com.sun.enterprise.admin.cli.DirectoryClassLoader Maven / Gradle / Ivy

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 *
 * Contributor(s):
 *
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.enterprise.admin.cli;

import java.io.*;
import java.net.*;
import java.util.*;

import com.sun.enterprise.universal.i18n.LocalStringsImpl;

/**
 * A class loader that loads classes from all jar files
 * in a specified directory.
 */
public class DirectoryClassLoader extends URLClassLoader {
    private static final LocalStringsImpl strings =
            new LocalStringsImpl(DirectoryClassLoader.class);

    /**
     * Create a DirectoryClassLoader to load from jar files in
     * the specified directory, with the specified parent class loader.
     *
     * @param dir the directory of jar files to load from
     * @param parent the parent class loader
     * @throws IOException if the directory can't be accessed
     */
    public DirectoryClassLoader(String dir, ClassLoader parent)
                        throws IOException {
        super(getJars(new File(dir)), parent);
    }

    /**
     * Create a DirectoryClassLoader to load from jar files in
     * the specified directory, with the specified parent class loader.
     *
     * @param dir the directory of jar files to load from
     * @param parent the parent class loader
     * @throws IOException if the directory can't be accessed
     */
    public DirectoryClassLoader(File dir, ClassLoader parent)
                        throws IOException {
        super(getJars(dir), parent);
    }

    private static URL[] getJars(File dir) throws IOException {
        File[] fjars = dir.listFiles(new FilenameFilter() {
            public boolean accept(File dir, String name) {
                return name.endsWith(".jar");
            }
        });
        if (fjars == null)
            throw new IOException(strings.get("DirError", dir));
        URL[] jars = new URL[fjars.length];
        for (int i = 0; i < fjars.length; i++)
            jars[i] = fjars[i].toURI().toURL();
        return jars;
    }
}