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## org.apache.lucene.search
Class FieldValueFilter

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

All Implemented Interfaces:
  Serializable

    public class FieldValueFilter

extends Filter

A `Filter` that accepts all documents that have one or more values in a given field. This `Filter` request `Bits` from the `FieldCache` and build the bits if not present.

See Also:
  Serialized Form

Constructor Summary
`FieldValueFilter(String field)` Creates a new `FieldValueFilter`
`FieldValueFilter(String field, boolean negate)` Creates a new `FieldValueFilter`

Method Summary
`boolean` | `equals(Object obj)`
`String` | `field()` Returns the field this filter is applied on.
`DocIdSet` | `getDocIdSet(IndexReader reader)` Creates a `DocIdSet` enumerating the documents that should be permitted in search results.
`int` | `hashCode()`
`boolean` | `negate()` Returns `true` iff this filter is negated, otherwise `false`
`String` | `toString()`

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

Constructor Detail

### FieldValueFilter

    public FieldValueFilter(String field)

  Creates a new `FieldValueFilter`

  Parameters:
    `field` - the field to filter

### FieldValueFilter

    public FieldValueFilter(String field,
                            boolean negate)

  Creates a new `FieldValueFilter`

  Parameters:
    `field` - the field to filter
    `negate` - iff `true` all documents with no value in the given field are accepted.

Method Detail

### field

    public String field()

  Returns the field this filter is applied on.

  Returns:
    the field this filter is applied on.

### negate

    public boolean negate()

  Returns `true` iff this filter is negated, otherwise `false`

  Returns:
    `true` iff this filter is negated, otherwise `false`

### getDocIdSet

    public DocIdSet getDocIdSet(IndexReader reader)
                         throws IOException

  Description copied from class: `Filter`
  Creates a `DocIdSet` enumerating the documents that should be permitted in search results. NOTE: null can be returned if no documents are accepted by this Filter.

  Note: This method will be called once per segment in the index during searching. The returned `DocIdSet` must refer to document IDs for that segment, not for the top-level reader.

  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`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

### equals

    public boolean equals(Object obj)

  Overrides:
    `equals` in class `Object`

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

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