GsonConf.java

/*******************************************************************************
 * Copyright (C) 2009-2011 Amir Hassan <amir@viel-zu.org>
 * 
 * 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 2 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 should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 ******************************************************************************/
package org.wooden.util;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public abstract class GsonConf {
  private final static Gson gson = createGson();

  public static Object create(File f, Class c) throws IOException,
      GsonConfException {
    FileReader fr = new FileReader(f);
    GsonConf conf = (GsonConf) gson.fromJson(fr, c);
    fr.close();
    conf.check();
    return conf;
  }

  private static Gson createGson() {
    GsonBuilder gb = new GsonBuilder();
    gb.serializeNulls();
    gb.setPrettyPrinting();
    return gb.create();
  }

  public abstract void check() throws GsonConfException;

  public void save(File f) throws IOException, RuntimeException {
    this.check();
    FileWriter fr = new FileWriter(f);
    gson.toJson(this, this.getClass(), fr);
    fr.close();
  }
}