gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/util/star/StarGraphGraphSONSerializerV4.java [113:158]:
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    private void writeEdges(final DirectionalStarGraph directionalStarGraph, final JsonGenerator jsonGenerator,
                            final SerializerProvider serializerProvider,
                            final TypeSerializer typeSerializer,
                            final Direction direction)  throws IOException, JsonProcessingException {
        // only write edges if there are some AND if the user requested them to be serialized AND if they match
        // the direction being serialized by the format
        final StarGraph starGraph = directionalStarGraph.getStarGraphToSerialize();
        final Direction edgeDirectionToSerialize = directionalStarGraph.getDirection();
        final Map<String, List<Edge>> starEdges = direction.equals(Direction.OUT) ? starGraph.starVertex.outEdges : starGraph.starVertex.inEdges;
        final boolean writeEdges = null != starEdges && edgeDirectionToSerialize != null
                && (edgeDirectionToSerialize == direction || edgeDirectionToSerialize == Direction.BOTH);
        if (writeEdges) {
            jsonGenerator.writeFieldName(direction == Direction.IN ? GraphSONTokens.IN_E : GraphSONTokens.OUT_E);
            GraphSONUtil.writeStartObject(directionalStarGraph, jsonGenerator, typeSerializer);
            final Set<String> keys = normalize ? new TreeSet<>(starEdges.keySet()) : starEdges.keySet();
            for (final String k : keys) {
                final List<Edge> edges = starEdges.get(k);
                jsonGenerator.writeFieldName(k);
                GraphSONUtil.writeStartArray(k, jsonGenerator, typeSerializer);

                final List<Edge> edgesToWrite = normalize ? sort(edges, Comparators.EDGE_COMPARATOR) : edges;
                for (final Edge edge : edgesToWrite) {
                    GraphSONUtil.writeStartObject(edge, jsonGenerator, typeSerializer);
                    GraphSONUtil.writeWithType(GraphSONTokens.ID, edge.id(), jsonGenerator, serializerProvider, typeSerializer);
                    GraphSONUtil.writeWithType(direction.equals(Direction.OUT) ? GraphSONTokens.IN : GraphSONTokens.OUT,
                            direction.equals(Direction.OUT) ? edge.inVertex().id() : edge.outVertex().id(),
                            jsonGenerator, serializerProvider, typeSerializer);

                    final Iterator<Property<Object>> edgeProperties = normalize ?
                            IteratorUtils.list(edge.properties(), Comparators.PROPERTY_COMPARATOR).iterator() : edge.properties();
                    if (edgeProperties.hasNext()) {
                        jsonGenerator.writeFieldName(GraphSONTokens.PROPERTIES);
                        GraphSONUtil.writeStartObject(edge, jsonGenerator, typeSerializer);
                        while (edgeProperties.hasNext()) {
                            final Property<Object> meta = edgeProperties.next();
                            GraphSONUtil.writeWithType(meta.key(), meta.value(), jsonGenerator, serializerProvider, typeSerializer);
                        }
                        GraphSONUtil.writeEndObject(edge, jsonGenerator, typeSerializer);
                    }
                    GraphSONUtil.writeEndObject(edge, jsonGenerator, typeSerializer);
                }
                GraphSONUtil.writeEndArray(k, jsonGenerator, typeSerializer);
            }
            GraphSONUtil.writeEndObject(directionalStarGraph, jsonGenerator, typeSerializer);
        }
    }
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/util/star/StarGraphGraphSONSerializerV3.java [113:158]:
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    private void writeEdges(final DirectionalStarGraph directionalStarGraph, final JsonGenerator jsonGenerator,
                            final SerializerProvider serializerProvider,
                            final TypeSerializer typeSerializer,
                            final Direction direction)  throws IOException, JsonProcessingException {
        // only write edges if there are some AND if the user requested them to be serialized AND if they match
        // the direction being serialized by the format
        final StarGraph starGraph = directionalStarGraph.getStarGraphToSerialize();
        final Direction edgeDirectionToSerialize = directionalStarGraph.getDirection();
        final Map<String, List<Edge>> starEdges = direction.equals(Direction.OUT) ? starGraph.starVertex.outEdges : starGraph.starVertex.inEdges;
        final boolean writeEdges = null != starEdges && edgeDirectionToSerialize != null
                && (edgeDirectionToSerialize == direction || edgeDirectionToSerialize == Direction.BOTH);
        if (writeEdges) {
            jsonGenerator.writeFieldName(direction == Direction.IN ? GraphSONTokens.IN_E : GraphSONTokens.OUT_E);
            GraphSONUtil.writeStartObject(directionalStarGraph, jsonGenerator, typeSerializer);
            final Set<String> keys = normalize ? new TreeSet<>(starEdges.keySet()) : starEdges.keySet();
            for (final String k : keys) {
                final List<Edge> edges = starEdges.get(k);
                jsonGenerator.writeFieldName(k);
                GraphSONUtil.writeStartArray(k, jsonGenerator, typeSerializer);

                final List<Edge> edgesToWrite = normalize ? sort(edges, Comparators.EDGE_COMPARATOR) : edges;
                for (final Edge edge : edgesToWrite) {
                    GraphSONUtil.writeStartObject(edge, jsonGenerator, typeSerializer);
                    GraphSONUtil.writeWithType(GraphSONTokens.ID, edge.id(), jsonGenerator, serializerProvider, typeSerializer);
                    GraphSONUtil.writeWithType(direction.equals(Direction.OUT) ? GraphSONTokens.IN : GraphSONTokens.OUT,
                            direction.equals(Direction.OUT) ? edge.inVertex().id() : edge.outVertex().id(),
                            jsonGenerator, serializerProvider, typeSerializer);

                    final Iterator<Property<Object>> edgeProperties = normalize ?
                            IteratorUtils.list(edge.properties(), Comparators.PROPERTY_COMPARATOR).iterator() : edge.properties();
                    if (edgeProperties.hasNext()) {
                        jsonGenerator.writeFieldName(GraphSONTokens.PROPERTIES);
                        GraphSONUtil.writeStartObject(edge, jsonGenerator, typeSerializer);
                        while (edgeProperties.hasNext()) {
                            final Property<Object> meta = edgeProperties.next();
                            GraphSONUtil.writeWithType(meta.key(), meta.value(), jsonGenerator, serializerProvider, typeSerializer);
                        }
                        GraphSONUtil.writeEndObject(edge, jsonGenerator, typeSerializer);
                    }
                    GraphSONUtil.writeEndObject(edge, jsonGenerator, typeSerializer);
                }
                GraphSONUtil.writeEndArray(k, jsonGenerator, typeSerializer);
            }
            GraphSONUtil.writeEndObject(directionalStarGraph, jsonGenerator, typeSerializer);
        }
    }
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/util/star/StarGraphGraphSONSerializerV2.java [113:158]:
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    private void writeEdges(final DirectionalStarGraph directionalStarGraph, final JsonGenerator jsonGenerator,
                            final SerializerProvider serializerProvider,
                            final TypeSerializer typeSerializer,
                            final Direction direction)  throws IOException, JsonProcessingException {
        // only write edges if there are some AND if the user requested them to be serialized AND if they match
        // the direction being serialized by the format
        final StarGraph starGraph = directionalStarGraph.getStarGraphToSerialize();
        final Direction edgeDirectionToSerialize = directionalStarGraph.getDirection();
        final Map<String, List<Edge>> starEdges = direction.equals(Direction.OUT) ? starGraph.starVertex.outEdges : starGraph.starVertex.inEdges;
        final boolean writeEdges = null != starEdges && edgeDirectionToSerialize != null
                && (edgeDirectionToSerialize == direction || edgeDirectionToSerialize == Direction.BOTH);
        if (writeEdges) {
            jsonGenerator.writeFieldName(direction == Direction.IN ? GraphSONTokens.IN_E : GraphSONTokens.OUT_E);
            GraphSONUtil.writeStartObject(directionalStarGraph, jsonGenerator, typeSerializer);
            final Set<String> keys = normalize ? new TreeSet<>(starEdges.keySet()) : starEdges.keySet();
            for (final String k : keys) {
                final List<Edge> edges = starEdges.get(k);
                jsonGenerator.writeFieldName(k);
                GraphSONUtil.writeStartArray(k, jsonGenerator, typeSerializer);

                final List<Edge> edgesToWrite = normalize ? sort(edges, Comparators.EDGE_COMPARATOR) : edges;
                for (final Edge edge : edgesToWrite) {
                    GraphSONUtil.writeStartObject(edge, jsonGenerator, typeSerializer);
                    GraphSONUtil.writeWithType(GraphSONTokens.ID, edge.id(), jsonGenerator, serializerProvider, typeSerializer);
                    GraphSONUtil.writeWithType(direction.equals(Direction.OUT) ? GraphSONTokens.IN : GraphSONTokens.OUT,
                            direction.equals(Direction.OUT) ? edge.inVertex().id() : edge.outVertex().id(),
                            jsonGenerator, serializerProvider, typeSerializer);

                    final Iterator<Property<Object>> edgeProperties = normalize ?
                            IteratorUtils.list(edge.properties(), Comparators.PROPERTY_COMPARATOR).iterator() : edge.properties();
                    if (edgeProperties.hasNext()) {
                        jsonGenerator.writeFieldName(GraphSONTokens.PROPERTIES);
                        GraphSONUtil.writeStartObject(edge, jsonGenerator, typeSerializer);
                        while (edgeProperties.hasNext()) {
                            final Property<Object> meta = edgeProperties.next();
                            GraphSONUtil.writeWithType(meta.key(), meta.value(), jsonGenerator, serializerProvider, typeSerializer);
                        }
                        GraphSONUtil.writeEndObject(edge, jsonGenerator, typeSerializer);
                    }
                    GraphSONUtil.writeEndObject(edge, jsonGenerator, typeSerializer);
                }
                GraphSONUtil.writeEndArray(k, jsonGenerator, typeSerializer);
            }
            GraphSONUtil.writeEndObject(directionalStarGraph, jsonGenerator, typeSerializer);
        }
    }
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