com.datastax.driver.dse.graph.GraphSON2GremlinDriverModule Maven / Gradle / Ivy

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A driver for DataStax Enterprise (DSE) and Apache Cassandra 1.2+ clusters that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol, supporting DSE-specific features such as geospatial types, DSE Graph and DSE authentication.
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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.dse.graph;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

class GraphSON2GremlinDriverModule extends GraphSON2JacksonModule {

  GraphSON2GremlinDriverModule() {
    super("graph-graphson2gremlin");
    addSerializer(Integer.class, new IntegerGraphSONSerializer());
    addSerializer(Double.class, new DoubleGraphSONSerializer());

    addDeserializer(Vertex.class, new VertexGraphSON2Deserializer());
    addDeserializer(VertexProperty.class, new VertexPropertyGraphSON2Deserializer());
    addDeserializer(Property.class, new PropertyGraphSON2Deserializer());
    addDeserializer(Edge.class, new EdgeGraphSON2Deserializer());
    addDeserializer(Path.class, new PathGraphSON2Deserializer());
  }

  @Override
  public Map, String> getTypeDefinitions() {
    // Override the TinkerPop classes' types.
    final ImmutableMap.Builder, String> builder = ImmutableMap.builder();
    builder.put(Integer.class, "Int32");
    builder.put(Long.class, "Int64");
    builder.put(Double.class, "Double");
    builder.put(Float.class, "Float");

    builder.put(Vertex.class, "Vertex");
    builder.put(VertexProperty.class, "VertexProperty");
    builder.put(Property.class, "Property");
    builder.put(Edge.class, "Edge");
    builder.put(Path.class, "Path");
    builder.put(List.class, "Tree");

    return builder.build();
  }

  @Override
  public String getTypeNamespace() {
    // Override the classes from the TinkerPop domain.
    return "g";
  }

  static final class IntegerGraphSONSerializer extends StdScalarSerializer {
    IntegerGraphSONSerializer() {
      super(Integer.class);
    }

    @Override
    public void serialize(
        final Integer integer,
        final JsonGenerator jsonGenerator,
        final SerializerProvider serializerProvider)
        throws IOException {
      jsonGenerator.writeNumber(((Integer) integer).intValue());
    }
  }

  static final class DoubleGraphSONSerializer extends StdScalarSerializer {
    DoubleGraphSONSerializer() {
      super(Double.class);
    }

    @Override
    public void serialize(
        final Double doubleValue,
        final JsonGenerator jsonGenerator,
        final SerializerProvider serializerProvider)
        throws IOException {
      jsonGenerator.writeNumber(doubleValue);
    }
  }

  static final class VertexGraphSON2Deserializer extends StdDeserializer {

    VertexGraphSON2Deserializer() {
      super(Vertex.class);
    }

    @Override
    public Vertex deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
        throws IOException, JsonProcessingException {
      final DefaultVertex v = new DefaultVertex();
      while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
        if (jsonParser.getCurrentName().equals(GraphSONTokens.ID)) {
          jsonParser.nextToken();
          v.id = new ObjectGraphNode(deserializationContext.readValue(jsonParser, Object.class));
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.LABEL)) {
          jsonParser.nextToken();
          v.label = jsonParser.getText();
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.PROPERTIES)) {
          jsonParser.nextToken();
          ImmutableMultimap.Builder builder = ImmutableMultimap.builder();
          while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
            jsonParser.nextToken();
            while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
              DefaultVertexProperty vp =
                  (DefaultVertexProperty)
                      deserializationContext.readValue(jsonParser, VertexProperty.class);
              vp.parent = v;
              builder.put(vp.getName(), new ObjectGraphNode(vp));
            }
          }
          v.properties = builder.build();
        }
      }
      return v;
    }

    @Override
    public boolean isCachable() {
      return true;
    }
  }

  static final class VertexPropertyGraphSON2Deserializer extends StdDeserializer {

    VertexPropertyGraphSON2Deserializer() {
      super(VertexProperty.class);
    }

    @Override
    public VertexProperty deserialize(
        JsonParser jsonParser, DeserializationContext deserializationContext)
        throws IOException, JsonProcessingException {
      final DefaultVertexProperty vp = new DefaultVertexProperty();

      while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
        if (jsonParser.getCurrentName().equals(GraphSONTokens.ID)) {
          jsonParser.nextToken();
          vp.id = new ObjectGraphNode(deserializationContext.readValue(jsonParser, Object.class));
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.LABEL)) {
          jsonParser.nextToken();
          vp.label = jsonParser.getText();
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.VALUE)) {
          jsonParser.nextToken();
          vp.value =
              new ObjectGraphNode(deserializationContext.readValue(jsonParser, Object.class));
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.PROPERTIES)) {
          jsonParser.nextToken();
          ImmutableMultimap.Builder builder = ImmutableMultimap.builder();
          while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
            final String key = jsonParser.getCurrentName();
            jsonParser.nextToken();
            final Object val = deserializationContext.readValue(jsonParser, Object.class);
            DefaultProperty prop = new DefaultProperty();
            prop.name = key;
            prop.value = new ObjectGraphNode(val);
            prop.parent = vp;
            builder.put(prop.name, new ObjectGraphNode(prop));
          }
          vp.properties = builder.build();
        }
      }
      return vp;
    }

    @Override
    public boolean isCachable() {
      return true;
    }
  }

  static final class EdgeGraphSON2Deserializer extends StdDeserializer {

    EdgeGraphSON2Deserializer() {
      super(Edge.class);
    }

    @Override
    public Edge deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
        throws IOException, JsonProcessingException {
      final DefaultEdge e = new DefaultEdge();
      while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
        if (jsonParser.getCurrentName().equals(GraphSONTokens.ID)) {
          jsonParser.nextToken();
          e.id = new ObjectGraphNode(deserializationContext.readValue(jsonParser, Object.class));
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.LABEL)) {
          jsonParser.nextToken();
          e.label = jsonParser.getText();
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.OUT)) {
          jsonParser.nextToken();
          e.outV = new ObjectGraphNode(deserializationContext.readValue(jsonParser, Object.class));
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.OUT_LABEL)) {
          jsonParser.nextToken();
          e.outVLabel = jsonParser.getText();
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.IN)) {
          jsonParser.nextToken();
          e.inV = new ObjectGraphNode(deserializationContext.readValue(jsonParser, Object.class));
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.IN_LABEL)) {
          jsonParser.nextToken();
          e.inVLabel = jsonParser.getText();
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.PROPERTIES)) {
          jsonParser.nextToken();
          ImmutableMultimap.Builder builder = ImmutableMultimap.builder();
          while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
            jsonParser.nextToken();
            DefaultProperty prop =
                (DefaultProperty) deserializationContext.readValue(jsonParser, Property.class);
            prop.parent = e;
            builder.put(prop.name, new ObjectGraphNode(prop));
          }
          e.properties = builder.build();
        }
      }
      return e;
    }

    @Override
    public boolean isCachable() {
      return true;
    }
  }

  static final class PropertyGraphSON2Deserializer extends StdDeserializer {
    PropertyGraphSON2Deserializer() {
      super(Property.class);
    }

    @Override
    public Property deserialize(
        JsonParser jsonParser, DeserializationContext deserializationContext)
        throws IOException, JsonProcessingException {
      final DefaultProperty prop = new DefaultProperty();
      while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
        if (jsonParser.getCurrentName().equals(GraphSONTokens.KEY)) {
          jsonParser.nextToken();
          prop.name = jsonParser.getText();
        } else if (jsonParser.getCurrentName().equals(GraphSONTokens.VALUE)) {
          jsonParser.nextToken();
          prop.value =
              new ObjectGraphNode(deserializationContext.readValue(jsonParser, Object.class));
        }
      }
      return prop;
    }

    @Override
    public boolean isCachable() {
      return true;
    }
  }

  static final class PathGraphSON2Deserializer extends StdDeserializer {
    private static final JavaType setType =
        TypeFactory.defaultInstance().constructCollectionType(HashSet.class, String.class);

    PathGraphSON2Deserializer() {
      super(Path.class);
    }

    @Override
    public Path deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
        throws IOException, JsonProcessingException {
      final JsonNode n = jsonParser.readValueAsTree();
      final DefaultPath p = new DefaultPath();

      final ArrayNode objects = (ArrayNode) n.get(GraphSONTokens.OBJECTS);
      final ArrayNode labels = (ArrayNode) n.get(GraphSONTokens.LABELS);

      final List objectsList = new ArrayList();
      final List> labelsList = new ArrayList>();

      for (int i = 0; i < objects.size(); i++) {
        final JsonParser po = objects.get(i).traverse();
        po.nextToken();
        final JsonParser pl = labels.get(i).traverse();
        pl.nextToken();

        objectsList.add(new ObjectGraphNode(deserializationContext.readValue(po, Object.class)));
        labelsList.add((Set) deserializationContext.readValue(pl, setType));
      }
      p.objects = objectsList;
      p.labels = labelsList;

      return p;
    }

    @Override
    public boolean isCachable() {
      return true;
    }
  }
}