ChangeDetector (documentation 1.7.1 API)

Type Parameters:

T - the type of the stateful object
```
@API(status=EXPERIMENTAL,
     since="1.7.0")
public interface ChangeDetector<T>
```
A change detector is used to determine if a stateful object has changed after the application of a transformer. This can become improve shrinking of chins and actionChains.

See Also:

Transformer, ChainArbitrary.improveShrinkingWith(Supplier), ActionChainArbitrary.improveShrinkingWith(Supplier)

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`static <T> ChangeDetector<T>`	`alwaysTrue()`
`void`	`before(T before)`	Get and remember the state before it is handed to a transformer.
`static <T> ChangeDetector<T>`	`forImmutables()`	A change detector that can be used for immutable types that implement an equals() method
`boolean`	`hasChanged(T after)`	Determine if the state object has changed.

- Method Detail
  - forImmutables
```
static <T> ChangeDetector<T> forImmutables()
```
    A change detector that can be used for immutable types that implement an equals() method
    
    Type Parameters:
    
    T - the type of the stateful object
    
    Returns:
    
    new instance of change detector
  - alwaysTrue
```
@API(status=INTERNAL)
static <T> ChangeDetector<T> alwaysTrue()
```
  - before
```
void before(T before)
```
    Get and remember the state before it is handed to a transformer.
  - hasChanged
```
boolean hasChanged(T after)
```
    Determine if the state object has changed.
    
    Parameters:
    
    after - The state resulting from handing it to a transformer.