at.uni_salzburg.cs.ckgroup.cscpp.mapper.registry.RegistryPersistence.java Source code

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Here is the source code for at.uni_salzburg.cs.ckgroup.cscpp.mapper.registry.RegistryPersistence.java

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/*
 * @(#) RegistryPersistence.java
 *
 * This code is part of the JNavigator project.
 * Copyright (c) 2012  Clemens Krainer
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package at.uni_salzburg.cs.ckgroup.cscpp.mapper.registry;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.log4j.Logger;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import at.uni_salzburg.cs.ckgroup.cpcc.mapper.api.IRegistrationData;
import at.uni_salzburg.cs.ckgroup.cscpp.mapper.RegData;
import at.uni_salzburg.cs.ckgroup.cscpp.utils.FileUtils;

public class RegistryPersistence {

    private static final Logger LOG = Logger.getLogger(RegistryPersistence.class);

    private static final Object lock = new Object();
    private static final JSONParser parser = new JSONParser();

    @SuppressWarnings("unchecked")
    public static void loadRegistry(File registryFile, Map<String, IRegistrationData> registrationData)
            throws IOException {
        synchronized (lock) {
            String reg = FileUtils.loadFileAsString(registryFile);
            if (reg == null || reg.isEmpty()) {
                LOG.info("Can not load registry, because of empty or missing file " + registryFile);
                return;
            }

            List<Object> list;
            try {
                list = (List<Object>) parser.parse(reg);
            } catch (ParseException e) {
                throw new IOException("Parsing " + registryFile.getAbsolutePath() + " failed", e);
            }

            int counter = 0;
            for (Object entry : list) {
                RegData rd = new RegData((JSONObject) entry);
                registrationData.put(rd.getEngineUrl(), rd);
                ++counter;
            }
            LOG.info(counter + " Registry entries successfully loaded from file " + registryFile);
        }
    }

    @SuppressWarnings("unchecked")
    public static void storeRegistry(File registryFile, Map<String, IRegistrationData> registrationData)
            throws IOException {
        synchronized (lock) {
            JSONArray obj = new JSONArray();
            for (Entry<String, IRegistrationData> entry : registrationData.entrySet()) {
                IRegistrationData rd = entry.getValue();
                obj.add(rd);
            }

            PrintWriter pw = new PrintWriter(registryFile);
            pw.print(obj.toString());
            pw.close();
            LOG.info("Registry successfully saved to file " + registryFile);
        }
    }

}