Java tutorial
/** * Copyright (c) 2010-2015, openHAB.org and others. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html */ package org.openhab.binding.weather.internal.bus; import java.math.BigDecimal; import java.util.Calendar; import org.apache.commons.lang.StringUtils; import org.apache.commons.lang.WordUtils; import org.openhab.binding.weather.WeatherBindingProvider; import org.openhab.binding.weather.internal.common.WeatherContext; import org.openhab.binding.weather.internal.common.binding.ForecastBindingConfig; import org.openhab.binding.weather.internal.common.binding.WeatherBindingConfig; import org.openhab.binding.weather.internal.model.Temperature; import org.openhab.binding.weather.internal.model.Weather; import org.openhab.binding.weather.internal.utils.ItemIterator; import org.openhab.binding.weather.internal.utils.ItemIterator.ItemIteratorCallback; import org.openhab.binding.weather.internal.utils.PropertyUtils; import org.openhab.binding.weather.internal.utils.UnitUtils; import org.openhab.core.library.types.DateTimeType; import org.openhab.core.library.types.DecimalType; import org.openhab.core.library.types.StringType; import org.openhab.core.types.UnDefType; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Publishes object properties to items. * * @author Gerhard Riegler * @since 1.6.0 */ public class WeatherPublisher { private static final Logger logger = LoggerFactory.getLogger(WeatherPublisher.class); private WeatherContext context = WeatherContext.getInstance(); private static WeatherPublisher instance = null; private WeatherPublisher() { } /** * Returns the singleton instance of WeatherPublisher. */ public static WeatherPublisher getInstance() { if (instance == null) { instance = new WeatherPublisher(); } return instance; } /** * Republish the state of the item. */ public void republishItem(String itemName) { WeatherBindingConfig bindingConfig = null; for (WeatherBindingProvider provider : context.getProviders()) { if (bindingConfig == null) { bindingConfig = provider.getBindingFor(itemName); } } if (bindingConfig == null) { logger.warn("Weather binding for item {} not found", itemName); } else { publish(bindingConfig.getLocationId()); } } /** * Iterates through all items and publishes the states for the locationId. */ public void publish(final String locationId) { final Weather weather = context.getWeather(locationId); if (weather != null) { new ItemIterator().iterate(new ItemIteratorCallback() { @Override public void next(WeatherBindingConfig bindingConfig, String itemName) { if (bindingConfig.getLocationId().equals(locationId)) { try { Weather instance = getInstance(weather, bindingConfig); if (instance != null) { String weatherProperty = bindingConfig.getWeatherProperty(); Object value = null; if (Weather.isVirtualProperty(weatherProperty)) { Temperature temp = instance.getTemperature(); if (Weather.VIRTUAL_TEMP_MINMAX.equals(weatherProperty)) { Double min = UnitUtils.convertUnit(temp.getMin(), bindingConfig.getUnit(), bindingConfig.getWeatherProperty()); Double max = UnitUtils.convertUnit(temp.getMax(), bindingConfig.getUnit(), bindingConfig.getWeatherProperty()); value = getMinMax(min, max, bindingConfig); } } else { value = PropertyUtils.getPropertyValue(instance, weatherProperty); if (bindingConfig.hasUnit()) { value = UnitUtils.convertUnit((Double) value, bindingConfig.getUnit(), bindingConfig.getWeatherProperty()); } } publishValue(itemName, value, bindingConfig); } } catch (Exception ex) { logger.warn(ex.getMessage(), ex); } } } }); } } /** * Returns the minMax virtual property as a string. */ private String getMinMax(Double min, Double max, WeatherBindingConfig bindingConfig) { return toDisplayString(min, bindingConfig) + "/" + toDisplayString(max, bindingConfig); } /** * Returns a rounded double value as string. */ private String toDisplayString(Double value, WeatherBindingConfig bindingConfig) { return value == null ? "-" : round(value.toString(), bindingConfig).toString(); } /** * Returns the weather or the correct forecast object instance. */ private Weather getInstance(Weather weather, WeatherBindingConfig bindingConfig) { Weather instance = weather; if (bindingConfig instanceof ForecastBindingConfig) { ForecastBindingConfig fcConfig = (ForecastBindingConfig) bindingConfig; if (fcConfig.getForecastDay() < weather.getForecast().size()) { instance = weather.getForecast().get(fcConfig.getForecastDay()); } else { logger.warn("Weather forecast day {} not available for locationId '{}', only {} available", fcConfig.getForecastDay(), bindingConfig.getLocationId(), Math.max(weather.getForecast().size() - 1, 0)); instance = null; } } return instance; } /** * Publishes the item with the value. */ private void publishValue(String itemName, Object value, WeatherBindingConfig bindingConfig) { if (value == null) { context.getEventPublisher().postUpdate(itemName, UnDefType.UNDEF); } else if (value instanceof Calendar) { Calendar calendar = (Calendar) value; context.getEventPublisher().postUpdate(itemName, new DateTimeType(calendar)); } else if (value instanceof Number) { context.getEventPublisher().postUpdate(itemName, new DecimalType(round(value.toString(), bindingConfig))); } else if (value instanceof String || value instanceof Enum) { if (value instanceof Enum) { String enumValue = WordUtils.capitalizeFully(StringUtils.replace(value.toString(), "_", " ")); context.getEventPublisher().postUpdate(itemName, new StringType(enumValue)); } else { context.getEventPublisher().postUpdate(itemName, new StringType(value.toString())); } } else { logger.warn("Unsupported value type {}", value.getClass().getSimpleName()); } } /** * Returns a rounded value from the string. */ private BigDecimal round(String value, WeatherBindingConfig bindingConfig) { if (bindingConfig.getRoundingMode() == null) { return new BigDecimal(value); } return new BigDecimal(value).setScale(bindingConfig.getScale(), bindingConfig.getRoundingMode()); } }