Package org.apache.lucene.index
Enum FieldInfo.IndexOptions
- java.lang.Object
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- java.lang.Enum<FieldInfo.IndexOptions>
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- org.apache.lucene.index.FieldInfo.IndexOptions
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- 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.
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Enum Constant Summary
Enum Constants Enum Constant 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.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method 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.
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Enum Constant Detail
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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.
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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.
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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.
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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.
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Method Detail
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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
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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 nameNullPointerException
- if the argument is null
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