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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug 8174840
 * @library /tools/javac/lib
 * @build   JavacTestingAbstractProcessor TestOverrides
 * @compile -processor TestOverrides -proc:only S.java
 */

import java.util.Set;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;

import static javax.lang.model.element.ElementKind.METHOD;

public class TestOverrides extends JavacTestingAbstractProcessor {

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment round) {
        if (!round.processingOver()) {
            var sm = mIn(elements.getTypeElement("S"));
            for (var subtypeName : new String[]{"T1", "T2", "T3", "T4", "T5"}) {
                var t = elements.getTypeElement(subtypeName);
                var tm = mIn(t);
                if (!elements.overrides(tm, sm, t))
                    messager.printError(String.format(
                            "%s does not override from %s method %s", tm, t.getQualifiedName(), sm));
            }
        }
        return true;
    }

    private ExecutableElement mIn(TypeElement t) {
        return t.getEnclosedElements().stream()
                .filter(e -> e.getKind() == METHOD)
                .filter(e -> e.getSimpleName().toString().equals("m"))
                .map(e -> (ExecutableElement) e)
                .findAny()
                .get();
    }
}