test/langtools/tools/javac/processing/model/util/types/TestPseudoTypeHandling.java

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/*
 * @test
 * @bug 8175335
 * @summary Test Types methods on module and package TypeMirrors
 * @author  Joseph D. Darcy
 * @library /tools/javac/lib
 * @modules jdk.compiler
 * @build   JavacTestingAbstractProcessor TestPseudoTypeHandling
 * @compile -processor TestPseudoTypeHandling -proc:only TestPseudoTypeHandling.java
 */

import java.util.*;
import java.util.function.*;
import static java.util.Objects.*;
import javax.annotation.processing.*;
import javax.lang.model.element.*;
import javax.lang.model.type.*;
import javax.lang.model.util.*;

/**
 * Test basic handling of module type.
 */
public class TestPseudoTypeHandling extends JavacTestingAbstractProcessor {
    public boolean process(Set<? extends TypeElement> annotations,
                           RoundEnvironment roundEnv) {
        if (!roundEnv.processingOver()) {
            TypeMirror objectType  = requireNonNull(eltUtils.getTypeElement("java.lang.Object")).asType();

            List<TypeMirror> typeMirrorsToTest =
                List.of(requireNonNull(eltUtils.getModuleElement("java.base")).asType(),
                        requireNonNull(eltUtils.getPackageElement("java.lang")).asType());

            for (TypeMirror type : typeMirrorsToTest) {
                expectException(t -> typeUtils.isSubtype(t, objectType), type);
                expectException(t -> typeUtils.isSubtype(objectType, t), type);

                expectException(t -> typeUtils.isAssignable(t, objectType), type);
                expectException(t -> typeUtils.isAssignable(objectType, t), type);

                expectException(t -> typeUtils.contains(t, objectType), type);
                expectException(t -> typeUtils.contains(objectType, t), type);

                expectException(t -> typeUtils.capture(t), type);
                expectException(t -> typeUtils.erasure(t), type);

                expectException(t -> typeUtils.getArrayType(t), type);

                expectException(t -> typeUtils.directSupertypes(t), type);
            }
        }
        return true;
    }

    void expectException(Consumer<TypeMirror> argument, TypeMirror type) {
        try {
            argument.accept(type);
            throw new RuntimeException("Should not reach " + type.toString());
        } catch (IllegalArgumentException e) {
            ; // Expected
        }
    }
}