URLClassLoader/closetest/Common.java

/*
 * 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;
    }
}