Issue checkstyle#3041: RequireThisCheck doesn't see outer classes for…

… anonymous classes

config/suppressions.xml

@@ -68,6 +68,8 @@
     <suppress checks="MethodCount" files="[\\/]CommentsIndentationCheck.java$"/>
     <!--VisibilityModifierCheck has 7 options which require 7 additional methods (setters)-->
     <suppress checks="MethodCount" files="[\\/]VisibilityModifierCheck.java$"/>
+    <!--RequireThisCheck has a hierarchy of nested classes which contains a lot of methods. -->
+    <suppress checks="MethodCount" files="[\\/]RequireThisCheck.java$"/>
 
     <!-- we need that set of converters -->
     <suppress checks="ClassDataAbstractionCoupling" files="AutomaticBean\.java"/>

src/main/java/com/puppycrawl/tools/checkstyle/checks/coding/RequireThisCheck.java

@@ -283,7 +283,7 @@ private void logViolation(String msgKey, DetailAST ast, AbstractFrame frame) {
         if (frame.getFrameName().equals(getNearestClassFrameName())) {
             log(ast, msgKey, ast.getText(), "");
         }
-        else {
+        else if (!(frame instanceof AnonymousClassFrame)) {
             log(ast, msgKey, ast.getText(), frame.getFrameName() + '.');
         }
     }
@@ -361,6 +361,12 @@ private static void collectDeclarations(Deque<AbstractFrame> frameStack, DetailA
                 final DetailAST ctorFrameNameIdent = ast.findFirstToken(TokenTypes.IDENT);
                 frameStack.addFirst(new ConstructorFrame(frame, ctorFrameNameIdent));
                 break;
+            case TokenTypes.LITERAL_NEW:
+                if (isAnonymousClassDef(ast)) {
+                    frameStack.addFirst(new AnonymousClassFrame(frame,
+                            ast.getFirstChild().toString()));
+                }
+                break;
             default:
                 // do nothing
         }
@@ -405,11 +411,26 @@ private void endCollectingDeclarations(Queue<AbstractFrame> frameStack, DetailAS
             case TokenTypes.CTOR_DEF :
                 frames.put(ast, frameStack.poll());
                 break;
+            case TokenTypes.LITERAL_NEW :
+                if (isAnonymousClassDef(ast)) {
+                    frames.put(ast, frameStack.poll());
+                }
+                break;
             default :
                 // do nothing
         }
     }
 
+    /**
+     * Whether the AST is a definition of an anonymous class.
+     * @param ast the AST to process.
+     * @return true if the AST is a definition of an anonymous class.
+     */
+    private static boolean isAnonymousClassDef(DetailAST ast) {
+        final DetailAST lastChild = ast.getLastChild();
+        return lastChild != null && lastChild.getType() == TokenTypes.OBJBLOCK;
+    }
+
     /**
      * Returns the class frame where violation is found (where the field is used without 'this')
      * or null otherwise.
@@ -1062,7 +1083,7 @@ protected FrameType getType() {
     }
 
     /**
-     * A frame initiated at class< enum or interface definition; holds instance variable names.
+     * A frame initiated at class, enum or interface definition; holds instance variable names.
      * @author Stephen Bloch
      * @author Andrei Selkin
      */
@@ -1248,6 +1269,30 @@ private static boolean isSimilarSignature(DetailAST ident, DetailAST ast) {
         }
     }
 
+    /**
+     * An anonymous class frame; holds instance variable names.
+     */
+    private static class AnonymousClassFrame extends ClassFrame {
+
+        /** The name of the frame. */
+        private final String frameName;
+
+        /**
+         * Creates anonymous class frame.
+         * @param parent parent frame.
+         * @param frameName name of the frame.
+         */
+        protected AnonymousClassFrame(AbstractFrame parent, String frameName) {
+            super(parent, null);
+            this.frameName = frameName;
+        }
+
+        @Override
+        protected String getFrameName() {
+            return frameName;
+        }
+    }
+
     /**
      * A frame initiated on entering a statement list; holds local variable names.
      * @author Stephen Bloch

src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/RequireThisCheckTest.java

@@ -137,7 +137,11 @@ public void testTokensNotNull() {
     public void testWithAnonymousClass() throws Exception {
         final DefaultConfiguration checkConfig = createCheckConfig(RequireThisCheck.class);
         checkConfig.addAttribute("validateOnlyOverlapping", "false");
-        final String[] expected = CommonUtils.EMPTY_STRING_ARRAY;
+        final String[] expected = {
+            "19:25: " + getCheckMessage(MSG_METHOD, "doSideEffect", ""),
+            "23:24: " + getCheckMessage(MSG_VARIABLE, "bar", "InputRequireThis3."),
+            "46:17: " + getCheckMessage(MSG_VARIABLE, "foobar", ""),
+        };
         verify(checkConfig,
                 getPath("InputRequireThis3.java"),
                 expected);

src/test/resources/com/puppycrawl/tools/checkstyle/checks/coding/InputRequireThis3.java

@@ -1,6 +1,9 @@
 package com.puppycrawl.tools.checkstyle.checks.coding;
 
 public class InputRequireThis3 {
+
+    private int bar;
+
     interface AnonWithEmpty {
         public void fooEmpty();
     }
@@ -17,7 +20,30 @@ public void fooEmpty() {
             }
 
             public int doSideEffect() {
-                return 1;
+                return bar;
+            }
+        };
+
+        new AnonWithEmpty() {
+            int anonMember = 0;
+
+            @Override
+            public void fooEmpty() {
+                new AnonWithEmpty() {
+
+                    @Override
+                    public void fooEmpty() {
+                        anonMember++;
+                    }
+                };
+            }
+        };
+
+        new AnonWithEmpty() {
+            int foobar = 0;
+            @Override
+            public void fooEmpty() {
+                foobar++;
             }
         };
     }