FloatFieldSource (Lucene 3.6.2 API)
Keywords: org.apache.lucene.search.function.FloatFieldSource class

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## org.apache.lucene.search.function
Class FloatFieldSource

    java.lang.Object
      org.apache.lucene.search.function.ValueSource
          org.apache.lucene.search.function.FieldCacheSource
              org.apache.lucene.search.function.FloatFieldSource

All Implemented Interfaces:
  Serializable

    public class FloatFieldSource

extends FieldCacheSource

Expert: obtains float field values from the `FieldCache` using `getFloats()` and makes those values available as other numeric types, casting as needed.

See Also:
  `for requirements on the field.

  NOTE: with the switch in 2.9 to segment-based searching, if {@link #getValues} is invoked with a composite (multi-segment) reader, this can easily cause double RAM usage for the values in the FieldCache. It's best to switch your application to pass only atomic (single segment) readers to this API.

  `, Serialized Form
WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary
`FloatFieldSource(String field)` Create a cached float field source with default string-to-float parser.
`FloatFieldSource(String field, FieldCache.FloatParser parser)` Create a cached float field source with a specific string-to-float parser.

Method Summary
`boolean` | `cachedFieldSourceEquals(FieldCacheSource o)` Check if equals to another `FieldCacheSource`, already knowing that cache and field are equal.
`int` | `cachedFieldSourceHashCode()` Return a hash code of a `FieldCacheSource`, without the hash-codes of the field and the cache (those are taken care of elsewhere).
`String` | `description()` description of field, used in explain()
`DocValues` | `getCachedFieldValues(FieldCache cache, String field, IndexReader reader)` Return cached DocValues for input field and reader.

Methods inherited from class org.apache.lucene.search.function.FieldCacheSource
`equals, getValues, hashCode`

Methods inherited from class org.apache.lucene.search.function.ValueSource
`toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### FloatFieldSource

    public FloatFieldSource(String field)

  Create a cached float field source with default string-to-float parser.

### FloatFieldSource

    public FloatFieldSource(String field,
                            FieldCache.FloatParser parser)

  Create a cached float field source with a specific string-to-float parser.

Method Detail

### description

    public String description()

  Description copied from class: `ValueSource`
  description of field, used in explain()

  Overrides:
    `description` in class `FieldCacheSource`

### getCachedFieldValues

    public DocValues getCachedFieldValues(FieldCache cache,
                                          String field,
                                          IndexReader reader)
                                   throws IOException

  Description copied from class: `FieldCacheSource`
  Return cached DocValues for input field and reader.

  Specified by:
    `getCachedFieldValues` in class `FieldCacheSource`
  Parameters:
    `cache` - FieldCache so that values of a field are loaded once per reader (RAM allowing)
    `field` - Field for which values are required.
  Throws:
    `IOException`
  See Also:
    `ValueSource`

### cachedFieldSourceEquals

    public boolean cachedFieldSourceEquals(FieldCacheSource o)

  Description copied from class: `FieldCacheSource`
  Check if equals to another `FieldCacheSource`, already knowing that cache and field are equal.

  Specified by:
    `cachedFieldSourceEquals` in class `FieldCacheSource`
  See Also:
    `Object.equals(java.lang.Object)`

### cachedFieldSourceHashCode

    public int cachedFieldSourceHashCode()

  Description copied from class: `FieldCacheSource`
  Return a hash code of a `FieldCacheSource`, without the hash-codes of the field and the cache (those are taken care of elsewhere).

  Specified by:
    `cachedFieldSourceHashCode` in class `FieldCacheSource`
  See Also:
    `Object.hashCode()`

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