/Sky/Sky/src/org/jsharkey/sky/ForecastUtils.java
Java | 119 lines | 58 code | 11 blank | 50 comment | 19 complexity | 758d4078f593fd2ada73704247e4f596 MD5 | raw file
1/* 2 * Copyright (C) 2009 Jeff Sharkey, http://jsharkey.org/ 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package org.jsharkey.sky; 18 19import java.util.regex.Pattern; 20 21import org.jsharkey.sky.ForecastProvider.AppWidgetsColumns; 22import org.jsharkey.sky.ForecastProvider.ForecastsColumns; 23 24import android.content.res.Resources; 25import android.text.format.Time; 26 27/** 28 * Various forecast utilities. 29 */ 30public class ForecastUtils { 31 /** 32 * Time when we consider daytime to begin. We keep this early to make sure 33 * that our 6AM widget update will change icons correctly. 34 */ 35 private static final int DAYTIME_BEGIN_HOUR = 5; 36 37 /** 38 * Time when we consider daytime to end. We keep this early to make sure 39 * that our 6PM widget update will change icons correctly. 40 */ 41 private static final int DAYTIME_END_HOUR = 16; 42 43 private static final Pattern sIconAlert = Pattern.compile("(alert|advisory|warning|watch)", Pattern.CASE_INSENSITIVE); 44 private static final Pattern sIconStorm = Pattern.compile("(thunder|tstms)", Pattern.CASE_INSENSITIVE); 45 private static final Pattern sIconSnow = Pattern.compile("(snow|ice|frost|flurries)", Pattern.CASE_INSENSITIVE); 46 private static final Pattern sIconShower = Pattern.compile("(rain)", Pattern.CASE_INSENSITIVE); 47 private static final Pattern sIconScatter = Pattern.compile("(shower|drizzle)", Pattern.CASE_INSENSITIVE); 48 private static final Pattern sIconClear = Pattern.compile("(sunny|breezy|clear)", Pattern.CASE_INSENSITIVE); 49 private static final Pattern sIconClouds = Pattern.compile("(cloud|fog)", Pattern.CASE_INSENSITIVE); 50 51 /** 52 * Select an icon to describe the given {@link ForecastsColumns#CONDITIONS} 53 * string. Uses a descending importance scale that matches keywords against 54 * the described conditions. 55 * 56 * @param daytime If true, return daylight-specific icons when available, 57 * otherwise assume night icons. 58 */ 59 public static int getIconForForecast(String conditions, boolean daytime) { 60 int icon = 0; 61 if (sIconAlert.matcher(conditions).find()) { 62 icon = R.drawable.weather_severe_alert; 63 } else if (sIconStorm.matcher(conditions).find()) { 64 icon = R.drawable.weather_storm; 65 } else if (sIconSnow.matcher(conditions).find()) { 66 icon = R.drawable.weather_snow; 67 } else if (sIconShower.matcher(conditions).find()) { 68 icon = R.drawable.weather_showers; 69 } else if (sIconScatter.matcher(conditions).find()) { 70 icon = R.drawable.weather_showers_scattered; 71 } else if (sIconClear.matcher(conditions).find()) { 72 icon = daytime ? R.drawable.weather_clear : R.drawable.weather_clear_night; 73 } else if (sIconClouds.matcher(conditions).find()) { 74 icon = daytime ? R.drawable.weather_few_clouds : R.drawable.weather_few_clouds_night; 75 } 76 return icon; 77 } 78 79 /** 80 * Correctly format the given temperature for user display. 81 * 82 * @param temp Temperature to format, in degrees Fahrenheit. 83 * @param units Target units to convert to before displaying, usually 84 * something like {@link AppWidgetsColumns#UNITS_FAHRENHEIT}. 85 */ 86 public static String formatTemp(Resources res, int temp, int units) { 87 if (units == AppWidgetsColumns.UNITS_FAHRENHEIT) { 88 return res.getString(R.string.temperature_f, temp); 89 } else if (units == AppWidgetsColumns.UNITS_CELSIUS) { 90 // Convert to Celsius before display 91 temp = ((temp - 32) * 5) / 9; 92 return res.getString(R.string.temperature_c, temp); 93 } 94 return null; 95 } 96 97 /** 98 * Get the timestamp of the last midnight, in a base similar to 99 * {@link System#currentTimeMillis()}. 100 */ 101 public static long getLastMidnight() { 102 Time time = new Time(); 103 time.setToNow(); 104 time.hour = 0; 105 time.minute = 0; 106 time.second = 0; 107 return time.toMillis(false); 108 } 109 110 /** 111 * Calcuate if it's currently "daytime" by our internal definition. Used to 112 * decide which icons to show when updating widgets. 113 */ 114 public static boolean isDaytime() { 115 Time time = new Time(); 116 time.setToNow(); 117 return (time.hour >= DAYTIME_BEGIN_HOUR && time.hour <= DAYTIME_END_HOUR); 118 } 119}