1 package org.apache.lucene.analysis;
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 org.apache.lucene.document.Fieldable;
22 import java.io.Reader;
23 import java.io.IOException;
26 * This Analyzer limits the number of tokens while indexing. It is
27 * a replacement for the maximum field length setting inside {@link org.apache.lucene.index.IndexWriter}.
29 public final class LimitTokenCountAnalyzer extends Analyzer {
30 private final Analyzer delegate;
31 private final int maxTokenCount;
34 * Build an analyzer that limits the maximum number of tokens per field.
36 public LimitTokenCountAnalyzer(Analyzer delegate, int maxTokenCount) {
37 this.delegate = delegate;
38 this.maxTokenCount = maxTokenCount;
42 public TokenStream tokenStream(String fieldName, Reader reader) {
43 return new LimitTokenCountFilter(
44 delegate.tokenStream(fieldName, reader), maxTokenCount
49 public TokenStream reusableTokenStream(String fieldName, Reader reader) throws IOException {
50 return new LimitTokenCountFilter(
51 delegate.reusableTokenStream(fieldName, reader), maxTokenCount
56 public int getPositionIncrementGap(String fieldName) {
57 return delegate.getPositionIncrementGap(fieldName);
61 public int getOffsetGap(Fieldable field) {
62 return delegate.getOffsetGap(field);
66 public String toString() {
67 return "LimitTokenCountAnalyzer(" + delegate.toString() + ", maxTokenCount=" + maxTokenCount + ")";