org.springframework.beans.factory.support

Class SimpleAutowireCandidateResolver

java.lang.Object

org.springframework.beans.factory.support.SimpleAutowireCandidateResolver

All Implemented Interfaces:

AutowireCandidateResolver

Direct Known Subclasses:

GenericTypeAwareAutowireCandidateResolver

public class SimpleAutowireCandidateResolver
extends Object
implements AutowireCandidateResolver

AutowireCandidateResolver implementation to use when no annotation support is available. This implementation checks the bean definition only.

Since:

2.5

Author:

Mark Fisher, Juergen Hoeller

Field Summary

Fields

Modifier and Type	Field and Description
static SimpleAutowireCandidateResolver	INSTANCE Shared instance of SimpleAutowireCandidateResolver.

Constructor Summary

Constructors

Constructor and Description
SimpleAutowireCandidateResolver()

Method Summary

Modifier and Type	Method and Description
AutowireCandidateResolver	cloneIfNecessary() This implementation returns this as-is.
Object	getLazyResolutionProxyIfNecessary(DependencyDescriptor descriptor, String beanName) Build a proxy for lazy resolution of the actual dependency target, if demanded by the injection point.
Object	getSuggestedValue(DependencyDescriptor descriptor) Determine whether a default value is suggested for the given dependency.
boolean	hasQualifier(DependencyDescriptor descriptor) Determine whether the given descriptor declares a qualifier beyond the type (typically - but not necessarily - a specific kind of annotation).
boolean	isAutowireCandidate(BeanDefinitionHolder bdHolder, DependencyDescriptor descriptor) Determine whether the given bean definition qualifies as an autowire candidate for the given dependency.
boolean	isRequired(DependencyDescriptor descriptor) Determine whether the given descriptor is effectively required.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INSTANCE

public static final SimpleAutowireCandidateResolver INSTANCE

Shared instance of SimpleAutowireCandidateResolver.

Since:

5.2.7

Constructor Detail

SimpleAutowireCandidateResolver

public SimpleAutowireCandidateResolver()

Method Detail

isAutowireCandidate

public boolean isAutowireCandidate(BeanDefinitionHolder bdHolder,
                                   DependencyDescriptor descriptor)

Description copied from interface: AutowireCandidateResolver

Determine whether the given bean definition qualifies as an autowire candidate for the given dependency.

The default implementation checks BeanDefinition.isAutowireCandidate().

Specified by:

isAutowireCandidate in interface AutowireCandidateResolver

Parameters:

bdHolder - the bean definition including bean name and aliases

descriptor - the descriptor for the target method parameter or field

Returns:

whether the bean definition qualifies as autowire candidate

See Also:

BeanDefinition.isAutowireCandidate()

isRequired

public boolean isRequired(DependencyDescriptor descriptor)

Description copied from interface: AutowireCandidateResolver

Determine whether the given descriptor is effectively required.

The default implementation checks DependencyDescriptor.isRequired().

Specified by:

isRequired in interface AutowireCandidateResolver

Parameters:

descriptor - the descriptor for the target method parameter or field

Returns:

whether the descriptor is marked as required or possibly indicating non-required status some other way (e.g. through a parameter annotation)

See Also:

DependencyDescriptor.isRequired()

hasQualifier

public boolean hasQualifier(DependencyDescriptor descriptor)

Description copied from interface: AutowireCandidateResolver

Determine whether the given descriptor declares a qualifier beyond the type (typically - but not necessarily - a specific kind of annotation).

The default implementation returns false.

Specified by:

hasQualifier in interface AutowireCandidateResolver

Parameters:

descriptor - the descriptor for the target method parameter or field

Returns:

whether the descriptor declares a qualifier, narrowing the candidate status beyond the type match

See Also:

QualifierAnnotationAutowireCandidateResolver.hasQualifier(org.springframework.beans.factory.config.DependencyDescriptor)

getSuggestedValue

@Nullable
public Object getSuggestedValue(DependencyDescriptor descriptor)

Description copied from interface: AutowireCandidateResolver

Determine whether a default value is suggested for the given dependency.

The default implementation simply returns null.

Specified by:

getSuggestedValue in interface AutowireCandidateResolver

Parameters:

descriptor - the descriptor for the target method parameter or field

Returns:

the value suggested (typically an expression String), or null if none found

getLazyResolutionProxyIfNecessary

@Nullable
public Object getLazyResolutionProxyIfNecessary(DependencyDescriptor descriptor,
                                                          @Nullable
                                                          String beanName)

Description copied from interface: AutowireCandidateResolver

Build a proxy for lazy resolution of the actual dependency target, if demanded by the injection point.

The default implementation simply returns null.

Specified by:

getLazyResolutionProxyIfNecessary in interface AutowireCandidateResolver

Parameters:

descriptor - the descriptor for the target method parameter or field

beanName - the name of the bean that contains the injection point

Returns:

the lazy resolution proxy for the actual dependency target, or null if straight resolution is to be performed

cloneIfNecessary

public AutowireCandidateResolver cloneIfNecessary()

This implementation returns this as-is.

Specified by:

cloneIfNecessary in interface AutowireCandidateResolver

See Also:

INSTANCE