net.sf.mmm.util.component.base

Class AbstractComponent

java.lang.Object

net.sf.mmm.util.component.base.AbstractComponent

Direct Known Subclasses:

AbstractLoggableComponent, AbstractNlsBundleFactory, AbstractNlsTemplateResolver, DefaultNlsResourceLocator, DefaultPojoPathFunctionManager, JustificationBuilderImpl, NlsFormatterMap, NlsMessageFormatterFactoryImpl, PojoDescriptorDependenciesImpl, XmlUtilImpl

public abstract class AbstractComponent
extends Object

This is the abstract base class for a component that needs initialization. We strongly recommend that component implementations should be stateless and therefore thread-safe. It provides an initialization state that helps to prevent accidental coding mistakes. E.g. you can do this:

 public class MyComponentImpl extends AbstractComponent {

  private OtherComponent otherComponent;

  public void setOtherComponent(OtherComponent otherComponent) {
    getInitializationState().requireNotInitilized();
    this.otherComponent = otherComponent;
  }

  public void doInitialize() {
    if (this.otherCompoent == null) {
      setOtherComponent(new OtherComponentDefault());
    }
  }

  public void doSomething() {
    getInitializationState().requireInitilized();
    // ... do something ...
  }

 }
 

In advance to this class, we recommend that you extend AbstractLoggableComponent.

Since:

1.0.1

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

See Also:

AbstractLoggableComponent

Field Summary

Fields

Modifier and Type	Field and Description
private InitializationState	initializationState

Constructor Summary

Constructors

Constructor and Description
AbstractComponent() The constructor.

Method Summary

Modifier and Type	Method and Description
protected void	doInitialize() This method performs the actual initialization.
protected void	doInitialized() This method is invoked at the end of the actual initialization.
protected InitializationState	getInitializationState() This method gets the InitializationState of this component.
void	initialize() This method initializes this class.

Methods inherited from class java.lang.Object

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

Field Detail

initializationState

private final InitializationState initializationState

See Also:

getInitializationState()

Constructor Detail

AbstractComponent

public AbstractComponent()

The constructor.

Method Detail

initialize

@PostConstruct
public final void initialize()

This method initializes this class. It has to be called after construction and injection is completed.

doInitialize

protected void doInitialize()

This method performs the actual initialization. It is called when initialize() is invoked for the first time.
ATTENTION:
When you override this method from a sub-class you need to do a super.doInitialize().

doInitialized

protected void doInitialized()

This method is invoked at the end of the actual initialization. It is called when initialize() is invoked for the first time after doInitialize() is completed and initialization-state has changed to initialized.
ATTENTION:
When you override this method from a sub-class you need to do a super.doInitialized().

getInitializationState

protected final InitializationState getInitializationState()

This method gets the InitializationState of this component.

Returns:

the initializationState

See Also:

initialize(), InitializationState.requireInitilized(), InitializationState.requireNotInitilized()