test/langtools/tools/javac/modules/DirectiveVisitorTest.java

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 * 2 along with this work; if not, write to the Free Software Foundation,
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import java.io.PrintStream;
import java.nio.file.Path;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;

import javax.lang.model.element.ModuleElement;
import javax.lang.model.element.ModuleElement.Directive;
import javax.lang.model.element.ModuleElement.DirectiveKind;
import javax.lang.model.element.ModuleElement.DirectiveVisitor;
import javax.lang.model.element.ModuleElement.ExportsDirective;
import javax.lang.model.element.ModuleElement.OpensDirective;
import javax.lang.model.element.ModuleElement.ProvidesDirective;
import javax.lang.model.element.ModuleElement.RequiresDirective;
import javax.lang.model.element.ModuleElement.UsesDirective;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

import com.sun.source.util.JavacTask;

/*
 * @test
 * @bug 8175118
 * @summary Add ModuleElement.DirectiveVisitor
 * @library /tools/lib
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.main
 *          jdk.compiler/com.sun.tools.javac.util
 * @build toolbox.ToolBox ModuleTestBase
 * @run main DirectiveVisitorTest
 */

public class DirectiveVisitorTest extends ModuleTestBase {
    public static void main(String... args) throws Exception {
        new DirectiveVisitorTest().runTests();
    }

    @Test
    public void testVisitor(Path base) throws Exception {
        Path src = base.resolve("src");
        Path src_m1 = src.resolve("m1x");
        tb.writeJavaFiles(src_m1,
                          "module m1x { "
                          + " requires m2x;"
                          + " exports p1;"
                          + " opens p2;"
                          + " uses p1.Service;"
                          + " provides p1.Service with p2.Impl;"
                          + "}",
                          "package p1; public interface Service { }",
                          "package p2; public class Impl implements p1.Service { }");
        Path src_m2 = src.resolve("m2x");
        tb.writeJavaFiles(src_m2,
                          "module m2x { }");

        Path modules = base.resolve("modules");
        tb.createDirectories(modules);

        JavaCompiler javac = ToolProvider.getSystemJavaCompiler();
        try (StandardJavaFileManager fm = javac.getStandardFileManager(null, null, null)) {
            Iterable<? extends JavaFileObject> files = fm.getJavaFileObjects(findJavaFiles(src));
            List<String> options = List.of(
                    "--module-source-path", src.toString(),
                    "-d", modules.toString()
            );
            JavacTask t = (JavacTask) javac.getTask(null, fm, null, options, null, files);
            t.analyze();
            ModuleElement e = t.getElements().getModuleElement("m1x");
            Set<DirectiveKind> kinds = EnumSet.<DirectiveKind>allOf(DirectiveKind.class);
            Visitor v = new Visitor();
            v.visit(e, kinds);
            if (!kinds.equals(EnumSet.<DirectiveKind>noneOf(DirectiveKind.class))) {
                error("Some kinds not found: " + kinds);
            }
        }
    }

    static class Visitor implements DirectiveVisitor<Void,Set<DirectiveKind>> {
        private final PrintStream out = System.err;

        public void visit(ModuleElement e, Set<DirectiveKind> kinds) {
            e.getDirectives().stream().forEach(d -> visit(d, kinds));
        }

        @Override
        public Void visitRequires(RequiresDirective d, Set<DirectiveKind> kinds) {
            visitAny(d, kinds);
            return null;
        }

        @Override
        public Void visitExports(ExportsDirective d, Set<DirectiveKind> kinds) {
            visitAny(d, kinds);
            return null;
        }

        @Override
        public Void visitOpens(OpensDirective d, Set<DirectiveKind> kinds) {
            visitAny(d, kinds);
            return null;
        }

        @Override
        public Void visitUses(UsesDirective d, Set<DirectiveKind> kinds) {
            visitAny(d, kinds);
            return null;
        }

        @Override
        public Void visitProvides(ProvidesDirective d, Set<DirectiveKind> kinds) {
            visitAny(d, kinds);
            return null;
        }

        private void visitAny(Directive d, Set<DirectiveKind> kinds) {
            out.println("visit: " + d);
            kinds.remove(d.getKind());
        }
    }
}