import static org.gradle.util.internal.GroovyDependencyUtil.groovyModuleDependency;

public class GroovyJarFile {
    private static final Pattern FILE_NAME_PATTERN = Pattern.compile("(groovy(?:-all)?)-(\\d.*?)(-indy)?.jar");

    private final File file;
    private final Matcher matcher;

    private GroovyJarFile(File file, Matcher matcher) {
        this.file = file;
        this.matcher = matcher;
    }

    def "parse non-Groovy file"() {
        expect:
        GroovyJarFile.parse(new File("groovy-other-2.0.5.jar")) == null
        GroovyJarFile.parse(new File("groovy-2.0.5.zip")) == null
    }

    def "parse 'groovy' Jar"(String fileName, String version, String dependencyNotation) {
        def jar = GroovyJarFile.parse(new File("$fileName"))

        expect:
        jar != null

            .map(libName -> libName + "-" + groovyVersion + ".jar")
            .collect(toSet());
    }

    @Nullable
    private static GroovyJarFile findGroovyJarFile(Iterable<File> classpath) {
        for (File file : classpath) {
            GroovyJarFile groovyJar = GroovyJarFile.parse(file);
            if (groovyJar != null) {
                return groovyJar;
            }
        }
        return null;
    }

Class <org.gradle.api.internal.plugins.GroovyJarFile> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (GroovyJarFile.java:0)