NodeChangeCollector (MPS.Core (JetBrains MPS 2019.1.0))

java.lang.Object
- jetbrains.mps.smodel.event.NodeChangeCollector

All Implemented Interfaces:

SNodeChangeListener
```
public class NodeChangeCollector
extends Object
implements SNodeChangeListener
```
Implementation of model change listener that collects events as commanded. Multiple start/stop sequences are possible. Nested start/stop are not supported. Initial state is stopped.
Not thread-safe, it's caller's responsibility to ensure single-thread use or to synchronize access.

Constructor Summary

Constructors
Constructor Description

NodeChangeCollector()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`nodeAdded(SNodeAddEvent event)`
`void`	`nodeRemoved(SNodeRemoveEvent event)`
`void`	`propertyChanged(SPropertyChangeEvent event)`
`List<AbstractModelChangeEvent>`	`purge()`	Gives access to events collected so far and clears all collected events.
`void`	`referenceChanged(SReferenceChangeEvent event)`
`void`	`start()`	Unconditionally enable event collection
`void`	`stop()`	Unconditionally disable event collection.

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

- Constructor Detail
  - NodeChangeCollector
```
public NodeChangeCollector()
```
- Method Detail
  - start
```
public void start()
```
    Unconditionally enable event collection
  - stop
```
public void stop()
```
    Unconditionally disable event collection. Events collected so far are kept.
  - purge
```
@NotNull
public List<AbstractModelChangeEvent> purge()
```
    Gives access to events collected so far and clears all collected events. Doesn't change start/stop state.
    
    Returns:
    
    ordered collection of model change events, or empty list if none had happened.
  - propertyChanged
```
public void propertyChanged(@NotNull
                            SPropertyChangeEvent event)
```
    Specified by:
    
    propertyChanged in interface SNodeChangeListener
  - referenceChanged
```
public void referenceChanged(@NotNull
                             SReferenceChangeEvent event)
```
    Specified by:
    
    referenceChanged in interface SNodeChangeListener
  - nodeAdded
```
public void nodeAdded(@NotNull
                      SNodeAddEvent event)
```
    Specified by:
    
    nodeAdded in interface SNodeChangeListener
  - nodeRemoved
```
public void nodeRemoved(@NotNull
                        SNodeRemoveEvent event)
```
    Specified by:
    
    nodeRemoved in interface SNodeChangeListener