Loader.java

/*************************************************************************************************
 * Java binding of Kyoto Cabinet. Copyright (C) 2009-2011 FAL Labs This file is part of Kyoto Cabinet. 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 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, see
 * <http://www.gnu.org/licenses/>.
 *************************************************************************************************/

package kyotocabinet;

import java.io.File;
import java.io.IOException;
import java.net.URL;

import org.apache.commons.io.FileUtils;

/**
 * Library loader.
 */
class Loader {

    // ----------------------------------------------------------------
    // package static methods
    // ----------------------------------------------------------------
    /**
     * Load the native library.
     */
    static synchronized void load() {
        if (loaded) {
            return;
        }
        String lib = System.mapLibraryName("jkyotocabinet");
        if (lib.endsWith(".dll")) {
            // 从指定目录装载lib，限制lib的装载范围，便于调试。
            URL url = Loader.class.getClassLoader().getResource(System.mapLibraryName("jkyotocabinet"));
            String libFileName = "./temp" + File.separatorChar + System.mapLibraryName("jkyotocabinet");
            File file = new File(libFileName);
            try {
                FileUtils.copyURLToFile(url, file);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            System.load(file.getAbsolutePath());
        } else {
            System.loadLibrary("jkyotocabinet");
        }
        loaded = true;
    }

    // ----------------------------------------------------------------
    // static private fields
    // ----------------------------------------------------------------
    /** The flag whether loaded. */
    static private boolean loaded = false;

    // ----------------------------------------------------------------
    // private methods
    // ----------------------------------------------------------------
    /**
     * Dummy constructor.
     */
    private Loader() {
    }
}

/* END OF FILE */