/*

 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.*;

import java.net.*;

public class Common {

    static void copyFile (String src, String dst) {

        copyFile (new File(src), new File(dst));

    }

    static void copyDir (String src, String dst) {

        copyDir (new File(src), new File(dst));

    }

    static void copyFile (File src, File dst) {

        try {

            if (!src.isFile()) {

                throw new RuntimeException ("File not found: " + src.toString());

            }

            dst.delete();

            dst.createNewFile();

            FileInputStream i = new FileInputStream (src);

            FileOutputStream o = new FileOutputStream (dst);

            byte[] buf = new byte [1024];

            int count;

            while ((count=i.read(buf)) >= 0) {

                o.write (buf, 0, count);

            }

            i.close();

            o.close();

        } catch (IOException e) {

            throw new RuntimeException (e);

        }

    }

    static void rm_minus_rf (File path) {

        if (!path.exists()) {

            return;

        }

        if (path.isFile()) {

            if (!path.delete()) {

                throw new RuntimeException ("Could not delete " + path);

            }

        } else if (path.isDirectory ()) {

            String[] names = path.list();

            File[] files = path.listFiles();

            for (int i=0; i<files.length; i++) {

                rm_minus_rf (new File(path, names[i]));

            }

            if (!path.delete()) {

                throw new RuntimeException ("Could not delete " + path);

            }

        } else {

            throw new RuntimeException ("Trying to delete something that isn't a file or a directory");

        }

    }

    static void copyDir (File src, File dst) {

        if (!src.isDirectory()) {

            throw new RuntimeException ("Dir not found: " + src.toString());

        }

        if (dst.exists()) {

            throw new RuntimeException ("Dir exists: " + dst.toString());

        }

        dst.mkdir();

        String[] names = src.list();

        File[] files = src.listFiles();

        for (int i=0; i<files.length; i++) {

            String f = names[i];

            if (files[i].isDirectory()) {

                copyDir (files[i], new File (dst, f));

            } else {

                copyFile (new File (src, f), new File (dst, f));

            }

        }

    }

    /* expect is true if you expect to find it, false if you expect not to */

    static Class loadClass (String name, URLClassLoader loader, boolean expect){

        try {

            Class clazz = Class.forName (name, true, loader);

            if (!expect) {

                throw new RuntimeException ("loadClass: "+name+" unexpected");

            }

            return clazz;

        } catch (ClassNotFoundException e) {

            if (expect) {

                throw new RuntimeException ("loadClass: " +name + " not found");

            }

        }

        return null;

    }

}