| using Lucene.Net.Index; |
| using Lucene.Net.Search; |
| using Lucene.Net.Util; |
| using Spatial4n.Core.Shapes; |
| using System.Runtime.CompilerServices; |
| |
| 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> |
| /// Provides access to a |
| /// <see cref="ShapeFieldCache{T}">ShapeFieldCache<T></see> |
| /// for a given |
| /// <see cref="Lucene.Net.Index.AtomicReader">Lucene.Net.Index.AtomicReader</see>. |
| /// |
| /// If a Cache does not exist for the TextReader, then it is built by iterating over |
| /// the all terms for a given field, reconstructing the Shape from them, and adding |
| /// them to the Cache. |
| /// </summary> |
| /// @lucene.internal |
| public abstract class ShapeFieldCacheProvider<T> |
| where T : IShape |
| { |
| //private Logger log = Logger.GetLogger(GetType().FullName); |
| |
| private readonly ConditionalWeakTable<IndexReader, ShapeFieldCache<T>> sidx = |
| new ConditionalWeakTable<IndexReader, ShapeFieldCache<T>>(); |
| |
| protected internal readonly int m_defaultSize; |
| protected internal readonly string m_shapeField; |
| |
| protected ShapeFieldCacheProvider(string shapeField, int defaultSize) // LUCENENET: CA1012: Abstract types should not have constructors (marked protected) |
| { |
| // it may be a List<T> or T |
| this.m_shapeField = shapeField; |
| this.m_defaultSize = defaultSize; |
| } |
| |
| protected internal abstract T ReadShape(BytesRef term); |
| |
| public virtual ShapeFieldCache<T> GetCache(AtomicReader reader) |
| { |
| // LUCENENET: ConditionalWeakTable allows us to simplify and remove locks |
| return sidx.GetValue(reader, (key) => |
| { |
| /*long startTime = Runtime.CurrentTimeMillis(); |
| log.Fine("Building Cache [" + reader.MaxDoc() + "]");*/ |
| ShapeFieldCache<T> idx = new ShapeFieldCache<T>(key.MaxDoc, m_defaultSize); |
| int count = 0; |
| DocsEnum docs = null; |
| Terms terms = ((AtomicReader)key).GetTerms(m_shapeField); |
| TermsEnum te = null; |
| if (terms != null) |
| { |
| te = terms.GetEnumerator(te); |
| while (te.MoveNext()) |
| { |
| T shape = ReadShape(te.Term); |
| if (shape != null) |
| { |
| docs = te.Docs(null, docs, DocsFlags.NONE); |
| int docid = docs.NextDoc(); |
| while (docid != DocIdSetIterator.NO_MORE_DOCS) |
| { |
| idx.Add(docid, shape); |
| docid = docs.NextDoc(); |
| count++; |
| } |
| } |
| } |
| } |
| /*long elapsed = Runtime.CurrentTimeMillis() - startTime; |
| log.Fine("Cached: [" + count + " in " + elapsed + "ms] " + idx);*/ |
| return idx; |
| }); |
| } |
| } |
| } |