Package org.apache.lucene.document

The logical representation of a Document for indexing and searching.

The document package provides the user level logical representation of content to be indexed and searched. The package also provides utilities for working with Documents and IndexableFields.

Document and IndexableField

A Document is a collection of IndexableFields. A IndexableField is a logical representation of a user's content that needs to be indexed or stored. IndexableFields have a number of properties that tell Lucene how to treat the content (like indexed, tokenized, stored, etc.) See the Field implementation of IndexableField for specifics on these properties.

Note: it is common to refer to Documents having Fields, even though technically they have IndexableFields.

Working with Documents

First and foremost, a Document is something created by the user application. It is your job to create Documents based on the content of the files you are working with in your application (Word, txt, PDF, Excel or any other format.) How this is done is completely up to you. That being said, there are many tools available in other projects that can make the process of taking a file and converting it into a Lucene Document.

The DateTools is a utility class to make dates and times searchable (remember, Lucene only searches text). IntField, LongField, FloatField and DoubleField are a special helper class to simplify indexing of numeric values (and also dates) for fast range range queries with NumericRangeQuery (using a special sortable string representation of numeric values).

Class Summary

Class	Description
BinaryDocValuesField	Field that stores a per-document BytesRef value.
ByteDocValuesField	Deprecated. use NumericDocValuesField instead.
CompressionTools	Simple utility class providing static methods to compress and decompress binary data for stored fields.
DateTools	Provides support for converting dates to strings and vice-versa.
DerefBytesDocValuesField	Deprecated. Use BinaryDocValuesField instead.
Document	Documents are the unit of indexing and search.
DocumentStoredFieldVisitor	A StoredFieldVisitor that creates a Document containing all stored fields, or only specific requested fields provided to DocumentStoredFieldVisitor(Set).
DoubleDocValuesField	Syntactic sugar for encoding doubles as NumericDocValues via Double.doubleToRawLongBits(double).
DoubleField	Field that indexes double values for efficient range filtering and sorting.
Field	Expert: directly create a field for a document.
FieldType	Describes the properties of a field.
FloatDocValuesField	Syntactic sugar for encoding floats as NumericDocValues via Float.floatToRawIntBits(float).
FloatField	Field that indexes float values for efficient range filtering and sorting.
IntDocValuesField	Deprecated. use NumericDocValuesField instead.
IntField	Field that indexes int values for efficient range filtering and sorting.
LazyDocument	Defers actually loading a field's value until you ask for it.
LongDocValuesField	Deprecated. use NumericDocValuesField instead.
LongField	Field that indexes long values for efficient range filtering and sorting.
NumericDocValuesField	Field that stores a per-document long value for scoring, sorting or value retrieval.
PackedLongDocValuesField	Deprecated. use NumericDocValuesField instead.
ShortDocValuesField	Deprecated. use NumericDocValuesField instead.
SortedBytesDocValuesField	Deprecated. Use SortedDocValuesField instead.
SortedDocValuesField	Field that stores a per-document BytesRef value, indexed for sorting.
SortedSetDocValuesField	Field that stores a set of per-document BytesRef values, indexed for faceting,grouping,joining.
StoredField	A field whose value is stored so that IndexSearcher.doc(int) and IndexReader.document(int, org.apache.lucene.index.StoredFieldVisitor) will return the field and its value.
StraightBytesDocValuesField	Deprecated. Use BinaryDocValuesField instead.
StringField	A field that is indexed but not tokenized: the entire String value is indexed as a single token.
TextField	A field that is indexed and tokenized, without term vectors.

Enum Summary

Enum	Description
DateTools.Resolution	Specifies the time granularity.
Field.Index	Deprecated. This is here only to ease transition from the pre-4.0 APIs.
Field.Store	Specifies whether and how a field should be stored.
Field.TermVector	Deprecated. This is here only to ease transition from the pre-4.0 APIs.
FieldType.NumericType	Data type of the numeric value