/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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;
namespace Lucene.Net.Search{
/// <summary>A scorer that matches no document at all. </summary>
class NonMatchingScorer : Scorer
{
public NonMatchingScorer() : base(null)
{
} // no similarity used
public override int Doc()
{
throw new System.NotSupportedException();
}
public override bool Next()
{
return false;
}
public override float Score()
{
throw new System.NotSupportedException();
}
public override bool SkipTo(int target)
{
return false;
}
public override Explanation Explain(int doc)
{
Explanation e = new Explanation();
e.SetDescription("No document matches.");
return e;
}
}
}
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