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• Geometry.java

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com.datastax.driver.dse.geometry.Geometry Maven / Gradle / Ivy

/*
 * 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.geometry;

import static com.google.common.base.Preconditions.checkNotNull;

import com.datastax.driver.core.exceptions.InvalidTypeException;
import com.esri.core.geometry.GeometryException;
import com.esri.core.geometry.SpatialReference;
import com.esri.core.geometry.ogc.OGCGeometry;
import com.esri.core.geometry.ogc.OGCLineString;
import com.google.common.collect.ImmutableList;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.nio.ByteBuffer;

/**
 * The driver-side representation for a DSE geospatial type.
 *
 * 
{@link com.datastax.driver.dse.DseCluster.Builder} registers {@link
 * com.datastax.driver.dse.geometry.codecs codecs} for those types, so that they can be used
 * transparently in queries:
 *
 * 
 *     Row row = dseSession.execute("SELECT coords FROM points_of_interest WHERE name = 'Eiffel Tower'").one();
 *     Point coords = row.get("coords", Point.class);
 *
 *     dseSession.execute("INSERT INTO points_of_interest (name, coords) VALUES (?, ?)",
 *             "Washington Monument", new Point(38.8895, 77.0352));
 * 
 */
public abstract class Geometry implements Serializable {

  private static final long serialVersionUID = -3131471128157336656L;

  /**
   * Default spatial reference for Well Known Text / Well Known Binary.
   *
   * 
4326 is the EPSG identifier of the World Geodetic System (WGS) in
   * its later revision, WGS 84.
   */
  static final SpatialReference SPATIAL_REFERENCE_4326 = SpatialReference.create(4326);

  static  T fromOgcWellKnownText(String source, Class klass) {
    OGCGeometry geometry;
    try {
      geometry = OGCGeometry.fromText(source);
    } catch (IllegalArgumentException e) {
      throw new InvalidTypeException(e.getMessage());
    }
    validateType(geometry, klass);
    return klass.cast(geometry);
  }

  static  T fromOgcWellKnownBinary(ByteBuffer source, Class klass) {
    OGCGeometry geometry;
    try {
      geometry = OGCGeometry.fromBinary(source);
    } catch (IllegalArgumentException e) {
      throw new InvalidTypeException(e.getMessage());
    }
    validateType(geometry, klass);
    return klass.cast(geometry);
  }

  static  T fromOgcGeoJson(String source, Class klass) {
    OGCGeometry geometry;
    try {
      geometry = OGCGeometry.fromGeoJson(source);
    } catch (Exception e) {
      throw new InvalidTypeException(e.getMessage());
    }
    validateType(geometry, klass);
    return klass.cast(geometry);
  }

  private static void validateType(OGCGeometry geometry, Class klass) {
    if (!geometry.getClass().equals(klass)) {
      throw new InvalidTypeException(
          String.format(
              "%s is not of type %s", geometry.getClass().getSimpleName(), klass.getSimpleName()));
    }
  }

  private final OGCGeometry ogcGeometry;

  Geometry(OGCGeometry ogcGeometry) {
    this.ogcGeometry = ogcGeometry;
    checkNotNull(ogcGeometry);
    validateOgcGeometry(ogcGeometry);
  }

  private static void validateOgcGeometry(OGCGeometry geometry) {
    try {
      if (geometry.is3D()) {
        throw new InvalidTypeException(String.format("'%s' is not 2D", geometry.asText()));
      }
      if (!geometry.isSimple()) {
        throw new InvalidTypeException(
            String.format(
                "'%s' is not simple. Points and edges cannot self-intersect.", geometry.asText()));
      }
    } catch (GeometryException e) {
      throw new InvalidTypeException("Invalid geometry", e);
    }
  }

  static ImmutableList getPoints(OGCLineString lineString) {
    ImmutableList.Builder builder = ImmutableList.builder();
    for (int i = 0; i < lineString.numPoints(); i++) {
      builder.add(new Point(lineString.pointN(i)));
    }
    return builder.build();
  }

  /**
   * Returns the {@link OGCGeometry} object that this object maps to.
   *
   * @return an {@link OGCGeometry} object.
   */
  OGCGeometry getOgcGeometry() {
    return ogcGeometry;
  }

  com.esri.core.geometry.Geometry getEsriGeometry() {
    return ogcGeometry.getEsriGeometry();
  }

  /**
   * Returns a Well-known Text (WKT)
   * representation of this geospatial type.
   *
   * @return a Well-known Text representation of this object.
   */
  public String asWellKnownText() {
    return ogcGeometry.asText();
  }

  /**
   * Returns a Well-known
   * Binary (WKB) representation of this geospatial type.
   *
   * 
Note that, due to DSE implementation details, the resulting byte buffer always uses
   * little-endian order, regardless of the platform's native order.
   *
   * @return a Well-known Binary representation of this object.
   */
  public ByteBuffer asWellKnownBinary() {
    return WkbUtil.asLittleEndianBinary(ogcGeometry);
  }

  /**
   * Returns a JSON representation of this geospatial type.
   *
   * @return a JSON representation of this object.
   */
  public String asGeoJson() {
    return ogcGeometry.asGeoJson();
  }

  /**
   * Tests whether this geospatial type instance contains another instance.
   *
   * @param other the other instance.
   * @return whether {@code this} contains {@code other}.
   */
  public boolean contains(Geometry other) {
    checkNotNull(other);
    return getOgcGeometry().contains(other.getOgcGeometry());
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    Geometry that = (Geometry) o;
    return this.getOgcGeometry().equals(that.getOgcGeometry());
  }

  @Override
  public int hashCode() {
    // OGCGeometry subclasses do not overwrite Object.hashCode()
    // while com.esri.core.geometry.Geometry subclasses usually do,
    // so use these instead; this is consistent with equals
    // because OGCGeometry.equals() actually compare between
    // com.esri.core.geometry.Geometry objects
    return getEsriGeometry().hashCode();
  }

  // Should never be called since we serialize a proxy (see subclasses)
  private void readObject(ObjectInputStream stream) throws InvalidObjectException {
    throw new InvalidObjectException("Proxy required");
  }

  @Override
  public String toString() {
    return asWellKnownText();
  }
}