| using Lucene.Net.Spatial.Prefix.Tree; |
| using Lucene.Net.Spatial.Util; |
| using Lucene.Net.Util; |
| using Spatial4n.Core.Shapes; |
| |
| namespace Lucene.Net.Spatial.Prefix |
| { |
| /* |
| * 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> |
| /// Implementation of <see cref="Lucene.Net.Spatial.Util.ShapeFieldCacheProvider{T}"/> |
| /// designed for <see cref="PrefixTreeStrategy">PrefixTreeStrategy</see>s. |
| /// |
| /// Note, due to the fragmented representation of Shapes in these Strategies, this implementation |
| /// can only retrieve the central <see cref="IPoint">Point</see> of the original Shapes. |
| /// |
| /// @lucene.internal |
| /// </summary> |
| public class PointPrefixTreeFieldCacheProvider : ShapeFieldCacheProvider<IPoint> |
| { |
| internal readonly SpatialPrefixTree grid; // |
| |
| public PointPrefixTreeFieldCacheProvider(SpatialPrefixTree grid, string shapeField, int defaultSize) |
| : base(shapeField, defaultSize) |
| { |
| this.grid = grid; |
| } |
| |
| private Cell scanCell = null;//re-used in readShape to save GC |
| |
| protected internal override IPoint ReadShape(BytesRef term) |
| { |
| scanCell = grid.GetCell(term.Bytes, term.Offset, term.Length, scanCell); |
| if (scanCell.Level == grid.MaxLevels && !scanCell.IsLeaf) |
| { |
| return scanCell.Center; |
| } |
| return null; |
| } |
| } |
| } |