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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package sun.security.tools;

import java.io.File;
import java.io.IOException;
import java.lang.String;
import java.util.StringTokenizer;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.MalformedURLException;

A utility class for handle path list
/**
 * A utility class for handle path list
 *
 */
public class PathList {
    
Utility method for appending path from pathFrom to pathTo.
Params:
pathTo – the target path
pathFrom – the path to be appended to pathTo
Returns:
the resulting path/**
     * Utility method for appending path from pathFrom to pathTo.
     *
     * @param pathTo the target path
     * @param pathFrom the path to be appended to pathTo
     * @return the resulting path
     */
    public static String appendPath(String pathTo, String pathFrom) {
        if (pathTo == null || pathTo.length() == 0) {
            return pathFrom;
        } else if (pathFrom == null || pathFrom.length() == 0) {
            return pathTo;
        } else {
            return pathTo  + File.pathSeparator + pathFrom;
        }
    }

    
Utility method for converting a search path string to an array
of directory and JAR file URLs.
Params:
path – the search path string
Returns:
the resulting array of directory and JAR file URLs/**
     * Utility method for converting a search path string to an array
     * of directory and JAR file URLs.
     *
     * @param path the search path string
     * @return the resulting array of directory and JAR file URLs
     */
    public static URL[] pathToURLs(String path) {
        StringTokenizer st = new StringTokenizer(path, File.pathSeparator);
        URL[] urls = new URL[st.countTokens()];
        int count = 0;
        while (st.hasMoreTokens()) {
            URL url = fileToURL(new File(st.nextToken()));
            if (url != null) {
                urls[count++] = url;
            }
        }
        if (urls.length != count) {
            URL[] tmp = new URL[count];
            System.arraycopy(urls, 0, tmp, 0, count);
            urls = tmp;
        }
        return urls;
    }

    
Returns the directory or JAR file URL corresponding to the specified
local file name.
Params:
file – the File object
Returns:
the resulting directory or JAR file URL, or null if unknown/**
     * Returns the directory or JAR file URL corresponding to the specified
     * local file name.
     *
     * @param file the File object
     * @return the resulting directory or JAR file URL, or null if unknown
     */
    private static URL fileToURL(File file) {
        String name;
        try {
            name = file.getCanonicalPath();
        } catch (IOException e) {
            name = file.getAbsolutePath();
        }
        name = name.replace(File.separatorChar, '/');
        if (!name.startsWith("/")) {
            name = "/" + name;
        }
        // If the file does not exist, then assume that it's a directory
        if (!file.isFile()) {
            name = name + "/";
        }
        try {
            return new URL("file", "", name);
        } catch (MalformedURLException e) {
            throw new IllegalArgumentException("file");
        }
    }
}