test/hotspot/jtreg/vmTestbase/nsk/share/ClassFileFinder.java

/*
 * Copyright (c) 2018, 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.
 */

package nsk.share;

import java.io.File;
import java.nio.file.Paths;
import java.nio.file.Path;
import java.nio.file.Files;
import java.util.Arrays;

public class ClassFileFinder {
    private ClassFileFinder() { }
    /**
     * Searches for a classfile for the specified class in the specified
     * classpath.
     *
     * @param name a classname
     * @param classPath @{link File.pathSeparator} separated directories
     * @return an absolute path to the found classfile, or null if it cannot be
     *         found
     */
    public static Path findClassFile(String name, String classPath) {
        return Arrays.stream(classPath.split(File.pathSeparator))
                     .map(java.nio.file.Paths::get)
                     .map(p -> p.resolve(name.replace('.', File.separatorChar) + ".class"))
                     .filter(p -> java.nio.file.Files.exists(p))
                     .map(Path::toAbsolutePath)
                     .findAny()
                     .orElse(null);
    }
}