Java Code Examples for org.springframework.beans.factory.config.DependencyDescriptor#getDependencyType()

The following examples show how to use org.springframework.beans.factory.config.DependencyDescriptor#getDependencyType() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: DefaultListableBeanFactory.java From spring-analysis-note with MIT License

6 votes

@Override
@Nullable
public Object resolveDependency(DependencyDescriptor descriptor, @Nullable String requestingBeanName,
		@Nullable Set<String> autowiredBeanNames, @Nullable TypeConverter typeConverter) throws BeansException {

	descriptor.initParameterNameDiscovery(getParameterNameDiscoverer());
	if (Optional.class == descriptor.getDependencyType()) {
		return createOptionalDependency(descriptor, requestingBeanName);
	}
	else if (ObjectFactory.class == descriptor.getDependencyType() ||
			ObjectProvider.class == descriptor.getDependencyType()) {
		return new DependencyObjectProvider(descriptor, requestingBeanName);
	}
	else if (javaxInjectProviderClass == descriptor.getDependencyType()) {
		return new Jsr330Factory().createDependencyProvider(descriptor, requestingBeanName);
	}
	else {
		Object result = getAutowireCandidateResolver().getLazyResolutionProxyIfNecessary(
				descriptor, requestingBeanName);
		if (result == null) {
			result = doResolveDependency(descriptor, requestingBeanName, autowiredBeanNames, typeConverter);
		}
		return result;
	}
}

Example 2

Source File: DefaultListableBeanFactory.java From spring-analysis-note with MIT License

6 votes

/**
 * Determine the autowire candidate in the given set of beans.
 * <p>Looks for {@code @Primary} and {@code @Priority} (in that order).
 * @param candidates a Map of candidate names and candidate instances
 * that match the required type, as returned by {@link #findAutowireCandidates}
 * @param descriptor the target dependency to match against
 * @return the name of the autowire candidate, or {@code null} if none found
 */
@Nullable
protected String determineAutowireCandidate(Map<String, Object> candidates, DependencyDescriptor descriptor) {
	Class<?> requiredType = descriptor.getDependencyType();
	String primaryCandidate = determinePrimaryCandidate(candidates, requiredType);
	if (primaryCandidate != null) {
		return primaryCandidate;
	}
	String priorityCandidate = determineHighestPriorityCandidate(candidates, requiredType);
	if (priorityCandidate != null) {
		return priorityCandidate;
	}
	// Fallback
	for (Map.Entry<String, Object> entry : candidates.entrySet()) {
		String candidateName = entry.getKey();
		Object beanInstance = entry.getValue();
		if ((beanInstance != null && this.resolvableDependencies.containsValue(beanInstance)) ||
				matchesBeanName(candidateName, descriptor.getDependencyName())) {
			return candidateName;
		}
	}
	return null;
}

Example 3

Source File: DefaultListableBeanFactory.java From java-technology-stack with MIT License

6 votes

@Override
@Nullable
public Object resolveDependency(DependencyDescriptor descriptor, @Nullable String requestingBeanName,
		@Nullable Set<String> autowiredBeanNames, @Nullable TypeConverter typeConverter) throws BeansException {

	descriptor.initParameterNameDiscovery(getParameterNameDiscoverer());
	if (Optional.class == descriptor.getDependencyType()) {
		return createOptionalDependency(descriptor, requestingBeanName);
	}
	else if (ObjectFactory.class == descriptor.getDependencyType() ||
			ObjectProvider.class == descriptor.getDependencyType()) {
		return new DependencyObjectProvider(descriptor, requestingBeanName);
	}
	else if (javaxInjectProviderClass == descriptor.getDependencyType()) {
		return new Jsr330Factory().createDependencyProvider(descriptor, requestingBeanName);
	}
	else {
		Object result = getAutowireCandidateResolver().getLazyResolutionProxyIfNecessary(
				descriptor, requestingBeanName);
		if (result == null) {
			result = doResolveDependency(descriptor, requestingBeanName, autowiredBeanNames, typeConverter);
		}
		return result;
	}
}

Example 4

Source File: DefaultListableBeanFactory.java From kfs with GNU Affero General Public License v3.0

6 votes

@Override
   public boolean isAutowireCandidate(String beanName, DependencyDescriptor descriptor)
		throws NoSuchBeanDefinitionException {

	// Consider FactoryBeans as autowiring candidates.
	boolean isFactoryBean = (descriptor != null && descriptor.getDependencyType() != null &&
			FactoryBean.class.isAssignableFrom(descriptor.getDependencyType()));
	if (isFactoryBean) {
		beanName = BeanFactoryUtils.transformedBeanName(beanName);
	}

	if (containsBeanDefinition(beanName)) {
		return isAutowireCandidate(beanName, getMergedLocalBeanDefinition(beanName), descriptor);
	}
	else if (containsSingleton(beanName)) {
		return isAutowireCandidate(beanName, new RootBeanDefinition(getType(beanName)), descriptor);
	}
	else if (getParentBeanFactory() instanceof ConfigurableListableBeanFactory) {
		// No bean definition found in this factory -> delegate to parent.
		return ((ConfigurableListableBeanFactory) getParentBeanFactory()).isAutowireCandidate(beanName, descriptor);
	}
	else {
		return true;
	}
}

Example 5

Source File: DefaultListableBeanFactory.java From java-technology-stack with MIT License

6 votes

/**
 * Determine the autowire candidate in the given set of beans.
 * <p>Looks for {@code @Primary} and {@code @Priority} (in that order).
 * @param candidates a Map of candidate names and candidate instances
 * that match the required type, as returned by {@link #findAutowireCandidates}
 * @param descriptor the target dependency to match against
 * @return the name of the autowire candidate, or {@code null} if none found
 */
@Nullable
protected String determineAutowireCandidate(Map<String, Object> candidates, DependencyDescriptor descriptor) {
	Class<?> requiredType = descriptor.getDependencyType();
	String primaryCandidate = determinePrimaryCandidate(candidates, requiredType);
	if (primaryCandidate != null) {
		return primaryCandidate;
	}
	String priorityCandidate = determineHighestPriorityCandidate(candidates, requiredType);
	if (priorityCandidate != null) {
		return priorityCandidate;
	}
	// Fallback
	for (Map.Entry<String, Object> entry : candidates.entrySet()) {
		String candidateName = entry.getKey();
		Object beanInstance = entry.getValue();
		if ((beanInstance != null && this.resolvableDependencies.containsValue(beanInstance)) ||
				matchesBeanName(candidateName, descriptor.getDependencyName())) {
			return candidateName;
		}
	}
	return null;
}

Example 6

Source File: DefaultListableBeanFactory.java From lams with GNU General Public License v2.0

6 votes

@Override
public Object resolveDependency(DependencyDescriptor descriptor, String requestingBeanName,
		Set<String> autowiredBeanNames, TypeConverter typeConverter) throws BeansException {

	descriptor.initParameterNameDiscovery(getParameterNameDiscoverer());
	if (javaUtilOptionalClass == descriptor.getDependencyType()) {
		return new OptionalDependencyFactory().createOptionalDependency(descriptor, requestingBeanName);
	}
	else if (ObjectFactory.class == descriptor.getDependencyType() ||
			ObjectProvider.class == descriptor.getDependencyType()) {
		return new DependencyObjectProvider(descriptor, requestingBeanName);
	}
	else if (javaxInjectProviderClass == descriptor.getDependencyType()) {
		return new Jsr330ProviderFactory().createDependencyProvider(descriptor, requestingBeanName);
	}
	else {
		Object result = getAutowireCandidateResolver().getLazyResolutionProxyIfNecessary(
				descriptor, requestingBeanName);
		if (result == null) {
			result = doResolveDependency(descriptor, requestingBeanName, autowiredBeanNames, typeConverter);
		}
		return result;
	}
}

Example 7

Source File: DefaultListableBeanFactory.java From lams with GNU General Public License v2.0

6 votes

/**
 * Determine the autowire candidate in the given set of beans.
 * <p>Looks for {@code @Primary} and {@code @Priority} (in that order).
 * @param candidates a Map of candidate names and candidate instances
 * that match the required type, as returned by {@link #findAutowireCandidates}
 * @param descriptor the target dependency to match against
 * @return the name of the autowire candidate, or {@code null} if none found
 */
protected String determineAutowireCandidate(Map<String, Object> candidates, DependencyDescriptor descriptor) {
	Class<?> requiredType = descriptor.getDependencyType();
	String primaryCandidate = determinePrimaryCandidate(candidates, requiredType);
	if (primaryCandidate != null) {
		return primaryCandidate;
	}
	String priorityCandidate = determineHighestPriorityCandidate(candidates, requiredType);
	if (priorityCandidate != null) {
		return priorityCandidate;
	}
	// Fallback
	for (Map.Entry<String, Object> entry : candidates.entrySet()) {
		String candidateName = entry.getKey();
		Object beanInstance = entry.getValue();
		if ((beanInstance != null && this.resolvableDependencies.containsValue(beanInstance)) ||
				matchesBeanName(candidateName, descriptor.getDependencyName())) {
			return candidateName;
		}
	}
	return null;
}

Example 8

Source File: ProviderAwareListableBeanFactory.java From arctic-sea with Apache License 2.0

6 votes

@Override
protected Map<String, Object> findAutowireCandidates(String beanName, Class<?> requiredType,
                                                     DependencyDescriptor descriptor) {

    if (!requiredType.equals(Provider.class)) {
        return super.findAutowireCandidates(beanName, requiredType, descriptor);
    }

    DependencyDescriptor providedDescriptor = new DependencyDescriptor(descriptor);
    providedDescriptor.increaseNestingLevel();
    Class<?> type = providedDescriptor.getDependencyType();
    Set<String> candidates = findAutowireCandidates(beanName, type, providedDescriptor).keySet();
    return candidates.stream()
            .collect(toMap(Function.identity(), name -> new DependencyProvider(this, descriptor, name)));

}

Example 9

Source File: CubaDefaultListableBeanFactory.java From cuba with Apache License 2.0

6 votes

@Override
public Object resolveDependency(DependencyDescriptor descriptor, String beanName, Set<String> autowiredBeanNames,
                                TypeConverter typeConverter) throws BeansException {
    Field field = descriptor.getField();

    if (field != null && Logger.class == descriptor.getDependencyType()) {
        return LoggerFactory.getLogger(getDeclaringClass(descriptor));
    }

    if (field != null && Config.class.isAssignableFrom(field.getType())) {
        return getConfig(field.getType());
    }
    MethodParameter methodParam = descriptor.getMethodParameter();
    if (methodParam != null && Config.class.isAssignableFrom(methodParam.getParameterType())) {
        return getConfig(methodParam.getParameterType());
    }
    return super.resolveDependency(descriptor, beanName, autowiredBeanNames, typeConverter);
}

Example 10

Source File: DefaultListableBeanFactory.java From spring4-understanding with Apache License 2.0

6 votes

/**
 * Determine the autowire candidate in the given set of beans.
 * <p>Looks for {@code @Primary} and {@code @Priority} (in that order).
 * @param candidateBeans a Map of candidate names and candidate instances
 * that match the required type, as returned by {@link #findAutowireCandidates}
 * @param descriptor the target dependency to match against
 * @return the name of the autowire candidate, or {@code null} if none found
 */
protected String determineAutowireCandidate(Map<String, Object> candidateBeans, DependencyDescriptor descriptor) {
	Class<?> requiredType = descriptor.getDependencyType();
	String primaryCandidate = determinePrimaryCandidate(candidateBeans, requiredType);
	if (primaryCandidate != null) {
		return primaryCandidate;
	}
	String priorityCandidate = determineHighestPriorityCandidate(candidateBeans, requiredType);
	if (priorityCandidate != null) {
		return priorityCandidate;
	}
	// Fallback
	for (Map.Entry<String, Object> entry : candidateBeans.entrySet()) {
		String candidateBeanName = entry.getKey();
		Object beanInstance = entry.getValue();
		if ((beanInstance != null && this.resolvableDependencies.containsValue(beanInstance)) ||
				matchesBeanName(candidateBeanName, descriptor.getDependencyName())) {
			return candidateBeanName;
		}
	}
	return null;
}

Example 11

Source File: DefaultListableBeanFactory.java From spring4-understanding with Apache License 2.0

6 votes

@Override
public Object resolveDependency(DependencyDescriptor descriptor, String beanName,
		Set<String> autowiredBeanNames, TypeConverter typeConverter) throws BeansException {

	descriptor.initParameterNameDiscovery(getParameterNameDiscoverer());
	if (descriptor.getDependencyType().equals(javaUtilOptionalClass)) {
		return new OptionalDependencyFactory().createOptionalDependency(descriptor, beanName);
	}
	else if (ObjectFactory.class == descriptor.getDependencyType()) {
		return new DependencyObjectFactory(descriptor, beanName);
	}
	else if (javaxInjectProviderClass == descriptor.getDependencyType()) {
		return new DependencyProviderFactory().createDependencyProvider(descriptor, beanName);
	}
	else {
		Object result = getAutowireCandidateResolver().getLazyResolutionProxyIfNecessary(descriptor, beanName);
		if (result == null) {
			result = doResolveDependency(descriptor, beanName, autowiredBeanNames, typeConverter);
		}
		return result;
	}
}

Example 12

Source File: DefaultListableBeanFactory.java From kfs with GNU Affero General Public License v3.0

5 votes

/**
 * Determine the primary autowire candidate in the given set of beans.
 * @param candidateBeans a Map of candidate names and candidate instances
 * that match the required type, as returned by {@link #findAutowireCandidates}
 * @param descriptor the target dependency to match against
 * @return the name of the primary candidate, or <code>null</code> if none found
 */
protected String determinePrimaryCandidate(Map<String, Object> candidateBeans, DependencyDescriptor descriptor) {
	String primaryBeanName = null;
	String fallbackBeanName = null;
	for (Map.Entry<String, Object> entry : candidateBeans.entrySet()) {
		String candidateBeanName = entry.getKey();
		Object beanInstance = entry.getValue();
		if (isPrimary(candidateBeanName, beanInstance)) {
			if (primaryBeanName != null) {
				boolean candidateLocal = containsBeanDefinition(candidateBeanName);
				boolean primaryLocal = containsBeanDefinition(primaryBeanName);
				if (candidateLocal == primaryLocal) {
					throw new NoSuchBeanDefinitionException(descriptor.getDependencyType(),
							"more than one 'primary' bean found among candidates: " + candidateBeans.keySet());
				}
				else if (candidateLocal && !primaryLocal) {
					primaryBeanName = candidateBeanName;
				}
			}
			else {
				primaryBeanName = candidateBeanName;
			}
		}
		if (primaryBeanName == null &&
				(this.resolvableDependencies.values().contains(beanInstance) ||
						matchesBeanName(candidateBeanName, descriptor.getDependencyName()))) {
			fallbackBeanName = candidateBeanName;
		}
	}
	return (primaryBeanName != null ? primaryBeanName : fallbackBeanName);
}

Example 13

Source File: ContextAnnotationAutowireCandidateResolver.java From Ratel with Apache License 2.0

5 votes

protected Object buildLazyResolutionProxy(final DependencyDescriptor descriptor, final String beanName) {
    Assert.state(getBeanFactory() instanceof DefaultListableBeanFactory,
            "BeanFactory needs to be a DefaultListableBeanFactory");
    final DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory) getBeanFactory();
    TargetSource ts = new TargetSource() {
        @Override
        public Class<?> getTargetClass() {
            return descriptor.getDependencyType();
        }

        @Override
        public boolean isStatic() {
            return false;
        }

        @Override
        public Object getTarget() {
            return beanFactory.doResolveDependency(descriptor, beanName, null, null);
        }

        @Override
        public void releaseTarget(Object target) {
        }
    };
    ProxyFactory pf = new ProxyFactory();
    pf.setTargetSource(ts);
    Class<?> dependencyType = descriptor.getDependencyType();
    if (dependencyType.isInterface()) {
        pf.addInterface(dependencyType);
    }
    return pf.getProxy(beanFactory.getBeanClassLoader());
}

Example 14

Source File: ContextAnnotationAutowireCandidateResolver.java From spring4-understanding with Apache License 2.0

5 votes

protected Object buildLazyResolutionProxy(final DependencyDescriptor descriptor, final String beanName) {
	Assert.state(getBeanFactory() instanceof DefaultListableBeanFactory,
			"BeanFactory needs to be a DefaultListableBeanFactory");
	final DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory) getBeanFactory();
	TargetSource ts = new TargetSource() {
		@Override
		public Class<?> getTargetClass() {
			return descriptor.getDependencyType();
		}
		@Override
		public boolean isStatic() {
			return false;
		}
		@Override
		public Object getTarget() {
			return beanFactory.doResolveDependency(descriptor, beanName, null, null);
		}
		@Override
		public void releaseTarget(Object target) {
		}
	};
	ProxyFactory pf = new ProxyFactory();
	pf.setTargetSource(ts);
	Class<?> dependencyType = descriptor.getDependencyType();
	if (dependencyType.isInterface()) {
		pf.addInterface(dependencyType);
	}
	return pf.getProxy(beanFactory.getBeanClassLoader());
}

Example 15

Source File: DefaultListableBeanFactory.java From blog_demos with Apache License 2.0

5 votes

/**
 * Determine the primary autowire candidate in the given set of beans.
 * @param candidateBeans a Map of candidate names and candidate instances
 * that match the required type, as returned by {@link #findAutowireCandidates}
 * @param descriptor the target dependency to match against
 * @return the name of the primary candidate, or {@code null} if none found
 */
protected String determinePrimaryCandidate(Map<String, Object> candidateBeans, DependencyDescriptor descriptor) {
	String primaryBeanName = null;
	String fallbackBeanName = null;
	for (Map.Entry<String, Object> entry : candidateBeans.entrySet()) {
		String candidateBeanName = entry.getKey();
		Object beanInstance = entry.getValue();
		if (isPrimary(candidateBeanName, beanInstance)) {
			if (primaryBeanName != null) {
				boolean candidateLocal = containsBeanDefinition(candidateBeanName);
				boolean primaryLocal = containsBeanDefinition(primaryBeanName);
				if (candidateLocal == primaryLocal) {
					throw new NoUniqueBeanDefinitionException(descriptor.getDependencyType(), candidateBeans.size(),
							"more than one 'primary' bean found among candidates: " + candidateBeans.keySet());
				}
				else if (candidateLocal && !primaryLocal) {
					primaryBeanName = candidateBeanName;
				}
			}
			else {
				primaryBeanName = candidateBeanName;
			}
		}
		if (primaryBeanName == null &&
				(this.resolvableDependencies.values().contains(beanInstance) ||
						matchesBeanName(candidateBeanName, descriptor.getDependencyName()))) {
			fallbackBeanName = candidateBeanName;
		}
	}
	return (primaryBeanName != null ? primaryBeanName : fallbackBeanName);
}

Example 16

Source File: DefaultListableBeanFactory.java From lams with GNU General Public License v2.0

4 votes

public Object doResolveDependency(DependencyDescriptor descriptor, String beanName,
		Set<String> autowiredBeanNames, TypeConverter typeConverter) throws BeansException {

	InjectionPoint previousInjectionPoint = ConstructorResolver.setCurrentInjectionPoint(descriptor);
	try {
		Object shortcut = descriptor.resolveShortcut(this);
		if (shortcut != null) {
			return shortcut;
		}

		Class<?> type = descriptor.getDependencyType();
		Object value = getAutowireCandidateResolver().getSuggestedValue(descriptor);
		if (value != null) {
			if (value instanceof String) {
				String strVal = resolveEmbeddedValue((String) value);
				BeanDefinition bd = (beanName != null && containsBean(beanName) ? getMergedBeanDefinition(beanName) : null);
				value = evaluateBeanDefinitionString(strVal, bd);
			}
			TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
			return (descriptor.getField() != null ?
					converter.convertIfNecessary(value, type, descriptor.getField()) :
					converter.convertIfNecessary(value, type, descriptor.getMethodParameter()));
		}

		Object multipleBeans = resolveMultipleBeans(descriptor, beanName, autowiredBeanNames, typeConverter);
		if (multipleBeans != null) {
			return multipleBeans;
		}

		Map<String, Object> matchingBeans = findAutowireCandidates(beanName, type, descriptor);
		if (matchingBeans.isEmpty()) {
			if (isRequired(descriptor)) {
				raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
			}
			return null;
		}

		String autowiredBeanName;
		Object instanceCandidate;

		if (matchingBeans.size() > 1) {
			autowiredBeanName = determineAutowireCandidate(matchingBeans, descriptor);
			if (autowiredBeanName == null) {
				if (isRequired(descriptor) || !indicatesMultipleBeans(type)) {
					return descriptor.resolveNotUnique(type, matchingBeans);
				}
				else {
					// In case of an optional Collection/Map, silently ignore a non-unique case:
					// possibly it was meant to be an empty collection of multiple regular beans
					// (before 4.3 in particular when we didn't even look for collection beans).
					return null;
				}
			}
			instanceCandidate = matchingBeans.get(autowiredBeanName);
		}
		else {
			// We have exactly one match.
			Map.Entry<String, Object> entry = matchingBeans.entrySet().iterator().next();
			autowiredBeanName = entry.getKey();
			instanceCandidate = entry.getValue();
		}

		if (autowiredBeanNames != null) {
			autowiredBeanNames.add(autowiredBeanName);
		}
		return (instanceCandidate instanceof Class ?
				descriptor.resolveCandidate(autowiredBeanName, type, this) : instanceCandidate);
	}
	finally {
		ConstructorResolver.setCurrentInjectionPoint(previousInjectionPoint);
	}
}

Example 17

Source File: DefaultListableBeanFactory.java From java-technology-stack with MIT License

4 votes

@Nullable
public Object doResolveDependency(DependencyDescriptor descriptor, @Nullable String beanName,
		@Nullable Set<String> autowiredBeanNames, @Nullable TypeConverter typeConverter) throws BeansException {

	InjectionPoint previousInjectionPoint = ConstructorResolver.setCurrentInjectionPoint(descriptor);
	try {
		Object shortcut = descriptor.resolveShortcut(this);
		if (shortcut != null) {
			return shortcut;
		}

		Class<?> type = descriptor.getDependencyType();
		Object value = getAutowireCandidateResolver().getSuggestedValue(descriptor);
		if (value != null) {
			if (value instanceof String) {
				String strVal = resolveEmbeddedValue((String) value);
				BeanDefinition bd = (beanName != null && containsBean(beanName) ?
						getMergedBeanDefinition(beanName) : null);
				value = evaluateBeanDefinitionString(strVal, bd);
			}
			TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
			try {
				return converter.convertIfNecessary(value, type, descriptor.getTypeDescriptor());
			}
			catch (UnsupportedOperationException ex) {
				// A custom TypeConverter which does not support TypeDescriptor resolution...
				return (descriptor.getField() != null ?
						converter.convertIfNecessary(value, type, descriptor.getField()) :
						converter.convertIfNecessary(value, type, descriptor.getMethodParameter()));
			}
		}

		Object multipleBeans = resolveMultipleBeans(descriptor, beanName, autowiredBeanNames, typeConverter);
		if (multipleBeans != null) {
			return multipleBeans;
		}

		Map<String, Object> matchingBeans = findAutowireCandidates(beanName, type, descriptor);
		if (matchingBeans.isEmpty()) {
			if (isRequired(descriptor)) {
				raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
			}
			return null;
		}

		String autowiredBeanName;
		Object instanceCandidate;

		if (matchingBeans.size() > 1) {
			autowiredBeanName = determineAutowireCandidate(matchingBeans, descriptor);
			if (autowiredBeanName == null) {
				if (isRequired(descriptor) || !indicatesMultipleBeans(type)) {
					return descriptor.resolveNotUnique(descriptor.getResolvableType(), matchingBeans);
				}
				else {
					// In case of an optional Collection/Map, silently ignore a non-unique case:
					// possibly it was meant to be an empty collection of multiple regular beans
					// (before 4.3 in particular when we didn't even look for collection beans).
					return null;
				}
			}
			instanceCandidate = matchingBeans.get(autowiredBeanName);
		}
		else {
			// We have exactly one match.
			Map.Entry<String, Object> entry = matchingBeans.entrySet().iterator().next();
			autowiredBeanName = entry.getKey();
			instanceCandidate = entry.getValue();
		}

		if (autowiredBeanNames != null) {
			autowiredBeanNames.add(autowiredBeanName);
		}
		if (instanceCandidate instanceof Class) {
			instanceCandidate = descriptor.resolveCandidate(autowiredBeanName, type, this);
		}
		Object result = instanceCandidate;
		if (result instanceof NullBean) {
			if (isRequired(descriptor)) {
				raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
			}
			result = null;
		}
		if (!ClassUtils.isAssignableValue(type, result)) {
			throw new BeanNotOfRequiredTypeException(autowiredBeanName, type, instanceCandidate.getClass());
		}
		return result;
	}
	finally {
		ConstructorResolver.setCurrentInjectionPoint(previousInjectionPoint);
	}
}

Example 18

Source File: DefaultListableBeanFactory.java From spring-analysis-note with MIT License

4 votes

@Nullable
public Object doResolveDependency(DependencyDescriptor descriptor, @Nullable String beanName,
		@Nullable Set<String> autowiredBeanNames, @Nullable TypeConverter typeConverter) throws BeansException {

	InjectionPoint previousInjectionPoint = ConstructorResolver.setCurrentInjectionPoint(descriptor);
	try {
		Object shortcut = descriptor.resolveShortcut(this);
		if (shortcut != null) {
			return shortcut;
		}

		Class<?> type = descriptor.getDependencyType();
		Object value = getAutowireCandidateResolver().getSuggestedValue(descriptor);
		if (value != null) {
			if (value instanceof String) {
				String strVal = resolveEmbeddedValue((String) value);
				BeanDefinition bd = (beanName != null && containsBean(beanName) ?
						getMergedBeanDefinition(beanName) : null);
				value = evaluateBeanDefinitionString(strVal, bd);
			}
			TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
			try {
				return converter.convertIfNecessary(value, type, descriptor.getTypeDescriptor());
			}
			catch (UnsupportedOperationException ex) {
				// A custom TypeConverter which does not support TypeDescriptor resolution...
				return (descriptor.getField() != null ?
						converter.convertIfNecessary(value, type, descriptor.getField()) :
						converter.convertIfNecessary(value, type, descriptor.getMethodParameter()));
			}
		}

		Object multipleBeans = resolveMultipleBeans(descriptor, beanName, autowiredBeanNames, typeConverter);
		if (multipleBeans != null) {
			return multipleBeans;
		}

		Map<String, Object> matchingBeans = findAutowireCandidates(beanName, type, descriptor);
		if (matchingBeans.isEmpty()) {
			if (isRequired(descriptor)) {
				raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
			}
			return null;
		}

		String autowiredBeanName;
		Object instanceCandidate;

		if (matchingBeans.size() > 1) {
			autowiredBeanName = determineAutowireCandidate(matchingBeans, descriptor);
			if (autowiredBeanName == null) {
				if (isRequired(descriptor) || !indicatesMultipleBeans(type)) {
					return descriptor.resolveNotUnique(descriptor.getResolvableType(), matchingBeans);
				}
				else {
					// In case of an optional Collection/Map, silently ignore a non-unique case:
					// possibly it was meant to be an empty collection of multiple regular beans
					// (before 4.3 in particular when we didn't even look for collection beans).
					return null;
				}
			}
			instanceCandidate = matchingBeans.get(autowiredBeanName);
		}
		else {
			// We have exactly one match.
			Map.Entry<String, Object> entry = matchingBeans.entrySet().iterator().next();
			autowiredBeanName = entry.getKey();
			instanceCandidate = entry.getValue();
		}

		if (autowiredBeanNames != null) {
			autowiredBeanNames.add(autowiredBeanName);
		}
		if (instanceCandidate instanceof Class) {
			instanceCandidate = descriptor.resolveCandidate(autowiredBeanName, type, this);
		}
		Object result = instanceCandidate;
		if (result instanceof NullBean) {
			if (isRequired(descriptor)) {
				raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
			}
			result = null;
		}
		if (!ClassUtils.isAssignableValue(type, result)) {
			throw new BeanNotOfRequiredTypeException(autowiredBeanName, type, instanceCandidate.getClass());
		}
		return result;
	}
	finally {
		ConstructorResolver.setCurrentInjectionPoint(previousInjectionPoint);
	}
}