/**
* 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.
*/
package org.apache.solr.analysis;
import org.apache.lucene.analysis.Token;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.WhitespaceTokenizer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import java.io.IOException;
import java.io.StringReader;
/**
* Test that BufferedTokenStream behaves as advertised in subclasses.
*/
public class TestBufferedTokenStream extends BaseTokenTestCase {
/** Example of a class implementing the rule "A" "B" => "Q" "B" */
public static class AB_Q_Stream extends BufferedTokenStream {
public AB_Q_Stream(TokenStream input) {super(input);}
@Override
protected Token process(Token t) throws IOException {
if ("A".equals(new String(t.buffer(), 0, t.length()))) {
Token t2 = read();
if (t2!=null && "B".equals(new String(t2.buffer(), 0, t2.length()))) t.setEmpty().append("Q");
if (t2!=null) pushBack(t2);
}
return t;
}
}
/** Example of a class implementing "A" "B" => "A" "A" "B" */
public static class AB_AAB_Stream extends BufferedTokenStream {
public AB_AAB_Stream(TokenStream input) {super(input);}
@Override
protected Token process(Token t) throws IOException {
if ("A".equals(new String(t.buffer(), 0, t.length())) &&
"B".equals(new String(peek(1).buffer(), 0, peek(1).length())))
write((Token)t.clone());
return t;
}
}
public void testABQ() throws Exception {
final String input = "How now A B brown A cow B like A B thing?";
final String expected = "How now Q B brown A cow B like Q B thing?";
TokenStream ts = new AB_Q_Stream
(new WhitespaceTokenizer(DEFAULT_VERSION, new StringReader(input)));
assertTokenStreamContents(ts, expected.split("\\s"));
}
public void testABAAB() throws Exception {
final String input = "How now A B brown A cow B like A B thing?";
final String expected = "How now A A B brown A cow B like A A B thing?";
TokenStream ts = new AB_AAB_Stream
(new WhitespaceTokenizer(DEFAULT_VERSION, new StringReader(input)));
assertTokenStreamContents(ts, expected.split("\\s"));
}
public void testReset() throws Exception {
final String input = "How now A B brown A cow B like A B thing?";
Tokenizer tokenizer = new WhitespaceTokenizer(DEFAULT_VERSION, new StringReader(input));
TokenStream ts = new AB_AAB_Stream(tokenizer);
CharTermAttribute term = ts.addAttribute(CharTermAttribute.class);
assertTrue(ts.incrementToken());
assertEquals("How", term.toString());
assertTrue(ts.incrementToken());
assertEquals("now", term.toString());
assertTrue(ts.incrementToken());
assertEquals("A", term.toString());
// reset back to input,
// if reset() does not work correctly then previous buffered tokens will remain
tokenizer.reset(new StringReader(input));
ts.reset();
assertTrue(ts.incrementToken());
assertEquals("How", term.toString());
}
}