package org.apache.lucene.search;
/**
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.analysis.SimpleAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import junit.framework.TestCase;
import java.io.IOException;
/**
* TestWildcard tests the '*' and '?' wildard characters.
*
* @author Otis Gospodnetic
*/
public class TestWildcard
extends TestCase
{
/**
* Creates a new <code>TestWildcard</code> instance.
*
* @param name the name of the test
*/
public TestWildcard(String name)
{
super(name);
}
/**
* Tests Wildcard queries with an asterisk.
*
*/
public void testAsterisk()
throws IOException
{
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, false, false);
BooleanQuery query7 = new BooleanQuery();
query7.add(query3, false, false);
query7.add(query5, false, false);
// 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);
}
/**
* Tests Wildcard queries with a question mark.
*
* @exception IOException if an error occurs
*/
public void testQuestionmark()
throws IOException
{
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"));
assertMatches(searcher, query1, 1);
assertMatches(searcher, query2, 2);
assertMatches(searcher, query3, 1);
assertMatches(searcher, query4, 3);
assertMatches(searcher, query5, 0);
}
private RAMDirectory getIndexStore(String field, String[] contents)
throws IOException
{
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(Field.Text(field, contents[i]));
writer.addDocument(doc);
}
writer.optimize();
writer.close();
return indexStore;
}
private void assertMatches(IndexSearcher searcher, Query q, int expectedMatches)
throws IOException
{
Hits result = searcher.search(q);
assertEquals(expectedMatches, result.length());
}
}
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