/*
* 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.
*/
using System;
using Lucene.Net.Analysis;
using Lucene.Net.Analysis.Tokenattributes;
namespace Lucene.Net.Search.Highlight
{
/// implementation which breaks text up into same-size
/// fragments with no concerns over spotting sentence boundaries.
///
/// mark@searcharea.co.uk
///
public class SimpleFragmenter : IFragmenter
{
private static int DEFAULT_FRAGMENT_SIZE = 100;
private int currentNumFrags;
private int fragmentSize;
private IOffsetAttribute 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)
*/
public void Start(String originalText, TokenStream stream)
{
offsetAtt = stream.AddAttribute();
currentNumFrags = 1;
}
/* (non-Javadoc)
* @see org.apache.lucene.search.highlight.Fragmenter#isNewFragment()
*/
public bool IsNewFragment()
{
bool isNewFrag = offsetAtt.EndOffset >= (fragmentSize*currentNumFrags);
if (isNewFrag)
{
currentNumFrags++;
}
return isNewFrag;
}
///
/// Gets or sets the size in number of characters of each fragment
///
public int FragmentSize
{
get { return fragmentSize; }
set { fragmentSize = value; }
}
}
}