aoqi@0: /*
aoqi@0:  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /*
aoqi@0:  * @test
aoqi@0:  * @bug     8023835
aoqi@0:  * @summary Verify that implicit type of lambda parameter is correctly attributed
aoqi@0:  *          in Scope
aoqi@0:  * @run main ScopeTest
aoqi@0:  */
aoqi@0: 
aoqi@0: import com.sun.source.tree.CompilationUnitTree;
aoqi@0: import com.sun.source.tree.MemberSelectTree;
aoqi@0: import com.sun.source.tree.Scope;
aoqi@0: import com.sun.source.util.JavacTask;
aoqi@0: import com.sun.source.util.TreePath;
aoqi@0: import com.sun.source.util.TreePathScanner;
aoqi@0: import com.sun.source.util.Trees;
aoqi@0: import com.sun.tools.javac.api.JavacTaskImpl;
aoqi@0: import com.sun.tools.javac.api.JavacTool;
aoqi@0: import com.sun.tools.javac.model.JavacTypes;
aoqi@0: import java.io.IOException;
aoqi@0: import java.net.URI;
aoqi@0: import java.util.ArrayList;
aoqi@0: import java.util.Collections;
aoqi@0: import javax.lang.model.element.Element;
aoqi@0: import javax.lang.model.type.TypeMirror;
aoqi@0: import javax.lang.model.util.Types;
aoqi@0: import javax.tools.JavaFileObject;
aoqi@0: import javax.tools.JavaFileObject.Kind;
aoqi@0: import javax.tools.SimpleJavaFileObject;
aoqi@0: 
aoqi@0: public class ScopeTest {
aoqi@0: 
aoqi@0:     private static final String SOURCE_CODE =
aoqi@0:             "public class Test {\n" +
aoqi@0:             "    private static void test() {\n" +
aoqi@0:             "        InvokeOn f = null;\n" +
aoqi@0:             "        f.run(x -> { x.correct(); });\n" +
aoqi@0:             "    }\n" +
aoqi@0:             "    public static final class FooBar {\n" +
aoqi@0:             "        public void dontRun() { }\n" +
aoqi@0:             "    }\n" +
aoqi@0:             "}\n" +
aoqi@0:             "class InvokeOn {\n" +
aoqi@0:             "    public void run(I i) { }\n" +
aoqi@0:             "}\n" +
aoqi@0:             "class FooBar {\n" +
aoqi@0:             "    public void correct() { }\n" +
aoqi@0:             "}\n" +
aoqi@0:             "interface I {\n" +
aoqi@0:             "    public void run(FooBar f);\n" +
aoqi@0:             "}";
aoqi@0: 
aoqi@0:     public static void main(String... args) throws Exception {
aoqi@0:         verifyLambdaScopeCorrect("");
aoqi@0:         verifyLambdaScopeCorrect("package test;");
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static void verifyLambdaScopeCorrect(final String packageClause) throws Exception {
aoqi@0:         JavacTool tool = JavacTool.create();
aoqi@0:         JavaFileObject source = new SimpleJavaFileObject(URI.create("mem://Test.java"), Kind.SOURCE) {
aoqi@0:             @Override public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
aoqi@0:                 return packageClause + SOURCE_CODE;
aoqi@0:             }
aoqi@0:             @Override public boolean isNameCompatible(String simpleName, Kind kind) {
aoqi@0:                 return true;
aoqi@0:             }
aoqi@0:         };
aoqi@0:         Iterable<? extends JavaFileObject> fos = Collections.singletonList(source);
aoqi@0:         JavacTask task = tool.getTask(null, null, null, new ArrayList<String>(), null, fos);
aoqi@0:         final Types types = JavacTypes.instance(((JavacTaskImpl) task).getContext());
aoqi@0:         final Trees trees = Trees.instance(task);
aoqi@0:         CompilationUnitTree cu = task.parse().iterator().next();
aoqi@0: 
aoqi@0:         task.analyze();
aoqi@0: 
aoqi@0:         new TreePathScanner<Void, Void>() {
aoqi@0:             @Override public Void visitMemberSelect(MemberSelectTree node, Void p) {
aoqi@0:                 if (node.getIdentifier().contentEquals("correct")) {
aoqi@0:                     TypeMirror xType = trees.getTypeMirror(new TreePath(getCurrentPath(), node.getExpression()));
aoqi@0:                     Scope scope = trees.getScope(getCurrentPath());
aoqi@0:                     for (Element l : scope.getLocalElements()) {
aoqi@0:                         if (!l.getSimpleName().contentEquals("x")) continue;
aoqi@0:                         if (!types.isSameType(xType, l.asType())) {
aoqi@0:                             throw new IllegalStateException("Incorrect variable type in scope: " + l.asType() + "; should be: " + xType);
aoqi@0:                         }
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 return super.visitMemberSelect(node, p);
aoqi@0:             }
aoqi@0:         }.scan(cu, null);
aoqi@0:     }
aoqi@0: }