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From dna...@apache.org
Subject cvs commit: jakarta-lucene/src/test/org/apache/lucene/queryParser TestMultiAnalyzer.java
Date Sat, 13 Nov 2004 15:16:11 GMT
dnaber      2004/11/13 07:16:11

  Added:       src/test/org/apache/lucene/queryParser
                        TestMultiAnalyzer.java
  Log:
  test QueryParser's ability to be used with Analyzers that return more than one token per
position
  
  Revision  Changes    Path
  1.1                  jakarta-lucene/src/test/org/apache/lucene/queryParser/TestMultiAnalyzer.java
  
  Index: TestMultiAnalyzer.java
  ===================================================================
  package org.apache.lucene.queryParser;
  
  /**
   * 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 java.io.Reader;
  
  import junit.framework.TestCase;
  
  import org.apache.lucene.analysis.Analyzer;
  import org.apache.lucene.analysis.LowerCaseFilter;
  import org.apache.lucene.analysis.TokenFilter;
  import org.apache.lucene.analysis.TokenStream;
  import org.apache.lucene.analysis.standard.StandardTokenizer;
  
  /**
   * Test QueryParser's ability to deal with Analyzers that return more
   * than one token per position.
   * 
   * @author Daniel Naber
   */
  public class TestMultiAnalyzer extends TestCase {
  
    private static int multiToken = 0;
  
    public void testAnalyzer() throws ParseException {
      
      QueryParser qp = new QueryParser("", new TestAnalyzer());
  
      // trivial, no multiple tokens:
      assertEquals("foo", qp.parse("foo").toString());
      assertEquals("foo foobar", qp.parse("foo foobar").toString());
  
      // two tokens at the same position:
      assertEquals("(multi multi2) foo", qp.parse("multi foo").toString());
      assertEquals("foo (multi multi2)", qp.parse("foo multi").toString());
      assertEquals("(multi multi2) (multi multi2)", qp.parse("multi multi").toString());
      assertEquals("+(foo (multi multi2)) +(bar (multi multi2))",
          qp.parse("+(foo multi) +(bar multi)").toString());
      assertEquals("+(foo (multi multi2)) field:\"bar (multi multi2)\"",
          qp.parse("+(foo multi) field:\"bar multi\"").toString());
  
      // phrases:
      assertEquals("\"(multi multi2) foo\"", qp.parse("\"multi foo\"").toString());
      assertEquals("\"foo (multi multi2)\"", qp.parse("\"foo multi\"").toString());
      assertEquals("\"foo (multi multi2) foobar (multi multi2)\"",
          qp.parse("\"foo multi foobar multi\"").toString());
  
      // fields:
      assertEquals("(field:multi field:multi2) field:foo", qp.parse("field:multi field:foo").toString());
      assertEquals("field:\"(multi multi2) foo\"", qp.parse("field:\"multi foo\"").toString());
  
      // three tokens at one position:
      assertEquals("triplemulti multi3 multi2", qp.parse("triplemulti").toString());
      assertEquals("foo (triplemulti multi3 multi2) foobar",
          qp.parse("foo triplemulti foobar").toString());
  
      // phrase with non-default slop:
      assertEquals("\"(multi multi2) foo\"~10", qp.parse("\"multi foo\"~10").toString());
  
      // phrase with non-default boost:
      assertEquals("\"(multi multi2) foo\"^2.0", qp.parse("\"multi foo\"^2").toString());
  
      // non-default operator:
      qp.setOperator(QueryParser.DEFAULT_OPERATOR_AND);
      assertEquals("+(multi multi2) +foo", qp.parse("multi foo").toString());
  
    }
    
    /**
     * Expands "multi" to "multi" and "multi2", both at the same position,
     * and expands "triplemulti" to "triplemulti", "multi3", and "multi2".  
     */
    private class TestAnalyzer extends Analyzer {
  
      public TestAnalyzer() {
      }
  
      public TokenStream tokenStream(String fieldName, Reader reader) {
        TokenStream result = new StandardTokenizer(reader);
        result = new TestFilter(result);
        result = new LowerCaseFilter(result);
        return result;
      }
    }
  
    private final class TestFilter extends TokenFilter {
      
      private org.apache.lucene.analysis.Token prevToken;
      
      public TestFilter(TokenStream in) {
        super(in);
      }
  
      public final org.apache.lucene.analysis.Token next() throws java.io.IOException {
        if (multiToken > 0) {
          org.apache.lucene.analysis.Token token = 
            new org.apache.lucene.analysis.Token("multi"+(multiToken+1), prevToken.startOffset(),
            prevToken.endOffset(), prevToken.type());
          token.setPositionIncrement(0);
          multiToken--;
          return token;
        } else {
          org.apache.lucene.analysis.Token t = input.next();
          prevToken = t;
          if (t == null)
            return null;
          String text = t.termText();
          if (text.equals("triplemulti")) {
            multiToken = 2;
            return t;
          } else if (text.equals("multi")) {
            multiToken = 1;
            return t;
          } else {
            return t;
          }
        }
      }
    }
  
  }
  
  

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