// workspace
        if (source == null) {
            try {
                source = container.lookup(ArtifactMetadataSource.class);
            } catch (ComponentLookupException e) {
                // won't happen
            }
        }

        if (listeners == null) {
            listeners = new ArrayList<>();

            if (logger.isDebugEnabled()) {

                messageBuffer
                        .append("<configuration>")
                        .append(LS)
                        .append("  ...")
                        .append(LS);
                messageBuffer
                        .append("  <")
                        .append(alias)
                        .append(">VALUE</")
                        .append(alias)

        return append(value, start, end);
    }

    /**
     * Append content to the message buffer.
     *
     * @param value the content to append
     * @return the current builder
     */
    @Nonnull
    default MessageBuilder a(CharSequence value) {
        return append(value);
    }

    /**
     * Append content to the message buffer.
     *
     * @param value the content to append

        sb.append("      id: ").append(getId()).append(LS);
        sb.append("      url: ").append(getUrl()).append(LS);
        sb.append("   layout: ").append(layout != null ? layout : "none");

        if (proxy != null) {
            sb.append(LS)
                    .append("    proxy: ")
                    .append(proxy.getHost())
                    .append(':')

                .append(":")
                .append(dependency.getVersion())
                .append("@")
                .append(dependency.getScope() == null ? "compile" : dependency.getScope());
        if (dependency.isOptional()) {
            stringBuilder.append("[optional]");
        }
        if (!dependency.getExclusions().isEmpty()) {
            stringBuilder.append("[").append(dependency.getExclusions().size()).append(" exclusions]");

        path.append(artifact.getArtifactId()).append(ARTIFACT_SEPARATOR).append(artifact.getVersion());

        if (artifact.hasClassifier()) {
            path.append(ARTIFACT_SEPARATOR).append(artifact.getClassifier());
        }

        if (artifactHandler.getExtension() != null
                && !artifactHandler.getExtension().isEmpty()) {

            for (ModelProblem problem : problems) {
                sb.append(System.lineSeparator());
                sb.append("    - [");
                sb.append(problem.getSeverity());
                sb.append("] ");
                sb.append(problem.getMessage());
                String loc = Stream.of(
                                problem.getModelId().equals(modelId) ? problem.getModelId() : "",

public class MappedList<U, V> extends AbstractList<U> {
    private final List<V> list;
    private final Function<V, U> mapper;

    public MappedList(List<V> list, Function<V, U> mapper) {
        this.list = list;
        this.mapper = mapper;
    }

    @Override
    public U get(int index) {
        return mapper.apply(list.get(index));
    }

    @Override
    public int size() {
        return list.size();
    }

        if (artifacts != null) {
            int i = 1;
            sb.append("---------").append(LS);
            sb.append(artifacts.size()).append(LS);
            for (Artifact a : artifacts) {
                sb.append(i).append(' ').append(a).append(LS);
                i++;
            }
            sb.append("---------");
        }

        return sb.toString();
    }

            StringBuilder buf = new StringBuilder(256);
            buf.append('[');
            for (int i = 0; i < n; i++) {
                if (i > 0) {
                    buf.append(", ");
                }
                buf.append(String.valueOf(Array.get(obj, i)));
            }
            buf.append(']');
            str = buf.toString();
        } else {
            str = String.valueOf(obj);