/*

 * 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 TreeMaker.QualIdent(Symbol) field access cascade ends with

 *          the top-level package (when no toplevel is set in TreeMaker)

 * @run main MakeQualIdent

 */

import com.sun.source.tree.IdentifierTree;

import com.sun.source.tree.MemberSelectTree;

import com.sun.source.tree.Tree;

import com.sun.source.util.JavacTask;

import com.sun.source.util.TreeScanner;

import com.sun.tools.javac.api.JavacTaskImpl;

import com.sun.tools.javac.api.JavacTool;

import com.sun.tools.javac.code.Symtab;

import com.sun.tools.javac.tree.TreeMaker;

import com.sun.tools.javac.util.Context;

import java.util.ArrayList;

public class MakeQualIdent {

    public static void main(String... args) throws Exception {

        JavacTool tool = JavacTool.create();

        JavacTask task = tool.getTask(null, null, null, new ArrayList<String>(), null, null);

        Context ctx = ((JavacTaskImpl)task).getContext();

        TreeMaker treeMaker = TreeMaker.instance(ctx);

        Symtab syms = Symtab.instance(ctx);

        String stringTree = printTree(treeMaker.QualIdent(syms.stringType.tsym));

        if (!"java.lang.String".equals(stringTree)) {

            throw new IllegalStateException(stringTree);

        }

    }

    private static String printTree(Tree tree) {

        final StringBuilder result = new StringBuilder();

        new TreeScanner<Void, Void>() {

            @Override public Void visitIdentifier(IdentifierTree node, Void p) {

                result.append(node.getName());

                return super.visitIdentifier(node, p);

            }

            @Override public Void visitMemberSelect(MemberSelectTree node, Void p) {

                scan(node.getExpression(), null);

                result.append(".");

                result.append(node.getIdentifier());

                return null;

            }

        }.scan(tree, null);

        return result.toString();

    }

}