package org.apache.lucene.queryParser;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.search.Query;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.LowerCaseFilter;
import org.apache.lucene.analysis.Token;
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 or that return tokens with a position
* increment > 1.
*
* @author Daniel Naber
*/
public class TestMultiAnalyzer extends TestCase {
private static int multiToken = 0;
public void testMultiAnalyzer() throws ParseException {
QueryParser qp = new QueryParser("", new MultiAnalyzer());
// trivial, no multiple tokens:
assertEquals("foo", qp.parse("foo").toString());
assertEquals("foo", qp.parse("\"foo\"").toString());
assertEquals("foo foobar", qp.parse("foo foobar").toString());
assertEquals("\"foo foobar\"", qp.parse("\"foo foobar\"").toString());
assertEquals("\"foo foobar blah\"", qp.parse("\"foo foobar blah\"").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());
// phrase after changing default slop
qp.setPhraseSlop(99);
assertEquals("\"(multi multi2) foo\"~99 bar",
qp.parse("\"multi foo\" bar").toString());
assertEquals("\"(multi multi2) foo\"~99 \"foo bar\"~2",
qp.parse("\"multi foo\" \"foo bar\"~2").toString());
qp.setPhraseSlop(0);
// non-default operator:
qp.setDefaultOperator(QueryParser.AND_OPERATOR);
assertEquals("+(multi multi2) +foo", qp.parse("multi foo").toString());
}
public void testMultiAnalyzerWithSubclassOfQueryParser() throws ParseException {
DumbQueryParser qp = new DumbQueryParser("", new MultiAnalyzer());
qp.setPhraseSlop(99); // modified default slop
// direct call to (super's) getFieldQuery to demonstrate differnce
// between phrase and multiphrase with modified default slop
assertEquals("\"foo bar\"~99",
qp.getSuperFieldQuery("","foo bar").toString());
assertEquals("\"(multi multi2) bar\"~99",
qp.getSuperFieldQuery("","multi bar").toString());
// ask sublcass to parse phrase with modified default slop
assertEquals("\"(multi multi2) foo\"~99 bar",
qp.parse("\"multi foo\" bar").toString());
}
public void testPosIncrementAnalyzer() throws ParseException {
QueryParser qp = new QueryParser("", new PosIncrementAnalyzer());
assertEquals("quick brown", qp.parse("the quick brown").toString());
assertEquals("\"quick brown\"", qp.parse("\"the quick brown\"").toString());
assertEquals("quick brown fox", qp.parse("the quick brown fox").toString());
assertEquals("\"quick brown fox\"", qp.parse("\"the quick brown fox\"").toString());
}
/**
* Expands "multi" to "multi" and "multi2", both at the same position,
* and expands "triplemulti" to "triplemulti", "multi3", and "multi2".
*/
private class MultiAnalyzer extends Analyzer {
public MultiAnalyzer() {
}
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;
}
}
}
}
/**
* Analyzes "the quick brown" as: quick(incr=2) brown(incr=1).
* Does not work correctly for input other than "the quick brown ...".
*/
private class PosIncrementAnalyzer extends Analyzer {
public PosIncrementAnalyzer() {
}
public TokenStream tokenStream(String fieldName, Reader reader) {
TokenStream result = new StandardTokenizer(reader);
result = new TestPosIncrementFilter(result);
result = new LowerCaseFilter(result);
return result;
}
}
private final class TestPosIncrementFilter extends TokenFilter {
public TestPosIncrementFilter(TokenStream in) {
super(in);
}
public final org.apache.lucene.analysis.Token next() throws java.io.IOException {
for (Token t = input.next(); t != null; t = input.next()) {
if (t.termText().equals("the")) {
// stopword, do nothing
} else if (t.termText().equals("quick")) {
org.apache.lucene.analysis.Token token =
new org.apache.lucene.analysis.Token(t.termText(), t.startOffset(),
t.endOffset(), t.type());
token.setPositionIncrement(2);
return token;
} else {
org.apache.lucene.analysis.Token token =
new org.apache.lucene.analysis.Token(t.termText(), t.startOffset(),
t.endOffset(), t.type());
token.setPositionIncrement(1);
return token;
}
}
return null;
}
}
/** a very simple subclass of QueryParser */
private final static class DumbQueryParser extends QueryParser {
public DumbQueryParser(String f, Analyzer a) {
super(f, a);
}
/** expose super's version */
public Query getSuperFieldQuery(String f, String t)
throws ParseException {
return super.getFieldQuery(f,t);
}
/** wrap super's version */
protected Query getFieldQuery(String f, String t)
throws ParseException {
return new DumbQueryWrapper(getSuperFieldQuery(f,t));
}
}
/**
* A very simple wrapper to prevent instanceof checks but uses
* the toString of the query it wraps.
*/
private final static class DumbQueryWrapper extends Query {
private Query q;
public DumbQueryWrapper(Query q) {
super();
this.q = q;
}
public String toString(String f) {
return q.toString(f);
}
}
}
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