Package org.springframework.data.mongodb.core.query

Class NearQuery

java.lang.Object
org.springframework.data.mongodb.core.query.NearQuery
All Implemented Interfaces:
ReadConcernAware, ReadPreferenceAware
public final class NearQuery extends Object implements ReadConcernAware, ReadPreferenceAware
Builder class to build near-queries.
MongoDB $geoNear operator allows usage of a GeoJSON Point or legacy coordinate pair. Though syntactically different, there's no difference between near: [-73.99171, 40.738868] and near: { type: "Point", coordinates: [-73.99171, 40.738868] } for the MongoDB server

Please note that there is a huge difference in the distance calculation. Using the legacy format (for near) operates upon Radians on an Earth like sphere, whereas the GeoJSON format uses Meters. The actual type within the document is of no concern at this point.
To avoid a serious headache make sure to set the Metric to the desired unit of measure which ensures the distance to be calculated correctly.

In other words:
Assume you've got 5 Documents like the ones below 
     
 {
     "_id" : ObjectId("5c10f3735d38908db52796a5"),
     "name" : "Penn Station",
     "location" : { "type" : "Point", "coordinates" : [  -73.99408, 40.75057 ] }
 }
 {
     "_id" : ObjectId("5c10f3735d38908db52796a6"),
     "name" : "10gen Office",
     "location" : { "type" : "Point", "coordinates" : [ -73.99171, 40.738868 ] }
 }
 {
     "_id" : ObjectId("5c10f3735d38908db52796a9"),
     "name" : "City Bakery ",
     "location" : { "type" : "Point", "coordinates" : [ -73.992491, 40.738673 ] }
 }
 {
     "_id" : ObjectId("5c10f3735d38908db52796aa"),
     "name" : "Splash Bar",
     "location" : { "type" : "Point", "coordinates" : [ -73.992491, 40.738673 ] }
 }
 {
     "_id" : ObjectId("5c10f3735d38908db52796ab"),
     "name" : "Momofuku Milk Bar",
     "location" : { "type" : "Point", "coordinates" : [ -73.985839, 40.731698 ] }
 }
Fetching all Documents within a 400 Meter radius from [-73.99171, 40.738868] would look like this using GeoJSON: 
     
 {
     $geoNear: {
         maxDistance: 400,
         num: 10,
         near: { type: "Point", coordinates: [-73.99171, 40.738868] },
         spherical:true,
         key: "location",
         distanceField: "distance"
     }
 }
resulting in the following 3 Documents. 
     
 {
     "_id" : ObjectId("5c10f3735d38908db52796a6"),
     "name" : "10gen Office",
     "location" : { "type" : "Point", "coordinates" : [ -73.99171, 40.738868 ] }
     "distance" : 0.0 // Meters
 }
 {
     "_id" : ObjectId("5c10f3735d38908db52796a9"),
     "name" : "City Bakery ",
     "location" : { "type" : "Point", "coordinates" : [ -73.992491, 40.738673 ] }
     "distance" : 69.3582262492474 // Meters
 }
 {
     "_id" : ObjectId("5c10f3735d38908db52796aa"),
     "name" : "Splash Bar",
     "location" : { "type" : "Point", "coordinates" : [ -73.992491, 40.738673 ] }
     "distance" : 69.3582262492474 // Meters
 }
Using legacy coordinate pairs one operates upon radians as discussed before. Assume we use Metrics.KILOMETERS when constructing the geoNear command. The Metric will make sure the distance multiplier is set correctly, so the command is rendered like 
     
 {
     $geoNear: {
         maxDistance: 0.0000627142377, // 400 Meters
         distanceMultiplier: 6378.137,
         num: 10,
         near: [-73.99171, 40.738868],
         spherical:true,
         key: "location",
         distanceField: "distance"
     }
 }
Please note the calculated distance now uses Kilometers instead of Meters as unit of measure, so we need to take it times 1000 to match up to Meters as in the GeoJSON variant.
Still as we've been requesting the Distance in Metrics.KILOMETERS the Distance.getValue() reflects exactly this. 
     
 {
     "_id" : ObjectId("5c10f3735d38908db52796a6"),
     "name" : "10gen Office",
     "location" : { "type" : "Point", "coordinates" : [ -73.99171, 40.738868 ] }
     "distance" : 0.0 // Kilometers
 }
 {
     "_id" : ObjectId("5c10f3735d38908db52796a9"),
     "name" : "City Bakery ",
     "location" : { "type" : "Point", "coordinates" : [ -73.992491, 40.738673 ] }
     "distance" : 0.0693586286032982 // Kilometers
 }
 {
     "_id" : ObjectId("5c10f3735d38908db52796aa"),
     "name" : "Splash Bar",
     "location" : { "type" : "Point", "coordinates" : [ -73.992491, 40.738673 ] }
     "distance" : 0.0693586286032982 // Kilometers
 }
Author:
Oliver Gierke, Thomas Darimont, Christoph Strobl, Mark Paluch

  • Method Details

    • near

      public static NearQuery near(double x, double y)
      Creates a new NearQuery starting near the given coordinates.
      Parameters:
      x -
      y -
      Returns:

    • near

      public static NearQuery near(double x, double y, Metric metric)
      Creates a new NearQuery starting at the given coordinates using the given Metric to adapt given values to further configuration. E.g. setting a maxDistance(double) will be interpreted as a value of the initially set Metric.
      Parameters:
      x -
      y -
      metric - must not be null.
      Returns:

    • near

      public static NearQuery near(Point point)
      Creates a new NearQuery starting at the given Point.
      NOTE: There is a difference in using Point versus GeoJsonPoint. Point values are rendered as coordinate pairs in the legacy format and operate upon radians, whereas the GeoJsonPoint uses according to its specification meters as unit of measure. This may lead to different results when using a neutral Metric.
      Parameters:
      point - must not be null.
      Returns:
      new instance of NearQuery.

    • near

      public static NearQuery near(Point point, Metric metric)
      Creates a NearQuery starting near the given Point using the given Metric to adapt given values to further configuration. E.g. setting a maxDistance(double) will be interpreted as a value of the initially set Metric.
      NOTE: There is a difference in using Point versus GeoJsonPoint. Point values are rendered as coordinate pairs in the legacy format and operate upon radians, whereas the GeoJsonPoint uses according to its specification meters as unit of measure. This may lead to different results when using a neutral Metric.
      Parameters:
      point - must not be null.
      metric - must not be null.
      Returns:
      new instance of NearQuery.

    • getMetric

      public Metric getMetric()
      Returns the Metric underlying the actual query. If no metric was set explicitly Metrics.NEUTRAL will be returned.
      Returns:
      will never be null.

    • limit

      public NearQuery limit(long limit)
      Configures the maximum number of results to return.
      Parameters:
      limit -
      Returns:
      Since:
      2.2

    • skip

      public NearQuery skip(long skip)
      Configures the number of results to skip.
      Parameters:
      skip -
      Returns:

    • with

      public NearQuery with(Pageable pageable)
      Configures the Pageable to use.
      Parameters:
      pageable - must not be null
      Returns:

    • maxDistance

      public NearQuery maxDistance(double maxDistance)
      Sets the max distance results shall have from the configured origin. If a Metric was set before the given value will be interpreted as being a value in that metric. E.g. 
       NearQuery query = near(10.0, 20.0, Metrics.KILOMETERS).maxDistance(150);
      Will set the maximum distance to 150 kilometers.
      Parameters:
      maxDistance -
      Returns:

    • maxDistance

      public NearQuery maxDistance(double maxDistance, Metric metric)
      Sets the maximum distance supplied in a given metric. Will normalize the distance but not reconfigure the query's result Metric if one was configured before.
      Parameters:
      maxDistance -
      metric - must not be null.
      Returns:

    • maxDistance

      public NearQuery maxDistance(Distance distance)
      Sets the maximum distance to the given Distance. Will set the returned Metric to be the one of the given Distance if Metric was Metrics.NEUTRAL before.
      Parameters:
      distance - must not be null.
      Returns:

    • minDistance

      public NearQuery minDistance(double minDistance)
      Sets the minimum distance results shall have from the configured origin. If a Metric was set before the given value will be interpreted as being a value in that metric. E.g. 
       NearQuery query = near(10.0, 20.0, Metrics.KILOMETERS).minDistance(150);
      Will set the minimum distance to 150 kilometers.
      Parameters:
      minDistance -
      Returns:
      Since:
      1.7

    • minDistance

      public NearQuery minDistance(double minDistance, Metric metric)
      Sets the minimum distance supplied in a given metric. Will normalize the distance but not reconfigure the query's result Metric if one was configured before.
      Parameters:
      minDistance -
      metric - must not be null.
      Returns:
      Since:
      1.7

    • minDistance

      public NearQuery minDistance(Distance distance)
      Sets the minimum distance to the given Distance. Will set the returned Metric to be the one of the given Distance if no Metric was set before.
      Parameters:
      distance - must not be null.
      Returns:
      Since:
      1.7

    • getMaxDistance

      @Nullable public Distance getMaxDistance()
      Returns the maximum Distance.
      Returns:

    • getMinDistance

      @Nullable public Distance getMinDistance()
      Returns the maximum Distance.
      Returns:
      Since:
      1.7

    • distanceMultiplier

      public NearQuery distanceMultiplier(double distanceMultiplier)
      Configures a CustomMetric with the given multiplier.
      Parameters:
      distanceMultiplier -
      Returns:

    • spherical

      public NearQuery spherical(boolean spherical)
      Configures whether to return spherical values for the actual distance.
      Parameters:
      spherical -
      Returns:

    • isSpherical

      public boolean isSpherical()
      Returns whether spharical values will be returned.
      Returns:

    • inKilometers

      public NearQuery inKilometers()
      Will cause the results' distances being returned in kilometers. Sets distanceMultiplier(double) and spherical(boolean) accordingly.
      Returns:

    • inMiles

      public NearQuery inMiles()
      Will cause the results' distances being returned in miles. Sets distanceMultiplier(double) and spherical(boolean) accordingly.
      Returns:

    • in

      public NearQuery in(@Nullable Metric metric)
      Will cause the results' distances being returned in the given metric. Sets distanceMultiplier(double) accordingly as well as spherical(boolean) if the given Metric is not Metrics.NEUTRAL.
      Parameters:
      metric - the metric the results shall be returned in. Uses Metrics.NEUTRAL if null is passed.
      Returns:

    • query

      public NearQuery query(Query query)
      Adds an actual query to the NearQuery to restrict the objects considered for the actual near operation.
      Parameters:
      query - must not be null.
      Returns:

    • getSkip

      @Nullable public Long getSkip()
      Returns:
      the number of elements to skip.

    • getCollation

      @Nullable public Collation getCollation()
      Get the Collation to use along with the query(Query).
      Returns:
      the Collation if set. null otherwise.
      Since:
      2.2

    • withReadConcern

      public NearQuery withReadConcern(com.mongodb.ReadConcern readConcern)
      Configures the query to use the given ReadConcern unless the underlying query(Query) specifies another one.
      Parameters:
      readConcern - must not be null.
      Returns:
      this.
      Since:
      4.1

    • withReadPreference

      public NearQuery withReadPreference(com.mongodb.ReadPreference readPreference)
      Configures the query to use the given ReadPreference unless the underlying query(Query) specifies another one.
      Parameters:
      readPreference - must not be null.
      Returns:
      this.
      Since:
      4.1

    • getReadConcern

      @Nullable public com.mongodb.ReadConcern getReadConcern()
      Get the ReadConcern to use. Will return the underlying queries ReadConcern if present or the one defined on the readConcern itself.
      Specified by:
      getReadConcern in interface ReadConcernAware
      Returns:
      can be null if none set.
      Since:
      4.1
      See Also:

    • getReadPreference

      @Nullable public com.mongodb.ReadPreference getReadPreference()
      Get the ReadPreference to use. Will return the underlying queries ReadPreference if present or the one defined on the readPreference itself.
      Specified by:
      getReadPreference in interface ReadPreferenceAware
      Returns:
      can be null if none set.
      Since:
      4.1
      See Also:

    • toDocument

      public org.bson.Document toDocument()
      Returns the Document built by the NearQuery.
      Returns: