/* * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com) * * 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 org.traccar.web; import java.beans.Introspector; import java.io.Reader; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.text.ParseException; import java.util.Collection; import java.util.Date; import java.util.Map; import javax.json.Json; import javax.json.JsonArray; import javax.json.JsonArrayBuilder; import javax.json.JsonObject; import javax.json.JsonObjectBuilder; import javax.json.JsonReader; import javax.json.JsonValue; import org.joda.time.DateTime; import org.joda.time.format.DateTimeFormatter; import org.joda.time.format.ISODateTimeFormat; import org.traccar.helper.Log; import org.traccar.model.MiscFormatter; public final class JsonConverter { private JsonConverter() { } private static final DateTimeFormatter DATE_FORMAT = ISODateTimeFormat.dateTime(); public static Date parseDate(String value) { return DATE_FORMAT.parseDateTime(value).toDate(); } public static <T> T objectFromJson(Reader reader, Class<T> clazz) throws ParseException { try (JsonReader jsonReader = Json.createReader(reader)) { return objectFromJson(jsonReader.readObject(), clazz); } } public static <T> T objectFromJson(JsonObject json, Class<T> clazz) { try { T object = clazz.newInstance(); Method[] methods = object.getClass().getMethods(); return objectFromJson(json, object, methods); } catch (InstantiationException | IllegalAccessException e) { throw new IllegalArgumentException(); } } private static <T> T objectFromJson(JsonObject json, T object, Method[] methods) { for (final Method method : methods) { if (method.getName().startsWith("set") && method.getParameterTypes().length == 1) { final String name = Introspector.decapitalize(method.getName().substring(3)); Class<?> parameterType = method.getParameterTypes()[0]; if (json.containsKey(name) && !json.isNull(name)) { try { if (parameterType.equals(boolean.class)) { method.invoke(object, json.getBoolean(name)); } else if (parameterType.equals(int.class)) { method.invoke(object, json.getJsonNumber(name).intValue()); } else if (parameterType.equals(long.class)) { if (json.get(name).getValueType() == JsonValue.ValueType.NUMBER) { method.invoke(object, json.getJsonNumber(name).longValue()); } } else if (parameterType.equals(double.class)) { method.invoke(object, json.getJsonNumber(name).doubleValue()); } else if (parameterType.equals(String.class)) { method.invoke(object, json.getString(name)); } else if (parameterType.equals(Date.class)) { method.invoke(object, DATE_FORMAT.parseDateTime(json.getString(name)).toDate()); } else if (parameterType.equals(Map.class)) { method.invoke(object, MiscFormatter.fromJson(json.getJsonObject(name))); } } catch (IllegalAccessException | InvocationTargetException error) { Log.warning(error); } } } } return object; } public static <T> JsonObject objectToJson(T object) { JsonObjectBuilder json = Json.createObjectBuilder(); Method[] methods = object.getClass().getMethods(); for (Method method : methods) { if (method.isAnnotationPresent(JsonIgnore.class)) { continue; } if (method.getName().startsWith("get") && method.getParameterTypes().length == 0) { String name = Introspector.decapitalize(method.getName().substring(3)); try { if (method.getReturnType().equals(boolean.class)) { json.add(name, (Boolean) method.invoke(object)); } else if (method.getReturnType().equals(int.class)) { json.add(name, (Integer) method.invoke(object)); } else if (method.getReturnType().equals(long.class)) { json.add(name, (Long) method.invoke(object)); } else if (method.getReturnType().equals(double.class)) { json.add(name, (Double) method.invoke(object)); } else if (method.getReturnType().equals(String.class)) { String value = (String) method.invoke(object); if (value != null) { json.add(name, value); } } else if (method.getReturnType().equals(Date.class)) { Date value = (Date) method.invoke(object); if (value != null) { json.add(name, DATE_FORMAT.print(new DateTime(value))); } } else if (method.getReturnType().equals(Map.class)) { json.add(name, MiscFormatter.toJson((Map) method.invoke(object))); } } catch (IllegalAccessException | InvocationTargetException error) { Log.warning(error); } } } return json.build(); } public static JsonArray arrayToJson(Collection<?> array) { JsonArrayBuilder json = Json.createArrayBuilder(); for (Object object : array) { json.add(objectToJson(object)); } return json.build(); } }