Java tutorial
/** * Copyright 2014 Gustavo Martin Morcuende * * 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 name.gumartinm.weather.information.parser; import com.fasterxml.jackson.core.JsonFactory; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.core.JsonToken; import java.io.IOException; import java.util.ArrayList; import name.gumartinm.weather.information.model.forecastweather.City; import name.gumartinm.weather.information.model.forecastweather.Coord; import name.gumartinm.weather.information.model.forecastweather.Forecast; import name.gumartinm.weather.information.model.forecastweather.List; import name.gumartinm.weather.information.model.forecastweather.Temp; import name.gumartinm.weather.information.model.forecastweather.Weather; public class JPOSForecastParser { public Forecast retrieveForecastFromJPOS(final String jsonData) throws JsonParseException, IOException { final JsonFactory f = new JsonFactory(); final Forecast forecastWeatherData = new Forecast(); forecastWeatherData.setList(new ArrayList<List>(15)); final City city = new City(); city.setCoord(new Coord()); forecastWeatherData.setCity(city); final JsonParser jParser = f.createParser(jsonData); this.getForecastWeatherData(forecastWeatherData, jParser); return forecastWeatherData; } private void getForecastWeatherData(final Forecast forecastWeatherData, final JsonParser jParser) throws JsonParseException, IOException { if (jParser.nextToken() == JsonToken.START_OBJECT) { while (jParser.nextToken() != JsonToken.END_OBJECT) { final String fieldname = jParser.getCurrentName(); final JsonToken nextToken = jParser.nextToken(); if (nextToken == JsonToken.START_OBJECT) { this.getForecastWeatherDataObjects(forecastWeatherData, jParser, fieldname); } if (nextToken == JsonToken.START_ARRAY) { JsonToken tokenNext = jParser.nextToken(); while (tokenNext != JsonToken.END_ARRAY) { if (tokenNext == JsonToken.START_OBJECT) { this.getForecastWeatherDataObjects(forecastWeatherData, jParser, fieldname); } tokenNext = jParser.nextToken(); } } if ((nextToken == JsonToken.VALUE_NUMBER_INT) || (nextToken == JsonToken.VALUE_STRING)) { this.getForecastWeatherDataObjects(forecastWeatherData, jParser, fieldname); } } } } private void getForecastWeatherDataObjects(final Forecast forecastWeatherData, final JsonParser jParser, final String fieldname) throws JsonParseException, IOException { if ("cod".equals(fieldname)) { final String stringCod = jParser.getText(); forecastWeatherData.setCod(Long.valueOf(stringCod)); } if ("message".equals(fieldname)) { forecastWeatherData.setMessage(jParser.getDoubleValue()); } if ("city".equals(fieldname)) { while (jParser.nextToken() != JsonToken.END_OBJECT) { final String namefield = jParser.getCurrentName(); final JsonToken nextToken = jParser.nextToken(); // move to // value if ("id".equals(namefield)) { forecastWeatherData.getCity().setId(jParser.getLongValue()); } if ("name".equals(namefield)) { forecastWeatherData.getCity().setName(jParser.getText()); } if ("coord".equals(namefield)) { if (nextToken == JsonToken.START_OBJECT) { this.getForecastWeatherDataObjects(forecastWeatherData, jParser, namefield); } } if ("country".equals(namefield)) { forecastWeatherData.getCity().setCountry(jParser.getText()); } if ("population".equals(namefield)) { forecastWeatherData.getCity().setPopulation(jParser.getLongValue()); } } } if ("cnt".equals(fieldname)) { forecastWeatherData.setCnt(jParser.getIntValue()); } if ("coord".equals(fieldname)) { while (jParser.nextToken() != JsonToken.END_OBJECT) { final String namefield = jParser.getCurrentName(); jParser.nextToken(); // move to value if ("lon".equals(namefield)) { forecastWeatherData.getCity().getCoord().setLon(jParser.getDoubleValue()); } if ("lat".equals(namefield)) { forecastWeatherData.getCity().getCoord().setLat(jParser.getDoubleValue()); } } } if ("list".equals(fieldname)) { final name.gumartinm.weather.information.model.forecastweather.List list = new name.gumartinm.weather.information.model.forecastweather.List(); list.setTemp(new Temp()); list.setWeather(new ArrayList<Weather>()); forecastWeatherData.getList().add(list); while (jParser.nextToken() != JsonToken.END_OBJECT) { final String namefield = jParser.getCurrentName(); final JsonToken nextToken = jParser.nextToken(); // move to // value if ("dt".equals(namefield)) { list.setDt(jParser.getLongValue()); } if ("temp".equals(namefield)) { if (nextToken == JsonToken.START_OBJECT) { this.getForecastWeatherDataObjects(forecastWeatherData, jParser, namefield); } } if ("pressure".equals(namefield)) { list.setPressure(jParser.getDoubleValue()); } if ("humidity".equals(namefield)) { list.setHumidity(jParser.getDoubleValue()); } if ("weather".equals(namefield)) { if (nextToken == JsonToken.START_ARRAY) { JsonToken tokenNext = jParser.nextToken(); while (tokenNext != JsonToken.END_ARRAY) { if (tokenNext == JsonToken.START_OBJECT) { this.getForecastWeatherDataObjects(forecastWeatherData, jParser, namefield); } tokenNext = jParser.nextToken(); } } } if ("speed".equals(namefield)) { list.setSpeed(jParser.getDoubleValue()); } if ("deg".equals(namefield)) { list.setDeg(jParser.getDoubleValue()); } if ("clouds".equals(namefield)) { list.setClouds(jParser.getDoubleValue()); } if ("rain".equals(namefield)) { list.setRain(jParser.getDoubleValue()); } } } if ("temp".equals(fieldname)) { final name.gumartinm.weather.information.model.forecastweather.List list = forecastWeatherData.getList() .get((forecastWeatherData.getList().size() - 1)); while (jParser.nextToken() != JsonToken.END_OBJECT) { final String namefield = jParser.getCurrentName(); jParser.nextToken(); // move to value if ("day".equals(namefield)) { list.getTemp().setDay(jParser.getDoubleValue()); } if ("min".equals(namefield)) { list.getTemp().setMin(jParser.getDoubleValue()); } if ("max".equals(namefield)) { list.getTemp().setMax(jParser.getDoubleValue()); } if ("night".equals(namefield)) { list.getTemp().setNight(jParser.getDoubleValue()); } if ("eve".equals(namefield)) { list.getTemp().setEve(jParser.getDoubleValue()); } if ("morn".equals(namefield)) { list.getTemp().setMorn(jParser.getDoubleValue()); } } } if ("weather".equals(fieldname)) { final name.gumartinm.weather.information.model.forecastweather.List list = forecastWeatherData.getList() .get((forecastWeatherData.getList().size() - 1)); final Weather weather = new Weather(); while (jParser.nextToken() != JsonToken.END_OBJECT) { final String namefield = jParser.getCurrentName(); jParser.nextToken(); // move to value if ("id".equals(namefield)) { weather.setId(jParser.getIntValue()); } if ("main".equals(namefield)) { weather.setMain(jParser.getText()); } if ("description".equals(namefield)) { weather.setDescription(jParser.getText()); } if ("icon".equals(namefield)) { weather.setIcon(jParser.getText()); } } list.getWeather().add(weather); } } }