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/*
* Copyright (c) 2013, 2015, 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 8023835
* @summary Verify that implicit type of lambda parameter is correctly attributed
* in Scope
* @modules jdk.compiler/com.sun.tools.javac.api
* jdk.compiler/com.sun.tools.javac.model
* jdk.compiler/com.sun.tools.javac.util
* @run main ScopeTest
*/
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.MemberSelectTree;
import com.sun.source.tree.Scope;
import com.sun.source.util.JavacTask;
import com.sun.source.util.TreePath;
import com.sun.source.util.TreePathScanner;
import com.sun.source.util.Trees;
import com.sun.tools.javac.api.JavacTaskImpl;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.model.JavacTypes;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import javax.lang.model.element.Element;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Types;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileObject.Kind;
import javax.tools.SimpleJavaFileObject;
public class ScopeTest {
private static final String SOURCE_CODE =
"public class Test {\n" +
" private static void test() {\n" +
" InvokeOn f = null;\n" +
" f.run(x -> { x.correct(); });\n" +
" }\n" +
" public static final class FooBar {\n" +
" public void dontRun() { }\n" +
" }\n" +
"}\n" +
"class InvokeOn {\n" +
" public void run(I i) { }\n" +
"}\n" +
"class FooBar {\n" +
" public void correct() { }\n" +
"}\n" +
"interface I {\n" +
" public void run(FooBar f);\n" +
"}";
public static void main(String... args) throws Exception {
verifyLambdaScopeCorrect("");
verifyLambdaScopeCorrect("package test;");
}
private static void verifyLambdaScopeCorrect(final String packageClause) throws Exception {
JavacTool tool = JavacTool.create();
JavaFileObject source = new SimpleJavaFileObject(URI.create("mem://Test.java"), Kind.SOURCE) {
@Override public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
return packageClause + SOURCE_CODE;
}
@Override public boolean isNameCompatible(String simpleName, Kind kind) {
return !"module-info".equals(simpleName);
}
};
Iterable<? extends JavaFileObject> fos = Collections.singletonList(source);
JavacTask task = tool.getTask(null, null, null, new ArrayList<String>(), null, fos);
final Types types = JavacTypes.instance(((JavacTaskImpl) task).getContext());
final Trees trees = Trees.instance(task);
CompilationUnitTree cu = task.parse().iterator().next();
task.analyze();
new TreePathScanner<Void, Void>() {
@Override public Void visitMemberSelect(MemberSelectTree node, Void p) {
if (node.getIdentifier().contentEquals("correct")) {
TypeMirror xType = trees.getTypeMirror(new TreePath(getCurrentPath(), node.getExpression()));
Scope scope = trees.getScope(getCurrentPath());
for (Element l : scope.getLocalElements()) {
if (!l.getSimpleName().contentEquals("x")) continue;
if (!types.isSameType(xType, l.asType())) {
throw new IllegalStateException("Incorrect variable type in scope: " + l.asType() + "; should be: " + xType);
}
}
}
return super.visitMemberSelect(node, p);
}
}.scan(cu, null);
}
}
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