/* * 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.http; import java.beans.Introspector; import java.io.Reader; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Collection; import java.util.Date; import javax.json.Json; import javax.json.JsonArray; import javax.json.JsonArrayBuilder; import javax.json.JsonObject; import javax.json.JsonObjectBuilder; import javax.json.JsonValue; import org.traccar.model.Factory; public class JsonConverter { private static final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss"); public static Date parseDate(String value) throws ParseException { return dateFormat.parse(value); } public static <T extends Factory> T objectFromJson(Reader reader, T prototype) throws ParseException { return objectFromJson(Json.createReader(reader).readObject(), prototype); } public static <T extends Factory> T objectFromJson(JsonObject json, T prototype) throws ParseException { T object = (T) prototype.create(); Method[] methods = prototype.getClass().getMethods(); 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)) 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, dateFormat.parse(json.getString(name))); } } catch (IllegalAccessException error) { } catch (InvocationTargetException 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.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, dateFormat.format(value)); } } } catch (IllegalAccessException error) { } catch (InvocationTargetException 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(); } }