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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.datastax.driver.dse.geometry.Distance;
import com.datastax.driver.dse.geometry.Geometry;
import com.datastax.driver.dse.geometry.LineString;
import com.datastax.driver.dse.geometry.Point;
import com.datastax.driver.dse.geometry.Polygon;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * A Jackson Module to use for TinkerPop serialization/deserialization. It extends {@link
 * com.datastax.driver.dse.graph.GraphSON2JacksonModule} because of the specific typing format used
 * in GraphSON.
 */
class GraphSON2DseGraphDriverModule extends GraphSON2JacksonModule {

  GraphSON2DseGraphDriverModule() {
    super("graph-graphson2dsegraph");
    addSerializer(LineString.class, new LineStringGeometrySerializer());
    addSerializer(Distance.class, new DistanceGeometrySerializer());
    addSerializer(Point.class, new PointGeometrySerializer());
    addSerializer(Polygon.class, new PolygonGeometrySerializer());

    addDeserializer(LineString.class, new LineStringGeometryDeserializer());
    addDeserializer(Point.class, new PointGeometryDeserializer());
    addDeserializer(Polygon.class, new PolygonGeometryDeserializer());
    addDeserializer(Distance.class, new DistanceGeometryDeserializer());
  }

  @Override
  public Map, String> getTypeDefinitions() {
    Map, String> definitions = new HashMap, String>();
    definitions.put(LineString.class, "LineString");
    definitions.put(Point.class, "Point");
    definitions.put(Polygon.class, "Polygon");
    definitions.put(Distance.class, "Distance");
    definitions.put(byte[].class, "Blob");
    return definitions;
  }

  @Override
  public String getTypeNamespace() {
    return "dse";
  }

  abstract static class AbstractGeometryJacksonDeserializer
      extends StdDeserializer {
    protected AbstractGeometryJacksonDeserializer(final Class clazz) {
      super(clazz);
    }

    protected abstract T parse(final String val);

    @Override
    public T deserialize(
        final JsonParser jsonParser, final DeserializationContext deserializationContext)
        throws IOException {
      return parse(jsonParser.getText());
    }
  }

  abstract static class AbstractGeometryJacksonSerializer
      extends StdScalarSerializer {

    protected AbstractGeometryJacksonSerializer(final Class clazz) {
      super(clazz);
    }

    @Override
    public void serialize(
        final T value, final JsonGenerator gen, final SerializerProvider serializerProvider)
        throws IOException {
      gen.writeString(value.asWellKnownText());
    }
  }

  static final class LineStringGeometrySerializer
      extends AbstractGeometryJacksonSerializer {
    LineStringGeometrySerializer() {
      super(LineString.class);
    }
  }

  static final class LineStringGeometryDeserializer
      extends AbstractGeometryJacksonDeserializer {
    LineStringGeometryDeserializer() {
      super(LineString.class);
    }

    @Override
    public LineString parse(final String val) {
      return LineString.fromWellKnownText(val);
    }
  }

  static final class PolygonGeometrySerializer extends AbstractGeometryJacksonSerializer {
    PolygonGeometrySerializer() {
      super(Polygon.class);
    }
  }

  static final class PolygonGeometryDeserializer
      extends AbstractGeometryJacksonDeserializer {
    PolygonGeometryDeserializer() {
      super(Polygon.class);
    }

    @Override
    public Polygon parse(final String val) {
      return Polygon.fromWellKnownText(val);
    }
  }

  static final class PointGeometrySerializer extends AbstractGeometryJacksonSerializer {
    PointGeometrySerializer() {
      super(Point.class);
    }
  }

  static final class PointGeometryDeserializer extends AbstractGeometryJacksonDeserializer {
    PointGeometryDeserializer() {
      super(Point.class);
    }

    @Override
    public Point parse(final String val) {
      return Point.fromWellKnownText(val);
    }
  }

  static final class DistanceGeometrySerializer
      extends AbstractGeometryJacksonSerializer {
    DistanceGeometrySerializer() {
      super(Distance.class);
    }
  }

  static final class DistanceGeometryDeserializer
      extends AbstractGeometryJacksonDeserializer {
    DistanceGeometryDeserializer() {
      super(Distance.class);
    }

    @Override
    public Distance parse(final String val) {
      return Distance.fromWellKnownText(val);
    }
  }
}