this.extension = extension;
    }

    @Override
    public String getClassifier() {
        return classifier;
    }

    public void setClassifier(final String classifier) {
        this.classifier = classifier;
    }

    @Override
    public String getDirectory() {
        if (directory == null) {
            return getPackaging() + "s";
        }

      <artifactId>guava-testlib</artifactId>
      <version>${project.version}</version>
      <classifier>tests</classifier>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava-tests</artifactId>
      <version>${project.version}</version>
      <classifier>tests</classifier>
      <scope>test</scope>
    </dependency>
    <dependency>

    private final String extension;
    private final String classifier;
    private final boolean includesDependencies;
    private final Set<PathType> pathTypes;
    private final Map<String, String> properties;

    public DefaultType(
            String id,
            Language language,
            String extension,
            String classifier,
            boolean includesDependencies,

        this.groupId = (groupId != null && !groupId.isEmpty()) ? groupId : null;
        this.artifactId = (artifactId != null && !artifactId.isEmpty()) ? artifactId : null;
        this.classifier = (classifier != null && !classifier.isEmpty()) ? classifier : null;
        this.extension = (extension != null && !extension.isEmpty()) ? extension : null;
        this.version = (version != null && !version.isEmpty()) ? version : null;

    }

    @Override
    public String getDirectory() {
        return directory;
    }

    public void setClassifier(String classifier) {
        this.classifier = classifier;
    }

    @Override
    public String getClassifier() {
        return classifier;
    }

    public void setPackaging(String packaging) {
        this.packaging = packaging;
    }

    @Override

class TransformedArtifactHandler implements ArtifactHandler {

    private final String classifier;

    private final String extension;

    private final String packaging;

    TransformedArtifactHandler(String classifier, String extension, String packaging) {
        this.classifier = classifier;
        this.extension = requireNonNull(extension);
        this.packaging = requireNonNull(packaging);
    }

        String classifier = artifact.getClassifier();
        String extension = artifact.getExtension();
        Path repo = getProjectLocalRepo();
        return repo.resolve(groupId)
                .resolve(artifactId)
                .resolve(version)
                .resolve(artifactId
                        + "-" + version

     */
    @Nonnull
    String getExtension();

    /**
     * Get the default classifier associated to the dependency type.
     * The default classifier can be overridden when specifying
     * the {@link Dependency#getClassifier()}.
     *
     * @return the default classifier, or {@code null}.
     */
    @Nullable
    String getClassifier();

    /**

    public static Object getKey(Artifact artifact) {
        return artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getBaseVersion();
    }

    protected String getKey(String classifier, String extension) {
        return classifier + ':' + extension;
    }

    @Override
    public String getGroupId() {
        return metadata.getGroupId();
    }

    @Override
    public String getArtifactId() {

                        && srcInfo.repository != dstInfo.repository)) {
            infos.put(dstKey, srcInfo);
        }
    }

    private String getKey(String classifier, String extension) {
        return (classifier == null ? "" : classifier.trim()) + ':' + (extension == null ? "" : extension.trim());
    }

    private ArtifactRepository getRepository(