org.apache.lucene.index

Enum FieldInfo.IndexOptions

java.lang.Object

java.lang.Enum<FieldInfo.IndexOptions>

org.apache.lucene.index.FieldInfo.IndexOptions

All Implemented Interfaces:

Serializable, Comparable<FieldInfo.IndexOptions>

Enclosing class:

FieldInfo

public static enum FieldInfo.IndexOptions
extends Enum<FieldInfo.IndexOptions>

Controls how much information is stored in the postings lists.

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

Enum Constant Summary

Enum Constants

Enum Constant and Description
DOCS_AND_FREQS Only documents and term frequencies are indexed: positions are omitted.
DOCS_AND_FREQS_AND_POSITIONS Indexes documents, frequencies and positions.
DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS Indexes documents, frequencies, positions and offsets.
DOCS_ONLY Only documents are indexed: term frequencies and positions are omitted.

Method Summary

Methods

Modifier and Type	Method and Description
static FieldInfo.IndexOptions	valueOf(String name) Returns the enum constant of this type with the specified name.
static FieldInfo.IndexOptions[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

DOCS_ONLY

public static final FieldInfo.IndexOptions DOCS_ONLY

Only documents are indexed: term frequencies and positions are omitted. Phrase and other positional queries on the field will throw an exception, and scoring will behave as if any term in the document appears only once.

DOCS_AND_FREQS

public static final FieldInfo.IndexOptions DOCS_AND_FREQS

Only documents and term frequencies are indexed: positions are omitted. This enables normal scoring, except Phrase and other positional queries will throw an exception.

DOCS_AND_FREQS_AND_POSITIONS

public static final FieldInfo.IndexOptions DOCS_AND_FREQS_AND_POSITIONS

Indexes documents, frequencies and positions. This is a typical default for full-text search: full scoring is enabled and positional queries are supported.

DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS

public static final FieldInfo.IndexOptions DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS

Indexes documents, frequencies, positions and offsets. Character offsets are encoded alongside the positions.

Method Detail

values

public static FieldInfo.IndexOptions[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (FieldInfo.IndexOptions c : FieldInfo.IndexOptions.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static FieldInfo.IndexOptions valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null