org.apache.lucene.search

## Class CheckHits

- java.lang.Object
- - org.apache.lucene.search.CheckHits

-     public class CheckHits
      extends Object

  Utility class for asserting expected hits in tests.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `CheckHits.ExplanationAsserter` Asserts that the score explanation for every document matching a query corresponds with the true score.
    `static class` | `CheckHits.ExplanationAssertingSearcher` an IndexSearcher that implicitly checks hte explanation of every match whenever it executes a search.
    `static class` | `CheckHits.MatchesAsserter` Asserts that the `Matches` from a query is non-null whenever the document its created for is a hit.
    `static class` | `CheckHits.SetCollector` Just collects document ids into a set.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `CheckHits()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static void` | `checkDocIds(String mes, int[] results, ScoreDoc[] hits)` Tests that a Hits has an expected order of documents
    `static void` | `checkEqual(Query query, ScoreDoc[] hits1, ScoreDoc[] hits2)`
    `static void` | `checkExplanations(Query query, String defaultFieldName, IndexSearcher searcher)` Asserts that the explanation value for every document matching a query corresponds with the true score.
    `static void` | `checkExplanations(Query query, String defaultFieldName, IndexSearcher searcher, boolean deep)` Asserts that the explanation value for every document matching a query corresponds with the true score.
    `static void` | `checkHitCollector(Random random, Query query, String defaultFieldName, IndexSearcher searcher, int[] results)` Tests that a query matches the an expected set of documents using a HitCollector.
    `static void` | `checkHits(Random random, Query query, String defaultFieldName, IndexSearcher searcher, int[] results)` Tests that a query matches the an expected set of documents using Hits.
    `static void` | `checkHitsQuery(Query query, ScoreDoc[] hits1, ScoreDoc[] hits2, int[] results)` Tests that two queries have an expected order of documents, and that the two queries have the same score values.
    `static void` | `checkMatches(Query query, IndexSearcher searcher)` Asserts that the result of calling `Weight.matches(LeafReaderContext, int)` for every document matching a query returns a non-null `Matches`
    `static void` | `checkNoMatchExplanations(Query q, String defaultFieldName, IndexSearcher searcher, int[] results)` Tests that all documents up to maxDoc which are *not* in the expected result set, have an explanation which indicates that the document does not match
    `static void` | `checkTopScores(Random random, Query query, IndexSearcher searcher)`
    `static String` | `hits2str(ScoreDoc[] hits1, ScoreDoc[] hits2, int start, int end)`
    `static String` | `topdocsString(TopDocs docs, int start, int end)`
    `static void` | `verifyExplanation(String q, int doc, float score, boolean deep, Explanation expl)` Assert that an explanation has the expected score, and optionally that its sub-details max/sum/factor match to that score.

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

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### CheckHits

          public CheckHits()

  - ### Method Detail

    - #### checkNoMatchExplanations

          public static void checkNoMatchExplanations(Query q,
                                                      String defaultFieldName,
                                                      IndexSearcher searcher,
                                                      int[] results)
                                               throws IOException

      Tests that all documents up to maxDoc which are *not* in the expected result set, have an explanation which indicates that the document does not match
      Throws:
        `IOException`

    - #### checkHitCollector

          public static void checkHitCollector(Random random,
                                               Query query,
                                               String defaultFieldName,
                                               IndexSearcher searcher,
                                               int[] results)
                                        throws IOException

      Tests that a query matches the an expected set of documents using a HitCollector.

      Note that when using the HitCollector API, documents will be collected if they "match" regardless of what their score is.

      Parameters:
        `query` - the query to test
        `searcher` - the searcher to test the query against
        `defaultFieldName` - used for displaying the query in assertion messages
        `results` - a list of documentIds that must match the query
      Throws:
        `IOException`
      See Also:
        `checkHits(java.util.Random, org.apache.lucene.search.Query, java.lang.String, org.apache.lucene.search.IndexSearcher, int[])`

    - #### checkHits

          public static void checkHits(Random random,
                                       Query query,
                                       String defaultFieldName,
                                       IndexSearcher searcher,
                                       int[] results)
                                throws IOException

      Tests that a query matches the an expected set of documents using Hits.

      Note that when using the Hits API, documents will only be returned if they have a positive normalized score.

      Parameters:
        `query` - the query to test
        `searcher` - the searcher to test the query against
        `defaultFieldName` - used for displaing the query in assertion messages
        `results` - a list of documentIds that must match the query
      Throws:
        `IOException`
      See Also:
        `checkHitCollector(java.util.Random, org.apache.lucene.search.Query, java.lang.String, org.apache.lucene.search.IndexSearcher, int[])`

    - #### checkDocIds

          public static void checkDocIds(String mes,
                                         int[] results,
                                         ScoreDoc[] hits)

      Tests that a Hits has an expected order of documents

    - #### checkHitsQuery

          public static void checkHitsQuery(Query query,
                                            ScoreDoc[] hits1,
                                            ScoreDoc[] hits2,
                                            int[] results)

      Tests that two queries have an expected order of documents, and that the two queries have the same score values.

    - #### checkEqual

          public static void checkEqual(Query query,
                                        ScoreDoc[] hits1,
                                        ScoreDoc[] hits2)

    - #### hits2str

          public static String hits2str(ScoreDoc[] hits1,
                                        ScoreDoc[] hits2,
                                        int start,
                                        int end)

    - #### topdocsString

          public static String topdocsString(TopDocs docs,
                                             int start,
                                             int end)

    - #### checkExplanations

          public static void checkExplanations(Query query,
                                               String defaultFieldName,
                                               IndexSearcher searcher)
                                        throws IOException

      Asserts that the explanation value for every document matching a query corresponds with the true score.
      Parameters:
        `query` - the query to test
        `searcher` - the searcher to test the query against
        `defaultFieldName` - used for displaing the query in assertion messages
      Throws:
        `IOException`
      See Also:
        `CheckHits.ExplanationAsserter`, `for a "deep" testing of the explanation details.`

    - #### checkExplanations

          public static void checkExplanations(Query query,
                                               String defaultFieldName,
                                               IndexSearcher searcher,
                                               boolean deep)
                                        throws IOException

      Asserts that the explanation value for every document matching a query corresponds with the true score. Optionally does "deep" testing of the explanation details.
      Parameters:
        `query` - the query to test
        `searcher` - the searcher to test the query against
        `defaultFieldName` - used for displaing the query in assertion messages
        `deep` - indicates whether a deep comparison of sub-Explanation details should be executed
      Throws:
        `IOException`
      See Also:
        `CheckHits.ExplanationAsserter`

    - #### checkMatches

          public static void checkMatches(Query query,
                                          IndexSearcher searcher)
                                   throws IOException

      Asserts that the result of calling `Weight.matches(LeafReaderContext, int)` for every document matching a query returns a non-null `Matches`
      Parameters:
        `query` - the query to test
        `searcher` - the search to test against
      Throws:
        `IOException`

    - #### verifyExplanation

          public static void verifyExplanation(String q,
                                               int doc,
                                               float score,
                                               boolean deep,
                                               Explanation expl)

      Assert that an explanation has the expected score, and optionally that its sub-details max/sum/factor match to that score.
      Parameters:
        `q` - String representation of the query for assertion messages
        `doc` - Document ID for assertion messages
        `score` - Real score value of doc with query q
        `deep` - indicates whether a deep comparison of sub-Explanation details should be executed
        `expl` - The Explanation to match against score

    - #### checkTopScores

          public static void checkTopScores(Random random,
                                            Query query,
                                            IndexSearcher searcher)
                                     throws IOException

      Throws:
        `IOException`

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