| using Lucene.Net.Index; |
| using Lucene.Net.Queries.Function; |
| using Lucene.Net.Search; |
| using System; |
| using System.Collections; |
| using System.IO; |
| using System.Runtime.CompilerServices; |
| |
| namespace Lucene.Net.Expressions |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// A <see cref="Lucene.Net.Queries.Function.ValueSource"/> which uses the |
| /// <see cref="Lucene.Net.Search.Scorer"/> passed through |
| /// the context map by <see cref="ExpressionComparer"/>. |
| /// </summary> |
| internal class ScoreValueSource : ValueSource |
| { |
| /// <summary> |
| /// <paramref name="context"/> must contain a key "scorer" which is a |
| /// <see cref="Lucene.Net.Search.Scorer"/>. |
| /// </summary> |
| /// <exception cref="IOException"></exception> |
| public override FunctionValues GetValues(IDictionary context, AtomicReaderContext |
| readerContext) |
| { |
| Scorer v = (Scorer)context["scorer"]; |
| if (v == null) |
| { |
| throw new InvalidOperationException("Expressions referencing the score can only be used for sorting"); |
| } |
| return new ScoreFunctionValues(this, v); |
| } |
| |
| public override bool Equals(object o) |
| { |
| return o == this; |
| } |
| |
| public override int GetHashCode() |
| { |
| return RuntimeHelpers.GetHashCode(this); // LUCENENET NOTE: This is equivalent to System.identityHashCode(this) in Java |
| } |
| |
| public override string GetDescription() |
| { |
| return "score()"; |
| } |
| } |
| } |