| package org.apache.lucene.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. |
| */ |
| |
| import com.spatial4j.core.shape.Point; |
| import org.apache.lucene.spatial.prefix.tree.Cell; |
| import org.apache.lucene.spatial.prefix.tree.SpatialPrefixTree; |
| import org.apache.lucene.spatial.util.ShapeFieldCacheProvider; |
| import org.apache.lucene.util.BytesRef; |
| |
| /** |
| * Implementation of {@link ShapeFieldCacheProvider} designed for {@link PrefixTreeStrategy}s. |
| * |
| * Note, due to the fragmented representation of Shapes in these Strategies, this implementation |
| * can only retrieve the central {@link Point} of the original Shapes. |
| * |
| * @lucene.internal |
| */ |
| public class PointPrefixTreeFieldCacheProvider extends ShapeFieldCacheProvider<Point> { |
| |
| final SpatialPrefixTree grid; // |
| |
| public PointPrefixTreeFieldCacheProvider(SpatialPrefixTree grid, String shapeField, int defaultSize) { |
| super( shapeField, defaultSize ); |
| this.grid = grid; |
| } |
| |
| private Cell scanCell = null;//re-used in readShape to save GC |
| |
| @Override |
| protected Point readShape(BytesRef term) { |
| scanCell = grid.getCell(term.bytes, term.offset, term.length, scanCell); |
| if (scanCell.getLevel() == grid.getMaxLevels() && !scanCell.isLeaf()) |
| return scanCell.getCenter(); |
| return null; |
| } |
| } |