common getElement method added

converter-CellDesigner/src/test/java/lcsb/mapviewer/converter/model/celldesigner/annotation/RestAnnotationParserTest.java

@@ -444,6 +444,12 @@ public class RestAnnotationParserTest extends CellDesignerTestFunctions {
 					// TODO Auto-generated method stub
 					
 				}
+
+        @Override
+        public String getElementId() {
+          // TODO Auto-generated method stub
+          return null;
+        }
 			});
 			fail("Exception expected");
 		} catch (NotImplementedException e) {

model/src/main/java/lcsb/mapviewer/model/map/BioEntity.java

@@ -160,5 +160,7 @@ public interface BioEntity extends Serializable {
 	 * 
 	 * @return semantic zoom level visibility
 	 */
-	String getVisibilityLevel();
+    String getVisibilityLevel();
+    
+    String getElementId();
 }

model/src/main/java/lcsb/mapviewer/model/map/reaction/Reaction.java

@@ -879,4 +879,9 @@ public class Reaction implements BioEntity {
 
   }
 
+  @Override
+  public String getElementId() {
+    return getIdReaction();
+  }
+
 }