package org.apache.lucene.search.highlight;

/**
 * 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 java.io.StringReader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.MockTokenizer;
import org.apache.lucene.analysis.WhitespaceAnalyzer;

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.util.Version;

public class OffsetLimitTokenFilterTest extends BaseTokenStreamTestCase {
  
  public void testFilter() throws Exception {
    // we disable MockTokenizer checks because we will forcefully limit the 
    // tokenstream and call end() before incrementToken() returns false.
    MockTokenizer stream = new MockTokenizer(new StringReader(
        "short toolong evenmuchlongertext a ab toolong foo"),
        MockTokenizer.WHITESPACE, false);
    stream.setEnableChecks(false);
    OffsetLimitTokenFilter filter = new OffsetLimitTokenFilter(stream, 10);
    assertTokenStreamContents(filter, new String[] {"short", "toolong"});
    
    stream = new MockTokenizer(new StringReader(
    "short toolong evenmuchlongertext a ab toolong foo"),
    MockTokenizer.WHITESPACE, false);
    stream.setEnableChecks(false);
    filter = new OffsetLimitTokenFilter(stream, 12);
    assertTokenStreamContents(filter, new String[] {"short", "toolong"});
  
    stream = new MockTokenizer(new StringReader(
    "short toolong evenmuchlongertext a ab toolong foo"),
    MockTokenizer.WHITESPACE, false);
    stream.setEnableChecks(false);
    filter = new OffsetLimitTokenFilter(stream, 30);
    assertTokenStreamContents(filter, new String[] {"short", "toolong",
        "evenmuchlongertext"});
    
    // TODO: This is not actually testing reuse! (reusableTokenStream is not implemented)
    checkOneTermReuse(new Analyzer() {
      
      @Override
      public TokenStream tokenStream(String fieldName, Reader reader) {
        MockTokenizer tokenizer = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
        tokenizer.setEnableChecks(false);
        return new OffsetLimitTokenFilter(tokenizer, 10);
      }
    }, "llenges", "llenges");
  }
}