A field is a section of a Document. Each field has two parts, a name and a
value. Values may be free text, provided as a String or as a Reader, or they
may be atomic keywords, which are not further processed. Such keywords may
be used to represent dates, urls, etc. Fields are optionally stored in the
index, so that they may be returned with hits on the document.
The Field..::..Index type exposes the following members.
Methods
Name | Description | |
---|---|---|
Equals | Resolves the deserialized instance to the local reference for accurate
equals() and == comparisons.
(Inherited from Parameter.) | |
Finalize | Allows an Object to attempt to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) | |
GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) | |
GetType | Gets the Type of the current instance. (Inherited from Object.) | |
MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) | |
ToString | (Inherited from Parameter.) |
Fields
Name | Description | |
---|---|---|
ANALYZED | Index the tokens produced by running the field's
value through an Analyzer. This is useful for
common text.
| |
ANALYZED_NO_NORMS | Expert: Index the tokens produced by running the
field's value through an Analyzer, and also
separately disable the storing of norms. See
{@link #NOT_ANALYZED_NO_NORMS} for what norms are
and why you may want to disable them.
| |
NO | Do not index the field value. This field can thus not be searched,
but one can still access its contents provided it is
{@link Field.Store stored}.
| |
NO_NORMS | Obsolete. | |
NOT_ANALYZED | Index the field's value without using an Analyzer, so it can be searched.
As no analyzer is used the value will be stored as a single term. This is
useful for unique Ids like product numbers.
| |
NOT_ANALYZED_NO_NORMS | Expert: Index the field's value without an Analyzer,
and also disable the storing of norms. Note that you
can also separately enable/disable norms by calling
{@link Field#setOmitNorms}. No norms means that
index-time field and document boosting and field
length normalization are disabled. The benefit is
less memory usage as norms take up one byte of RAM
per indexed field for every document in the index,
during searching. Note that once you index a given
field with norms enabled, disabling norms will
have no effect. In other words, for this to have the
above described effect on a field, all instances of
that field must be indexed with NOT_ANALYZED_NO_NORMS
from the beginning.
| |
TOKENIZED | Obsolete. | |
UN_TOKENIZED | Obsolete. |