Package org.apache.lucene.index
Class Fields
java.lang.Object
org.apache.lucene.index.Fields
- Direct Known Subclasses:
FieldsProducer
,FilterLeafReader.FilterFields
,MultiFields
Provides a
Terms
index for fields that have it, and lists which fields do. This is
primarily an internal/experimental API (see FieldsProducer
), although it is also used to
expose the set of term vectors per document.- WARNING: This API is experimental and might change in incompatible ways in the next release.
-
Field Details
-
EMPTY_ARRAY
Zero-lengthFields
array.
-
-
Constructor Details
-
Fields
protected Fields()Sole constructor. (For invocation by subclass constructors, typically implicit.)
-
-
Method Details
-
iterator
Returns an iterator that will step through all fields names. This will not return null. -
terms
Get theTerms
for this field. This will return null if the field does not exist.- Throws:
IOException
-
size
public abstract int size()Returns the number of fields or -1 if the number of distinct field names is unknown. If >= 0,iterator()
will return as many field names.
-