## org.apache.lucene.codecs.lucene40
Class Lucene40NormsFormat

    java.lang.Object
      org.apache.lucene.codecs.NormsFormat
          org.apache.lucene.codecs.lucene40.Lucene40NormsFormat

Deprecated. Only for reading old 4.0 and 4.1 segments

    @Deprecated
    public class Lucene40NormsFormat

extends NormsFormat

Lucene 4.0 Norms Format.

Files:

- `.nrm.cfs`: `compound container`
- `.nrm.cfe`: `compound entries`

Norms are implemented as DocValues, so other than file extension, norms are written exactly the same way as `DocValues`.

See Also:
  `Lucene40DocValuesFormat`
WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary
`Lucene40NormsFormat()` Deprecated. Sole constructor.

Method Summary
`DocValuesConsumer` `normsConsumer(SegmentWriteState state)` Deprecated. Returns a `DocValuesConsumer` to write norms to the index.
`DocValuesProducer` `normsProducer(SegmentReadState state)` Deprecated. Returns a `DocValuesProducer` 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

### Lucene40NormsFormat

    public Lucene40NormsFormat()

  Deprecated.
  Sole constructor.

Method Detail

### normsConsumer

    public DocValuesConsumer normsConsumer(SegmentWriteState state)
                                    throws IOException

  Deprecated.
  Description copied from class: `NormsFormat`
  Returns a `DocValuesConsumer` to write norms to the index.

  Specified by:
    `normsConsumer` in class `NormsFormat`
  Throws:
    `IOException`

### normsProducer

    public DocValuesProducer normsProducer(SegmentReadState state)
                                    throws IOException

  Deprecated.
  Description copied from class: `NormsFormat`
  Returns a `DocValuesProducer` 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.

  Specified by:
    `normsProducer` in class `NormsFormat`
  Throws:
    `IOException`

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