Package org.apache.lucene.codecs

Class DocValuesProducer

java.lang.Object

org.apache.lucene.codecs.DocValuesProducer

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

EmptyDocValuesProducer

public abstract class DocValuesProducer
extends Object
implements Closeable

Abstract API that produces numeric, binary, sorted, sortedset, and sortednumeric docvalues.

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

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DocValuesProducer()	Sole constructor.

Method Summary

Modifier and Type	Method	Description
abstract void	checkIntegrity()	Checks consistency of this producer
abstract BinaryDocValues	getBinary(FieldInfo field)	Returns BinaryDocValues for this field.
DocValuesProducer	getMergeInstance()	Returns an instance optimized for merging.
abstract NumericDocValues	getNumeric(FieldInfo field)	Returns NumericDocValues for this field.
abstract SortedDocValues	getSorted(FieldInfo field)	Returns SortedDocValues for this field.
abstract SortedNumericDocValues	getSortedNumeric(FieldInfo field)	Returns SortedNumericDocValues for this field.
abstract SortedSetDocValues	getSortedSet(FieldInfo field)	Returns SortedSetDocValues for this field.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.io.Closeable

close

Constructor Details

DocValuesProducer

protected DocValuesProducer()

Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Details

getNumeric

public abstract NumericDocValues getNumeric(FieldInfo field)
                                     throws IOException

Returns NumericDocValues for this field. The returned instance need not be thread-safe: it will only be used by a single thread. The behavior is undefined if the doc values type of the given field is not DocValuesType.NUMERIC. The return value is never null.

Throws:

IOException

getBinary

public abstract BinaryDocValues getBinary(FieldInfo field)
                                   throws IOException

Returns BinaryDocValues for this field. The returned instance need not be thread-safe: it will only be used by a single thread. The behavior is undefined if the doc values type of the given field is not DocValuesType.BINARY. The return value is never null.

Throws:

IOException

getSorted

public abstract SortedDocValues getSorted(FieldInfo field)
                                   throws IOException

Returns SortedDocValues for this field. The returned instance need not be thread-safe: it will only be used by a single thread. The behavior is undefined if the doc values type of the given field is not DocValuesType.SORTED. The return value is never null.

Throws:

IOException

getSortedNumeric

public abstract SortedNumericDocValues getSortedNumeric(FieldInfo field)
                                                 throws IOException

Returns SortedNumericDocValues for this field. The returned instance need not be thread-safe: it will only be used by a single thread. The behavior is undefined if the doc values type of the given field is not DocValuesType.SORTED_NUMERIC. The return value is never null.

Throws:

IOException

getSortedSet

public abstract SortedSetDocValues getSortedSet(FieldInfo field)
                                         throws IOException

Returns SortedSetDocValues for this field. The returned instance need not be thread-safe: it will only be used by a single thread. The behavior is undefined if the doc values type of the given field is not DocValuesType.SORTED_SET. The return value is never null.

Throws:

IOException

checkIntegrity

public abstract void checkIntegrity()
                             throws IOException

Checks consistency of this producer

Note that this may be costly in terms of I/O, e.g. may involve computing a checksum value against large data files.

Throws:

IOException

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

getMergeInstance

public DocValuesProducer getMergeInstance()

Returns an instance optimized for merging. This instance may only be consumed in the thread that called getMergeInstance().

The default implementation returns this