/* * 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 hivemall.geospatial; import hivemall.utils.geospatial.GeoSpatialUtils; import hivemall.utils.hadoop.HiveUtils; import hivemall.utils.lang.Preconditions; import java.util.Arrays; import org.apache.hadoop.hive.ql.exec.Description; import org.apache.hadoop.hive.ql.exec.UDFArgumentException; import org.apache.hadoop.hive.ql.metadata.HiveException; import org.apache.hadoop.hive.ql.udf.UDFType; import org.apache.hadoop.hive.ql.udf.generic.GenericUDF; import org.apache.hadoop.hive.serde2.io.DoubleWritable; import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector; import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory; import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils; /** * @link http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames */ @Description(name = "tilex2lon", value = "_FUNC_(int x, int zoom)::double - Returns longitude of the given tile x and zoom level") @UDFType(deterministic = true, stateful = false) public final class TileX2LonUDF extends GenericUDF { private PrimitiveObjectInspector xOI; private PrimitiveObjectInspector zoomOI; private DoubleWritable result; @Override public ObjectInspector initialize(ObjectInspector[] argOIs) throws UDFArgumentException { if (argOIs.length != 2) { throw new UDFArgumentException("_FUNC_ takes exactly 2 arguments: " + argOIs.length); } this.xOI = HiveUtils.asIntegerOI(argOIs[0]); this.zoomOI = HiveUtils.asIntegerOI(argOIs[1]); this.result = new DoubleWritable(); return PrimitiveObjectInspectorFactory.writableDoubleObjectInspector; } @Override public DoubleWritable evaluate(DeferredObject[] arguments) throws HiveException { Object arg0 = arguments[0].get(); Object arg1 = arguments[1].get(); if (arg0 == null) { return null; } if (arg1 == null) { throw new UDFArgumentException("zoom level should not be null"); } int x = PrimitiveObjectInspectorUtils.getInt(arg0, xOI); int zoom = PrimitiveObjectInspectorUtils.getInt(arg1, zoomOI); Preconditions.checkArgument(zoom >= 0, "Invalid zoom level", UDFArgumentException.class); final double lon; try { lon = GeoSpatialUtils.tilex2lon(x, zoom); } catch (IllegalArgumentException ex) { throw new UDFArgumentException(ex); } result.set(lon); return result; } @Override public String getDisplayString(String[] children) { return "tilex2lon(" + Arrays.toString(children) + ")"; } }