feat: prepare DiffNode for storing endif lines

Author: eugen-shulimov

src/main/java/org/variantsync/diffdetective/variation/diff/DiffNode.java

@@ -51,6 +51,8 @@ public class DiffNode<L extends Label> implements HasNodeType {
 
     private Node featureMapping;
 
+    private String endIf = null;
+
     /**
      * The parents {@link DiffNode} before and after the edit.
      * This array has to be indexed by {@code Time.ordinal()}
@@ -146,6 +148,22 @@ public void setLabel(L newLabel) {
         label.setInnerLabel(newLabel);
     }
 
+    /**
+     * Returns the line with the endif of the corresponding if, if the node is an if node, otherwise null
+     * @return String, the Line with endif
+     */
+    public String getEndIf() {
+        return endIf;
+    }
+
+    /**
+     * Sets the line with the endif of the corresponding if, if the node is an if node
+     * @param endIf String, the Line with endif
+     */
+    public void setEndIf(String endIf) {
+        this.endIf = endIf;
+    }
+
     /**
      * Gets the first {@code if} node in the path from the root to this node at the time
      * {@code time}.