/*
* 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.Diagnostics;
using Lucene.Net.Analysis.Tokenattributes;
using Attribute = Lucene.Net.Util.Attribute;
namespace Lucene.Net.Analysis.Miscellaneous
{
///
/// A TokenStream containing a single token.
///
public sealed class SingleTokenTokenStream : TokenStream
{
private bool _exhausted;
// The token needs to be immutable, so work with clones!
private Token _singleToken;
private readonly Attribute _tokenAtt;
public SingleTokenTokenStream(Token token)
: base(Token.TOKEN_ATTRIBUTE_FACTORY)
{
Debug.Assert(token != null, "Token was null!");
_singleToken = (Token) token.Clone();
_tokenAtt = (Attribute)AddAttribute();
Debug.Assert(_tokenAtt is Token);
}
public override sealed bool IncrementToken()
{
if (_exhausted)
return false;
ClearAttributes();
_singleToken.CopyTo(_tokenAtt);
_exhausted = true;
return true;
}
public override void Reset()
{
_exhausted = false;
}
protected override void Dispose(bool disposing)
{
// Do nothing
}
public Token GetToken()
{
return (Token) _singleToken.Clone();
}
public void SetToken(Token token)
{
_singleToken = (Token) token.Clone();
}
}
}