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TestWildcard.javaAPI DocApache Lucene 2.1.05749Wed Feb 14 10:46:36 GMT 2007org.apache.lucene.search

TestWildcard

public class TestWildcard extends TestCase
TestWildcard tests the '*' and '?' wildcard characters.
version
$Id: TestWildcard.java 477424 2006-11-21 00:09:50Z ehatcher $
author
Otis Gospodnetic

Fields Summary
Constructors Summary
Methods Summary
private voidassertMatches(org.apache.lucene.search.IndexSearcher searcher, org.apache.lucene.search.Query q, int expectedMatches)

    Hits result = searcher.search(q);
    assertEquals(expectedMatches, result.length());
private org.apache.lucene.store.RAMDirectorygetIndexStore(java.lang.String field, java.lang.String[] contents)

    RAMDirectory indexStore = new RAMDirectory();
    IndexWriter writer = new IndexWriter(indexStore, new SimpleAnalyzer(), true);
    for (int i = 0; i < contents.length; ++i) {
      Document doc = new Document();
      doc.add(new Field(field, contents[i], Field.Store.YES, Field.Index.TOKENIZED));
      writer.addDocument(doc);
    }
    writer.optimize();
    writer.close();

    return indexStore;
public voidtestAsterisk()
Tests Wildcard queries with an asterisk.

    RAMDirectory indexStore = getIndexStore("body", new String[]
    {"metal", "metals"});
    IndexSearcher searcher = new IndexSearcher(indexStore);
    Query query1 = new TermQuery(new Term("body", "metal"));
    Query query2 = new WildcardQuery(new Term("body", "metal*"));
    Query query3 = new WildcardQuery(new Term("body", "m*tal"));
    Query query4 = new WildcardQuery(new Term("body", "m*tal*"));
    Query query5 = new WildcardQuery(new Term("body", "m*tals"));

    BooleanQuery query6 = new BooleanQuery();
    query6.add(query5, BooleanClause.Occur.SHOULD);

    BooleanQuery query7 = new BooleanQuery();
    query7.add(query3, BooleanClause.Occur.SHOULD);
    query7.add(query5, BooleanClause.Occur.SHOULD);

    // Queries do not automatically lower-case search terms:
    Query query8 = new WildcardQuery(new Term("body", "M*tal*"));

    assertMatches(searcher, query1, 1);
    assertMatches(searcher, query2, 2);
    assertMatches(searcher, query3, 1);
    assertMatches(searcher, query4, 2);
    assertMatches(searcher, query5, 1);
    assertMatches(searcher, query6, 1);
    assertMatches(searcher, query7, 2);
    assertMatches(searcher, query8, 0);
    assertMatches(searcher, new WildcardQuery(new Term("body", "*tall")), 0);
    assertMatches(searcher, new WildcardQuery(new Term("body", "*tal")), 1);
    assertMatches(searcher, new WildcardQuery(new Term("body", "*tal*")), 2);
public voidtestEquals()

    WildcardQuery wq1 = new WildcardQuery(new Term("field", "b*a"));
    WildcardQuery wq2 = new WildcardQuery(new Term("field", "b*a"));
    WildcardQuery wq3 = new WildcardQuery(new Term("field", "b*a"));

    // reflexive?
    assertEquals(wq1, wq2);
    assertEquals(wq2, wq1);

    // transitive?
    assertEquals(wq2, wq3);
    assertEquals(wq1, wq3);

    assertFalse(wq1.equals(null));

    FuzzyQuery fq = new FuzzyQuery(new Term("field", "b*a"));
    assertFalse(wq1.equals(fq));
    assertFalse(fq.equals(wq1));
public voidtestQuestionmark()
Tests Wildcard queries with a question mark.

throws
IOException if an error occurs

    RAMDirectory indexStore = getIndexStore("body", new String[]
    {"metal", "metals", "mXtals", "mXtXls"});
    IndexSearcher searcher = new IndexSearcher(indexStore);
    Query query1 = new WildcardQuery(new Term("body", "m?tal"));
    Query query2 = new WildcardQuery(new Term("body", "metal?"));
    Query query3 = new WildcardQuery(new Term("body", "metals?"));
    Query query4 = new WildcardQuery(new Term("body", "m?t?ls"));
    Query query5 = new WildcardQuery(new Term("body", "M?t?ls"));
    Query query6 = new WildcardQuery(new Term("body", "meta??"));
    
    assertMatches(searcher, query1, 1); 
    assertMatches(searcher, query2, 1);
    assertMatches(searcher, query3, 0);
    assertMatches(searcher, query4, 3);
    assertMatches(searcher, query5, 0);
    assertMatches(searcher, query6, 1); // Query: 'meta??' matches 'metals' not 'metal'
public voidtestTermWithoutWildcard()
Tests if a WildcardQuery that has no wildcard in the term is rewritten to a single TermQuery.

      RAMDirectory indexStore = getIndexStore("field", new String[]{"nowildcard", "nowildcardx"});
      IndexSearcher searcher = new IndexSearcher(indexStore);

      Query wq = new WildcardQuery(new Term("field", "nowildcard"));
      assertMatches(searcher, wq, 1);

      wq = searcher.rewrite(wq);
      assertTrue(wq instanceof TermQuery);