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[SEDONA-647] Add ST_RemoveRepeatedPoints (#1557)
* feat: add ST_RemoveRepeatedPoints * fix: lint errors * fix: snowflake typos * change variable names, divide the function tests, add detailed examples docs, add more tests in spark
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common/src/main/java/org/apache/sedona/common/utils/GeometryDuplicateCoordinateRemover.java
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| /* | ||
| * 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. | ||
| */ | ||
| package org.apache.sedona.common.utils; | ||
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| import java.util.Arrays; | ||
| import java.util.LinkedHashSet; | ||
| import java.util.Objects; | ||
| import java.util.Set; | ||
| import org.locationtech.jts.geom.*; | ||
|
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| public class GeometryDuplicateCoordinateRemover { | ||
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| public static Coordinate[] removeDuplicates(Coordinate[] coords, int minPoints) { | ||
| Coordinate currentPoint; | ||
| int numPoint = coords.length; | ||
| int totalPointsOut = 1; | ||
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| double distance = Double.MAX_VALUE; | ||
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| if (numPoint <= minPoints) return new Coordinate[0]; | ||
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| Coordinate lastPoint = coords[0]; | ||
| int writeIndex = 1; | ||
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| for (int i = 1; i < numPoint; i++) { | ||
| boolean isLastPoint = (i == numPoint - 1); | ||
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| currentPoint = coords[i]; | ||
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| if (numPoint + totalPointsOut > minPoints + i) { | ||
| if (TOLERANCE > 0.0) { | ||
| distance = currentPoint.distance(lastPoint); | ||
| if (!isLastPoint && distance <= TOLERANCE) { | ||
| continue; | ||
| } | ||
| } else { | ||
| if (currentPoint.equals2D(lastPoint)) { | ||
| continue; | ||
| } | ||
| } | ||
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| if (isLastPoint && totalPointsOut > 1 && TOLERANCE > 0.0 && distance <= TOLERANCE) { | ||
| totalPointsOut--; | ||
| writeIndex--; | ||
| } | ||
| } | ||
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| coords[writeIndex] = currentPoint; | ||
| totalPointsOut++; | ||
| writeIndex++; | ||
| lastPoint = currentPoint; | ||
| } | ||
| Coordinate[] newCoordinates = new Coordinate[totalPointsOut]; | ||
| System.arraycopy(coords, 0, newCoordinates, 0, totalPointsOut); | ||
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| return newCoordinates; | ||
| } | ||
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| public static Coordinate[] removeDuplicatePointsMultiPoint( | ||
| Coordinate[] coords, boolean recursion) { | ||
| if (TOLERANCE == 0 || recursion) { | ||
| Set<Coordinate> uniqueCoords = new LinkedHashSet<>(Arrays.asList(coords)); | ||
| return uniqueCoords.toArray(new Coordinate[0]); | ||
| } | ||
| Coordinate[] deduplicated = | ||
| Arrays.stream(removeDuplicatePointsMultiPoint(coords, true)) | ||
| .sorted() | ||
| .toArray(Coordinate[]::new); | ||
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| for (int i = 0; i < deduplicated.length; i++) { | ||
| for (int j = i + 1; j < deduplicated.length; j++) { | ||
| if (deduplicated[i] != null | ||
| && deduplicated[j] != null | ||
| && deduplicated[i].distance(deduplicated[j]) < TOLERANCE) { | ||
| deduplicated[j] = null; | ||
| } else { | ||
| break; | ||
| } | ||
| } | ||
| } | ||
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| return Arrays.stream(deduplicated).filter(Objects::nonNull).toArray(Coordinate[]::new); | ||
| } | ||
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| private static GeometryFactory FACTORY = null; | ||
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| private static double TOLERANCE = 0; | ||
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| public static Geometry process(Geometry geometry, double tolerance) { | ||
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| TOLERANCE = tolerance; | ||
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| if (geometry.isEmpty()) return geometry; | ||
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| FACTORY = geometry.getFactory(); | ||
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| if (geometry.getGeometryType().equals(Geometry.TYPENAME_POINT)) return geometry; | ||
| if (geometry.getGeometryType().equals(Geometry.TYPENAME_MULTIPOINT)) | ||
| return processMultiPoint((MultiPoint) geometry); | ||
| if (geometry.getGeometryType().equals(Geometry.TYPENAME_LINEARRING)) | ||
| return processLinearRing((LinearRing) geometry); | ||
| if (geometry.getGeometryType().equals(Geometry.TYPENAME_LINESTRING)) | ||
| return processLineString((LineString) geometry); | ||
| if (geometry.getGeometryType().equals(Geometry.TYPENAME_MULTILINESTRING)) | ||
| return processMultiLineString((MultiLineString) geometry); | ||
| if (geometry.getGeometryType().equals(Geometry.TYPENAME_POLYGON)) | ||
| return processPolygon((Polygon) geometry); | ||
| if (geometry.getGeometryType().equals(Geometry.TYPENAME_MULTIPOLYGON)) | ||
| return processMultiPolygon((MultiPolygon) geometry); | ||
| if (geometry.getGeometryType().equals(Geometry.TYPENAME_GEOMETRYCOLLECTION)) | ||
| return processGeometryCollection((GeometryCollection) geometry); | ||
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| throw new IllegalArgumentException( | ||
| "Unknown Geometry subtype: " + geometry.getClass().getName()); | ||
| } | ||
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| private static MultiPoint processMultiPoint(MultiPoint geometry) { | ||
| Coordinate[] coords = geometry.getCoordinates(); | ||
| return FACTORY.createMultiPointFromCoords(removeDuplicatePointsMultiPoint(coords, false)); | ||
| } | ||
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| private static LinearRing processLinearRing(LinearRing geometry) { | ||
| Coordinate[] coords = geometry.getCoordinates(); | ||
| return FACTORY.createLinearRing(removeDuplicates(coords, 4)); | ||
| } | ||
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| private static LineString processLineString(LineString geometry) { | ||
| if (geometry.getNumPoints() <= 2) return geometry; | ||
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| Coordinate[] coords = geometry.getCoordinates(); | ||
| return FACTORY.createLineString(removeDuplicates(coords, 2)); | ||
| } | ||
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| private static MultiLineString processMultiLineString(MultiLineString geometry) { | ||
| LineString[] lineStrings = new LineString[geometry.getNumGeometries()]; | ||
| for (int i = 0; i < lineStrings.length; i++) { | ||
| lineStrings[i] = processLineString((LineString) geometry.getGeometryN(i)); | ||
| } | ||
| return FACTORY.createMultiLineString(lineStrings); | ||
| } | ||
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| private static Polygon processPolygon(Polygon geometry) { | ||
| LinearRing shell = processLinearRing(geometry.getExteriorRing()); | ||
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| LinearRing[] holes = new LinearRing[geometry.getNumInteriorRing()]; | ||
| for (int i = 0; i < holes.length; i++) { | ||
| holes[i] = processLinearRing(geometry.getInteriorRingN(i)); | ||
| } | ||
| return FACTORY.createPolygon(shell, holes); | ||
| } | ||
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| private static MultiPolygon processMultiPolygon(MultiPolygon geometry) { | ||
| Polygon[] polygons = new Polygon[geometry.getNumGeometries()]; | ||
| for (int i = 0; i < polygons.length; i++) { | ||
| polygons[i] = processPolygon((Polygon) geometry.getGeometryN(i)); | ||
| } | ||
| return FACTORY.createMultiPolygon(polygons); | ||
| } | ||
|
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| private static GeometryCollection processGeometryCollection(GeometryCollection geometry) { | ||
| Geometry[] geometries = new Geometry[geometry.getNumGeometries()]; | ||
| for (int i = 0; i < geometries.length; i++) { | ||
| geometries[i] = process(geometry.getGeometryN(i), TOLERANCE); | ||
| } | ||
| return FACTORY.createGeometryCollection(geometries); | ||
| } | ||
| } |
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