Package com.vaadin.flow.di

Class LookupInitializer.LookupImpl

java.lang.Object

com.vaadin.flow.di.LookupInitializer.LookupImpl

All Implemented Interfaces:

Lookup

Enclosing class:

LookupInitializer

protected static class LookupInitializer.LookupImpl
extends Object
implements Lookup

Default implementation of Lookup.

Since:

Author:

Vaadin Ltd

Field Summary

Fields

Modifier and Type	Field	Description
protected Map<Class<?>,Collection<Object>>	serviceMap

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	LookupImpl(Map<Class<?>,Collection<Class<?>>> initialServices, BiFunction<Class<?>,Class<?>,Object> factory)	Creates a new instance of Lookup with services found in the application classpath.

Method Summary

Modifier and Type	Method	Description
<T> T	lookup(Class<T> serviceClass)	Lookup for a service of the given type.
<T> Collection<T>	lookupAll(Class<T> serviceClass)	Lookup for all services by the provided serviceClass.

Methods inherited from class java.lang.Object

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

Field Detail

serviceMap

protected final Map<Class<?>,Collection<Object>> serviceMap

Constructor Detail

LookupImpl

protected LookupImpl(Map<Class<?>,Collection<Class<?>>> initialServices,
                     BiFunction<Class<?>,Class<?>,Object> factory)

Creates a new instance of Lookup with services found in the application classpath.

Parameters:

initialServices - map of initial services with their implementations

factory - a factory to create a service object instance

Method Detail

lookup

public <T> T lookup(Class<T> serviceClass)

Description copied from interface: Lookup

Lookup for a service of the given type.

The serviceClass is usually an interface (though it doesn't have to be) and the returned value is some implementation of this interface.

Specified by:

lookup in interface Lookup

Type Parameters:

T - a service type

Parameters:

serviceClass - a service SPI class

Returns:

a service which implements the serviceClass, may be null if no services are registered for this SPI

See Also:

Lookup.lookupAll(Class)

lookupAll

public <T> Collection<T> lookupAll(Class<T> serviceClass)

Description copied from interface: Lookup

Lookup for all services by the provided serviceClass.

The serviceClass is usually an interface class (though it doesn't have to be) and the returned value is all implementations of this interface.

Specified by:

lookupAll in interface Lookup

Type Parameters:

T - a service type

Parameters:

serviceClass - a service SPI class

Returns:

all services which implement the serviceClass, if no services found an empty list is returned (so null is not returned)