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HIVE-26223: Integrate ESRI GeoSpatial UDFs. (#3283). (Ayush Saxena, r…
…eviewed by Mahesh Kumar Behera)
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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.hadoop.hive.ql.udf.esri; | ||
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| import com.esri.core.geometry.Envelope; | ||
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| public class BinUtils { | ||
| final long numCols; | ||
| final double extentMin; | ||
| final double extentMax; | ||
| final double binSize; | ||
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| public BinUtils(double binSize) { | ||
| this.binSize = binSize; | ||
|
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| // absolute max number of rows/columns we can have | ||
| long maxBinsPerAxis = (long) Math.sqrt(Long.MAX_VALUE); | ||
|
|
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| // a smaller binSize gives us a smaller extent width and height that | ||
| // can be addressed by a single 64 bit long | ||
| double size = (binSize < 1) ? maxBinsPerAxis * binSize : maxBinsPerAxis; | ||
|
|
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| extentMax = size / 2; | ||
| extentMin = extentMax - size; | ||
| numCols = (long) (Math.ceil(size / binSize)); | ||
| } | ||
|
|
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| /** | ||
| * Gets bin ID from a point. | ||
| * | ||
| * @param x | ||
| * @param y | ||
| * @return | ||
| */ | ||
| public long getId(double x, double y) { | ||
| double down = (extentMax - y) / binSize; | ||
| double over = (x - extentMin) / binSize; | ||
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| return ((long) down * numCols) + (long) over; | ||
| } | ||
|
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| /** | ||
| * Gets the envelope for the bin ID. | ||
| * | ||
| * @param binId | ||
| * @param envelope | ||
| */ | ||
| public void queryEnvelope(long binId, Envelope envelope) { | ||
| long down = binId / numCols; | ||
| long over = binId % numCols; | ||
|
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| double xmin = extentMin + (over * binSize); | ||
| double xmax = xmin + binSize; | ||
| double ymax = extentMax - (down * binSize); | ||
| double ymin = ymax - binSize; | ||
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| envelope.setCoords(xmin, ymin, xmax, ymax); | ||
| } | ||
|
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| /** | ||
| * Gets the envelope for the bin that contains the x,y coords. | ||
| * | ||
| * @param x | ||
| * @param y | ||
| * @param envelope | ||
| */ | ||
| public void queryEnvelope(double x, double y, Envelope envelope) { | ||
| double down = (extentMax - y) / binSize; | ||
| double over = (x - extentMin) / binSize; | ||
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| double xmin = extentMin + (over * binSize); | ||
| double xmax = xmin + binSize; | ||
| double ymax = extentMax - (down * binSize); | ||
| double ymin = ymax - binSize; | ||
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| envelope.setCoords(xmin, ymin, xmax, ymax); | ||
| } | ||
| } |
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