/*

 * Copyright (c) 2014, 2016, 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.

 *

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 */

/**

 * @test

 * @bug 8038788

 * @summary Verify proper handling of annotations after method's type parameters.

 * @modules jdk.compiler

 * @build AfterMethodTypeParams

 * @run main AfterMethodTypeParams

 */

import java.io.IOException;

import java.io.StringWriter;

import java.net.URI;

import java.util.*;

import javax.lang.model.element.Name;

import javax.tools.*;

import com.sun.source.tree.*;

import com.sun.source.util.*;

public class AfterMethodTypeParams {

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

        new AfterMethodTypeParams().run();

    }

    void run() throws IOException {

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

        for (TestCase tc : testCases) {

            String test = TEMPLATE.replace("CONTENT", tc.snippet);

            List<JavaFileObject> files = Arrays.asList(new MyFileObject(test));

            StringWriter out = new StringWriter();

            JavacTask task = (JavacTask) compiler.getTask(out, null, null, options, null, files);

            new TreePathScanner<Void, Void>() {

                boolean seenAnnotation;

                @Override

                public Void visitAnnotation(AnnotationTree node, Void p) {

                    Name name = ((IdentifierTree) node.getAnnotationType()).getName();

                    seenAnnotation |= name.contentEquals("TA") || name.contentEquals("DA");

                    return null;

                }

                @Override

                public Void visitCompilationUnit(CompilationUnitTree node, Void p) {

                    super.visitCompilationUnit(node, p);

                    if (!seenAnnotation)

                        error(test, "Annotation was missing");

                    return null;

                }

            }.scan(task.parse(), null);

            task.analyze();

            if (!tc.error.equals(out.toString().trim())) {

                error(test, "Incorrect errors: " + out.toString());

            }

        }

        if (errors > 0) {

            throw new IllegalStateException("Errors found");

        }

    }

    int errors;

    void error(String code, String error) {

        System.out.println("Error detected: " + error);

        System.out.println("Code:");

        System.out.println(code);

        errors++;

    }

    static String TEMPLATE =

        "import java.lang.annotation.*;\n" +

        "public class Test {\n" +

        "    CONTENT\n" +

        "}\n" +

        "@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})\n" +

        "@interface DA { }\n" +

        "@Target(ElementType.TYPE_USE)\n" +

        "@interface TA { }\n";

    static class MyFileObject extends SimpleJavaFileObject {

        final String text;

        public MyFileObject(String text) {

            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

            this.text = text;

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return text;

        }

    }

    static TestCase[] testCases = new TestCase[] {

        new TestCase("<T> @DA int foo1() { return 0;}", ""),

        new TestCase("<T> @DA void foo2() { }", ""),

        new TestCase("<T> @TA int foo3() { return 0;}", ""),

        new TestCase("<T> @TA void foo4() { }",

                "Test.java:3:9: compiler.err.annotation.type.not.applicable"),

        new TestCase("<T> @DA Test() { }", "Test.java:3:9: compiler.err.illegal.start.of.type"),

        new TestCase("<T> @TA Test() { }", "Test.java:3:9: compiler.err.illegal.start.of.type"),

    };

    static class TestCase {

        final String snippet;

        final String error;

        public TestCase(String snippet, String error) {

            this.snippet = snippet;

            this.error = error;

        }

    }

}