/*

 * Copyright (c) 2012, 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 8005166

 * @summary Add support for static interface methods

 *          Smoke test for static interface method hiding

 */

import com.sun.source.util.JavacTask;

import java.net.URI;

import java.util.Arrays;

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 InterfaceMethodHidingTest {

    static int checkCount = 0;

    enum SignatureKind {

        VOID_INTEGER("void m(Integer s)", "return;"),

        STRING_INTEGER("String m(Integer s)", "return null;"),

        VOID_STRING("void m(String s)", "return;"),

        STRING_STRING("String m(String s)", "return null;");

        String sigStr;

        String retStr;

        SignatureKind(String sigStr, String retStr) {

            this.sigStr = sigStr;

            this.retStr = retStr;

        }

        boolean overrideEquivalentWith(SignatureKind s2) {

            switch (this) {

                case VOID_INTEGER:

                case STRING_INTEGER:

                    return s2 == VOID_INTEGER || s2 == STRING_INTEGER;

                case VOID_STRING:

                case STRING_STRING:

                    return s2 == VOID_STRING || s2 == STRING_STRING;

                default:

                    throw new AssertionError("bad signature kind");

            }

        }

    }

    enum MethodKind {

        VIRTUAL("", "#M #S;"),

        STATIC("static", "#M #S { #BE; #R }"),

        DEFAULT("default", "#M #S { #BE; #R }");

        String modStr;

        String methTemplate;

        MethodKind(String modStr, String methTemplate) {

            this.modStr = modStr;

            this.methTemplate = methTemplate;

        }

        boolean inherithed() {

            return this != STATIC;

        }

        static boolean overrides(MethodKind mk1, SignatureKind sk1, MethodKind mk2, SignatureKind sk2) {

            return sk1 == sk2 &&

                    mk2.inherithed() &&

                    mk1 != STATIC;

        }

        String getBody(BodyExpr be, SignatureKind sk) {

            return methTemplate.replaceAll("#BE", be.bodyExprStr)

                    .replaceAll("#R", sk.retStr)

                    .replaceAll("#M", modStr)

                    .replaceAll("#S", sk.sigStr);

        }

    }

    enum BodyExpr {

        NONE(""),

        THIS("Object o = this");

        String bodyExprStr;

        BodyExpr(String bodyExprStr) {

            this.bodyExprStr = bodyExprStr;

        }

        boolean allowed(MethodKind mk) {

            return this == NONE ||

                    mk != MethodKind.STATIC;

        }

    }

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

        //create default shared JavaCompiler - reused across multiple compilations

        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();

        StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null);

        for (MethodKind mk1 : MethodKind.values()) {

            for (SignatureKind sk1 : SignatureKind.values()) {

                for (BodyExpr be1 : BodyExpr.values()) {

                    for (MethodKind mk2 : MethodKind.values()) {

                        for (SignatureKind sk2 : SignatureKind.values()) {

                            for (BodyExpr be2 : BodyExpr.values()) {

                                for (MethodKind mk3 : MethodKind.values()) {

                                    for (SignatureKind sk3 : SignatureKind.values()) {

                                        for (BodyExpr be3 : BodyExpr.values()) {

                                            new InterfaceMethodHidingTest(mk1, mk2, mk3, sk1, sk2, sk3, be1, be2, be3).run(comp, fm);

                                        }

                                    }

                                }

                            }

                        }

                    }

                }

            }

        }

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

    }

    MethodKind mk1, mk2, mk3;

    SignatureKind sk1, sk2, sk3;

    BodyExpr be1, be2, be3;

    JavaSource source;

    DiagnosticChecker diagChecker;

    InterfaceMethodHidingTest(MethodKind mk1, MethodKind mk2, MethodKind mk3,

            SignatureKind sk1, SignatureKind sk2, SignatureKind sk3, BodyExpr be1, BodyExpr be2, BodyExpr be3) {

        this.mk1 = mk1;

        this.mk2 = mk2;

        this.mk3 = mk3;

        this.sk1 = sk1;

        this.sk2 = sk2;

        this.sk3 = sk3;

        this.be1 = be1;

        this.be2 = be2;

        this.be3 = be3;

        this.source = new JavaSource();

        this.diagChecker = new DiagnosticChecker();

    }

    class JavaSource extends SimpleJavaFileObject {

        String template = "interface Sup {\n" +

                          "   default void sup() { }\n" +

                          "}\n" +

                          "interface A extends Sup {\n" +

                          "   #M1\n" +

                          "}\n" +

                          "interface B extends A, Sup {\n" +

                          "   #M2\n" +

                          "}\n" +

                          "interface C extends B, Sup {\n" +

                          "   #M3\n" +

                          "}\n";

        String source;

        public JavaSource() {

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

            source = template.replaceAll("#M1", mk1.getBody(be1, sk1))

                    .replaceAll("#M2", mk2.getBody(be2, sk2))

                    .replaceAll("#M3", mk3.getBody(be3, sk3));

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return source;

        }

    }

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

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

                Arrays.asList("-XDallowStaticInterfaceMethods"), 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 =

                !be1.allowed(mk1) || !be2.allowed(mk2) || !be3.allowed(mk3);

        if (mk1.inherithed()) {

            errorExpected |=

                    sk2.overrideEquivalentWith(sk1) && !MethodKind.overrides(mk2, sk2, mk1, sk1) ||

                    sk3.overrideEquivalentWith(sk1) && !MethodKind.overrides(mk3, sk3, mk1, sk1);

        }

        if (mk2.inherithed()) {

            errorExpected |=

                    sk3.overrideEquivalentWith(sk2) && !MethodKind.overrides(mk3, sk3, mk2, sk2);

        }

        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;

            }

        }

    }

}