6505047: javax.lang.model.element.Element.getEnclosingElement() doesn't return null for type parameter

Reviewed-by: darcy

langtools/test/tools/javac/processing/model/element/TestTypeParameter.java

@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 6505047
+ * @summary javax.lang.model.element.Element.getEnclosingElement() doesn't return null for type parameter
+ * @library ../../../lib
+ * @build JavacTestingAbstractProcessor TestTypeParameter
+ * @compile -processor TestTypeParameter -proc:only TestTypeParameter.java
+ */
+
+import java.util.*;
+import javax.annotation.processing.*;
+import javax.lang.model.element.*;
+import javax.lang.model.util.*;
+import javax.tools.*;
+
+public class TestTypeParameter<T> extends JavacTestingAbstractProcessor {
+    int round = 0;
+
+    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+        if (++round == 1) {
+            int found = (new Scanner()).scan(roundEnv.getRootElements(), null);
+            if (found == expect) {
+                note("generic elements found and verified: " + found);
+            } else {
+                error("unexpected number of results: expected " + expect
+                        + ", found " + found);
+            }
+
+        }
+        return true;
+    }
+
+    class Scanner extends ElementScanner7<Integer,Void> {
+        @Override
+        public Integer visitExecutable(ExecutableElement e, Void p) {
+            super.visitExecutable(e, p);
+            found += check(e, e.getTypeParameters());
+            return found;
+        }
+
+        @Override
+        public Integer visitType(TypeElement e, Void p) {
+            super.visitType(e, p);
+            found += check(e, e.getTypeParameters());
+            return found;
+        }
+
+        int found;
+    }
+
+    /**
+     * Check if type parameters, if any, have expected owner.
+     * Return 1 if typarams not empty and all have expected owner, else return 0.
+     */
+    int check(Element e, List<? extends TypeParameterElement> typarams) {
+        note("checking " + e, e);
+        if (typarams.isEmpty()) {
+            note("no type parameters found", e);
+            return 0;
+        }
+        for (TypeParameterElement tpe: typarams) {
+            note("checking type parameter " + tpe, tpe);
+            if (tpe.getEnclosingElement() != e) {
+                error("unexpected owner; expected: " + e
+                        + ", found " + tpe.getEnclosingElement(),
+                        tpe);
+                return 0;
+            }
+            if (tpe.getEnclosingElement() != tpe.getGenericElement()) {
+                error("unexpected generic element; expected: " + tpe.getGenericElement()
+                        + ", found " + tpe.getEnclosingElement(),
+                        tpe);
+                return 0;
+            }
+        }
+        note("verified " + e, e);
+        return 1;
+    }
+
+    void note(String msg) {
+        messager.printMessage(Diagnostic.Kind.NOTE, msg);
+    }
+
+    void note(String msg, Element e) {
+        messager.printMessage(Diagnostic.Kind.NOTE, msg, e);
+    }
+
+    void error(String msg, Element e) {
+        messager.printMessage(Diagnostic.Kind.ERROR, msg, e);
+    }
+
+    void error(String msg) {
+        messager.printMessage(Diagnostic.Kind.ERROR, msg);
+    }
+
+    // additional generic elements to test
+    <X> X m(X x) { return x; }
+
+    interface Intf<X> { X m() ; }
+
+    class Class<X> {
+        <Y> Class() { }
+    }
+
+    final int expect = 5;  // top level class, plus preceding examples
+}