/*
 * Copyright (c) 2012, 2020, 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.  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).
 *
 * 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.
 */

package jdk.internal.loader;

import java.io.File;
import java.util.ArrayList;

class ClassLoaderHelper {

    private ClassLoaderHelper() {}

    
Returns an alternate path name for the given file
such that if the original pathname did not exist, then the
file may be located at the alternate location.
For most platforms, this behavior is not supported and returns null.
/**
     * Returns an alternate path name for the given file
     * such that if the original pathname did not exist, then the
     * file may be located at the alternate location.
     * For most platforms, this behavior is not supported and returns null.
     */
    static File mapAlternativeName(File lib) {
        return null;
    }

    
Parse a PATH env variable.
Empty elements will be replaced by dot.
/**
     * Parse a PATH env variable.
     *
     * Empty elements will be replaced by dot.
     */
    static String[] parsePath(String ldPath) {
        char ps = File.pathSeparatorChar;
        ArrayList<String> paths = new ArrayList<>();
        int pathStart = 0;
        int pathEnd;
        while ((pathEnd = ldPath.indexOf(ps, pathStart)) >= 0) {
            paths.add((pathStart < pathEnd) ?
                    ldPath.substring(pathStart, pathEnd) : ".");
            pathStart = pathEnd + 1;
        }
        int ldLen = ldPath.length();
        paths.add((pathStart < ldLen) ?
                ldPath.substring(pathStart, ldLen) : ".");
        return paths.toArray(new String[paths.size()]);
    }
}