/* * 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 { /// A scorer that matches no document at all. 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; } } }