/**
 * Interface used to locate the root directory for a given project.
 *
 * The root locator is usually looked up from the plexus container.
 * One notable exception is the computation of the early {@code session.rootDirectory}
 * property which happens very early.  The implementation used in this case
 * will be discovered using the JDK service mechanism.
 *
 * The default implementation will look for a {@code .mvn} child directory

     * instance construction.
     *
     * @param session the Maven session
     * @throws MavenExecutionException in case of issue
     */
    // TODO This is too early for build extensions, so maybe just remove it?
    public void afterSessionStart(MavenSession session) throws MavenExecutionException {
        // do nothing
    }

    /**
     * Invoked after all projects were built.

         */
        EXTERNAL
    }

    /**
     * Reports plugin issues applicable to the plugin as a whole.
     * <p>
     * This method should be used in "early" phase of plugin execution, possibly even when plugin or mojo descriptor
     * does not exist yet. In turn, this method will not record extra information like plugin occurrence or declaration

@Named
public class DefaultRootLocator implements RootLocator {

    public boolean isRootDirectory(Path dir) {
        if (Files.isDirectory(dir.resolve(".mvn"))) {
            return true;
        }
        // we're too early to use the modelProcessor ...
        Path pom = dir.resolve("pom.xml");
        try (InputStream is = Files.newInputStream(pom)) {
            XMLStreamReader parser = new WstxInputFactory().createXMLStreamReader(is);

import org.apache.maven.api.annotations.Consumer;
import org.apache.maven.api.annotations.Experimental;

/**
 * Component able to contribute to Maven session user properties. This SPI component is invoked
 * very early, while there is no session created yet.
 *
 * @since 4.0.0
 */
@Experimental
@Consumer
public interface PropertyContributor extends SpiService {
    /**