langtools/test/tools/javac/MethodParameters/CaptureTest.java

/*
 * Copyright (c) 2012, 2013, 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 8015701
 * @summary Test method parameter attribute generation with captured locals.
 * @compile -parameters CaptureTest.java
 * @run main CaptureTest
 */
import java.lang.Class;
import java.lang.reflect.Constructor;
import java.lang.reflect.Parameter;
import java.lang.reflect.Modifier;
import java.util.List;
import java.util.ArrayList;

public class CaptureTest {

    private static final int SYNTHETIC = 0x1000;
    private static final int MANDATED = 0x8000;

    public static void main(String... args) throws Exception {
        new CaptureTest().run();
    }


    private void run() throws Exception {
        final Encloser pn = new Encloser();

        /* Cases covered here:
         *
         * - Local class
         * - Inner class
         * - Anonymous class
         * - Anonymous class extending a local
         * - Anonymous class extending an inner
         */
        pn.makeLocal("hello").check();
        pn.makeInner("hello").check();
        pn.makeAnon("hello").check();
        pn.makeAnonExtendsLocal("hello").check();
        pn.makeAnonExtendsInner("hello").check();

        if (0 != errors)
            throw new Exception("MethodParameters test failed with " +
                                errors + " errors");
    }

    private void error(final String msg) {
        System.err.println("Error: " + msg);
        errors++;
    }

    int errors;

    abstract class Tester {

        public Tester(final int param) {}

        protected abstract String[] names();
        protected abstract int[] modifiers();
        protected abstract Class[] types();

        public void check() {
            final Class<?> cls = this.getClass();
            final Constructor<?> ctor = cls.getDeclaredConstructors()[0];
            final Parameter[] params = ctor.getParameters();
            final String[] names = names();
            final int[] modifiers = modifiers();
            final Class[] types = types();

            System.err.println("Testing class " + cls);

            if (params.length == names.length) {
                for (int i = 0; i < names.length; i++) {
                    System.err.println("Testing parameter " + params[i].getName());
                    if (!params[i].getName().equals(names[i]))
                        error("Expected parameter name " + names[i] +
                              " got " + params[i].getName());
                    if (params[i].getModifiers() != modifiers[i])
                        error("Expected parameter modifiers " +
                              modifiers[i] + " got " +
                              params[i].getModifiers());
                    if (!params[i].getType().equals(types[i]))
                        error("Expected parameter type " + types[i] +
                              " got " + params[i].getType());
                }
            } else
                error("Expected " + names.length + " parameters");

        }

    }

    class Encloser {
        private class InnerTester extends Tester {
            public InnerTester(final int innerparam) {
                super(innerparam);
            }

            protected String[] names() {
                return new String[] {
                    "this$1",
                    "innerparam"
                };
            }

            protected int[] modifiers() {
                return new int[] {
                    Modifier.FINAL | SYNTHETIC,
                    Modifier.FINAL
                };
            }

            protected Class[] types() {
                return new Class[] {
                    Encloser.class,
                    int.class
                };
            }
        }

        public Tester makeInner(final String message) {
            return new InnerTester(2);
        }

        public Tester makeLocal(final String message) {
            class LocalTester extends Tester {
                public LocalTester(final int localparam) {
                    super(localparam);
                }

                protected String[] names() {
                    return new String[] {
                        "this$1",
                        "localparam",
                        "val$message"
                    };
                }

                protected int[] modifiers() {
                    return new int[] {
                        Modifier.FINAL | MANDATED,
                        Modifier.FINAL,
                        Modifier.FINAL | SYNTHETIC
                    };
                }

                protected Class[] types() {
                    return new Class[] {
                        Encloser.class,
                        int.class,
                        String.class
                    };
                }

                public String message() {
                    return message;
                }
            }

            return new LocalTester(2);
        }

        public Tester makeAnonExtendsLocal(final String message) {
            abstract class LocalTester extends Tester {
                public LocalTester(final int localparam) {
                    super(localparam);
                }

                protected String[] names() {
                    return new String[] {
                        "this$1",
                        "localparam",
                        "val$message"
                    };
                }

                protected int[] modifiers() {
                    return new int[] {
                        Modifier.FINAL | MANDATED,
                        Modifier.FINAL,
                        Modifier.FINAL | SYNTHETIC
                    };
                }

                protected Class[] types() {
                    return new Class[] {
                        Encloser.class,
                        int.class,
                        String.class
                    };
                }

            }

            return new LocalTester(2) {
                public String message() {
                    return message;
                }
            };
        }

        public Tester makeAnonExtendsInner(final String message) {
            return new InnerTester(2) {
                protected String[] names() {
                    return new String[] {
                        "this$1",
                        "innerparam",
                        "val$message"
                    };
                }

                protected int[] modifiers() {
                    return new int[] {
                        Modifier.FINAL | MANDATED,
                        Modifier.FINAL,
                        Modifier.FINAL | SYNTHETIC
                    };
                }

                protected Class[] types() {
                    return new Class[] {
                        Encloser.class,
                        int.class,
                        String.class
                    };
                }

                public String message() {
                    return message;
                }
            };
        }

        public Tester makeAnon(final String message) {
            return new Tester(2) {
                protected String[] names() {
                    return new String[] {
                        "this$1",
                        "param",
                        "val$message"
                    };
                }

                protected int[] modifiers() {
                    return new int[] {
                        Modifier.FINAL | MANDATED,
                        Modifier.FINAL,
                        Modifier.FINAL | SYNTHETIC
                    };
                }

                protected Class[] types() {
                    return new Class[] {
                        Encloser.class,
                        int.class,
                        String.class
                    };
                }

                public String message() {
                    return message;
                }
            };
        }
    }
}