| using Lucene.Net.Index; |
| using Lucene.Net.Queries.Function; |
| using Spatial4n.Core.Context; |
| using Spatial4n.Core.Distance; |
| using Spatial4n.Core.Shapes; |
| using System; |
| using System.Collections; |
| |
| namespace Lucene.Net.Spatial.Util |
| { |
| /* |
| * 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> |
| /// An implementation of the Lucene ValueSource that returns the spatial distance |
| /// between an input point and a document's points in |
| /// <see cref="ShapeFieldCacheProvider{T}"/>. The shortest distance is returned if a |
| /// document has more than one point. |
| /// |
| /// @lucene.internal |
| /// </summary> |
| public class ShapeFieldCacheDistanceValueSource : ValueSource |
| { |
| private readonly SpatialContext ctx; |
| private readonly IPoint from; |
| private readonly ShapeFieldCacheProvider<IPoint> provider; |
| private readonly double multiplier; |
| |
| public ShapeFieldCacheDistanceValueSource(SpatialContext ctx, |
| ShapeFieldCacheProvider<IPoint> provider, IPoint from, double multiplier) |
| { |
| this.ctx = ctx; |
| this.from = from; |
| this.provider = provider; |
| this.multiplier = multiplier; |
| } |
| |
| public override string GetDescription() |
| { |
| return GetType().Name + "(" + provider + ", " + from + ")"; |
| } |
| |
| public override FunctionValues GetValues(IDictionary context, AtomicReaderContext readerContext) |
| { |
| return new CachedDistanceFunctionValue(readerContext.AtomicReader, this); |
| } |
| |
| internal class CachedDistanceFunctionValue : FunctionValues |
| { |
| private readonly ShapeFieldCacheDistanceValueSource enclosingInstance; |
| private readonly ShapeFieldCache<IPoint> cache; |
| private readonly IPoint from; |
| private readonly IDistanceCalculator calculator; |
| private readonly double nullValue; |
| |
| public CachedDistanceFunctionValue(AtomicReader reader, ShapeFieldCacheDistanceValueSource enclosingInstance) |
| { |
| cache = enclosingInstance.provider.GetCache(reader); |
| this.enclosingInstance = enclosingInstance; |
| |
| from = enclosingInstance.from; |
| calculator = enclosingInstance.ctx.DistCalc; |
| nullValue = (enclosingInstance.ctx.IsGeo ? 180 * enclosingInstance.multiplier : double.MaxValue); |
| } |
| |
| /// <summary> |
| /// NOTE: This was floatVal() in Lucene |
| /// </summary> |
| public override float SingleVal(int doc) |
| { |
| return (float)DoubleVal(doc); |
| } |
| |
| public override double DoubleVal(int doc) |
| { |
| var vals = cache.GetShapes(doc); |
| if (vals != null) |
| { |
| double v = calculator.Distance(from, vals[0]); |
| for (int i = 1; i < vals.Count; i++) |
| { |
| v = Math.Min(v, calculator.Distance(from, vals[i])); |
| } |
| return v * enclosingInstance.multiplier; |
| } |
| return nullValue; |
| } |
| |
| public override string ToString(int doc) |
| { |
| return enclosingInstance.GetDescription() + "=" + SingleVal(doc); |
| } |
| } |
| |
| public override bool Equals(object o) |
| { |
| if (this == o) return true; |
| if (o is null || GetType() != o.GetType()) return false; |
| |
| |
| if (!(o is ShapeFieldCacheDistanceValueSource that)) return false; |
| if (!ctx.Equals(that.ctx)) return false; |
| if (!from.Equals(that.from)) return false; |
| if (!provider.Equals(that.provider)) return false; |
| if (multiplier != that.multiplier) return false; |
| |
| return true; |
| } |
| |
| public override int GetHashCode() |
| { |
| return from.GetHashCode(); |
| } |
| } |
| } |