org.apache.tinkerpop.gremlin.structure.io

## Interface GraphWriter

- All Known Implementing Classes:
    GraphMLWriter, GraphSONWriter, GryoWriter

      public interface GraphWriter

  Functions for writing a graph and its elements to a serialized format. Implementations of this class do not need to explicitly guarantee that an object written with one method must have its format equivalent to another. In other words, calling `writeVertex(OutputStream, Vertex)`} need not have equivalent output to `writeObject(OutputStream, Object)`. Nor does the representation of an `Edge` within the output of `writeVertex(OutputStream, Vertex, Direction)` need to match the representation of that same `Edge` when provided to `writeEdge(OutputStream, Edge)`. In other words, implementations are free to optimize as is possible for a specific serialization method.

  That said, it is however important that the complementary "read" operation in `GraphReader` be capable of reading the output of the writer. In other words, the output of `writeObject(OutputStream, Object)` should always be readable by `GraphReader.readObject(InputStream, Class)` and the output of `writeGraph(OutputStream, Graph)` should always be readable by `GraphReader.readGraph(InputStream, Graph)`.
  Author:
    Stephen Mallette (http://stephen.genoprime.com)

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface and Description
    --- | ---
    `static interface` | `GraphWriter.WriterBuilder<T extends GraphWriter>` Largely a marker interface for builder classes that construct a `GraphWriter`.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Default Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `writeEdge(OutputStream outputStream, Edge e)` Write an edge to a stream.
    `void` | `writeGraph(OutputStream outputStream, Graph g)` Write the entire graph to a stream.
    `void` | `writeObject(OutputStream outputStream, Object object)` Writes an arbitrary object to the stream.
    `void` | `writeProperty(OutputStream outputStream, Property p)` Write a property to a stream.
    `void` | `writeVertex(OutputStream outputStream, Vertex v)` Write a vertex to a stream without writing its edges.
    `void` | `writeVertex(OutputStream outputStream, Vertex v, Direction direction)` Write a vertex to a stream with its associated edges.
    `void` | `writeVertexProperty(OutputStream outputStream, VertexProperty vp)` Write a vertex property to a stream.
    `default void` | `writeVertices(OutputStream outputStream, Iterator<Vertex> vertexIterator)` Write a vertex to a stream without writing its edges.
    `default void` | `writeVertices(OutputStream outputStream, Iterator<Vertex> vertexIterator, Direction direction)` Write a list of vertices from a `Traversal` to a stream with its associated edges.

- - ### Method Detail

    - #### writeGraph

          void writeGraph(OutputStream outputStream,
                          Graph g)
                   throws IOException

      Write the entire graph to a stream.
      Parameters:
        `outputStream` - the stream to write to.
        `g` - the graph to write to stream.
      Throws:
        `IOException`

    - #### writeVertex

          void writeVertex(OutputStream outputStream,
                           Vertex v,
                           Direction direction)
                    throws IOException

      Write a vertex to a stream with its associated edges. Only write edges as defined by the requested direction.
      Parameters:
        `outputStream` - the stream to write to.
        `v` - the vertex to write.
        `direction` - the direction of edges to write or null if no edges are to be written.
      Throws:
        `IOException`

    - #### writeVertex

          void writeVertex(OutputStream outputStream,
                           Vertex v)
                    throws IOException

      Write a vertex to a stream without writing its edges.
      Parameters:
        `outputStream` - the stream to write to.
        `v` - the vertex to write.
      Throws:
        `IOException`

    - #### writeVertices

          default void writeVertices(OutputStream outputStream,
                                     Iterator<Vertex> vertexIterator,
                                     Direction direction)
                              throws IOException

      Write a list of vertices from a `Traversal` to a stream with its associated edges. Only write edges as defined by the requested direction.
      Parameters:
        `outputStream` - the stream to write to.
        `vertexIterator` - a traversal that returns a list of vertices.
        `direction` - the direction of edges to write or null if no edges are to be written.
      Throws:
        `IOException`

    - #### writeVertices

          default void writeVertices(OutputStream outputStream,
                                     Iterator<Vertex> vertexIterator)
                              throws IOException

      Write a vertex to a stream without writing its edges.
      Parameters:
        `outputStream` - the stream to write to.
        `vertexIterator` - a iterator that returns a list of vertices.
      Throws:
        `IOException`

    - #### writeEdge

          void writeEdge(OutputStream outputStream,
                         Edge e)
                  throws IOException

      Write an edge to a stream.
      Parameters:
        `outputStream` - the stream to write to.
        `e` - the edge to write.
      Throws:
        `IOException`

    - #### writeVertexProperty

          void writeVertexProperty(OutputStream outputStream,
                                   VertexProperty vp)
                            throws IOException

      Write a vertex property to a stream.
      Parameters:
        `outputStream` - the stream to write to.
        `vp` - the vertex property to write.
      Throws:
        `IOException`

    - #### writeProperty

          void writeProperty(OutputStream outputStream,
                             Property p)
                      throws IOException

      Write a property to a stream.
      Parameters:
        `outputStream` - the stream to write to.
        `p` - the property to write.
      Throws:
        `IOException`

    - #### writeObject

          void writeObject(OutputStream outputStream,
                           Object object)
                    throws IOException

      Writes an arbitrary object to the stream.
      Parameters:
        `outputStream` - the stream to write to.
        `object` - the object to write which will use the standard serializer set.
      Throws:
        `IOException`

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