1 files changed, 48 insertions, 0 deletions
diff --git a/plugins/uml/properties/org.eclipse.papyrus.uml.properties.xtext/src/org/eclipse/papyrus/uml/properties/xtext/sheet/UndoRedoStack.java b/plugins/uml/properties/org.eclipse.papyrus.uml.properties.xtext/src/org/eclipse/papyrus/uml/properties/xtext/sheet/UndoRedoStack.java
new file mode 100644
index 00000000000..556bd7aa562
--- /dev/null
+++ b/plugins/uml/properties/org.eclipse.papyrus.uml.properties.xtext/src/org/eclipse/papyrus/uml/properties/xtext/sheet/UndoRedoStack.java
@@ -0,0 +1,48 @@
+package org.eclipse.papyrus.uml.properties.xtext.sheet;
+
+import java.util.Stack;
+
+/**
+ * Encapsulation of the Undo and Redo stack(s)
+ * @author Petr Bodnar
+ */
+public class UndoRedoStack<T> {
+
+    private Stack<T> undo;
+    private Stack<T> redo;
+
+    public UndoRedoStack() {
+        undo = new Stack<T>();
+        redo = new Stack<T>();
+    }
+
+    public void pushUndo(T delta) {
+        undo.add(delta);
+    }
+
+    public void pushRedo(T delta) {
+        redo.add(delta);
+    }
+
+    public T popUndo() {
+        T res = undo.pop();
+        return res;
+    }
+
+    public T popRedo() {
+        T res = redo.pop();
+        return res;
+    }
+
+    public void clearRedo() {
+        redo.clear();
+    }
+
+    public boolean hasUndo() {
+        return !undo.isEmpty();
+    }
+
+    public boolean hasRedo() {
+        return !redo.isEmpty();
+    }
+}