/*
* 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.jena.query.spatial;
import java.util.ArrayList;
import java.util.List;
import com.spatial4j.core.distance.DistanceUtils;
public class DistanceUnitsUtils {
public final static String defaultDistanceUnit = "kilometres" ;
public final static List<String> SUPPORTED_UNITS;
static {
// International spelling "metres"
// As used by http://en.wikipedia.org/wiki/International_Bureau_of_Weights_and_Measures
SUPPORTED_UNITS = new ArrayList<String>();
SUPPORTED_UNITS.add("kilometres");
SUPPORTED_UNITS.add("kilometers"); // America spelling
SUPPORTED_UNITS.add("km");
SUPPORTED_UNITS.add("meters");
SUPPORTED_UNITS.add("metres");
SUPPORTED_UNITS.add("m");
SUPPORTED_UNITS.add("centimeters");
SUPPORTED_UNITS.add("centimetres");
SUPPORTED_UNITS.add("cm");
SUPPORTED_UNITS.add("millimetres");
SUPPORTED_UNITS.add("millimeters");
SUPPORTED_UNITS.add("mm");
SUPPORTED_UNITS.add("miles");
SUPPORTED_UNITS.add("mi");
SUPPORTED_UNITS.add("degrees");
SUPPORTED_UNITS.add("de");
}
public static double dist2Degrees(double dist, String units) {
double degrees = dist;
if (units.equals("kilometers") || units.equals("kilometres") || units.equals("km"))
return DistanceUtils.dist2Degrees(dist,
DistanceUtils.EARTH_MEAN_RADIUS_KM);
else if (units.equals("meters") || units.equals("metres") || units.equals("m"))
return DistanceUtils.dist2Degrees(dist / 1000,
DistanceUtils.EARTH_MEAN_RADIUS_KM);
else if (units.equals("centimeters") || units.equals("centimetres") || units.equals("cm"))
return DistanceUtils.dist2Degrees(dist / (1000 * 100),
DistanceUtils.EARTH_MEAN_RADIUS_KM) ;
else if ( units.equals("millimeters") || units.equals("millimetres") || units.equals("mm") ||
units.equals("milimeters") || units.equals("milimetres") ) // Common spelling mistake.
return DistanceUtils.dist2Degrees(dist / (1000 * 1000),
DistanceUtils.EARTH_MEAN_RADIUS_KM) ;
else if (units.equals("miles") || units.equals("mi"))
return DistanceUtils.dist2Degrees(dist,
DistanceUtils.EARTH_MEAN_RADIUS_MI);
else if (units.equals("degrees") || units.equals("de"))
return degrees;
throw new IllegalArgumentException("unknow distance units: "+ units);
}
public static boolean isSupportedUnits(String units){
return SUPPORTED_UNITS.contains(units);
}
}