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/*
* Copyright (C) 2016 The CyanogenMod Project
*
* Licensed 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 cyanogenmod.weather.util;
import cyanogenmod.providers.WeatherContract;
import java.text.DecimalFormat;
/**
* Helper class to perform operations and formatting of weather data
*/
public class WeatherUtils {
/**
* Converts a temperature expressed in degrees Celsius to degrees Fahrenheit
* @param celsius temperature in Celsius
* @return the temperature in degrees Fahrenheit
*/
public static double celsiusToFahrenheit(double celsius) {
return ((celsius * (9d/5d)) + 32d);
}
/**
* Converts a temperature expressed in degrees Fahrenheit to degrees Celsius
* @param fahrenheit temperature in Fahrenheit
* @return the temperature in degrees Celsius
*/
public static double fahrenheitToCelsius(double fahrenheit) {
return ((fahrenheit - 32d) * (5d/9d));
}
/**
* Returns a string representation of the temperature and unit supplied. The temperature value
* will be half-even rounded.
* @param temperature the temperature value
* @param tempUnit A valid {@link WeatherContract.WeatherColumns.TempUnit}
* @return A string with the format XX°F or XX°C (where XX is the temperature)
* depending on the temperature unit that was provided or null if an invalid unit is supplied
*/
public static String formatTemperature(double temperature, int tempUnit) {
if (!isValidTempUnit(tempUnit)) return null;
if (Double.isNaN(temperature)) return "-";
DecimalFormat noDigitsFormat = new DecimalFormat("0");
String noDigitsTemp = noDigitsFormat.format(temperature);
if (noDigitsTemp.equals("-0")) {
noDigitsTemp = "0";
}
StringBuilder formatted = new StringBuilder()
.append(noDigitsTemp).append("\u00b0");
if (tempUnit == WeatherContract.WeatherColumns.TempUnit.CELSIUS) {
formatted.append("C");
} else if (tempUnit == WeatherContract.WeatherColumns.TempUnit.FAHRENHEIT) {
formatted.append("F");
}
return formatted.toString();
}
private static boolean isValidTempUnit(int unit) {
switch (unit) {
case WeatherContract.WeatherColumns.TempUnit.CELSIUS:
case WeatherContract.WeatherColumns.TempUnit.FAHRENHEIT:
return true;
default:
return false;
}
}
}
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