import org.apache.maven.internal.impl.model.DefaultModelTransformerContext.Holder;

/**
 * Builds up the transformer context.
 * After the buildplan is ready, the build()-method returns the immutable context useful during distribution.
 * This is an inner class, as it must be able to call readRawModel()
 *
 * @since 4.0.0
 */

     * at the given file or in the given directory.
     */
    @Nullable
    Path locateExistingPom(@Nonnull Path project);

    /**
     * Reads the model from the specified byte stream. The stream will be automatically closed before the method
     * returns.
     *
     * @param request The reader request to deserialize the model, must not be {@code null}.

@Named
@Singleton
public class DefaultMetadataReader implements MetadataReader {

    public Metadata read(File input, Map<String, ?> options) throws IOException {
        Objects.requireNonNull(input, "input cannot be null");

        return read(Files.newInputStream(input.toPath()), options);
    }

    public Metadata read(Reader input, Map<String, ?> options) throws IOException {

            if (inputStream != null) {
                return xml.read(inputStream, request.isStrict());
            } else if (reader != null) {
                return xml.read(reader, request.isStrict());
            } else if (path != null) {
                try (InputStream is = Files.newInputStream(path)) {
                    return xml.read(is, request.isStrict());
                }
            } else {

        final byte[] buffer = new byte[1024 * 32];
        for (; ; ) {
            int read = stream.read(buffer);
            if (read < 0) {
                break;
            }
            for (ChecksumCalculator checksumCalculator : algMap.values()) {
                checksumCalculator.update(ByteBuffer.wrap(buffer, 0, read));
            }
        }

        try (InputStream inputStream = Files.newInputStream(file)) {
            org.apache.maven.model.Model model =
                    new org.apache.maven.model.Model(new MavenStaxReader().read(inputStream));
            project = new MavenProject(model);
            project.setRootDirectory(Paths.get("src/test/resources/consumer/trivial"));
            project.setOriginalModel(model);

                    return PersistedToolchains.newInstance();
                }
                toolchains = request.getSession()
                        .getService(ToolchainsXmlFactory.class)
                        .read(XmlReaderRequest.builder()
                                .inputStream(is)
                                .location(toolchainsSource.getLocation())
                                .strict(true)

            String modelId = "org.apache.maven:maven-model-builder:" + version + "-"
                    + this.getClass().getPackage().getImplementationVersion() + ":super-pom";
            return modelProcessor.read(XmlReaderRequest.builder()
                    .modelId(modelId)
                    .location(url.toExternalForm())
                    .inputStream(is)
                    .strict(false)
                    .build());

            throw new IllegalArgumentException("The POM found does not belong to the given directory: " + pom);
        }
        return pom;
    }

    @Override
    public Model read(XmlReaderRequest request) throws IOException {
        Objects.requireNonNull(request, "source cannot be null");
        Path pomFile = request.getPath();
        if (pomFile != null) {

     */
    public Metadata read(Reader reader) throws IOException, XmlPullParserException {
        try {
            return new Metadata(delegate.read(reader));
        } catch (XMLStreamException e) {
            throw new XmlPullParserException(e.getMessage(), null, e);
        }
    }

    /**
     * Method read.
     *
     * @param in     a in object.
     * @param strict a strict object.