Glassfish example source code file (GFLauncherUtils.java)

This example Glassfish source code file (GFLauncherUtils.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

arraylist, exception, file, file, gflauncherutils, gflauncherutils, io, jarurlconnection, list, net, network, string, string, stringbuilder, stringbuilder, unknownhostexception, url, util

The Glassfish GFLauncherUtils.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2010 Oracle and/or its affiliates. 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_1_1.html
 * or packager/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [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.universal.glassfish;

import com.sun.enterprise.util.net.NetUtils;
import static com.sun.enterprise.util.SystemPropertyConstants.*;
import com.sun.enterprise.universal.io.SmartFile;
import java.io.*;
import java.net.*;
import java.util.*;

/**
 * Package private static utility methods
 * @author bnevins
 */
public class GFLauncherUtils {

    private GFLauncherUtils() {
    // all static methods
    }

    public static boolean ok(String s) {
        return s != null && s.length() > 0;
    }

    public static boolean safeExists(File f) {
        return f != null && f.exists();
    }

    public static boolean safeIsDirectory(File f) {
        return f != null && f.isDirectory();
    }

    public static synchronized File getInstallDir() {
        // if it is already set as a System Property -- skip the huge block below
        setInstallDirFromSystemProp();

        if(installDir == null)
        {
            String resourceName = GFLauncherUtils.class.getName().replace('.', '/') + ".class";
            URL resource = GFLauncherUtils.class.getClassLoader().getResource(resourceName);

            if (resource == null) {
                return null;
            }

            if (!resource.getProtocol().equals("jar")) {
                return null;
            }

            try {
                JarURLConnection c = (JarURLConnection) resource.openConnection();
                URL jarFile = c.getJarFileURL();
                
                // important to sanitize it!
                // unreported bug:
                // JDK does this:
                // the parent of "/foo/." is "/foo", not "/" !
               
                
                File f = SmartFile.sanitize(new File(jarFile.toURI()));

                f = f.getParentFile();  // <install>/modules

                if (f == null) {
                    return null;
                }

                f = f.getParentFile(); // <install>/

                if (f == null) {
                    return null;
                }

                installDir = SmartFile.sanitize(f);
            }
            catch (Exception e) {
                installDir = null;
            }
        }
        return installDir;
    }

    public static boolean isWindows() {
        String osname = System.getProperty("os.name");

        if (osname == null || osname.length() <= 0) {
            return false;
        }

        // case insensitive compare...
        osname = osname.toLowerCase();

        if (osname.indexOf("windows") >= 0) {
            return true;
        }

        return false;
    }

    /**
     * This method returns the fully qualified name of the host.  If
     * the name can't be resolved (on windows if there isn't a domain specified), just 
     * host name is returned
     *
     * @deprecated
     * @return 
     * @throws UnknownHostException so it can be handled on a case by case basis
     */
    @Deprecated
    public static String getCanonicalHostName() throws UnknownHostException {
        return NetUtils.getCanonicalHostName();
    }

    public static String replace(String s, String token, String replace) {
        if (s == null || s.length() <= 0 || token == null || token.length() <= 0) {
            return s;
        }

        int index = s.indexOf(token);

        if (index < 0) {
            return s;
        }

        int tokenLength = token.length();
        String ret = s.substring(0, index);
        ret += replace;
        ret += s.substring(index + tokenLength);

        return ret;
    }

    /**
     * Makes an educated guess on whether an arbitrary string is a relative path.
     * If the string really is a path, it should be 100% accurate.
     * If it is an arbitrary string like, say, "hello/./world", then it will say
     * that it is a relative path.
     * @param path the path to check
     * @return true if the path is probably relative
     */
    public static boolean isRelativePath(String path) {
        if (!ok(path)) {
            return false;
        }
        else if (path.startsWith(".")) {
            return true;
        }
        else if (path.indexOf("/.") >= 0) {
            return true;
        }
        else if (path.indexOf("\\.") >= 0) {
            return true;
        }
        else {
            return false;
        }
    }

    /**
     * Convert a classpath like string, e.g. c:/a;c:/b, and convert to List of File
     * @param cp The classpath-like string
     * @return the list of File
     */
    public static List<File> stringToFiles(String cp)
    {
        List<File> list = new ArrayList();

        if(ok(cp)) {
            cp = SmartFile.sanitizePaths(cp);
            String[] ss = cp.split(File.pathSeparator);

            for(String s : ss)
                list.add(new File(s));
        }
        
        return list;
    }
    
    public static String fileListToPathString(List<File> files) {
        StringBuilder sb = new StringBuilder();
        boolean firstFile = true;

        for (File f : files) {
            if(firstFile) {
                firstFile = false;
            }
            else {
                sb.append(File.pathSeparatorChar);
            }
            // let's use forward slashes for neatness...
            sb.append(f.getPath().replace('\\', '/'));
        }
        return sb.toString();
    }

    private static void setInstallDirFromSystemProp() {
        // https://embedded-glassfish.dev.java.net/issues/show_bug.cgi?id=54
        //
        // For instance if we are called from an Embedded Server then InstallRoot
        // may already be set as a System Prop -- and the jar we are running from has
        // nothing whatever to do with the concept of an "install root".
        // In that case we certainly do not want to wipe out the already set install root.

        // if anything is not kosher simply return w/o setting installDir to anything.
        String installRootDirName = System.getProperty(INSTALL_ROOT_PROPERTY);

        if(!ok(installRootDirName))
            return;

        File f = SmartFile.sanitize(new File(installRootDirName));

        if(f.isDirectory()) {
            installDir = f;
        }
    }

    private static File installDir;
}