class ClasspathContainer implements Iterable<ArtifactMetadata> {
    private List<ArtifactMetadata> classpath;

    private ArtifactScopeEnum scope;

    // -------------------------------------------------------------------------------------------
    public ClasspathContainer(ArtifactScopeEnum scope) {
        this.scope = ArtifactScopeEnum.checkScope(scope);
    }

    // -------------------------------------------------------------------------------------------
    public ClasspathContainer(List<ArtifactMetadata> classpath, ArtifactScopeEnum scope) {
        this(scope);
        this.classpath = classpath;
    }

    // -------------------------------------------------------------------------------------------
    public Iterator<ArtifactMetadata> iterator() {
        return classpath == null ? null : classpath.iterator();
    }

    // -------------------------------------------------------------------------------------------
    public ClasspathContainer add(ArtifactMetadata md) {
        if (classpath == null) {
            classpath = new ArrayList<>(16);
        }

        classpath.add(md);

        return this;
    }

    // -------------------------------------------------------------------------------------------
    public List<ArtifactMetadata> getClasspath() {
        return classpath;
    }

    // -------------------------------------------------------------------------------------------
    public MetadataTreeNode getClasspathAsTree() throws MetadataResolutionException {<FILL_FUNCTION_BODY>}

    public void setClasspath(List<ArtifactMetadata> classpath) {
        this.classpath = classpath;
    }

    public ArtifactScopeEnum getScope() {
        return scope;
    }

    public void setScope(ArtifactScopeEnum scope) {
        this.scope = scope;
    }

    // -------------------------------------------------------------------------------------------
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(256);
        sb.append("[scope=").append(scope.getScope());
        if (classpath != null) {
            for (ArtifactMetadata md : classpath) {
                sb.append(": ")
                        .append(md.toString())
                        .append('{')
                        .append(md.getArtifactUri())
                        .append('}');
            }
        }
        sb.append(']');
        return sb.toString();
    }
    // -------------------------------------------------------------------------------------------
    // -------------------------------------------------------------------------------------------
}

        if (classpath == null || classpath.size() < 1) {
            return null;
        }

        MetadataTreeNode tree = null;
        MetadataTreeNode parent = null;

        for (ArtifactMetadata md : classpath) {
            MetadataTreeNode node = new MetadataTreeNode(md, parent, md.isResolved(), md.getArtifactScope());
            if (tree == null) {
                tree = node;
            }

            if (parent != null) {
                parent.setNChildren(1);
                parent.addChild(0, node);
            }

            parent = node;
        }
        return tree;
    
<no_super_class>