org.apache.lucene.search

## Class PhraseQuery

- java.lang.Object
- - org.apache.lucene.search.Query
  - - org.apache.lucene.search.PhraseQuery

-     public class PhraseQuery
      extends Query

  A Query that matches documents containing a particular sequence of terms. A PhraseQuery is built by QueryParser for input like `"new york"`.

  This query may be combined with other terms or queries with a `BooleanQuery`.

  NOTE: All terms in the phrase must match, even those at the same position. If you have terms at the same position, perhaps synonyms, you probably want `MultiPhraseQuery` instead which only requires one term at a position to match.
  Also, Leading holes don't have any particular meaning for this query and will be ignored. For instance this query:

       PhraseQuery.Builder builder = new PhraseQuery.Builder();
       builder.add(new Term("body", "one"), 4);
       builder.add(new Term("body", "two"), 5);
       PhraseQuery pq = builder.build();

  is equivalent to the below query:

       PhraseQuery.Builder builder = new PhraseQuery.Builder();
       builder.add(new Term("body", "one"), 0);
       builder.add(new Term("body", "two"), 1);
       PhraseQuery pq = builder.build();

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `PhraseQuery.Builder` A builder for phrase queries.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PhraseQuery(int slop, String field, BytesRef... terms)` Create a phrase query which will match documents that contain the given list of terms at consecutive positions in `field`, and at a maximum edit distance of `slop`.
    `PhraseQuery(int slop, String field, String... terms)` Create a phrase query which will match documents that contain the given list of terms at consecutive positions in `field`, and at a maximum edit distance of `slop`.
    `PhraseQuery(String field, BytesRef... terms)` Create a phrase query which will match documents that contain the given list of terms at consecutive positions in `field`.
    `PhraseQuery(String field, String... terms)` Create a phrase query which will match documents that contain the given list of terms at consecutive positions in `field`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Weight` | `createWeight(IndexSearcher searcher, boolean needsScores, float boost)` Expert: Constructs an appropriate Weight implementation for this query.
    `boolean` | `equals(Object other)` Returns true iff `o` is equal to this.
    `int[]` | `getPositions()` Returns the relative positions of terms in this phrase.
    `int` | `getSlop()` Return the slop for this `PhraseQuery`.
    `Term[]` | `getTerms()` Returns the list of terms in this phrase.
    `int` | `hashCode()` Returns a hash code value for this object.
    `Query` | `rewrite(IndexReader reader)` Expert: called to re-write queries into primitive queries.
    `String` | `toString(String f)` Prints a user-readable version of this query.

    - ### 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`

- - ### Constructor Detail

    - #### PhraseQuery

          public PhraseQuery(int slop,
                             String field,
                             String... terms)

      Create a phrase query which will match documents that contain the given list of terms at consecutive positions in `field`, and at a maximum edit distance of `slop`. For more complicated use-cases, use `PhraseQuery.Builder`.
      See Also:
        `getSlop()`

    - #### PhraseQuery

          public PhraseQuery(String field,
                             String... terms)

      Create a phrase query which will match documents that contain the given list of terms at consecutive positions in `field`.

    - #### PhraseQuery

          public PhraseQuery(int slop,
                             String field,
                             BytesRef... terms)

      Create a phrase query which will match documents that contain the given list of terms at consecutive positions in `field`, and at a maximum edit distance of `slop`. For more complicated use-cases, use `PhraseQuery.Builder`.
      See Also:
        `getSlop()`

    - #### PhraseQuery

          public PhraseQuery(String field,
                             BytesRef... terms)

      Create a phrase query which will match documents that contain the given list of terms at consecutive positions in `field`.

  - ### Method Detail

    - #### getSlop

          public int getSlop()

      Return the slop for this `PhraseQuery`.

      The slop is an edit distance between respective positions of terms as defined in this `PhraseQuery` and the positions of terms in a document.

      For instance, when searching for `"quick fox"`, it is expected that the difference between the positions of `fox` and `quick` is 1. So `"a quick brown fox"` would be at an edit distance of 1 since the difference of the positions of `fox` and `quick` is 2. Similarly, `"the fox is quick"` would be at an edit distance of 3 since the difference of the positions of `fox` and `quick` is -2. The slop defines the maximum edit distance for a document to match.

      More exact matches are scored higher than sloppier matches, thus search results are sorted by exactness.

    - #### getTerms

          public Term[] getTerms()

      Returns the list of terms in this phrase.

    - #### getPositions

          public int[] getPositions()

      Returns the relative positions of terms in this phrase.

    - #### rewrite

          public Query rewrite(IndexReader reader)
                        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.
      Overrides:
        `rewrite` in class `Query`
      Throws:
        `IOException`

    - #### createWeight

          public Weight createWeight(IndexSearcher searcher,
                                     boolean needsScores,
                                     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`
        `needsScores` - True if document scores (`Scorer.score()`) are needed.
        `boost` - The boost that is propagated by the parent queries.
      Throws:
        `IOException`

    - #### toString

          public 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 iff `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)`

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