Package org.picocontainer.adapters

Class InstanceAdapter<T>

java.lang.Object

org.picocontainer.adapters.AbstractAdapter<T>

org.picocontainer.adapters.InstanceAdapter<T>

All Implemented Interfaces:

java.io.Serializable, ComponentAdapter<T>, ComponentLifecycle<T>, ComponentMonitorStrategy, LifecycleStrategy

public final class InstanceAdapter<T>
extends AbstractAdapter<T>
implements ComponentLifecycle<T>, LifecycleStrategy

Component adapter which wraps a component instance.

This component adapter supports both a Behavior and a LifecycleStrategy to control the lifecycle of the component. The lifecycle manager methods simply delegate to the lifecycle strategy methods on the component instance.

Author:

Aslak Hellesøy, Paul Hammant, Mauro Talevi

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.picocontainer.ComponentAdapter

ComponentAdapter.NOTHING

Constructor Summary

Constructors

Constructor	Description
InstanceAdapter(java.lang.Object componentKey, T componentInstance)
InstanceAdapter(java.lang.Object componentKey, T componentInstance, ComponentMonitor componentMonitor)
InstanceAdapter(java.lang.Object componentKey, T componentInstance, LifecycleStrategy lifecycleStrategy)
InstanceAdapter(java.lang.Object componentKey, T componentInstance, LifecycleStrategy lifecycleStrategy, ComponentMonitor componentMonitor)

Method Summary

Modifier and Type	Method	Description
boolean	componentHasLifecycle()	Test if a component honors a lifecycle.
void	dispose(java.lang.Object component)	Invoke the "dispose" method on the component instance if this is disposable.
void	dispose(PicoContainer container)	Invoke the "dispose" method on the component.
T	getComponentInstance(PicoContainer container, java.lang.reflect.Type into)	Retrieve the component instance.
java.lang.String	getDescriptor()	Get a string key descriptor of the component adapter for use in toString()
boolean	hasLifecycle(java.lang.Class<?> type)	Test if a component instance has a lifecycle.
boolean	isLazy(ComponentAdapter<?> adapter)	Is a component eager (not lazy) in that it should start when start() or equivalent is called, or lazy (it will only start on first getComponent() ).
boolean	isStarted()
void	start(java.lang.Object component)	Invoke the "start" method on the component instance if this is startable.
void	start(PicoContainer container)	Invoke the "start" method on the component.
void	stop(java.lang.Object component)	Invoke the "stop" method on the component instance if this is stoppable.
void	stop(PicoContainer container)	Invoke the "stop" method on the component.
java.lang.String	toString()
void	verify(PicoContainer container)	Verify that all dependencies for this adapter can be satisfied.

Methods inherited from class org.picocontainer.adapters.AbstractAdapter

accept, changeMonitor, checkTypeCompatibility, currentMonitor, findAdapterOfType, getComponentImplementation, getComponentInstance, getComponentKey, getDelegate

Methods inherited from class java.lang.Object

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

Constructor Detail

InstanceAdapter

public InstanceAdapter(java.lang.Object componentKey,
                       T componentInstance,
                       LifecycleStrategy lifecycleStrategy,
                       ComponentMonitor componentMonitor)
                throws PicoCompositionException

Throws:

PicoCompositionException

InstanceAdapter

public InstanceAdapter(java.lang.Object componentKey,
                       T componentInstance)

InstanceAdapter

public InstanceAdapter(java.lang.Object componentKey,
                       T componentInstance,
                       LifecycleStrategy lifecycleStrategy)

InstanceAdapter

public InstanceAdapter(java.lang.Object componentKey,
                       T componentInstance,
                       ComponentMonitor componentMonitor)

Method Detail

getComponentInstance

public T getComponentInstance(PicoContainer container,
                              java.lang.reflect.Type into)

Description copied from interface: ComponentAdapter

Retrieve the component instance. This method will usually create a new instance each time it is called, but that is not required. For example, Cached will always return the same instance.

Specified by:

getComponentInstance in interface ComponentAdapter<T>

Parameters:

container - the PicoContainer, that is used to resolve any possible dependencies of the instance.

into - the class that is about to be injected into. Use ComponentAdapter.NOTHING.class if this is not important to you.

Returns:

the component instance.

verify

public void verify(PicoContainer container)

Description copied from interface: ComponentAdapter

Verify that all dependencies for this adapter can be satisfied. Normally, the adapter should verify this by checking that the associated PicoContainer contains all the needed dependencies.

Specified by:

verify in interface ComponentAdapter<T>

Parameters:

container - the PicoContainer, that is used to resolve any possible dependencies of the instance.

getDescriptor

public java.lang.String getDescriptor()

Description copied from interface: ComponentAdapter

Get a string key descriptor of the component adapter for use in toString()

Specified by:

getDescriptor in interface ComponentAdapter<T>

Returns:

the descriptor

toString

public java.lang.String toString()

Overrides:

toString in class AbstractAdapter<T>

Returns:

Returns the ComponentAdapter's class name and the component's key.

See Also:

Object.toString()

start

public void start(PicoContainer container)

Description copied from interface: ComponentLifecycle

Invoke the "start" method on the component.

Specified by:

start in interface ComponentLifecycle<T>

Parameters:

container - the container to "start" the component

stop

public void stop(PicoContainer container)

Description copied from interface: ComponentLifecycle

Invoke the "stop" method on the component.

Specified by:

stop in interface ComponentLifecycle<T>

Parameters:

container - the container to "stop" the component

dispose

public void dispose(PicoContainer container)

Description copied from interface: ComponentLifecycle

Invoke the "dispose" method on the component.

Specified by:

dispose in interface ComponentLifecycle<T>

Parameters:

container - the container to "dispose" the component

componentHasLifecycle

public boolean componentHasLifecycle()

Description copied from interface: ComponentLifecycle

Test if a component honors a lifecycle.

Specified by:

componentHasLifecycle in interface ComponentLifecycle<T>

Returns:

true if the component has a lifecycle

isStarted

public boolean isStarted()

Specified by:

isStarted in interface ComponentLifecycle<T>

start

public void start(java.lang.Object component)

Description copied from interface: LifecycleStrategy

Invoke the "start" method on the component instance if this is startable. It is up to the implementation of the strategy what "start" and "startable" means.

Specified by:

start in interface LifecycleStrategy

Parameters:

component - the instance of the component to start

stop

public void stop(java.lang.Object component)

Description copied from interface: LifecycleStrategy

Invoke the "stop" method on the component instance if this is stoppable. It is up to the implementation of the strategy what "stop" and "stoppable" means.

Specified by:

stop in interface LifecycleStrategy

Parameters:

component - the instance of the component to stop

dispose

public void dispose(java.lang.Object component)

Description copied from interface: LifecycleStrategy

Invoke the "dispose" method on the component instance if this is disposable. It is up to the implementation of the strategy what "dispose" and "disposable" means.

Specified by:

dispose in interface LifecycleStrategy

Parameters:

component - the instance of the component to dispose

hasLifecycle

public boolean hasLifecycle(java.lang.Class<?> type)

Description copied from interface: LifecycleStrategy

Test if a component instance has a lifecycle.

Specified by:

hasLifecycle in interface LifecycleStrategy

Parameters:

type - the component's type

Returns:

true if the component has a lifecycle

isLazy

public boolean isLazy(ComponentAdapter<?> adapter)

Description copied from interface: LifecycleStrategy

Is a component eager (not lazy) in that it should start when start() or equivalent is called, or lazy (it will only start on first getComponent() ). The default is the first of those two.

Specified by:

isLazy in interface LifecycleStrategy

Returns:

true if lazy, false if not lazy