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## org.modeshape.search.lucene.query
Class HasValueQuery

    java.lang.Object
      org.apache.lucene.search.Query
          org.modeshape.search.lucene.query.HasValueQuery

All Implemented Interfaces:
  Serializable, Cloneable

    public class HasValueQuery

extends org.apache.lucene.search.Query

A Lucene `Query` implementation that is satisfied if there is at least one value for a document.

See Also:
  Serialized Form

Nested Class Summary
`protected class` | `HasValueQuery.ExistsScorer` A scorer for the Path query.
`protected class` | `HasValueQuery.ExistsWeight` Calculates query weights and builds query scores for our NOT queries.

Field Summary
`protected String` | `fieldName`
`protected org.apache.lucene.document.FieldSelector` | `fieldSelector`

Constructor Summary
`HasValueQuery(String fieldName)` Construct a `Query` implementation that scores nodes according to the supplied comparator.

Method Summary
`Object` | `clone()`
`org.apache.lucene.search.Weight` | `createWeight(org.apache.lucene.search.Searcher searcher)`
`protected boolean` | `hasValue(org.apache.lucene.index.IndexReader reader, int docId)`
`String` | `toString(String field)`

Methods inherited from class org.apache.lucene.search.Query
`combine, equals, extractTerms, getBoost, getSimilarity, hashCode, mergeBooleanQueries, rewrite, setBoost, toString, weight`

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

Field Detail

### fieldName

    protected final String fieldName

### fieldSelector

    protected final org.apache.lucene.document.FieldSelector fieldSelector

Constructor Detail

### HasValueQuery

    public HasValueQuery(String fieldName)

  Construct a `Query` implementation that scores nodes according to the supplied comparator.

  Parameters:
    `fieldName` - the name of the document field containing the value; may not be null

Method Detail

### clone

    public Object clone()

  Overrides:
    `clone` in class `org.apache.lucene.search.Query`
  See Also:
    `Query.clone()`

### createWeight

    public org.apache.lucene.search.Weight createWeight(org.apache.lucene.search.Searcher searcher)

  Overrides:
    `createWeight` in class `org.apache.lucene.search.Query`
  See Also:
    `Query.createWeight(org.apache.lucene.search.Searcher)`

### toString

    public String toString(String field)

  Specified by:
    `toString` in class `org.apache.lucene.search.Query`
  See Also:
    `Query.toString(java.lang.String)`

### hasValue

    protected boolean hasValue(org.apache.lucene.index.IndexReader reader,
                               int docId)
                        throws IOException

  Throws:
    `IOException`

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