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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.web;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.traccar.Context;
import org.traccar.helper.CommandCall;
import org.traccar.helper.Clazz;
/**
*
* @author Rafael
*/
public abstract class BaseServletResource<T> extends BaseServlet {
private final Class<T> clazz = Clazz.getGenericArgumentType(getClass());
public static final String GET = "GET";
public static final String POST = "POST";
public static final String PUT = "PUT";
public static final String DELETE = "DELETE";
public static final String PATH_PARAM_ID = "/\\d";
public static final String SLASH = "/";
public static final String VOID = "";
@Override
protected String getCommand(HttpServletRequest req) {
String command = req.getPathInfo();
if (command == null || command.matches(PATH_PARAM_ID)) {
switch (req.getMethod()) {
case GET:
command = "/get";
break;
case POST:
command = "/add";
break;
case PUT:
command = "/update";
break;
case DELETE:
command = "/remove";
break;
default:
command = "";
}
}
return command;
}
protected String getPathParamId(String pathInfo) {
if (pathInfo != null && pathInfo.matches(PATH_PARAM_ID)) {
return pathInfo.replaceAll(SLASH, VOID);
}
return null;
}
protected abstract void get(HttpServletRequest req, HttpServletResponse resp) throws Exception;
protected void add(HttpServletRequest req, HttpServletResponse resp) throws Exception {
add(req, resp, null);
}
protected void update(HttpServletRequest req, HttpServletResponse resp) throws Exception {
update(req, resp, null);
}
protected void remove(HttpServletRequest req, HttpServletResponse resp) throws Exception {
remove(req, resp, null);
}
protected void add(HttpServletRequest req, HttpServletResponse resp, CommandCall<T> commandCall) throws Exception {
if (commandCall != null) {
commandCall.before();
}
T entity = JsonConverter.objectFromJson(req.getReader(), this.clazz);
long userId = getUserId(req);
if (commandCall != null) {
commandCall.setUserId(userId);
commandCall.setEntity(entity);
commandCall.check();
}
Context.getDataManager().add(entity);
long entityId = Clazz.getId(entity);
Context.getDataManager().link(this.clazz, userId, entityId);
if (commandCall != null) {
commandCall.after();
}
sendResponse(resp.getWriter(), JsonConverter.objectToJson(entity));
}
protected void update(HttpServletRequest req, HttpServletResponse resp,
CommandCall<T> commandCall) throws Exception {
if (commandCall != null) {
commandCall.before();
}
T entity = JsonConverter.objectFromJson(req.getReader(), this.clazz);
String entityId = getPathParamId(req.getPathInfo());
if (entityId != null) {
Clazz.setId(entity, Long.parseLong(entityId));
}
long userId = getUserId(req);
if (commandCall != null) {
commandCall.setUserId(userId);
commandCall.setEntity(entity);
commandCall.check();
}
Context.getDataManager().update(entity);
if (commandCall != null) {
commandCall.after();
}
sendResponse(resp.getWriter(), true);
}
protected void remove(HttpServletRequest req, HttpServletResponse resp,
CommandCall<T> commandCall) throws Exception {
if (commandCall != null) {
commandCall.before();
}
T entity = Clazz.newInstance(this.clazz);
String entityId = getPathParamId(req.getPathInfo());
if (entityId != null) {
Clazz.setId(entity, Long.parseLong(entityId));
} else {
entity = JsonConverter.objectFromJson(req.getReader(), this.clazz);
}
long userId = getUserId(req);
if (commandCall != null) {
commandCall.setUserId(userId);
commandCall.setEntity(entity);
commandCall.check();
}
Context.getDataManager().remove(entity);
if (commandCall != null) {
commandCall.after();
}
sendResponse(resp.getWriter(), true);
}
}
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