```
public class LongFieldSource
extends FieldCacheSource
```
Obtains long field values from FieldCache.getLongs(org.apache.lucene.index.AtomicReader, java.lang.String, boolean) and makes those values available as other numeric types, casting as needed.

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`description()`	description of field, used in explain()
`boolean`	`equals(Object o)`
`long`	`externalToLong(String extVal)`
`FunctionValues`	`getValues(Map context, AtomicReaderContext readerContext)`	Gets the values for this reader and the context that was previously passed to createWeight()
`int`	`hashCode()`
`Object`	`longToObject(long val)`
`String`	`longToString(long val)`

Methods inherited from class org.apache.lucene.queries.function.valuesource.FieldCacheSource
getField, getFieldCache

Methods inherited from class org.apache.lucene.queries.function.ValueSource
createWeight, getSortField, newContext, toString

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

public LongFieldSource(String field)

public LongFieldSource(String field,
                       FieldCache.LongParser parser)

Constructor	Description
`LongFieldSource(String field)`
`LongFieldSource(String field, FieldCache.LongParser parser)`

Class LongFieldSource