1 package org.apache.lucene.search.highlight;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
20 import java.io.IOException;
22 import org.apache.lucene.analysis.TokenFilter;
23 import org.apache.lucene.analysis.TokenStream;
24 import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
27 * This TokenFilter limits the number of tokens while indexing by adding up the
30 public final class OffsetLimitTokenFilter extends TokenFilter {
32 private int offsetCount;
33 private OffsetAttribute offsetAttrib = getAttribute(OffsetAttribute.class);
34 private int offsetLimit;
36 public OffsetLimitTokenFilter(TokenStream input, int offsetLimit) {
38 this.offsetLimit = offsetLimit;
42 public boolean incrementToken() throws IOException {
43 if (offsetCount < offsetLimit && input.incrementToken()) {
44 int offsetLength = offsetAttrib.endOffset() - offsetAttrib.startOffset();
45 offsetCount += offsetLength;
52 public void reset() throws IOException {