Package com.bobocode.bring.core.context.impl

Class ConstructorBeanInjection

java.lang.Object

com.bobocode.bring.core.context.impl.ConstructorBeanInjection

public class ConstructorBeanInjection
extends Object

Responsible for facilitating constructor-based dependency injection, the ConstructorBeanInjection class assists in creating beans by instantiating classes through constructors annotated with @Autowired or utilizing a single constructor without explicit @Autowired.

Since:

1.0

Author:

Blyzhnytsia Team

Field Summary

Fields

Modifier and Type	Field	Description
private final AnnotationBringBeanRegistry	beanRegistry
private final ClassPathScannerFactory	classPathScannerFactory

Constructor Summary

Constructors

Constructor	Description
ConstructorBeanInjection()

Method Summary

Modifier and Type	Method	Description
Object	create(Class<?> clazz, String beanName, BeanDefinition beanDefinition)	Creates a bean using constructor-based dependency injection for the provided class and bean definition.
private Object	createBeanUsingConstructor(Constructor<?> constructor, String beanName, BeanDefinition beanDefinition)	Creates a bean using the specified constructor and resolves its dependencies.
private Constructor<?>	findAutowiredConstructor(Class<?> clazz)	Finds a constructor annotated with @Autowired within the provided class.
private String	findBeanNameForArgumentInConstructor(Parameter parameter, String constructorParamName)	Finds the appropriate bean name for an argument in a constructor based on its parameter type.
private String	findPrimaryBeanNameOrByQualifierOrByParameter(List<String> beanNames, String paramName, Parameter parameter)	Resolves the primary bean name or selects a bean by qualifier or parameter name.

Methods inherited from class java.lang.Object

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

Field Details

beanRegistry

private final AnnotationBringBeanRegistry beanRegistry

classPathScannerFactory

private final ClassPathScannerFactory classPathScannerFactory

Constructor Details

ConstructorBeanInjection

public ConstructorBeanInjection()

Method Details

create

public Object create(Class<?> clazz,
 String beanName,
 BeanDefinition beanDefinition)

Creates a bean using constructor-based dependency injection for the provided class and bean definition.

Parameters:

clazz - The class for which the bean is to be created.

beanName - The name of the bean.

beanDefinition - The definition of the bean.

Returns:

The created bean object.

Throws:

NoConstructorWithAutowiredAnnotationBeanException - If no constructor is annotated with @Autowired.

NoSuchBeanException - If a required dependency bean is not found.

findAutowiredConstructor

private Constructor<?> findAutowiredConstructor(Class<?> clazz)

Finds a constructor annotated with @Autowired within the provided class. If multiple constructors exist, the one with the @Autowired annotation is selected or one without.

Parameters:

clazz - The class to search for an @Autowired annotated constructor.

Returns:

The @Autowired annotated constructor.

Throws:

NoConstructorWithAutowiredAnnotationBeanException - If no constructor is annotated with @Autowired.

createBeanUsingConstructor

private Object createBeanUsingConstructor(Constructor<?> constructor,
 String beanName,
 BeanDefinition beanDefinition)

Creates a bean using the specified constructor and resolves its dependencies. Instantiates the bean within the context based on resolved dependencies and the constructor.

Parameters:

constructor - The constructor to use for bean instantiation.

beanName - The name of the bean to be created.

beanDefinition - The definition of the bean being created.

Returns:

The created bean object using constructor.

Throws:

NoSuchBeanException - If a required dependency bean is not found.

findBeanNameForArgumentInConstructor

private String findBeanNameForArgumentInConstructor(Parameter parameter,
 String constructorParamName)

Finds the appropriate bean name for an argument in a constructor based on its parameter type. Handles scenarios with multiple candidate beans, qualifiers, and primary beans.

Parameters:

parameter - The parameter for which the bean name is to be resolved.

constructorParamName - The name of parameter for which the bean name is to be resolved.

Returns:

The resolved bean name for the parameter.

Throws:

NoSuchBeanException - If a required bean is not found.

NoUniqueBeanException - If multiple primary beans or qualifiers match the parameter type.

findPrimaryBeanNameOrByQualifierOrByParameter

private String findPrimaryBeanNameOrByQualifierOrByParameter(List<String> beanNames,
 String paramName,
 Parameter parameter)

Resolves the primary bean name or selects a bean by qualifier or parameter name.

Parameters:

beanNames - The candidate bean names for the parameter type.

paramName - The parameter name in the constructor.

parameter - The parameter for which the bean name is to be resolved.

Returns:

The resolved bean name based on primary, qualifier, or parameter name.

Throws:

NoSuchBeanException - If a required bean is not found.

NoUniqueBeanException - If multiple primary beans or qualifiers match the parameter type.