Aggregate Change

The aggregate change combines multiple changes into one while
implementing the Change interface.

core/src/main/java/dev/kske/undoredo/core/AggregateChange.java

@@ -0,0 +1,47 @@
+package dev.kske.undoredo.core;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * @author Kai S. K. Engelbart
+ * @since 0.2.0
+ */
+public final class AggregateChange<C extends Change> implements Change {
+
+	private final List<C> changes = new ArrayList<>();
+
+	@SafeVarargs
+	public AggregateChange(C... changes) {
+		this(Arrays.asList(changes));
+	}
+
+	public AggregateChange(Collection<C> changes) {
+		changes.addAll(changes);
+	}
+
+	@Override
+	public void apply() {
+		changes.forEach(Change::apply);
+	}
+
+	@Override
+	public Change invert() {
+		List<Change> invertedChanges =
+			changes
+				.parallelStream()
+				.map(Change::invert)
+				.collect(Collectors.toList());
+		Collections.reverse(invertedChanges);
+		return new AggregateChange<>(invertedChanges);
+	}
+
+	@Override
+	public boolean isIdentity() {
+		return changes.stream().allMatch(Change::isIdentity);
+	}
+
+	public List<C> changes() {
+		return Collections.unmodifiableList(changes);
+	}
+}

core/src/main/java/dev/kske/undoredo/core/Change.java

@@ -1,7 +1,7 @@
 package dev.kske.undoredo.core;
 
 /**
- * Base interface for changes to be registered in an undo manager.
+ * Base interface for changes to be registered in a change manager.
  *
  * @author Maximilian Käfer
  * @since 0.0.1

javafx/src/main/java/dev/kske/undoredo/javafx/ChangeManagerWrapper.java

@@ -28,13 +28,13 @@ public class ChangeManagerWrapper<C extends Change, M extends ChangeManager<C>>
 	public static final String	UNDO_AVAILABLE		= "undoAvailable";
 	public static final String	REDO_AVAILABLE		= "redoAvailable";
 
-	protected ReadOnlyObjectWrapper<C>	lastChange		=
+	protected final ReadOnlyObjectWrapper<C>	lastChange		=
 		new ReadOnlyObjectWrapper<>(this, LAST_CHANGE);
-	protected ReadOnlyBooleanWrapper	atMarkedChange	=
+	protected final ReadOnlyBooleanWrapper	atMarkedChange	=
 		new ReadOnlyBooleanWrapper(this, AT_MARKED_CHANGE);
-	protected ReadOnlyBooleanWrapper	undoAvailable	=
+	protected final ReadOnlyBooleanWrapper	undoAvailable	=
 		new ReadOnlyBooleanWrapper(this, UNDO_AVAILABLE);
-	protected ReadOnlyBooleanWrapper	redoAvailable	=
+	protected final ReadOnlyBooleanWrapper	redoAvailable	=
 		new ReadOnlyBooleanWrapper(this, REDO_AVAILABLE);
 
 	protected final M manager;