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## org.apache.lucene.search
Class MultiTermQueryWrapperFilter<Q extends MultiTermQuery>

    java.lang.Object
      org.apache.lucene.search.Filter
          org.apache.lucene.search.MultiTermQueryWrapperFilter<Q>

All Implemented Interfaces:
  Serializable

Direct Known Subclasses:
  NumericRangeFilter, PrefixFilter, TermRangeFilter

    public class MultiTermQueryWrapperFilter<Q extends MultiTermQuery>

extends Filter

A wrapper for `MultiTermQuery`, that exposes its functionality as a `Filter`.

`MultiTermQueryWrapperFilter` is not designed to be used by itself. Normally you subclass it to provide a Filter counterpart for a `MultiTermQuery` subclass.

For example, `TermRangeFilter` and `PrefixFilter` extend `MultiTermQueryWrapperFilter`. This class also provides the functionality behind `MultiTermQuery.CONSTANT_SCORE_FILTER_REWRITE`; this is why it is not abstract.

See Also:
  Serialized Form

Field Summary
`protected Q` | `query`

Constructor Summary
`protected` | `MultiTermQueryWrapperFilter(Q query)` Wrap a `MultiTermQuery` as a Filter.

Method Summary
`void` | `clearTotalNumberOfTerms()` Deprecated. Don't use this method, as its not thread safe and useless.
`boolean` | `equals(Object o)`
`DocIdSet` | `getDocIdSet(IndexReader reader)` Returns a DocIdSet with documents that should be permitted in search results.
`int` | `getTotalNumberOfTerms()` Deprecated. Don't use this method, as its not thread safe and useless.
`int` | `hashCode()`
`String` | `toString()`

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

Field Detail

### query

    protected final Q extends MultiTermQuery query

Constructor Detail

### MultiTermQueryWrapperFilter

    protected MultiTermQueryWrapperFilter(Q query)

  Wrap a `MultiTermQuery` as a Filter.

Method Detail

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### equals

    public final boolean equals(Object o)

  Overrides:
    `equals` in class `Object`

### hashCode

    public final int hashCode()

  Overrides:
    `hashCode` in class `Object`

### getTotalNumberOfTerms

    @Deprecated
    public int getTotalNumberOfTerms()

  Deprecated. Don't use this method, as its not thread safe and useless.

  Expert: Return the number of unique terms visited during execution of the filter. If there are many of them, you may consider using another filter type or optimize your total term count in index.

  This method is not thread safe, be sure to only call it when no filter is running! If you re-use the same filter instance for another search, be sure to first reset the term counter with `clearTotalNumberOfTerms()`.

  See Also:
    `clearTotalNumberOfTerms()`

### clearTotalNumberOfTerms

    @Deprecated
    public void clearTotalNumberOfTerms()

  Deprecated. Don't use this method, as its not thread safe and useless.

  Expert: Resets the counting of unique terms. Do this before executing the filter.

  See Also:
    `getTotalNumberOfTerms()`

### getDocIdSet

    public DocIdSet getDocIdSet(IndexReader reader)
                         throws IOException

  Returns a DocIdSet with documents that should be permitted in search results.

  Specified by:
    `getDocIdSet` in class `Filter`
  Parameters:
    `reader` - a `IndexReader` instance opened on the index currently searched on. Note, it is likely that the provided reader does not represent the whole underlying index i.e. if the index has more than one segment the given reader only represents a single segment.
  Returns:
    a DocIdSet that provides the documents which should be permitted or prohibited in search results. NOTE: null can be returned if no documents will be accepted by this Filter.
  Throws:
    `IOException`
  See Also:
    `DocIdBitSet`

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