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## org.apache.lucene.search
Class BooleanFilter

    java.lang.Object
      org.apache.lucene.search.Filter
          org.apache.lucene.search.BooleanFilter

All Implemented Interfaces:
  Serializable, Iterable<FilterClause>

    public class BooleanFilter

extends Filter
implements Iterable<FilterClause>

A container Filter that allows Boolean composition of Filters. Filters are allocated into one of three logical constructs; SHOULD, MUST NOT, MUST The results Filter BitSet is constructed as follows: SHOULD Filters are OR'd together The resulting Filter is NOT'd with the NOT Filters The resulting Filter is AND'd with the MUST Filters

See Also:
  Serialized Form

Constructor Summary
`BooleanFilter()`

Method Summary
`void` | `add(Filter filter, BooleanClause.Occur occur)`
`void` | `add(FilterClause filterClause)` Adds a new FilterClause to the Boolean Filter container
`List<FilterClause>` | `clauses()` Returns the list of clauses
`boolean` | `equals(Object obj)`
`DocIdSet` | `getDocIdSet(IndexReader reader)` Returns the a DocIdSetIterator representing the Boolean composition of the filters that have been added.
`int` | `hashCode()`
`Iterator<FilterClause>` | `iterator()` Returns an iterator on the clauses in this query.
`String` | `toString()` Prints a user-readable version of this Filter.

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

Constructor Detail

### BooleanFilter

    public BooleanFilter()

Method Detail

### getDocIdSet

    public DocIdSet getDocIdSet(IndexReader reader)
                         throws IOException

  Returns the a DocIdSetIterator representing the Boolean composition of the filters that have been added.

  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`

### add

    public void add(FilterClause filterClause)

  Adds a new FilterClause to the Boolean Filter container

  Parameters:
    `filterClause` - A FilterClause object containing a Filter and an Occur parameter

### add

    public final void add(Filter filter,
                          BooleanClause.Occur occur)

### clauses

    public List<FilterClause> clauses()

  Returns the list of clauses

### iterator

    public final Iterator<FilterClause> iterator()

  Returns an iterator on the clauses in this query. It implements the `Iterable` interface to make it possible to do:

      for (FilterClause clause : booleanFilter) {}

  Specified by:
    `iterator` in interface `Iterable<FilterClause>`

### equals

    public boolean equals(Object obj)

  Overrides:
    `equals` in class `Object`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

### toString

    public String toString()

  Prints a user-readable version of this Filter.

  Overrides:
    `toString` in class `Object`

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