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## org.apache.lucene.queries.function.valuesource
Class IDFValueSource

    java.lang.Object
      org.apache.lucene.queries.function.ValueSource
          org.apache.lucene.queries.function.valuesource.DocFreqValueSource
              org.apache.lucene.queries.function.valuesource.IDFValueSource

    public class IDFValueSource

extends DocFreqValueSource

Function that returns `#idf(long, long)` for every document.

Note that the configured Similarity for the field must be a subclass of `TFIDFSimilarity`

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

Field Summary

Fields inherited from class org.apache.lucene.queries.function.valuesource.DocFreqValueSource
`field, indexedBytes, indexedField, val`

Constructor Summary
`IDFValueSource(String field, String val, String indexedField, BytesRef indexedBytes)`

Method Summary
`FunctionValues` | `getValues(Map context, AtomicReaderContext readerContext)` Gets the values for this reader and the context that was previously passed to createWeight()
`String` | `name()`

Methods inherited from class org.apache.lucene.queries.function.valuesource.DocFreqValueSource
`createWeight, description, equals, hashCode`

Methods inherited from class org.apache.lucene.queries.function.ValueSource
`getSortField, newContext, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### IDFValueSource

    public IDFValueSource(String field,
                          String val,
                          String indexedField,
                          BytesRef indexedBytes)

Method Detail

### name

    public String name()

  Overrides:
    `name` in class `DocFreqValueSource`

### getValues

    public FunctionValues getValues(Map context,
                                    AtomicReaderContext readerContext)
                             throws IOException

  Description copied from class: `ValueSource`
  Gets the values for this reader and the context that was previously passed to createWeight()

  Overrides:
    `getValues` in class `DocFreqValueSource`
  Throws:
    `IOException`

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