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## org.apache.lucene.index
Class DocsEnum

    java.lang.Object
      org.apache.lucene.search.DocIdSetIterator
          org.apache.lucene.index.DocsEnum

Direct Known Subclasses:
  DocsAndPositionsEnum, FilterAtomicReader.FilterDocsEnum, MappingMultiDocsEnum, MultiDocsEnum, Scorer

    public abstract class DocsEnum

extends DocIdSetIterator

Iterates through the documents and term freqs. NOTE: you must first call `DocIdSetIterator.nextDoc()` before using any of the per-doc methods.

Field Summary
`static int` | `FLAG_FREQS` Flag to pass to `TermsEnum.docs(Bits,DocsEnum,int)` if you require term frequencies in the returned enum.
`static int` | `FLAG_NONE` Flag to pass to `TermsEnum.docs(Bits,DocsEnum,int)` if you don't require term frequencies in the returned enum.

Fields inherited from class org.apache.lucene.search.DocIdSetIterator
`NO_MORE_DOCS`

Constructor Summary
`protected` | `DocsEnum()` Sole constructor.

Method Summary
`AttributeSource` | `attributes()` Returns the related attributes.
`abstract int` | `freq()` Returns term frequency in the current document, or 1 if the field was indexed with `FieldInfo.IndexOptions.DOCS_ONLY`.

Methods inherited from class org.apache.lucene.search.DocIdSetIterator
`advance, cost, docID, nextDoc, slowAdvance`

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

Field Detail

### FLAG_NONE

    public static final int FLAG_NONE

  Flag to pass to `TermsEnum.docs(Bits,DocsEnum,int)` if you don't require term frequencies in the returned enum. When passed to `TermsEnum.docsAndPositions(Bits,DocsAndPositionsEnum,int)` means that no offsets and payloads will be returned.

  See Also:
    Constant Field Values

### FLAG_FREQS

    public static final int FLAG_FREQS

  Flag to pass to `TermsEnum.docs(Bits,DocsEnum,int)` if you require term frequencies in the returned enum.

  See Also:
    Constant Field Values

Constructor Detail

### DocsEnum

    protected DocsEnum()

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

Method Detail

### freq

    public abstract int freq()
                      throws IOException

  Returns term frequency in the current document, or 1 if the field was indexed with `FieldInfo.IndexOptions.DOCS_ONLY`. Do not call this before `DocIdSetIterator.nextDoc()` is first called, nor after `DocIdSetIterator.nextDoc()` returns `DocIdSetIterator.NO_MORE_DOCS`.

  NOTE: if the `DocsEnum` was obtain with `FLAG_NONE`, the result of this method is undefined.

  Throws:
    `IOException`

### attributes

    public AttributeSource attributes()

  Returns the related attributes.

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