Package org.apache.lucene.document

# Class FloatPoint

java.lang.Object
org.apache.lucene.document.Field
org.apache.lucene.document.FloatPoint

All Implemented Interfaces:
  `IndexableField`

public final class FloatPoint extends Field
An indexed `float` field for fast range filters. If you also need to store the value, you should add a separate `StoredField` instance.

Finding all documents within an N-dimensional at search time is efficient. Multiple values for the same field in one document is allowed.

This field defines static factory methods for creating common queries:

- `newExactQuery(String, float)` for matching an exact 1D point.
- `newSetQuery(String, float...)` for matching a set of 1D values.
- `newRangeQuery(String, float, float)` for matching a 1D range.
- `newRangeQuery(String, float[], float[])` for matching points/ranges in n-dimensional space.

See Also:
  - `PointValues`

- ## Nested Class Summary

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

  `Field.Store`

- ## Field Summary

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

  `fieldsData, name, type`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `FloatPoint(String name, float... point)`
  Creates a new FloatPoint, indexing the provided N-dimensional float point.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static float`
  `decodeDimension(byte[] value, int offset)`
  Decode single float dimension
  `static void`
  `encodeDimension(float value, byte[] dest, int offset)`
  Encode single float dimension
  `static Query`
  `newExactQuery(String field, float value)`
  Create a query for matching an exact float value.
  `static Query`
  `newRangeQuery(String field, float[] lowerValue, float[] upperValue)`
  Create a range query for n-dimensional float values.
  `static Query`
  `newRangeQuery(String field, float lowerValue, float upperValue)`
  Create a range query for float values.
  `static Query`
  `newSetQuery(String field, float... values)`
  Create a query matching any of the specified 1D values.
  `static Query`
  `newSetQuery(String field, Collection<Float> values)`
  Create a query matching any of the specified 1D values.
  `static float`
  `nextDown(float f)`
  Return the greatest float that compares less than `f` consistently with `Float.compare(float, float)`.
  `static float`
  `nextUp(float f)`
  Return the least float that compares greater than `f` consistently with `Float.compare(float, float)`.
  `Number`
  `numericValue()`
  Non-null if this field has a numeric value
  `static BytesRef`
  `pack(float... point)`
  Pack a float point into a BytesRef
  `void`
  `setBytesValue(BytesRef bytes)`
  Expert: change the value of this field.
  `void`
  `setFloatValue(float value)`
  Expert: change the value of this field.
  `void`
  `setFloatValues(float... point)`
  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, invertableType, name, readerValue, setBytesValue, setByteValue, setDoubleValue, setIntValue, setLongValue, setReaderValue, setShortValue, setStringValue, setTokenStream, storedValue, stringValue, tokenStream, tokenStreamValue`

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

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

- ## Constructor Details

  - ### FloatPoint

    public FloatPoint(String name, float... point)
    Creates a new FloatPoint, indexing the provided N-dimensional float point.
    Parameters:
      `name` - field name
      `point` - float[] value
    Throws:
      `IllegalArgumentException` - if the field name or value is null.

- ## Method Details

  - ### nextUp

    public static float nextUp(float f)
    Return the least float that compares greater than `f` consistently with `Float.compare(float, float)`. The only difference with `Math.nextUp(float)` is that this method returns `+0f` when the argument is `-0f`.

  - ### nextDown

    public static float nextDown(float f)
    Return the greatest float that compares less than `f` consistently with `Float.compare(float, float)`. The only difference with `Math.nextDown(float)` is that this method returns `-0f` when the argument is `+0f`.

  - ### setFloatValue

    public void setFloatValue(float value)
    Description copied from class: `Field`
    Expert: change the value of this field. See `Field.setStringValue(String)`.
    Overrides:
      `setFloatValue` in class `Field`

  - ### setFloatValues

    public void setFloatValues(float... point)
    Change the values of this field

  - ### setBytesValue

    public void setBytesValue(BytesRef bytes)
    Description copied from class: `Field`
    Expert: change the value of this field. See `Field.setStringValue(String)`.

    NOTE: the provided BytesRef is not copied so be sure not to change it until you're done with this field.

    Overrides:
      `setBytesValue` in class `Field`

  - ### numericValue

    public Number numericValue()
    Description copied from interface: `IndexableField`
    Non-null if this field has a numeric value
    Specified by:
      `numericValue` in interface `IndexableField`
    Overrides:
      `numericValue` in class `Field`

  - ### pack

    public static BytesRef pack(float... point)
    Pack a float point into a BytesRef
    Parameters:
      `point` - float[] value
    Throws:
      `IllegalArgumentException` - is the value is null or of zero length

  - ### toString

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

  - ### encodeDimension

    public static void encodeDimension(float value, byte[] dest, int offset)
    Encode single float dimension

  - ### decodeDimension

    public static float decodeDimension(byte[] value, int offset)
    Decode single float dimension

  - ### newExactQuery

    public static Query newExactQuery(String field, float value)
    Create a query for matching an exact float value.

    This is for simple one-dimension points, for multidimensional points use `newRangeQuery(String, float[], float[])` instead.

    Parameters:
      `field` - field name. must not be `null`.
      `value` - float value
    Returns:
      a query matching documents with this exact value
    Throws:
      `IllegalArgumentException` - if `field` is null.

  - ### newRangeQuery

    public static Query newRangeQuery(String field, float lowerValue, float upperValue)
    Create a range query for float values.

    This is for simple one-dimension ranges, for multidimensional ranges use `newRangeQuery(String, float[], float[])` instead.

    You can have half-open ranges (which are in fact </≤ or >/≥ queries) by setting `lowerValue = Float.NEGATIVE_INFINITY` or `upperValue = Float.POSITIVE_INFINITY`.

    Ranges are inclusive. For exclusive ranges, pass `nextUp(lowerValue)` or `nextDown(upperValue)`.

    Range comparisons are consistent with `Float.compareTo(Float)`.

    Parameters:
      `field` - field name. must not be `null`.
      `lowerValue` - lower portion of the range (inclusive).
      `upperValue` - upper portion of the range (inclusive).
    Returns:
      a query matching documents within this range.
    Throws:
      `IllegalArgumentException` - if `field` is null.

  - ### newRangeQuery

    public static Query newRangeQuery(String field, float[] lowerValue, float[] upperValue)
    Create a range query for n-dimensional float values.

    You can have half-open ranges (which are in fact </≤ or >/≥ queries) by setting `lowerValue[i] = Float.NEGATIVE_INFINITY` or `upperValue[i] = Float.POSITIVE_INFINITY`.

    Ranges are inclusive. For exclusive ranges, pass `Math#nextUp(lowerValue[i])` or `Math.nextDown(upperValue[i])`.

    Range comparisons are consistent with `Float.compareTo(Float)`.

    Parameters:
      `field` - field name. must not be `null`.
      `lowerValue` - lower portion of the range (inclusive). must not be `null`.
      `upperValue` - upper portion of the range (inclusive). must not be `null`.
    Returns:
      a query matching documents within this range.
    Throws:
      `IllegalArgumentException` - if `field` is null, if `lowerValue` is null, if `upperValue` is null, or if `lowerValue.length != upperValue.length`

  - ### newSetQuery

    public static Query newSetQuery(String field, float... values)
    Create a query matching any of the specified 1D values. This is the points equivalent of `TermsQuery`.
    Parameters:
      `field` - field name. must not be `null`.
      `values` - all values to match

  - ### newSetQuery

    public static Query newSetQuery(String field, Collection<Float> values)
    Create a query matching any of the specified 1D values. This is the points equivalent of `TermsQuery`.
    Parameters:
      `field` - field name. must not be `null`.
      `values` - all values to match