Value

java.lang.Object
- java.util.Observable
- - com.gears42.iot.webthing.Value<T>

```
public class Value<T>
extends java.util.Observable
```
A property value.
This is used for communicating between the Thing representation and the actual physical thing implementation.
Notifies all observers when the underlying value changes through an external update (command to turn the light off) or if the underlying sensor reports a new value.

Constructor Summary

Constructors
Constructor	Description
`Value(T initialValue)`	Create a read only value that can only be updated by a Thing's reading.
`Value(T initialValue, java.util.function.Consumer<T> valueForwarder)`	Create a writable value that can be set to a new value.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`T`	`get()`	Returns the last known value from the underlying thing.
`void`	`notifyOfExternalUpdate(T value)`	Called if the underlying thing reported a new value.
`void`	`set(T value)`	Set a new Value for this thing.

Methods inherited from class java.util.Observable
addObserver, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers

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

- Constructor Detail
  - Value
```
public Value(T initialValue)
```
    Create a read only value that can only be updated by a Thing's reading.
    Example: A sensor is updating its reading, but the reading cannot be set externally.
    
    Parameters:
    
    initialValue - The initial value
  - Value
```
public Value(T initialValue,
             java.util.function.Consumer<T> valueForwarder)
```
    Create a writable value that can be set to a new value.
    Example: A light that can be switched off by setting this to false.
    
    Parameters:
    
    initialValue - The initial value
    
    valueForwarder - The method that updates the actual value on the thing
- Method Detail
  - set
```
public final void set(T value)
```
    Set a new Value for this thing.
    Example: Switch a light off: set(false)
    
    Parameters:
    
    value - Value to set
  - get
```
public final T get()
```
    Returns the last known value from the underlying thing.
    Example: Returns false, when a light is off.
    
    Returns:
    
    The value.
  - notifyOfExternalUpdate
```
public final void notifyOfExternalUpdate(T value)
```
    Called if the underlying thing reported a new value. This informs observers about the update.
    Example: A sensor reports a new value.
    
    Parameters:
    
    value - the newly reported value