Package org.apache.lucene.search

# Class MultiPhraseQuery

java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.search.MultiPhraseQuery

public class MultiPhraseQuery extends Query
A generalized version of `PhraseQuery`, with the possibility of adding more than one term at the same position that are treated as a disjunction (OR). To use this class to search for the phrase "Microsoft app*" first create a Builder and use `MultiPhraseQuery.Builder.add(Term)` on the term "microsoft" (assuming lowercase analysis), then find all terms that have "app" as prefix using `LeafReader.terms(String)`, seeking to "app" then iterating and collecting terms until there is no longer that prefix, and finally use `MultiPhraseQuery.Builder.add(Term[])` to add them. `MultiPhraseQuery.Builder.build()` returns the fully constructed (and immutable) MultiPhraseQuery.

## Nested Class Summary

Nested Classes
Modifier and Type
Class
Description
`static class`
`MultiPhraseQuery.Builder`
A builder for multi-phrase queries
`static class`
`MultiPhraseQuery.UnionFullPostingsEnum`
Slower version of UnionPostingsEnum that delegates offsets and positions, for use by MatchesIterator
`static class`
`MultiPhraseQuery.UnionPostingsEnum`
Takes the logical union of multiple PostingsEnum iterators.

## Method Summary

Modifier and Type
Method
Description
`Weight`
`createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost)`
Expert: Constructs an appropriate Weight implementation for this query.
`boolean`
`equals(Object other)`
Returns true if `o` is equal to this.
`int[]`
`getPositions()`
Returns the relative positions of terms in this phrase.
`int`
`getSlop()`
Sets the phrase slop for this query.
`Term[][]`
`getTermArrays()`
Returns the arrays of arrays of terms in the multi-phrase.
`int`
`hashCode()`
Returns a hash code value for this object.
`Query`
`rewrite(IndexSearcher indexSearcher)`
Expert: called to re-write queries into primitive queries.
`final String`
`toString(String f)`
Prints a user-readable version of this query.
`void`
`visit(QueryVisitor visitor)`
Recurse through the query tree, visiting any child queries.

### Methods inherited from class org.apache.lucene.search.Query

`classHash, sameClassAs, toString`

### Methods inherited from class java.lang.Object

`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

## Method Details

### getSlop

public int getSlop()
Sets the phrase slop for this query.

See Also:
  - `PhraseQuery.getSlop()`

### getTermArrays

public Term[][] getTermArrays()
Returns the arrays of arrays of terms in the multi-phrase. Do not modify!

### getPositions

public int[] getPositions()
Returns the relative positions of terms in this phrase. Do not modify!

### rewrite

public Query rewrite(IndexSearcher indexSearcher) throws IOException
Description copied from class: `Query`
Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.

Callers are expected to call `rewrite` multiple times if necessary, until the rewritten query is the same as the original query.

The rewrite process may be able to make use of IndexSearcher's executor and be executed in parallel if the executor is provided.

Overrides:
  `rewrite` in class `Query`
Throws:
  `IOException`
See Also:
  - `IndexSearcher.rewrite(Query)`

### visit

public void visit(QueryVisitor visitor)
Description copied from class: `Query`
Recurse through the query tree, visiting any child queries.

Specified by:
  `visit` in class `Query`
Parameters:
  `visitor` - a QueryVisitor to be called by each query in the tree

### createWeight

public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException
Description copied from class: `Query`
Expert: Constructs an appropriate Weight implementation for this query.

Only implemented by primitive queries, which re-write to themselves.

Overrides:
  `createWeight` in class `Query`
Parameters:
  `scoreMode` - How the produced scorers will be consumed.
  `boost` - The boost that is propagated by the parent queries.
Throws:
  `IOException`

### toString

public final String toString(String f)
Prints a user-readable version of this query.

Specified by:
  `toString` in class `Query`

### equals

public boolean equals(Object other)
Returns true if `o` is equal to this.

Specified by:
  `equals` in class `Query`
See Also:
  - `Query.sameClassAs(Object)`
  - `Query.classHash()`

### hashCode

public int hashCode()
Returns a hash code value for this object.

Specified by:
  `hashCode` in class `Query`
See Also:
  - `Query.equals(Object)`