org.apache.lucene.document

## Class LatLonDocValuesField

- java.lang.Object
- - org.apache.lucene.document.Field
  - - org.apache.lucene.document.LatLonDocValuesField

- All Implemented Interfaces:
    IndexableField

      public class LatLonDocValuesField
      extends Field

  An per-document location field.

  Sorting by distance is efficient. Multiple values for the same field in one document is allowed.

  This field defines static factory methods for common operations:

  - `newDistanceSort()` for ordering documents by distance from a specified location.

  If you also need query operations, you should add a separate `LatLonPoint` instance. If you also need to store the value, you should add a separate `StoredField` instance.

  WARNING: Values are indexed with some loss of precision from the original `double` values (4.190951585769653E-8 for the latitude component and 8.381903171539307E-8 for longitude).

  See Also:
    `LatLonPoint`

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.document.Field

      `Field.Store`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static FieldType` | `TYPE` Type for a LatLonDocValuesField

    - ### Fields inherited from class org.apache.lucene.document.Field

      `fieldsData, name, tokenStream, type`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `LatLonDocValuesField(String name, double latitude, double longitude)` Creates a new LatLonDocValuesField with the specified latitude and longitude

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static SortField` | `newDistanceSort(String field, double latitude, double longitude)` Creates a SortField for sorting by distance from a location.
    `static Query` | `newSlowBoxQuery(String field, double minLatitude, double maxLatitude, double minLongitude, double maxLongitude)` Create a query for matching a bounding box using doc values.
    `static Query` | `newSlowDistanceQuery(String field, double latitude, double longitude, double radiusMeters)` Create a query for matching points within the specified distance of the supplied location.
    `void` | `setLocationValue(double latitude, double longitude)` Change the values of this field
    `String` | `toString()` Prints a Field for human consumption.

    - ### Methods inherited from class org.apache.lucene.document.Field

      `binaryValue, fieldType, getCharSequenceValue, name, numericValue, readerValue, setBytesValue, setBytesValue, setByteValue, setDoubleValue, setFloatValue, setIntValue, setLongValue, setReaderValue, setShortValue, setStringValue, setTokenStream, stringValue, tokenStream, tokenStreamValue`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### TYPE

          public static final FieldType TYPE

      Type for a LatLonDocValuesField

      Each value stores a 64-bit long where the upper 32 bits are the encoded latitude, and the lower 32 bits are the encoded longitude.

      See Also:
        `GeoEncodingUtils.decodeLatitude(int)`, `GeoEncodingUtils.decodeLongitude(int)`

  - ### Constructor Detail

    - #### LatLonDocValuesField

          public LatLonDocValuesField(String name,
                                      double latitude,
                                      double longitude)

      Creates a new LatLonDocValuesField with the specified latitude and longitude
      Parameters:
        `name` - field name
        `latitude` - latitude value: must be within standard +/-90 coordinate bounds.
        `longitude` - longitude value: must be within standard +/-180 coordinate bounds.
      Throws:
        `IllegalArgumentException` - if the field name is null or latitude or longitude are out of bounds

  - ### Method Detail

    - #### setLocationValue

          public void setLocationValue(double latitude,
                                       double longitude)

      Change the values of this field
      Parameters:
        `latitude` - latitude value: must be within standard +/-90 coordinate bounds.
        `longitude` - longitude value: must be within standard +/-180 coordinate bounds.
      Throws:
        `IllegalArgumentException` - if latitude or longitude are out of bounds

    - #### toString

          public String toString()

      Description copied from class: `Field`
      Prints a Field for human consumption.
      Overrides:
        `toString` in class `Field`

    - #### newDistanceSort

          public static SortField newDistanceSort(String field,
                                                  double latitude,
                                                  double longitude)

      Creates a SortField for sorting by distance from a location.

      This sort orders documents by ascending distance from the location. The value returned in `FieldDoc` for the hits contains a Double instance with the distance in meters.

      If a document is missing the field, then by default it is treated as having `Double.POSITIVE_INFINITY` distance (missing values sort last).

      If a document contains multiple values for the field, the closest distance to the location is used.

      Parameters:
        `field` - field name. must not be null.
        `latitude` - latitude at the center: must be within standard +/-90 coordinate bounds.
        `longitude` - longitude at the center: must be within standard +/-180 coordinate bounds.
      Returns:
        SortField ordering documents by distance
      Throws:
        `IllegalArgumentException` - if `field` is null or location has invalid coordinates.

    - #### newSlowBoxQuery

          public static Query newSlowBoxQuery(String field,
                                              double minLatitude,
                                              double maxLatitude,
                                              double minLongitude,
                                              double maxLongitude)

      Create a query for matching a bounding box using doc values. This query is usually slow as it does not use an index structure and needs to verify documents one-by-one in order to know whether they match. It is best used wrapped in an `IndexOrDocValuesQuery` alongside a `LatLonPoint.newBoxQuery(java.lang.String, double, double, double, double)`.

    - #### newSlowDistanceQuery

          public static Query newSlowDistanceQuery(String field,
                                                   double latitude,
                                                   double longitude,
                                                   double radiusMeters)

      Create a query for matching points within the specified distance of the supplied location. This query is usually slow as it does not use an index structure and needs to verify documents one-by-one in order to know whether they match. It is best used wrapped in an `IndexOrDocValuesQuery` alongside a `LatLonPoint.newDistanceQuery(java.lang.String, double, double, double)`.
      Parameters:
        `field` - field name. must not be null.
        `latitude` - latitude at the center: must be within standard +/-90 coordinate bounds.
        `longitude` - longitude at the center: must be within standard +/-180 coordinate bounds.
        `radiusMeters` - maximum distance from the center in meters: must be non-negative and finite.
      Returns:
        query matching points within this distance
      Throws:
        `IllegalArgumentException` - if `field` is null, location has invalid coordinates, or radius is invalid.

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