85 lines
3.0 KiB
Java
85 lines
3.0 KiB
Java
/*
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* Copyright (C) 2016 The CyanogenMod Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cyanogenmod.weather.util;
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import cyanogenmod.providers.WeatherContract;
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import java.text.DecimalFormat;
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/**
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* Helper class to perform operations and formatting of weather data
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*/
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public class WeatherUtils {
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/**
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* Converts a temperature expressed in degrees Celsius to degrees Fahrenheit
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* @param celsius temperature in Celsius
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* @return the temperature in degrees Fahrenheit
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*/
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public static float celsiusToFahrenheit(float celsius) {
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return ((celsius * (9f/5f)) + 32f);
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}
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/**
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* Converts a temperature expressed in degrees Fahrenheit to degrees Celsius
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* @param fahrenheit temperature in Fahrenheit
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* @return the temperature in degrees Celsius
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*/
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public static float fahrenheitToCelsius(float fahrenheit) {
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return ((fahrenheit - 32f) * (5f/9f));
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}
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/**
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* Returns a string representation of the temperature and unit supplied. The temperature value
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* will be half-even rounded.
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* @param temperature the temperature value
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* @param tempUnit A valid {@link WeatherContract.WeatherColumns.TempUnit}
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* @return A string with the format XX°F or XX°C (where XX is the temperature)
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* depending on the temperature unit that was provided or null if an invalid unit is supplied
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*/
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public static String formatTemperature(float temperature, int tempUnit) {
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if (!isValidTempUnit(tempUnit)) return null;
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if (Float.isNaN(temperature)) return "-";
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DecimalFormat noDigitsFormat = new DecimalFormat("0");
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String noDigitsTemp = noDigitsFormat.format(temperature);
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if (noDigitsTemp.equals("-0")) {
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noDigitsTemp = "0";
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}
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StringBuilder formatted = new StringBuilder()
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.append(noDigitsTemp).append("\u00b0");
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if (tempUnit == WeatherContract.WeatherColumns.TempUnit.CELSIUS) {
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formatted.append("C");
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} else if (tempUnit == WeatherContract.WeatherColumns.TempUnit.FAHRENHEIT) {
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formatted.append("F");
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}
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return formatted.toString();
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}
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private static boolean isValidTempUnit(int unit) {
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switch (unit) {
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case WeatherContract.WeatherColumns.TempUnit.CELSIUS:
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case WeatherContract.WeatherColumns.TempUnit.FAHRENHEIT:
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return true;
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default:
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return false;
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}
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}
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}
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