| /* |
| * 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.lucene.search.highlight; |
| |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.tokenattributes.OffsetAttribute; |
| |
| /** |
| * {@link Fragmenter} implementation which breaks text up into same-size |
| * fragments with no concerns over spotting sentence boundaries. |
| */ |
| public class SimpleFragmenter implements Fragmenter { |
| private static final int DEFAULT_FRAGMENT_SIZE = 100; |
| private int currentNumFrags; |
| private int fragmentSize; |
| private OffsetAttribute offsetAtt; |
| |
| public SimpleFragmenter() { |
| this(DEFAULT_FRAGMENT_SIZE); |
| } |
| |
| /** |
| * |
| * @param fragmentSize size in number of characters of each fragment |
| */ |
| public SimpleFragmenter(int fragmentSize) { |
| this.fragmentSize = fragmentSize; |
| } |
| |
| |
| /* (non-Javadoc) |
| * @see org.apache.lucene.search.highlight.Fragmenter#start(java.lang.String, org.apache.lucene.analysis.TokenStream) |
| */ |
| @Override |
| public void start(String originalText, TokenStream stream) { |
| offsetAtt = stream.addAttribute(OffsetAttribute.class); |
| currentNumFrags = 1; |
| } |
| |
| |
| /* (non-Javadoc) |
| * @see org.apache.lucene.search.highlight.Fragmenter#isNewFragment() |
| */ |
| @Override |
| public boolean isNewFragment() { |
| boolean isNewFrag = offsetAtt.endOffset() >= (fragmentSize * currentNumFrags); |
| if (isNewFrag) { |
| currentNumFrags++; |
| } |
| return isNewFrag; |
| } |
| |
| /** |
| * @return size in number of characters of each fragment |
| */ |
| public int getFragmentSize() { |
| return fragmentSize; |
| } |
| |
| /** |
| * @param size size in characters of each fragment |
| */ |
| public void setFragmentSize(int size) { |
| fragmentSize = size; |
| } |
| |
| } |