if (lbf instanceof HierarchicalBeanFactory) {
HierarchicalBeanFactory hbf = (HierarchicalBeanFactory) lbf;
if (hbf.getParentBeanFactory() instanceof ListableBeanFactory) {
String[] parentResult = beanNamesForTypeIncludingAncestors(
(ListableBeanFactory) hbf.getParentBeanFactory(), type, includeNonSingletons, allowEagerInit);
List<String> resultList = new ArrayList<String>();
resultList.addAll(Arrays.asList(result));
for (String beanName : parentResult) {
if (!resultList.contains(beanName) && !hbf.containsLocalBean(beanName)) {
resultList.add(beanName);
}
}
result = StringUtils.toStringArray(resultList);
}
}
return result;
}
/**
* Return all beans of the given type or subtypes, also picking up beans defined in
* ancestor bean factories if the current bean factory is a HierarchicalBeanFactory.
* The returned Map will only contain beans of this type.
* <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
* will get initialized. If the object created by the FactoryBean doesn't match,
* the raw FactoryBean itself will be matched against the type.
* <p><b>Note: Beans of the same name will take precedence at the 'lowest' factory level,
* i.e. such beans will be returned from the lowest factory that they are being found in,
* hiding corresponding beans in ancestor factories.</b> This feature allows for
* 'replacing' beans by explicitly choosing the same bean name in a child factory;
* the bean in the ancestor factory won't be visible then, not even for by-type lookups.
* @param lbf the bean factory
* @param type type of bean to match
* @return the Map of matching bean instances, or an empty Map if none
* @throws BeansException if a bean could not be created
*/
public static <T> Map<String, T> beansOfTypeIncludingAncestors(ListableBeanFactory lbf, Class<T> type)
throws BeansException {
Assert.notNull(lbf, "ListableBeanFactory must not be null");
Map<String, T> result = new LinkedHashMap<String, T>(4);
result.putAll(lbf.getBeansOfType(type));
if (lbf instanceof HierarchicalBeanFactory) {
HierarchicalBeanFactory hbf = (HierarchicalBeanFactory) lbf;
if (hbf.getParentBeanFactory() instanceof ListableBeanFactory) {
Map<String, T> parentResult = beansOfTypeIncludingAncestors(
(ListableBeanFactory) hbf.getParentBeanFactory(), type);
for (Map.Entry<String, T> entry : parentResult.entrySet()) {
String beanName = entry.getKey();
if (!result.containsKey(beanName) && !hbf.containsLocalBean(beanName)) {
result.put(beanName, entry.getValue());
}
}
}
}
return result;
}
/**
* Return all beans of the given type or subtypes, also picking up beans defined in
* ancestor bean factories if the current bean factory is a HierarchicalBeanFactory.
* The returned Map will only contain beans of this type.
* <p>Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
* which means that FactoryBeans will get initialized. If the object created by the
* FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
* type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
* (which doesn't require initialization of each FactoryBean).
* <p><b>Note: Beans of the same name will take precedence at the 'lowest' factory level,
* i.e. such beans will be returned from the lowest factory that they are being found in,
* hiding corresponding beans in ancestor factories.</b> This feature allows for
* 'replacing' beans by explicitly choosing the same bean name in a child factory;
* the bean in the ancestor factory won't be visible then, not even for by-type lookups.
* @param lbf the bean factory
* @param type type of bean to match
* @param includeNonSingletons whether to include prototype or scoped beans too
* or just singletons (also applies to FactoryBeans)
* @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
* <i>objects created by FactoryBeans</i> (or by factory methods with a
* "factory-bean" reference) for the type check. Note that FactoryBeans need to be
* eagerly initialized to determine their type: So be aware that passing in "true"
* for this flag will initialize FactoryBeans and "factory-bean" references.
* @return the Map of matching bean instances, or an empty Map if none
* @throws BeansException if a bean could not be created
*/
public static <T> Map<String, T> beansOfTypeIncludingAncestors(
ListableBeanFactory lbf, Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
throws BeansException {
Assert.notNull(lbf, "ListableBeanFactory must not be null");
Map<String, T> result = new LinkedHashMap<String, T>(4);
result.putAll(lbf.getBeansOfType(type, includeNonSingletons, allowEagerInit));
if (lbf instanceof HierarchicalBeanFactory) {
HierarchicalBeanFactory hbf = (HierarchicalBeanFactory) lbf;
if (hbf.getParentBeanFactory() instanceof ListableBeanFactory) {
Map<String, T> parentResult = beansOfTypeIncludingAncestors(
(ListableBeanFactory) hbf.getParentBeanFactory(), type, includeNonSingletons, allowEagerInit);
for (Map.Entry<String, T> entry : parentResult.entrySet()) {
String beanName = entry.getKey();
if (!result.containsKey(beanName) && !hbf.containsLocalBean(beanName)) {
result.put(beanName, entry.getValue());
}
}
}
}
return result;
}
/**
* Return a single bean of the given type or subtypes, also picking up beans
* defined in ancestor bean factories if the current bean factory is a
* HierarchicalBeanFactory. Useful convenience method when we expect a
* single bean and don't care about the bean name.
* <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
* will get initialized. If the object created by the FactoryBean doesn't match,
* the raw FactoryBean itself will be matched against the type.
* <p>This version of <code>beanOfTypeIncludingAncestors</code> automatically includes
* prototypes and FactoryBeans.
* <p><b>Note: Beans of the same name will take precedence at the 'lowest' factory level,
* i.e. such beans will be returned from the lowest factory that they are being found in,
* hiding corresponding beans in ancestor factories.</b> This feature allows for
* 'replacing' beans by explicitly choosing the same bean name in a child factory;
* the bean in the ancestor factory won't be visible then, not even for by-type lookups.
* @param lbf the bean factory
* @param type type of bean to match
* @return the matching bean instance
* @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
* if 0 or more than 1 beans of the given type were found
* @throws BeansException if the bean could not be created
*/
public static <T> T beanOfTypeIncludingAncestors(ListableBeanFactory lbf, Class<T> type)
throws BeansException {
Map<String, T> beansOfType = beansOfTypeIncludingAncestors(lbf, type);
if (beansOfType.size() == 1) {
return beansOfType.values().iterator().next();
}
else {
throw new NoSuchBeanDefinitionException(type, "expected single bean but found " + beansOfType.size());
}
}
/**
* Return a single bean of the given type or subtypes, also picking up beans
* defined in ancestor bean factories if the current bean factory is a
* HierarchicalBeanFactory. Useful convenience method when we expect a
* single bean and don't care about the bean name.
* <p>Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
* which means that FactoryBeans will get initialized. If the object created by the
* FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
* type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
* (which doesn't require initialization of each FactoryBean).
* <p><b>Note: Beans of the same name will take precedence at the 'lowest' factory level,
* i.e. such beans will be returned from the lowest factory that they are being found in,
* hiding corresponding beans in ancestor factories.</b> This feature allows for
* 'replacing' beans by explicitly choosing the same bean name in a child factory;
* the bean in the ancestor factory won't be visible then, not even for by-type lookups.
* @param lbf the bean factory
* @param type type of bean to match
* @param includeNonSingletons whether to include prototype or scoped beans too
* or just singletons (also applies to FactoryBeans)
* @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
* <i>objects created by FactoryBeans</i> (or by factory methods with a
* "factory-bean" reference) for the type check. Note that FactoryBeans need to be
* eagerly initialized to determine their type: So be aware that passing in "true"
* for this flag will initialize FactoryBeans and "factory-bean" references.
* @return the matching bean instance
* @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
* if 0 or more than 1 beans of the given type were found
* @throws BeansException if the bean could not be created
*/
public static <T> T beanOfTypeIncludingAncestors(
ListableBeanFactory lbf, Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
throws BeansException {
Map<String, T> beansOfType = beansOfTypeIncludingAncestors(lbf, type, includeNonSingletons, allowEagerInit);
if (beansOfType.size() == 1) {
return beansOfType.values().iterator().next();
}
else {
throw new NoSuchBeanDefinitionException(type, "expected single bean but found " + beansOfType.size());
}
}
/**
* Return a single bean of the given type or subtypes, not looking in ancestor
* factories. Useful convenience method when we expect a single bean and
* don't care about the bean name.
* <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
* will get initialized. If the object created by the FactoryBean doesn't match,
* the raw FactoryBean itself will be matched against the type.
* <p>This version of <code>beanOfType</code> automatically includes
* prototypes and FactoryBeans.
* @param lbf the bean factory
* @param type type of bean to match
* @return the matching bean instance
* @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
* if 0 or more than 1 beans of the given type were found
* @throws BeansException if the bean could not be created
*/
public static <T> T beanOfType(ListableBeanFactory lbf, Class<T> type) throws BeansException {
Assert.notNull(lbf, "ListableBeanFactory must not be null");
Map<String, T> beansOfType = lbf.getBeansOfType(type);
if (beansOfType.size() == 1) {
return beansOfType.values().iterator().next();
}
else {
throw new NoSuchBeanDefinitionException(type, "expected single bean but found " + beansOfType.size());
}
}
/**
* Return a single bean of the given type or subtypes, not looking in ancestor
* factories. Useful convenience method when we expect a single bean and
* don't care about the bean name.
* <p>Does consider objects created by FactoryBeans if the "allowEagerInit"
* flag is set, which means that FactoryBeans will get initialized. If the
* object created by the FactoryBean doesn't match, the raw FactoryBean itself
* will be matched against the type. If "allowEagerInit" is not set,
* only raw FactoryBeans will be checked (which doesn't require initialization
* of each FactoryBean).
* @param lbf the bean factory
* @param type type of bean to match
* @param includeNonSingletons whether to include prototype or scoped beans too
* or just singletons (also applies to FactoryBeans)
* @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
* <i>objects created by FactoryBeans</i> (or by factory methods with a
* "factory-bean" reference) for the type check. Note that FactoryBeans need to be
* eagerly initialized to determine their type: So be aware that passing in "true"
* for this flag will initialize FactoryBeans and "factory-bean" references.
* @return the matching bean instance
* @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
* if 0 or more than 1 beans of the given type were found
* @throws BeansException if the bean could not be created
*/
public static <T> T beanOfType(
ListableBeanFactory lbf, Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
throws BeansException {
Assert.notNull(lbf, "ListableBeanFactory must not be null");
Map<String, T> beansOfType = lbf.getBeansOfType(type, includeNonSingletons, allowEagerInit);
if (beansOfType.size() == 1) {
return beansOfType.values().iterator().next();
}
else {
throw new NoSuchBeanDefinitionException(type, "expected single bean but found " + beansOfType.size());
}
}
}
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