de.hackerspacebremen.commands.WebCommand.java Source code

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Here is the source code for de.hackerspacebremen.commands.WebCommand.java

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/*
 * ljal - Java App Engine library
 * 
 * Copyright (C) 2012 Steve Liedtke <sliedtke57@gmail.com>
 * 
 * This program is free software; you can redistribute it and/or modify it under the terms of the 
 * GNU General Public License as published by the Free Software Foundation; either version 3 of 
 * the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 
 * the GNU General Public License for more details.
 * 
 * You can find a copy of the GNU General Public License on http://www.gnu.org/licenses/gpl.html.
 * 
 * Contributors:
 *     Steve Liedtke <sliedtke57@gmail.com>
 */
package de.hackerspacebremen.commands;

import java.io.IOException;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import lombok.NonNull;

import org.json.JSONObject;

import com.google.inject.Inject;
import com.googlecode.objectify.ObjectifyService;

import de.hackerspacebremen.commands.resultobjects.BasicResultObject;
import de.hackerspacebremen.domain.val.ValidationException;
import de.hackerspacebremen.format.ResultKind;
import de.hackerspacebremen.util.ErrorMessages;
import de.hackerspacebremen.util.Result;

public abstract class WebCommand {

    /**
     * static attribute used for logging.
     */
    private static final Logger logger = Logger.getLogger(WebCommand.class.getName());

    protected HttpServletRequest req;

    protected HttpServletResponse resp;

    protected JSONObject json;

    protected Result result;

    @Inject
    protected ErrorMessages errorMessages;

    public <T extends ErrorMessages> void init(@NonNull final HttpServletRequest req,
            @NonNull final HttpServletResponse resp, final Class<T> errorMessageClass) {
        final ResultKind kind = ResultKind.find(req.getParameter("format"));
        this.result = new Result(kind, errorMessages);
        this.req = req;
        this.resp = resp;
    }

    protected void handleError(ValidationException ve) {
        this.handleError(ve.getErrorCode());
    }

    protected void handleError(final int errorCode) {
        resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
        result.addError(errorCode);
    }

    protected void handleSuccess(final BasicResultObject result) {
        resp.setStatus(HttpServletResponse.SC_OK);
        this.result.addSuccess(result);
    }

    //   @Deprecated
    //   protected void handleSuccess(final String message, final String result) {
    //      resp.setStatus(HttpServletResponse.SC_OK);
    //      this.result.addSuccess(message);
    //      if (result != null)
    //         this.result.addResult(result);
    //   }

    public void process() throws ServletException, IOException {
        resp.setHeader("Content-Type", "text/javascript; charset=UTF-8");
        resp.setCharacterEncoding("UTF-8");
        final String res = this.result.toString();
        resp.getWriter().append(res);
        logger.info(res);
        ObjectifyService.ofy().clear();
    }
}