return (value == null) || (value.trim().length() < 1);
    }

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

    @Override
    public boolean hasClassifier() {
        return classifier != null && !classifier.isEmpty();
    }

    @Override
    public String getScope() {
        return scope;
    }

    @Override

            projectKeys.add(key);
        }
        return projectKeys;
    }

    public boolean isEmpty() {
        return items.isEmpty();
    }

    /**
     * @return a set of all the projects managed by the build
     */
    public Set<MavenProject> getProjects() {
        return items.stream().map(ProjectSegment::getProject).collect(Collectors.toSet());
    }

    public String getClassifier() {
        return classifier;
    }

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

    public boolean isResolved() {
        return resolved;
    }

    public void setResolved(boolean resolved) {
        this.resolved = resolved;
    }

    public String getUri() {
        return uri;
    }

        return createArtifact(groupId, artifactId, versionRange, type, classifier, scope, inheritedScope, optional);
    }

    public Artifact createBuildArtifact(String groupId, String artifactId, String version, String packaging) {
        return createArtifact(groupId, artifactId, version, null, packaging, null, null);
    }

    public Artifact createProjectArtifact(String groupId, String artifactId, String version) {

    }

    @Override
    public int hashCode() {
        return hashCode;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (obj == null) {
            return false;
        }

        if (!UrlSource.class.equals(obj.getClass())) {
            return false;
        }

    public Artifact getArtifact() {
        return artifact;
    }

    public String getGroupId() {
        return groupId;
    }

    public String getArtifactId() {
        return artifactId;
    }

    public String getVersion() {
        return version;
    }

    public String getType() {
        return type;
    }

    /** @return the classifier */

                return entry.getValue();
            }
        }
        return null;
    }

    @Override
    public List<Exception> getExceptions() {
        return exceptions;
    }

    @Override
    public Node getRoot() {
        return root;
    }

    @Override
    public List<Node> getNodes() {
        return nodes;
    }

    @Override

        exceptions = initList(exceptions);

        exceptions.add(e);

        return this;
    }

    public OverConstrainedVersionException getVersionRangeViolation(int i) {
        return (OverConstrainedVersionException) versionRangeViolations.get(i);
    }

    public List<Exception> getVersionRangeViolations() {
        return versionRangeViolations == null
                ? Collections.emptyList()

            return false;
        } else if (!a.getArtifactId().equals(getArtifactId())) {
            return false;
        } else if (!a.getVersion().equals(getVersion())) {
            return false;
        } else if (!a.getType().equals(getType())) {
            return false;
        } else {
            return a.getClassifier() == null
                    ? getClassifier() == null

        return allRepositories.computeIfAbsent(repository, DefaultRemoteRepository::new);
    }

    @Override
    public Node getNode(org.eclipse.aether.graph.DependencyNode node) {
        return getNode(node, false);
    }

    @Override
    public Node getNode(org.eclipse.aether.graph.DependencyNode node, boolean verbose) {