Added check for existing overrides in add-missing-override (#447)

If you have multiple findings of the same rule for the same location,
some codemods will duplicate their fixes.

This PR adds a patch to stop this for the `add-missing-override`
codemod.

Author: andrecsilva

core-codemods/src/main/java/io/codemodder/codemods/AddMissingOverrideCodemod.java

@@ -1,7 +1,6 @@
 package io.codemodder.codemods;
 
 import com.github.javaparser.ast.CompilationUnit;
-import com.github.javaparser.ast.Node;
 import com.github.javaparser.ast.body.MethodDeclaration;
 import com.github.javaparser.ast.expr.SimpleName;
 import io.codemodder.*;
@@ -11,7 +10,6 @@
 import io.codemodder.providers.sonar.RuleIssue;
 import io.codemodder.providers.sonar.SonarPluginJavaParserChanger;
 import io.codemodder.sonar.model.Issue;
-import java.util.Optional;
 import javax.inject.Inject;
 
 /** A codemod for automatically fixing missing @Override annotations. */
@@ -36,15 +34,13 @@ public ChangesResult onFindingFound(
       final SimpleName methodName,
       final Issue issue) {
 
-    Optional<Node> parentNodeRef = methodName.getParentNode();
-    if (parentNodeRef.isPresent()) {
-      Node parentNode = parentNodeRef.get();
-      if (parentNode instanceof MethodDeclaration method) {
-        method.addAnnotation(Override.class);
-        return ChangesResult.changesApplied;
-      }
-    }
-    return ChangesResult.noChanges;
+    var maybeMethodName =
+        methodName
+            .getParentNode()
+            .map(p -> p instanceof MethodDeclaration ? (MethodDeclaration) p : null)
+            .filter(mr -> !mr.getAnnotationByName("Override").isPresent());
+    maybeMethodName.ifPresent(mr -> mr.addAnnotation(Override.class));
+    return maybeMethodName.map(mr -> ChangesResult.changesApplied).orElse(ChangesResult.noChanges);
   }
 
   @Override

core-codemods/src/test/resources/add-missing-override-s1161/Test.java.after

@@ -144,6 +144,11 @@ public class SqlInjectionLesson10b extends AssignmentEndpoint {
     public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
       return contents;
     }
+
+    @Override
+    public CharSequence getCharContent2(boolean ignoreEncodingErrors) throws IOException {
+      return contents;
+    }
   }
 
   private boolean check_text(String regex, String text) {

core-codemods/src/test/resources/add-missing-override-s1161/Test.java.before

@@ -143,6 +143,11 @@ public class SqlInjectionLesson10b extends AssignmentEndpoint {
     public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
       return contents;
     }
+
+    @Override
+    public CharSequence getCharContent2(boolean ignoreEncodingErrors) throws IOException {
+      return contents;
+    }
   }
 
   private boolean check_text(String regex, String text) {

core-codemods/src/test/resources/add-missing-override-s1161/sonar-issues_1.json

@@ -45,6 +45,42 @@
           "severity": "MEDIUM"
         }
       ]
+    },
+    {
+      "key": "AYvtrjy0LCzGLicz7Ajy",
+      "rule": "java:S1161",
+      "severity": "MAJOR",
+      "component": "nahsra_WebGoat_10_23:src/main/java/SqlInjectionLesson10b.java",
+      "project": "nahsra_WebGoat_10_23",
+      "line": 148,
+      "hash": "e4d44f915becc09c0ce386b304b7621b",
+      "textRange": {
+        "startLine": 148,
+        "endLine": 148,
+        "startOffset": 24,
+        "endOffset": 39
+      },
+      "flows": [],
+      "status": "OPEN",
+      "message": "Add the \"@Override\" annotation above this method signature",
+      "effort": "5min",
+      "debt": "5min",
+      "author": "nanne.baars@owasp.org",
+      "tags": [
+        "bad-practice"
+      ],
+      "creationDate": "2022-04-09T14:56:12+0200",
+      "updateDate": "2023-11-20T17:58:54+0100",
+      "type": "CODE_SMELL",
+      "organization": "nahsra",
+      "cleanCodeAttribute": "CLEAR",
+      "cleanCodeAttributeCategory": "INTENTIONAL",
+      "impacts": [
+        {
+          "softwareQuality": "MAINTAINABILITY",
+          "severity": "MEDIUM"
+        }
+      ]
     }
   ],
   "components": [