Package org.springframework.boot.util

Class Instantiator<T>

java.lang.Object

org.springframework.boot.util.Instantiator<T>

Type Parameters:

T - the type to instantiate

public class Instantiator<T>
extends Object

Simple factory used to instantiate objects by injecting available parameters.

Since:

2.4.0

Author:

Phillip Webb, Scott Frederick

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	Instantiator.AvailableParameters	Callback used to register available parameters.
static interface	Instantiator.FailureHandler	Strategy for handling a failure that occurs when instantiating a type.

Constructor Summary

Constructors

Constructor	Description
Instantiator(Class<?> type, Consumer<Instantiator.AvailableParameters> availableParameters)	Create a new Instantiator instance for the given type.
Instantiator(Class<?> type, Consumer<Instantiator.AvailableParameters> availableParameters, Instantiator.FailureHandler failureHandler)	Create a new Instantiator instance for the given type.

Method Summary

Modifier and Type	Method	Description
<A> A	getArg(Class<A> type)	Get an injectable argument instance for the given type.
T	instantiate(ClassLoader classLoader, String name)	Instantiate the given set of class name, injecting constructor arguments as necessary.
List<T>	instantiate(ClassLoader classLoader, Collection<String> names)	Instantiate the given set of class name, injecting constructor arguments as necessary.
T	instantiate(String name)	Instantiate the given set of class name, injecting constructor arguments as necessary.
List<T>	instantiate(Collection<String> names)	Instantiate the given set of class name, injecting constructor arguments as necessary.
T	instantiateType(Class<?> type)	Instantiate the given class, injecting constructor arguments as necessary.
List<T>	instantiateTypes(Collection<Class<?>> types)	Instantiate the given set of classes, injecting constructor arguments as necessary.

Methods inherited from class java.lang.Object

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

Constructor Details

Instantiator

public Instantiator(Class<?> type,
 Consumer<Instantiator.AvailableParameters> availableParameters)

Create a new Instantiator instance for the given type.

Parameters:

type - the type to instantiate

availableParameters - consumer used to register available parameters

Instantiator

public Instantiator(Class<?> type,
 Consumer<Instantiator.AvailableParameters> availableParameters,
 Instantiator.FailureHandler failureHandler)

Create a new Instantiator instance for the given type.

Parameters:

type - the type to instantiate

availableParameters - consumer used to register available parameters

failureHandler - a Instantiator.FailureHandler that will be called in case of failure when instantiating objects

Since:

2.7.0

Method Details

instantiate

public List<T> instantiate(Collection<String> names)

Instantiate the given set of class name, injecting constructor arguments as necessary.

Parameters:

names - the class names to instantiate

Returns:

a list of instantiated instances

instantiate

public List<T> instantiate(ClassLoader classLoader,
 Collection<String> names)

Instantiate the given set of class name, injecting constructor arguments as necessary.

Parameters:

classLoader - the source classloader

names - the class names to instantiate

Returns:

a list of instantiated instances

Since:

2.4.8

instantiate

public T instantiate(String name)

Instantiate the given set of class name, injecting constructor arguments as necessary.

Parameters:

name - the class name to instantiate

Returns:

an instantiated instance

Since:

3.4.0

instantiate

public T instantiate(ClassLoader classLoader,
 String name)

Instantiate the given set of class name, injecting constructor arguments as necessary.

Parameters:

classLoader - the source classloader

name - the class name to instantiate

Returns:

an instantiated instance

Since:

3.4.0

instantiateType

public T instantiateType(Class<?> type)

Instantiate the given class, injecting constructor arguments as necessary.

Parameters:

type - the type to instantiate

Returns:

an instantiated instance

Since:

3.4.0

instantiateTypes

public List<T> instantiateTypes(Collection<Class<?>> types)

Instantiate the given set of classes, injecting constructor arguments as necessary.

Parameters:

types - the types to instantiate

Returns:

a list of instantiated instances

Since:

2.4.8

getArg

public <A> A getArg(Class<A> type)

Get an injectable argument instance for the given type. This method can be used when manually instantiating an object without reflection.

Type Parameters:

A - the argument type

Parameters:

type - the argument type

Returns:

the argument to inject or null

Since:

3.4.0