org.apache.lucene.document
Class DerefBytesDocValuesField

java.lang.Object
  org.apache.lucene.document.Field
      org.apache.lucene.document.DerefBytesDocValuesField

All Implemented Interfaces:

IndexableField

public class DerefBytesDocValuesField
extends Field

Field that stores a per-document BytesRef value. The values are stored indirectly, such that many documents sharing the same value all point to a single copy of the value, which is a good fit when the fields share values. If values are (mostly) unique it's better to use StraightBytesDocValuesField. Here's an example usage:

   document.add(new DerefBytesDocValuesField(name, new BytesRef("hello")));
 

If you also need to store the value, you should add a separate StoredField instance.

See Also:

DocValues

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.document.Field

Field.Index, Field.Store, Field.TermVector

Field Summary

static FieldType	TYPE_FIXED_LEN Type for indirect bytes DocValues: all with the same length
static FieldType	TYPE_VAR_LEN Type for indirect bytes DocValues: can have variable lengths

Fields inherited from class org.apache.lucene.document.Field

boost, fieldsData, name, tokenStream, type

Constructor Summary

DerefBytesDocValuesField(String name, BytesRef bytes)
Create a new variable-length indirect DocValues field.

DerefBytesDocValuesField(String name, BytesRef bytes, boolean isFixedLength)
Create a new fixed or variable length indirect DocValues field.

Method Summary

Methods inherited from class org.apache.lucene.document.Field

binaryValue, boost, fieldType, name, numericValue, readerValue, setBoost, setBytesValue, setBytesValue, setByteValue, setDoubleValue, setFloatValue, setIntValue, setLongValue, setReaderValue, setShortValue, setStringValue, setTokenStream, stringValue, tokenStream, tokenStreamValue, toString, translateFieldType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

TYPE_FIXED_LEN

public static final FieldType TYPE_FIXED_LEN

Type for indirect bytes DocValues: all with the same length

TYPE_VAR_LEN

public static final FieldType TYPE_VAR_LEN

Type for indirect bytes DocValues: can have variable lengths

Constructor Detail

DerefBytesDocValuesField

public DerefBytesDocValuesField(String name,
                                BytesRef bytes)

Create a new variable-length indirect DocValues field.

This calls DerefBytesDocValuesField(name, bytes, false, meaning by default it allows for values of different lengths. If your values are all the same length, use that constructor instead.

Parameters:

name - field name

bytes - binary content

Throws:

IllegalArgumentException - if the field name is null

DerefBytesDocValuesField

public DerefBytesDocValuesField(String name,
                                BytesRef bytes,
                                boolean isFixedLength)

Create a new fixed or variable length indirect DocValues field.

Parameters:

name - field name

bytes - binary content

isFixedLength - true if all values have the same length.

Throws:

IllegalArgumentException - if the field name is null