org.apache.tapestry5.ioc.internal
Class ObjectLocatorImpl

java.lang.Object
  org.apache.tapestry5.ioc.internal.ObjectLocatorImpl

All Implemented Interfaces:

ObjectLocator

Direct Known Subclasses:

ServiceResourcesImpl

public class ObjectLocatorImpl
extends Object
implements ObjectLocator

Base service locator class used when only the module is known (i.e., when instantiating a module class).

Constructor Summary

ObjectLocatorImpl(InternalRegistry registry, Module module)

Method Summary

<T> T	autobuild(Class<T> clazz) Autobuilds a class by finding the public constructor with the most parameters.
<T> T	getObject(Class<T> objectType, AnnotationProvider annotationProvider) Obtains an object indirectly, using the MasterObjectProvider service.
<T> T	getService(Class<T> serviceInterface) Locates a service given just a service interface.
<T> T	getService(String serviceId, Class<T> serviceInterface) Obtains a service via its unique service id.
<T> T	proxy(Class<T> interfaceClass, Class<? extends T> implementationClass) Creates a proxy.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectLocatorImpl

public ObjectLocatorImpl(InternalRegistry registry,
                         Module module)

Method Detail

getService

public <T> T getService(String serviceId,
                        Class<T> serviceInterface)

Description copied from interface: ObjectLocator

Obtains a service via its unique service id. Returns the service's proxy. The service proxy implements the same interface as the actual service, and is used to instantiate the actual service only as needed (this is transparent to the application).

Specified by:

getService in interface ObjectLocator

Parameters:

serviceId - unique Service id used to locate the service object (may contain symbols, which will be expanded), case is ignored

serviceInterface - the interface implemented by the service (or an interface extended by the service interface)

Returns:

the service instance

getService

public <T> T getService(Class<T> serviceInterface)

Description copied from interface: ObjectLocator

Locates a service given just a service interface. A single service must implement the service interface (which can be hard to guarantee). The search takes into account inheritance of the service interface (not the service implementation), which may result in a failure due to extra matches.

Specified by:

getService in interface ObjectLocator

Parameters:

serviceInterface - the interface the service implements

Returns:

the service's proxy

getObject

public <T> T getObject(Class<T> objectType,
                       AnnotationProvider annotationProvider)

Description copied from interface: ObjectLocator

Obtains an object indirectly, using the MasterObjectProvider service.

Specified by:

getObject in interface ObjectLocator

Parameters:

objectType - the type of object to be returned

annotationProvider - provides access to annotations on the field or parameter for which a value is to be obtained, which may be utilized in selecting an appropriate object, use null when annotations are not available (in which case, selection will be based only on the object type)

Returns:

the requested object

See Also:

ObjectProvider

autobuild

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

Description copied from interface: ObjectLocator

Autobuilds a class by finding the public constructor with the most parameters. Services and resources will be injected into the parameters of the constructor.

Specified by:

autobuild in interface ObjectLocator

Parameters:

clazz - the type of object to instantiate

Returns:

the instantiated instance

See Also:

MasterObjectProvider

proxy

public <T> T proxy(Class<T> interfaceClass,
                   Class<? extends T> implementationClass)

Description copied from interface: ObjectLocator

Creates a proxy. The proxy will defer invocation of ObjectLocator.autobuild(Class) until just-in-time (that is, first method invocation). In a limited number of cases, it is necessary to use such a proxy to prevent service construction cycles, particularly when contributing (directly or indirectly) to the MasterObjectProvider (which is itself at the heart of autobuilding).

Specified by:

proxy in interface ObjectLocator

Parameters:

interfaceClass - the interface implemented by the proxy

implementationClass - a concrete class that implements the interface

Returns:

a proxy