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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

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/**

 * @test

 * @summary Verify that annotation processing works.

 * @library /tools/lib

 * @modules

 *      jdk.compiler/com.sun.tools.javac.api

 *      jdk.compiler/com.sun.tools.javac.main

 * @build toolbox.ToolBox toolbox.JavacTask ModuleTestBase

 * @run main AnnotationProcessing

 */

import java.nio.file.Files;

import java.nio.file.Path;

import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Objects;

import java.util.Set;

import java.util.stream.Collectors;

import javax.annotation.processing.AbstractProcessor;

import javax.annotation.processing.RoundEnvironment;

import javax.annotation.processing.SupportedAnnotationTypes;

import javax.annotation.processing.SupportedOptions;

import javax.lang.model.SourceVersion;

import javax.lang.model.element.Element;

import javax.lang.model.element.ModuleElement;

import javax.lang.model.element.ModuleElement.ProvidesDirective;

import javax.lang.model.element.ModuleElement.UsesDirective;

import javax.lang.model.element.PackageElement;

import javax.lang.model.element.TypeElement;

import javax.lang.model.type.TypeKind;

import javax.lang.model.util.ElementFilter;

import javax.lang.model.util.ElementScanner9;

import toolbox.JavacTask;

import toolbox.Task;

import toolbox.ToolBox;

public class AnnotationProcessing extends ModuleTestBase {

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

        new AnnotationProcessing().runTests();

    }

    @Test

    public void testAPSingleModule(Path base) throws Exception {

        Path moduleSrc = base.resolve("module-src");

        Path m1 = moduleSrc.resolve("m1");

        Path classes = base.resolve("classes");

        Files.createDirectories(classes);

        tb.writeJavaFiles(m1,

                          "module m1 { }",

                          "package impl; public class Impl { }");

        String log = new JavacTask(tb)

                         "-processor", AP.class.getName(),

                         "-AexpectedEnclosedElements=m1=>impl")

                .outdir(classes)

                .files(findJavaFiles(moduleSrc))

                .run()

                .writeAll()

                .getOutput(Task.OutputKind.DIRECT);

        if (!log.isEmpty())

            throw new AssertionError("Unexpected output: " + log);

    }

    @Test

    public void testAPMultiModule(Path base) throws Exception {

        Path moduleSrc = base.resolve("module-src");

        Path m1 = moduleSrc.resolve("m1");

        Path m2 = moduleSrc.resolve("m2");

        Path classes = base.resolve("classes");

        Files.createDirectories(classes);

        tb.writeJavaFiles(m1,

                          "module m1 { }",

                          "package impl1; public class Impl1 { }");

        tb.writeJavaFiles(m2,

                          "module m2 { }",

                          "package impl2; public class Impl2 { }");

        String log = new JavacTask(tb)

                         "-processor", AP.class.getName(),

                         "-AexpectedEnclosedElements=m1=>impl1,m2=>impl2")

                .outdir(classes)

                .files(findJavaFiles(moduleSrc))

                .run()

                .writeAll()

                .getOutput(Task.OutputKind.DIRECT);

        if (!log.isEmpty())

            throw new AssertionError("Unexpected output: " + log);

    }

    @SupportedAnnotationTypes("*")

    @SupportedOptions("expectedEnclosedElements")

    public static final class AP extends AbstractProcessor {

        private Map<String, List<String>> module2ExpectedEnclosedElements;

        @Override

        public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

            if (module2ExpectedEnclosedElements == null) {

                module2ExpectedEnclosedElements = new HashMap<>();

                String expectedEnclosedElements =

                        processingEnv.getOptions().get("expectedEnclosedElements");

                for (String moduleDef : expectedEnclosedElements.split(",")) {

                    String[] module2Packages = moduleDef.split("=>");

                    module2ExpectedEnclosedElements.put(module2Packages[0],

                                                        Arrays.asList(module2Packages[1].split(":")));

                }

            }

            //verify ModuleType and ModuleSymbol behavior:

            for (Element root : roundEnv.getRootElements()) {

                ModuleElement module = processingEnv.getElementUtils().getModuleOf(root);

                assertEquals(TypeKind.MODULE, module.asType().getKind());

                boolean[] seenModule = new boolean[1];

                module.accept(new ElementScanner9<Void, Void>() {

                    @Override

                    public Void visitModule(ModuleElement e, Void p) {

                        seenModule[0] = true;

                        return null;

                    }

                    @Override

                    public Void scan(Element e, Void p) {

                        throw new AssertionError("Shouldn't get here.");

                    }

                }, null);

                assertEquals(true, seenModule[0]);

                List<String> actualElements =

                        module.getEnclosedElements()

                              .stream()

                              .map(s -> (PackageElement) s)

                              .map(p -> p.getQualifiedName().toString())

                              .collect(Collectors.toList());

                assertEquals(module2ExpectedEnclosedElements.remove(module.getQualifiedName().toString()),

                             actualElements);

            }

            if (roundEnv.processingOver()) {

                assertEquals(true, module2ExpectedEnclosedElements.isEmpty());

            }

            return false;

        }

        @Override

        public SourceVersion getSupportedSourceVersion() {

            return SourceVersion.latest();

        }

    }

    @Test

    public void testVerifyUsesProvides(Path base) throws Exception {

        Path moduleSrc = base.resolve("module-src");

        Path m1 = moduleSrc.resolve("m1");

        Path classes = base.resolve("classes");

        Files.createDirectories(classes);

        tb.writeJavaFiles(m1,

                          "module m1 { exports api; uses api.Api; provides api.Api with impl.Impl; }",

                          "package api; public class Api { }",

                          "package impl; public class Impl extends api.Api { }");

        String log = new JavacTask(tb)

                .options("-doe", "-processor", VerifyUsesProvidesAP.class.getName())

                .outdir(classes)

                .files(findJavaFiles(moduleSrc))

                .run()

                .writeAll()

                .getOutput(Task.OutputKind.DIRECT);

        if (!log.isEmpty())

            throw new AssertionError("Unexpected output: " + log);

    }

    @SupportedAnnotationTypes("*")

    public static final class VerifyUsesProvidesAP extends AbstractProcessor {

        @Override

        public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

            TypeElement api = processingEnv.getElementUtils().getTypeElement("api.Api");

            assertNonNull("Cannot find api.Api", api);

            ModuleElement modle = (ModuleElement) processingEnv.getElementUtils().getPackageOf(api).getEnclosingElement();

            assertNonNull("modle is null", modle);

            List<? extends UsesDirective> uses = ElementFilter.usesIn(modle.getDirectives());

            assertEquals(1, uses.size());

            assertEquals("api.Api", uses.iterator().next().getService().getQualifiedName().toString());

            List<? extends ProvidesDirective> provides = ElementFilter.providesIn(modle.getDirectives());

            assertEquals(1, provides.size());

            assertEquals("api.Api", provides.iterator().next().getService().getQualifiedName().toString());

            assertEquals("impl.Impl", provides.iterator().next().getImplementation().getQualifiedName().toString());

            return false;

        }

        @Override

        public SourceVersion getSupportedSourceVersion() {

            return SourceVersion.latest();

        }

    }

    @Test

    public void testPackageNoModule(Path base) throws Exception {

        Path src = base.resolve("src");

        Path classes = base.resolve("classes");

        Files.createDirectories(classes);

        tb.writeJavaFiles(src,

                          "package api; public class Api { }");

        String log = new JavacTask(tb)

                .options("-processor", VerifyPackageNoModule.class.getName(),

                         "-source", "8",

                         "-Xlint:-options")

                .outdir(classes)

                .files(findJavaFiles(src))

                .run()

                .writeAll()

                .getOutput(Task.OutputKind.DIRECT);

        if (!log.isEmpty())

            throw new AssertionError("Unexpected output: " + log);

    }

    @SupportedAnnotationTypes("*")

    public static final class VerifyPackageNoModule extends AbstractProcessor {

        @Override

        public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

            TypeElement api = processingEnv.getElementUtils().getTypeElement("api.Api");

            assertNonNull("Cannot find api.Api", api);

            ModuleElement modle = (ModuleElement) processingEnv.getElementUtils().getPackageOf(api).getEnclosingElement();

            assertNull("modle is not null", modle);

            return false;

        }

        @Override

        public SourceVersion getSupportedSourceVersion() {

            return SourceVersion.latest();

        }

    }

    private static void assertNonNull(String msg, Object val) {

        if (val == null) {

            throw new AssertionError(msg);

        }

    }

    private static void assertNull(String msg, Object val) {

        if (val != null) {

            throw new AssertionError(msg);

        }

    }

    private static void assertEquals(Object expected, Object actual) {

        if (!Objects.equals(expected, actual)) {

            throw new AssertionError("expected: " + expected + "; actual=" + actual);

        }

    }

}