MvpNullObjectBasePresenter

java.lang.Object
- com.cheetahdigital.uikit.architecture.mvp.MvpNullObjectBasePresenter<V>

Type Parameters:

V - The type of the MvpView

All Implemented Interfaces:

MvpPresenter<V>

Direct Known Subclasses:

AlertChallengePresenter, ChangePasswordPresenter, CodeScannerPresenter, LoginPresenter, Presenter, SubmitReceiptPresenter
```
public class MvpNullObjectBasePresenter<V extends MvpView>
extends java.lang.Object
implements MvpPresenter<V>
```
A MvpPresenter implmenetation that implements the null object pattern for the attached mvp view. So whenever the view gets detached from this presenter by callingdetachView(boolean), a new "null object" view gets dynamically instantiated by using reflections and set as the current view (instead of null). The new "null object" view simply does nothing. This avoids null pointer exceptions and checks like if (getView() != null)

Since:

1.2.0

See Also:

MvpBasePresenter

Constructor Summary

Constructors
Constructor Description

MvpNullObjectBasePresenter()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`attachView(V view)`	Set or attach the view to this presenter
`void`	`detachView(boolean retainInstance)`	Will be called if the view has been destroyed.
`protected V`	`getView()`	Fetches the attached view.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MvpNullObjectBasePresenter
```
public MvpNullObjectBasePresenter()
```
- Method Detail
  - attachView
```
public void attachView(V view)
```
    Description copied from interface: MvpPresenter
    
    Set or attach the view to this presenter
    
    Specified by:
    
    attachView in interface MvpPresenter<V extends MvpView>
    
    Parameters:
    
    view - where presenter is attached
  - getView
```
@NonNull
protected V getView()
```
    Fetches the attached view.
    
    Returns:
    
    The view.
  - detachView
```
public void detachView(boolean retainInstance)
```
    Description copied from interface: MvpPresenter
    
    Will be called if the view has been destroyed. Typically this method will be invoked from Activity.detachView() or Fragment.onDestroyView()
    
    Specified by:
    
    detachView in interface MvpPresenter<V extends MvpView>
    
    Parameters:
    
    retainInstance - flag used to retain instance