la.alsocan.symbiot.access.DriverDao.java Source code

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Here is the source code for la.alsocan.symbiot.access.DriverDao.java

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/*
 * The MIT License
 *
 * Copyright 2014 Florian Poulin - https://github.com/fpoulin.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package la.alsocan.symbiot.access;

import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import la.alsocan.symbiot.api.to.drivers.DriverTo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Florian Poulin - https://github.com/fpoulin
 */
public class DriverDao {

    private Logger LOG = LoggerFactory.getLogger(DriverDao.class);
    private static final String DRIVER_FOLDER_NAME = "drivers";
    private final Map<String, DriverTo> drivers;

    public DriverDao(ObjectMapper om) {

        // open drivers folder
        String jarFolder;
        try {
            URL url = getClass().getProtectionDomain().getCodeSource().getLocation();
            File jarFile = new File(url.toURI());
            jarFolder = jarFile.getParentFile().getPath();
        } catch (URISyntaxException ex) {
            jarFolder = "<unable to resolve>";
        }
        String driverFolderPath = jarFolder + File.separatorChar + DRIVER_FOLDER_NAME;
        File folder = new File(driverFolderPath);
        if (!folder.exists() || !folder.isDirectory()) {
            throw new IllegalStateException("Could not find folder '" + driverFolderPath + "'");
        }

        // load drivers in memory
        drivers = new LinkedHashMap<>();
        for (File file : folder.listFiles((File dir, String name) -> {
            return name.endsWith(".json");
        })) {
            DriverTo to;
            try {
                to = om.readValue(file, DriverTo.class);
                if (!drivers.containsKey(to.getId())) {
                    drivers.put(to.getId(), to);
                } else {
                    LOG.warn("The driver file '" + file.getName() + "' uses a conflicting ID '" + to.getId() + "'");
                    LOG.info("Check driver with name '" + drivers.get(to.getId()).getName()
                            + "' to resolve conflict");
                    LOG.info("Driver file '" + file.getName() + "' will not be loaded");
                }
            } catch (IOException ex) {
                LOG.warn("Malformed driver '" + file.getName() + "': " + ex.getMessage());
                LOG.info("Driver '" + file.getName() + "' will not be loaded");
            }
        }
    }

    public List<DriverTo> findAll() {
        return new LinkedList<>(drivers.values());
    }

    public DriverTo findById(String id) {
        return drivers.get(id);
    }
}