Class DIContainer

java.lang.Object

com.itextpdf.commons.utils.DIContainer

public class DIContainer
extends Object

A simple dependency injection container.

The container is thread-safe.

Field Summary

Fields

Modifier and Type	Field	Description
private static final ConcurrentHashMap<Class<?>, Supplier<Object>>	instances
private final ConcurrentHashMap<Class<?>,Object>	localInstances

Constructor Summary

Constructors

Constructor	Description
DIContainer()	Creates a new instance of DIContainer.

Method Summary

Modifier and Type	Method	Description
<T> T	getInstance(Class<T> clazz)	Gets an instance of a class.
boolean	isRegistered(Class<?> clazz)	Checks if an instance is registered for a class.
void	register(Class<?> clazz, Object inst)	Registers an instance for a class.
static void	registerDefault(Class<?> clazz, Supplier<Object> supplier)	Registers a default instance for a class.

Methods inherited from class Object

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

Field Details

instances

private static final ConcurrentHashMap<Class<?>, Supplier<Object>> instances

localInstances

private final ConcurrentHashMap<Class<?>,Object> localInstances

Constructor Details

DIContainer

public DIContainer()

Creates a new instance of DIContainer.

Method Details

registerDefault

public static void registerDefault(Class<?> clazz,
 Supplier<Object> supplier)

Registers a default instance for a class.

Parameters:

clazz - the class

supplier - supplier of the instance

register

public void register(Class<?> clazz,
 Object inst)

Registers an instance for a class.

Parameters:

clazz - the class

inst - the instance

getInstance

public <T> T getInstance(Class<T> clazz)

Gets an instance of a class.

Type Parameters:

T - the type of the class

Parameters:

clazz - the class

Returns:

the instance

isRegistered

public boolean isRegistered(Class<?> clazz)

Checks if an instance is registered for a class. If the class is registered but the value is null, it will still return true.

Parameters:

clazz - the class

Returns:

true if an instance is registered, false otherwise