Add condition to check for super calls and this calls

This commit adds the method to check and avoid super and this calls,
since they can't be used to form edges.

Signed-off-by: Farhaan Bukhsh <[email protected]>

Author: Farhaan Bukhsh

persper/analytics/call_graph/java/java2.py

@@ -70,10 +70,12 @@ def enterMethodDeclaration(self, ctx=JavaParser.MethodDeclarationContext):
 
     def enterMethodCall(self, ctx: JavaParser.MethodCallContext):
         try:
-            name = ctx.IDENTIFIER().getText()
-            if self.current_function_name:
-                self.function_caller_callee_map[self.current_function_name].append(
-                    name)
+            # The condition is there to avoid functions like `this()` or `super()`
+            if ctx.IDENTIFIER():
+                name = ctx.IDENTIFIER().getText()
+                if self.current_function_name:
+                    self.function_caller_callee_map[self.current_function_name].append(
+                        name)
         except Exception as e:
             if DEBUG:
                 raise