/*

 * Copyright (c) 2012, 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 7192245 8005851 8005166 8071453

 * @summary Automatic test for checking set of allowed modifiers on interface methods

 */

import com.sun.source.util.JavacTask;

import java.net.URI;

import java.util.Arrays;

import java.util.List;

import javax.tools.Diagnostic;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.ToolProvider;

public class TestDefaultMethodsSyntax {

    static int checkCount = 0;

    enum VersionKind {

        PRE_LAMBDA("7"),

        LAMBDA("8"),

        POST_LAMBDA("9");

        String versionString;

        VersionKind(String versionString) {

            this.versionString = versionString;

        }

        List<String> getOptions() {

            return Arrays.asList("-XDallowStaticInterfaceMethods", "-source", versionString);

        }

    }

    enum ModifierKind {

        NONE(""),

        PUBLIC("public"),

        PROTECTED("protected"),

        PRIVATE("private"),

        ABSTRACT("abstract"),

        STATIC("static"),

        NATIVE("native"),

        SYNCHRONIZED("synchronized"),

        FINAL("final"),

        STRICTFP("strictfp"),

        DEFAULT("default");

        String modStr;

        private ModifierKind(String modStr) {

            this.modStr = modStr;

        }

        static boolean intersect(ModifierKind mk, ModifierKind... mks) {

            for (ModifierKind mk2 : mks) {

                if (mk == mk2) return true;

            }

            return false;

        }

        static boolean compatible(MethodKind mk, ModifierKind mod1, ModifierKind mod2, EnclosingKind ek) {

            if (intersect(ABSTRACT, mod1, mod2) || intersect(NATIVE, mod1, mod2)) {

                return mk == MethodKind.NO_BODY;

            } else if (intersect(DEFAULT, mod1, mod2) || intersect(STATIC, mod1, mod2)

                    || intersect(PRIVATE, mod1, mod2)) {

                return mk == MethodKind.BODY;

            } else {

                return ek == EnclosingKind.INTERFACE ?

                        mk == MethodKind.NO_BODY : mk == MethodKind.BODY;

            }

        }

        boolean compatible(EnclosingKind ek) {

            switch (this) {

                case PROTECTED:

                    return ek != EnclosingKind.INTERFACE;

                default:

                    return true;

            }

        }

        static boolean compatible(ModifierKind m1, ModifierKind m2, EnclosingKind ek) {

            Result res1 = allowedModifierPairs[m1.ordinal()][m2.ordinal()];

            Result res2 = allowedModifierPairs[m2.ordinal()][m1.ordinal()];

            if (res1 != res2) {

                throw new AssertionError(String.format("Ill-formed table: [%s,%s] != [%s,%s]", m1, m2, m2, m1));

            } else {

                return res1.compatible(ek, m1, m2);

            }

        }

        interface Result {

            boolean compatible(EnclosingKind ek, ModifierKind m1, ModifierKind m2);

        }

        static final Result T = new Result() {

            @Override

            public boolean compatible(EnclosingKind ek, ModifierKind m1, ModifierKind m2) {

                return true;

            }

        };

        static final Result F = new Result() {

            @Override

            public boolean compatible(EnclosingKind ek, ModifierKind m1, ModifierKind m2) {

                return false;

            }

        };

        static final Result C = new Result() {

            @Override

            public boolean compatible(EnclosingKind ek, ModifierKind m1, ModifierKind m2) {

                return ek != EnclosingKind.INTERFACE;

            }

        };

        static final Result I = new Result() {

            @Override

            public boolean compatible(EnclosingKind ek, ModifierKind m1, ModifierKind m2) {

                return ek == EnclosingKind.INTERFACE;

            }

        };

        static Result[][] allowedModifierPairs = {

            /*                     NONE  PUBLIC  PROTECTED  PRIVATE  ABSTRACT  STATIC  NATIVE  SYNCHRONIZED  FINAL  STRICTFP  DEFAULT */

            /* NONE */           { T   , T    , C        , T       , T       , T     , C     , C           , C    , C       , I   },

            /* PUBLIC */         { T   , F    , F        , F       , T       , T     , C     , C           , C    , C       , I   },

            /* PROTECTED */      { C   , F    , F        , F       , C       , C     , C     , C           , C    , C       , F   },

            /* PRIVATE */        { T   , F    , F        , F       , F       , T     , C     , C           , C    , T       , F   },

            /* ABSTRACT */       { T   , T    , C        , F       , F       , F     , F     , F           , F    , F       , F   },

            /* STATIC */         { T   , T    , C        , T       , F       , F     , C     , C           , C    , T       , F   },

            /* NATIVE */         { C   , C    , C        , C       , F       , C     , F     , C           , C    , F       , F   },

            /* SYNCHRONIZED */   { C   , C    , C        , C       , F       , C     , C     , F           , C    , C       , F   },

            /* FINAL */          { C   , C    , C        , C       , F       , C     , C     , C           , F    , C       , F   },

            /* STRICTFP */       { C   , C    , C        , T       , F       , T     , F     , C           , C    , F       , I   },

            /* DEFAULT */        { I   , I    , F        , F       , F       , F     , F     , F           , F    , I       , F   }};

    }

    enum MethodKind {

        NO_BODY("void m();"),

        BODY("void m() { }");

        String methStr;

        private MethodKind(String methStr) {

            this.methStr = methStr;

        }

    }

    enum EnclosingKind {

        ABSTRACT_CLASS("abstract class Test "),

        INTERFACE("interface Test ");

        String enclStr;

        EnclosingKind(String enclStr) {

            this.enclStr = enclStr;

        }

    }

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

        //create default shared JavaCompiler - reused across multiple compilations

        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();

        try (StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null)) {

            for (VersionKind vk : VersionKind.values()) {

                for (EnclosingKind ek : EnclosingKind.values()) {

                    for (MethodKind mk : MethodKind.values()) {

                        for (ModifierKind modk1 : ModifierKind.values()) {

                            for (ModifierKind modk2 : ModifierKind.values()) {

                                new TestDefaultMethodsSyntax(vk, ek, mk, modk1, modk2).run(comp, fm);

                            }

                        }

                    }

                }

            }

            System.out.println("Total check executed: " + checkCount);

        }

    }

    VersionKind vk;

    EnclosingKind ek;

    MethodKind mk;

    ModifierKind modk1, modk2;

    JavaSource source;

    DiagnosticChecker diagChecker;

    TestDefaultMethodsSyntax(VersionKind vk, EnclosingKind ek, MethodKind mk, ModifierKind modk1, ModifierKind modk2) {

        this.vk = vk;

        this.ek = ek;

        this.mk = mk;

        this.modk1 = modk1;

        this.modk2 = modk2;

        this.source = new JavaSource();

        this.diagChecker = new DiagnosticChecker();

    }

    class JavaSource extends SimpleJavaFileObject {

        String template = "#EK {\n" +

                          "   #MOD1 #MOD2 #METH\n" +

                          "}\n";

        String source;

        public JavaSource() {

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

            source = template.replaceAll("#EK", ek.enclStr)

                    .replaceAll("#MOD1", modk1.modStr)

                    .replaceAll("#MOD2", modk2.modStr)

                    .replaceAll("#METH", mk.methStr);

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return source;

        }

    }

    void run(JavaCompiler tool, StandardJavaFileManager fm) throws Exception {

        JavacTask ct = (JavacTask)tool.getTask(null, fm, diagChecker,

                vk.getOptions(), null, Arrays.asList(source));

        try {

            ct.analyze();

        } catch (Throwable ex) {

            throw new AssertionError("Error thrown when analyzing the following source:\n" + source.getCharContent(true));

        }

        check();

    }

    void check() {

        boolean errorExpected = !ModifierKind.compatible(modk1, modk2, ek);

        errorExpected |= !ModifierKind.compatible(mk, modk1, modk2, ek);

        errorExpected |= !modk1.compatible(ek) || !modk2.compatible(ek);

        errorExpected |= ModifierKind.intersect(ModifierKind.DEFAULT, modk1, modk2) &&

                vk == VersionKind.PRE_LAMBDA;

        errorExpected |= ModifierKind.intersect(ModifierKind.STATIC, modk1, modk2) &&

                ek == EnclosingKind.INTERFACE && vk == VersionKind.PRE_LAMBDA;

        errorExpected |= ModifierKind.intersect(ModifierKind.PRIVATE, modk1, modk2) &&

                ek == EnclosingKind.INTERFACE && (vk == VersionKind.LAMBDA || vk == VersionKind.PRE_LAMBDA);

        checkCount++;

        if (diagChecker.errorFound != errorExpected) {

            throw new AssertionError("Problem when compiling source:\n" + source.getCharContent(true) +

                    "\nfound error: " + diagChecker.errorFound);

        }

    }

    static class DiagnosticChecker implements javax.tools.DiagnosticListener<JavaFileObject> {

        boolean errorFound;

        public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

            if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {

                errorFound = true;

            }

        }

    }

}