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/*
* 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 Attribute = Lucene.Net.Util.Attribute;
namespace Lucene.Net.Analysis.Tokenattributes
{
/// <summary> The start and end character offset of a Token. </summary>
[Serializable]
public class OffsetAttribute:Attribute, IOffsetAttribute, System.ICloneable
{
private int startOffset;
private int endOffset;
/// <summary>Returns this Token's starting offset, the position of the first character
/// corresponding to this token in the source text.
/// Note that the difference between endOffset() and startOffset() may not be
/// equal to termText.length(), as the term text may have been altered by a
/// stemmer or some other filter.
/// </summary>
public virtual int StartOffset
{
get { return startOffset; }
}
/// <summary>Set the starting and ending offset.
/// See StartOffset() and EndOffset()
/// </summary>
public virtual void SetOffset(int startOffset, int endOffset)
{
this.startOffset = startOffset;
this.endOffset = endOffset;
}
/// <summary>Returns this Token's ending offset, one greater than the position of the
/// last character corresponding to this token in the source text. The length
/// of the token in the source text is (endOffset - startOffset).
/// </summary>
public virtual int EndOffset
{
get { return endOffset; }
}
public override void Clear()
{
startOffset = 0;
endOffset = 0;
}
public override bool Equals(System.Object other)
{
if (other == this)
{
return true;
}
if (other is OffsetAttribute)
{
OffsetAttribute o = (OffsetAttribute) other;
return o.startOffset == startOffset && o.endOffset == endOffset;
}
return false;
}
public override int GetHashCode()
{
int code = startOffset;
code = code * 31 + endOffset;
return code;
}
public override void CopyTo(Attribute target)
{
IOffsetAttribute t = (IOffsetAttribute) target;
t.SetOffset(startOffset, endOffset);
}
override public System.Object Clone()
{
OffsetAttribute impl = new OffsetAttribute();
impl.endOffset = endOffset;
impl.startOffset = startOffset;
return impl;
}
}
}
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