public
abstract
class
Observable
extends Object| java.lang.Object | |
| ↳ | com.tencent.wcdb.Observable<T> |
Class Overview
Provides methods for registering or unregistering arbitrary observers in an ArrayList. This abstract class is intended to be subclassed and specialized to maintain a registry of observers of specific types and dispatch notifications to them.
Summary
| Public Constructors | |||||||||||
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| Observable() | |||||||||||
| Public Methods | |||||||||||
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| void |
registerObserver(T observer)
Adds an observer to the list.
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| void |
unregisterAll()
Remove all registered observers.
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| void |
unregisterObserver(T observer)
Removes a previously registered observer.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Public Constructors
public Observable ()
Public Methods
public void registerObserver (T observer)
Adds an observer to the list. The observer cannot be null and it must not already be registered.
Parameters
| observer | the observer to register |
|---|
Throws
| IllegalArgumentException | the observer is null |
|---|---|
| IllegalStateException | the observer is already registered |
public void unregisterAll ()
Remove all registered observers.
public void unregisterObserver (T observer)
Removes a previously registered observer. The observer must not be null and it must already have been registered.
Parameters
| observer | the observer to unregister |
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Throws
| IllegalArgumentException | the observer is null |
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| IllegalStateException | the observer is not yet registered |