| using Lucene.Net.Index; |
| using Lucene.Net.Queries.Function; |
| using System.Collections; |
| using System.Collections.Generic; |
| using JCG = J2N.Collections.Generic; |
| |
| 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> |
| /// Caches the doubleVal of another value source in a HashMap |
| /// so that it is computed only once. |
| /// @lucene.internal |
| /// </summary> |
| public class CachingDoubleValueSource : ValueSource |
| { |
| protected readonly ValueSource m_source; |
| protected readonly IDictionary<int, double> m_cache; |
| |
| public CachingDoubleValueSource(ValueSource source) |
| { |
| this.m_source = source; |
| m_cache = new JCG.Dictionary<int, double>(); |
| } |
| |
| public override string GetDescription() |
| { |
| return "Cached[" + m_source.GetDescription() + "]"; |
| } |
| |
| public override FunctionValues GetValues(IDictionary context, AtomicReaderContext readerContext) |
| { |
| int @base = readerContext.DocBase; |
| FunctionValues vals = m_source.GetValues(context, readerContext); |
| return new CachingDoubleFunctionValue(@base, vals, m_cache); |
| } |
| |
| #region Nested type: CachingDoubleFunctionValue |
| |
| internal class CachingDoubleFunctionValue : FunctionValues |
| { |
| private readonly IDictionary<int, double> cache; |
| private readonly int docBase; |
| private readonly FunctionValues values; |
| |
| public CachingDoubleFunctionValue(int docBase, FunctionValues vals, IDictionary<int, double> cache) |
| { |
| this.docBase = docBase; |
| values = vals; |
| this.cache = cache; |
| } |
| |
| public override double DoubleVal(int doc) |
| { |
| int key = docBase + doc; |
| double v; |
| if (!cache.TryGetValue(key, out v)) |
| { |
| v = values.DoubleVal(doc); |
| cache[key] = v; |
| } |
| return v; |
| } |
| |
| /// <summary> |
| /// NOTE: This was floatVal() in Lucene |
| /// </summary> |
| public override float SingleVal(int doc) |
| { |
| return (float)DoubleVal(doc); |
| } |
| |
| public override string ToString(int doc) |
| { |
| return DoubleVal(doc) + string.Empty; |
| } |
| } |
| |
| #endregion |
| |
| public override bool Equals(object o) |
| { |
| if (this == o) return true; |
| |
| var that = o as CachingDoubleValueSource; |
| |
| if (that == null) return false; |
| if (m_source != null ? !m_source.Equals(that.m_source) : that.m_source != null) return false; |
| |
| return true; |
| } |
| |
| public override int GetHashCode() |
| { |
| return m_source != null ? m_source.GetHashCode() : 0; |
| } |
| } |
| } |