gistfile1.java

public interface Vertex extends Element {

    static final String V = "v";
    static final String L_BRACKET = "[";
    static final String R_BRACKET = "]";

    public default Set<String> getPropertyKeys() {
        return this.getProperties().keySet();
    }

    public Map<String, Iterable<Vertex.Property>> getProperties();

    public <V> Iterable<Vertex.Property<V>> getProperties(String key);

    public default <V> Iterable<V> getValues(String key) {
        return () -> (Iterator) StreamFactory.stream(getProperties(key)).filter(p -> p.isPresent()).map(p -> p.<V>getValue()).iterator();
    }

    public <V> Vertex.Property<V> getProperty(String key);

    public <V> Vertex.Property<V> setProperty(String key, V value);

    public <V> Vertex.Property<V> addProperty(String key, V value);

    public VertexQuery query();

    public Edge addEdge(String label, Vertex inVertex, Object... keyValues);

    public default String toString() {
        return V + L_BRACKET + this.getId() + R_BRACKET;
    }