org.apache.lucene.codecs

Class NormsFormat

java.lang.Object

org.apache.lucene.codecs.NormsFormat

Direct Known Subclasses:

Lucene53NormsFormat

public abstract class NormsFormat
extends Object

Encodes/decodes per-document score normalization values.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NormsFormat() Sole constructor.

Method Summary

Modifier and Type	Method and Description
abstract NormsConsumer	normsConsumer(SegmentWriteState state) Returns a NormsConsumer to write norms to the index.
abstract NormsProducer	normsProducer(SegmentReadState state) Returns a NormsProducer to read norms from the index.

Methods inherited from class java.lang.Object

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

Constructor Detail

NormsFormat

protected NormsFormat()

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

Method Detail

normsConsumer

public abstract NormsConsumer normsConsumer(SegmentWriteState state)
                                     throws IOException

Returns a NormsConsumer to write norms to the index.

Throws:

IOException

normsProducer

public abstract NormsProducer normsProducer(SegmentReadState state)
                                     throws IOException

Returns a NormsProducer to read norms from the index.

NOTE: by the time this call returns, it must hold open any files it will need to use; else, those files may be deleted. Additionally, required files may be deleted during the execution of this call before there is a chance to open them. Under these circumstances an IOException should be thrown by the implementation. IOExceptions are expected and will automatically cause a retry of the segment opening logic with the newly revised segments.

Throws:

IOException