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/*
* 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> T enumObjectFromJson(Reader reader, EnumFactory<? extends Enum<?>> factory) throws ParseException {
JsonObject json = Json.createReader(reader).readObject();
T object = factory.<T>create(json);
populateObject(json, object);
return object;
}
public static <T extends Factory> T objectFromJson(JsonObject json, T prototype) throws ParseException {
T object = (T) prototype.create();
populateObject(json, object);
return object;
}
private static void populateObject(JsonObject json, Object object) throws ParseException {
Method[] methods = object.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)));
} else if (parameterType.isEnum()) {
method.invoke(object, Enum.valueOf((Class<? extends Enum>) parameterType, json.getString(name)));
} else {
Object nestedObject = parameterType.newInstance();
populateObject(json.getJsonObject(name), nestedObject);
method.invoke(object, nestedObject);
}
} catch (IllegalAccessException error) {
} catch (InvocationTargetException error) {
} catch (InstantiationException e) {
}
}
}
}
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, 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();
}
}
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