| Modifier and Type | Method and Description | 
|---|---|
| Vertex | Result. getVertex()Gets the result item by casting it to a  Vertex. | 
| Modifier and Type | Field and Description | 
|---|---|
| Supplier<? extends Traversal<Vertex,Edge>> | MessageScope.Local. incidentTraversal | 
| Modifier and Type | Method and Description | 
|---|---|
| Traversal<Vertex,Edge> | MessageScope.Local.ReverseTraversalSupplier. get() | 
| Supplier<? extends Traversal<Vertex,Edge>> | MessageScope.Local. getIncidentTraversal() | 
| Iterable<Vertex> | MessageScope.Global. vertices() | 
| Modifier and Type | Method and Description | 
|---|---|
| void | VertexProgram. execute(Vertex vertex,
       Messenger<M> messenger,
       Memory memory)This method denotes the main body of the computation and is executed on each vertex in the graph. | 
| default void | MapReduce. map(Vertex vertex,
   MapReduce.MapEmitter<MK,MV> emitter)The map() method is logically executed at all vertices in the graph in parallel. | 
| static MessageScope.Global | MessageScope.Global. of(Vertex... vertices) | 
| Modifier and Type | Method and Description | 
|---|---|
| static MessageScope.Global | MessageScope.Global. of(Iterable<Vertex> vertices) | 
| static <M> MessageScope.Local<M> | MessageScope.Local. of(Supplier<? extends Traversal<Vertex,Edge>> incidentTraversal) | 
| static <M> MessageScope.Local<M> | MessageScope.Local. of(Supplier<? extends Traversal<Vertex,Edge>> incidentTraversal,
  BiFunction<M,Edge,M> edgeFunction) | 
| Modifier and Type | Method and Description | 
|---|---|
| void | PeerPressureVertexProgram. execute(Vertex vertex,
       Messenger<org.javatuples.Pair<Serializable,Double>> messenger,
       Memory memory) | 
| Modifier and Type | Method and Description | 
|---|---|
| PeerPressureVertexProgram.Builder | PeerPressureVertexProgram.Builder. traversal(Traversal.Admin<Vertex,Edge> traversal) | 
| Modifier and Type | Method and Description | 
|---|---|
| void | PageRankVertexProgram. execute(Vertex vertex,
       Messenger<Double> messenger,
       Memory memory) | 
| Modifier and Type | Method and Description | 
|---|---|
| PageRankVertexProgram.Builder | PageRankVertexProgram.Builder. traversal(Traversal.Admin<Vertex,Edge> traversal) | 
| Modifier and Type | Method and Description | 
|---|---|
| void | TraversalVertexProgram. execute(Vertex vertex,
       Messenger<org.apache.tinkerpop.gremlin.process.traversal.traverser.util.TraverserSet<?>> messenger,
       Memory memory) | 
| Modifier and Type | Method and Description | 
|---|---|
| void | TraversalSideEffects. setLocalVertex(Vertex vertex)In a distributed  GraphComputertraversal, the sideEffects of the traversal are not a single object within a single JVM. | 
| Modifier and Type | Method and Description | 
|---|---|
| default GraphTraversal<S,Vertex> | GraphTraversal. addV() | 
| default GraphTraversal<S,Vertex> | GraphTraversal. addV(Object... propertyKeyValues)Deprecated. 
 As of release 3.1.0, replaced by  GraphTraversal.addV() | 
| default GraphTraversal<S,Vertex> | GraphTraversal. addV(String vertexLabel) | 
| default GraphTraversal<S,Vertex> | GraphTraversal. both(String... edgeLabels)Map the  Vertexto its adjacent vertices given the edge labels. | 
| default GraphTraversal<S,Vertex> | GraphTraversal. bothV()Map the  Edgeto its incident vertices. | 
| default GraphTraversal<S,Vertex> | GraphTraversal. in(String... edgeLabels)Map the  Vertexto its incoming adjacent vertices given the edge labels. | 
| default GraphTraversal<S,Vertex> | GraphTraversal. inV() | 
| default GraphTraversal<S,Vertex> | GraphTraversal. otherV()Map the  Edgeto the incident vertex that was not just traversed from in the path history. | 
| default GraphTraversal<S,Vertex> | GraphTraversal. out(String... edgeLabels)Map the  Vertexto its outgoing adjacent vertices given the edge labels. | 
| default GraphTraversal<S,Vertex> | GraphTraversal. outV() | 
| default GraphTraversal<S,Vertex> | GraphTraversal. to(Direction direction,
  String... edgeLabels)Map the  Vertexto its adjacent vertices given a direction and edge labels. | 
| default GraphTraversal<S,Vertex> | GraphTraversal. toV(Direction direction)Map the  Edgeto its incident vertices given the direction. | 
| default GraphTraversal<S,Vertex> | GraphTraversal. V(Object... vertexIdsOrElements) | 
| Modifier and Type | Method and Description | 
|---|---|
| default GraphTraversal<S,E> | GraphTraversal. from(Traversal<E,Vertex> fromVertex) | 
| default GraphTraversal<S,E> | GraphTraversal. to(Traversal<E,Vertex> toVertex) | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | Graph. addVertex(Object... keyValues)Add a  Vertexto the graph given an optional series of key/value pairs. | 
| default Vertex | Graph. addVertex(String label)Add a  Vertexto the graph with provided vertex label. | 
| Vertex | VertexProperty. element()Gets the  Vertexthat owns thisVertexProperty. | 
| default Vertex | Edge. inVertex()Get the incoming/head vertex of this edge. | 
| default Vertex | Edge. outVertex()Get the outgoing/tail vertex of this edge. | 
| Modifier and Type | Method and Description | 
|---|---|
| default Iterator<Vertex> | Edge. bothVertices()Get both the outgoing and incoming vertices of this edge. | 
| Iterator<Vertex> | Edge. vertices(Direction direction)Retrieve the vertex (or vertices) associated with this edge as defined by the direction. | 
| Iterator<Vertex> | Vertex. vertices(Direction direction,
        String... edgeLabels)Gets an  Iteratorof adjacent vertices. | 
| Iterator<Vertex> | Graph. vertices(Object... vertexIds)Get the  Vertexobjects in this graph with the provided vertex ids. | 
| Modifier and Type | Method and Description | 
|---|---|
| Edge | Vertex. addEdge(String label,
       Vertex inVertex,
       Object... keyValues)Add an outgoing edge to the vertex with provided label and edge properties as key/value pairs. | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | GraphReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Reads a single vertex from an  InputStream. | 
| Vertex | GraphReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Reads a single vertex from an  InputStream. | 
| Modifier and Type | Method and Description | 
|---|---|
| Iterator<Vertex> | GraphReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Reads a set of one or more vertices from an  InputStreamwhich were written byGraphWriter.writeVertices(OutputStream, Iterator). | 
| Modifier and Type | Method and Description | 
|---|---|
| void | GraphWriter. writeVertex(OutputStream outputStream,
           Vertex v)Write a vertex to a stream without writing its edges. | 
| void | GraphWriter. writeVertex(OutputStream outputStream,
           Vertex v,
           Direction direction)Write a vertex to a stream with its associated edges. | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | GraphReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Reads a single vertex from an  InputStream. | 
| Vertex | GraphReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Reads a single vertex from an  InputStream. | 
| Vertex | GraphReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Reads a single vertex from an  InputStream. | 
| Vertex | GraphReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Reads a single vertex from an  InputStream. | 
| Iterator<Vertex> | GraphReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Reads a set of one or more vertices from an  InputStreamwhich were written byGraphWriter.writeVertices(OutputStream, Iterator). | 
| Iterator<Vertex> | GraphReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Reads a set of one or more vertices from an  InputStreamwhich were written byGraphWriter.writeVertices(OutputStream, Iterator). | 
| default void | GraphWriter. writeVertices(OutputStream outputStream,
             Iterator<Vertex> vertexIterator)Write a vertex to a stream without writing its edges. | 
| default void | GraphWriter. writeVertices(OutputStream outputStream,
             Iterator<Vertex> vertexIterator,
             Direction direction)Write a list of vertices from a  Traversalto a stream with its associated edges. | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | GraphMLReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)This method is not supported for this reader. | 
| Vertex | GraphMLReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)This method is not supported for this reader. | 
| Modifier and Type | Method and Description | 
|---|---|
| Iterator<Vertex> | GraphMLReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)This method is not supported for this reader. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | GraphMLWriter. writeVertex(OutputStream outputStream,
           Vertex v)This method is not supported for this writer. | 
| void | GraphMLWriter. writeVertex(OutputStream outputStream,
           Vertex v,
           Direction direction)This method is not supported for this writer. | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | GraphMLReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)This method is not supported for this reader. | 
| Vertex | GraphMLReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)This method is not supported for this reader. | 
| Vertex | GraphMLReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)This method is not supported for this reader. | 
| Vertex | GraphMLReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)This method is not supported for this reader. | 
| Iterator<Vertex> | GraphMLReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)This method is not supported for this reader. | 
| Iterator<Vertex> | GraphMLReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)This method is not supported for this reader. | 
| void | GraphMLWriter. writeVertices(OutputStream outputStream,
             Iterator<Vertex> vertexIterator)This method is not supported for this writer. | 
| void | GraphMLWriter. writeVertices(OutputStream outputStream,
             Iterator<Vertex> vertexIterator,
             Direction direction)This method is not supported for this writer. | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | GraphSONReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Read a  Vertexfrom output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| Vertex | GraphSONReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Read a  Vertexfrom output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| Modifier and Type | Method and Description | 
|---|---|
| Iterator<Vertex> | GraphSONReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Read  Vertexobjects from output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| Modifier and Type | Method and Description | 
|---|---|
| void | GraphSONWriter. writeVertex(OutputStream outputStream,
           Vertex v)Writes a single  Vertexwith no edges serialized. | 
| void | GraphSONWriter. writeVertex(OutputStream outputStream,
           Vertex v,
           Direction direction)Writes a single  Vertexto stream where edges only from the specified direction are written. | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | GraphSONReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Read a  Vertexfrom output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| Vertex | GraphSONReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Read a  Vertexfrom output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| Vertex | GraphSONReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Read a  Vertexfrom output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| Vertex | GraphSONReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Read a  Vertexfrom output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| Iterator<Vertex> | GraphSONReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Read  Vertexobjects from output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| Iterator<Vertex> | GraphSONReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Read  Vertexobjects from output generated by any of theGraphSONWriterwriteVertexorwriteVerticesmethods or byGraphSONWriter.writeGraph(OutputStream, Graph). | 
| void | GraphSONWriter. writeVertices(OutputStream outputStream,
             Iterator<Vertex> vertexIterator)Writes a list of vertices without edges. | 
| void | GraphSONWriter. writeVertices(OutputStream outputStream,
             Iterator<Vertex> vertexIterator,
             Direction direction)Writes a list of vertices in adjacency list format where vertices are written with edges from both
 directions. | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | GryoReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Read a  Vertexfrom output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| Vertex | GryoReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Read a  Vertexfrom output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| Modifier and Type | Method and Description | 
|---|---|
| Iterator<Vertex> | GryoReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Read  Vertexobjects from output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| Modifier and Type | Method and Description | 
|---|---|
| void | GryoWriter. writeVertex(OutputStream outputStream,
           Vertex v)Write a vertex to a stream without writing its edges. | 
| void | GryoWriter. writeVertex(OutputStream outputStream,
           Vertex v,
           Direction direction)Write a vertex to a stream with its associated edges. | 
| Modifier and Type | Method and Description | 
|---|---|
| Vertex | GryoReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Read a  Vertexfrom output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| Vertex | GryoReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod)Read a  Vertexfrom output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| Vertex | GryoReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Read a  Vertexfrom output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| Vertex | GryoReader. readVertex(InputStream inputStream,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
          Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
          Direction attachEdgesOfThisDirection)Read a  Vertexfrom output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| Iterator<Vertex> | GryoReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Read  Vertexobjects from output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| Iterator<Vertex> | GryoReader. readVertices(InputStream inputStream,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Vertex>,Vertex> vertexAttachMethod,
            Function<org.apache.tinkerpop.gremlin.structure.util.Attachable<Edge>,Edge> edgeAttachMethod,
            Direction attachEdgesOfThisDirection)Read  Vertexobjects from output generated by any of theGryoWriterwriteVertexorwriteVerticesmethods or byGryoWriter.writeGraph(OutputStream, Graph). | 
| void | GryoWriter. writeVertices(OutputStream outputStream,
             Iterator<Vertex> vertexIterator)Write a vertex to a stream without writing its edges. | 
| void | GryoWriter. writeVertices(OutputStream outputStream,
             Iterator<Vertex> vertexIterator,
             Direction direction)Write a list of vertices from a  Traversalto a stream with its associated edges. | 
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