@Override
    MessageBuilder append(char c);

    /**
     * Append content to the message buffer.
     *
     * @param value the content to append
     * @param offset the index of the first {@code char} to append
     * @param len the number of {@code char}s to append
     * @return the current builder
     */
    @Nonnull
    default MessageBuilder a(char[] value, int offset, int len) {

/**
 * FlatRepositoryLayout
 */
@Named("flat")
@Singleton
@Deprecated
public class FlatRepositoryLayout implements ArtifactRepositoryLayout {

    private static final char ARTIFACT_SEPARATOR = '-';

    private static final char GROUP_SEPARATOR = '.';

    public String getId() {
        return "flat";
    }

    public String pathOf(Artifact artifact) {

        Settings settings = new Settings();
        Mirror mirror = new Mirror();
        mirror.setId("local");
        settings.addMirror(mirror);
        mirror = new Mirror();
        mirror.setId("illegal\\:/chars");
        mirror.setUrl("http://void");
        mirror.setMirrorOf("void");
        settings.addMirror(mirror);

        SimpleProblemCollector problems = new SimpleProblemCollector();

        Settings settings = new Settings();
        Mirror mirror = new Mirror();
        mirror.setId("local");
        settings.addMirror(mirror);
        mirror = new Mirror();
        mirror.setId("illegal\\:/chars");
        mirror.setUrl("http://void");
        mirror.setMirrorOf("void");
        settings.addMirror(mirror);

        SimpleProblemCollector problems = new SimpleProblemCollector();

    }

    @Override
    public MessageBuilder append(CharSequence cs, int start, int end) {
        buffer.append(cs, start, end);
        return this;
    }

    @Override
    public MessageBuilder append(char c) {
        buffer.append(c);
        return this;
    }

    @Override
    public MessageBuilder setLength(int length) {
        buffer.setLength(length);
        return this;
    }

    @Override

/**
 */
@Named("default")
@Singleton
public class DefaultRepositoryLayout implements ArtifactRepositoryLayout {
    private static final char PATH_SEPARATOR = '/';

    private static final char GROUP_SEPARATOR = '.';

    private static final char ARTIFACT_SEPARATOR = '-';

    public String getId() {
        return "default";
    }

    public String pathOf(Artifact artifact) {

        public MessageBuilder append(CharSequence cs, int start, int end) {
            builder.append(cs, start, end);
            return this;
        }

        @Override
        public MessageBuilder append(char c) {
            builder.append(c);
            return this;
        }

        @Override
        public MessageBuilder setLength(int length) {
            builder.setLength(length);

        return sb.toString();
    }

    public static List<String> format(String... lines) {
        int size = DEFAULT_MAX_SIZE;
        int remainder = size - 4; // 4 chars = 2 box_char + 2 spaces
        List<String> result = new ArrayList<>();
        StringBuilder sb = new StringBuilder(size);
        // first line
        sb.setLength(0);
        repeat(sb, BOX_CHAR, size);
        result.add(sb.toString());

        String format;
        if (d > 0) {
            // Length 11+ chars
            format = "%d d %02d:%02d h";
        } else if (h > 0) {
            // Length 7 chars
            format = "%2$02d:%3$02d h";
        } else if (m > 0) {
            // Length 9 chars
            format = "%3$02d:%4$02d min";
        } else {
            // Length 7-8 chars
            format = "%4$d.%5$03d s";
        }

    void testReadMultiDoc() throws Exception {
        String doc = "<?xml version='1.0'?><doc><child>foo</child></doc>";
        StringReader r = new StringReader(doc + doc) {
            @Override
            public int read(char[] cbuf, int off, int len) throws IOException {
                return super.read(cbuf, off, 1);
            }
        };
        XmlNode node1 = XmlNodeBuilder.build(r);
        XmlNode node2 = XmlNodeBuilder.build(r);