test/hotspot/jtreg/vmTestbase/nsk/share/classload/ClassLoadUtils.java
changeset 50220 31361382634b
equal deleted inserted replaced
50219:4ab066d71956 50220:31361382634b
       
     1 /*
       
     2  * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
       
     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
       
     4  *
       
     5  * This code is free software; you can redistribute it and/or modify it
       
     6  * under the terms of the GNU General Public License version 2 only, as
       
     7  * published by the Free Software Foundation.
       
     8  *
       
     9  * This code is distributed in the hope that it will be useful, but WITHOUT
       
    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
       
    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
       
    12  * version 2 for more details (a copy is included in the LICENSE file that
       
    13  * accompanied this code).
       
    14  *
       
    15  * You should have received a copy of the GNU General Public License version
       
    16  * 2 along with this work; if not, write to the Free Software Foundation,
       
    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
       
    18  *
       
    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
       
    20  * or visit www.oracle.com if you need additional information or have any
       
    21  * questions.
       
    22  */
       
    23 
       
    24 package nsk.share.classload;
       
    25 
       
    26 import java.io.File;
       
    27 import java.io.IOException;
       
    28 import java.io.InputStream;
       
    29 import java.io.FileInputStream;
       
    30 
       
    31 import java.util.Arrays;
       
    32 import java.nio.file.Path;
       
    33 import java.nio.file.Paths;
       
    34 import java.nio.file.Files;
       
    35 
       
    36 public class ClassLoadUtils {
       
    37     private ClassLoadUtils() {
       
    38     }
       
    39 
       
    40     /**
       
    41      * Get filename of class file from classpath for given class name.
       
    42      *
       
    43      * @param className class name
       
    44      * @return filename or null if not found
       
    45      */
       
    46     public static String getClassPath(String className) {
       
    47         String fileName = className.replace(".", File.separator) + ".class";
       
    48         String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator);
       
    49         File target = null;
       
    50         int i;
       
    51         for (i = 0; i < classPath.length; ++i) {
       
    52             target = new File(classPath[i] + File.separator + fileName);
       
    53             System.out.println("Try: " + target);
       
    54             if (target.exists()) {
       
    55                 break;
       
    56             }
       
    57         }
       
    58         if (i != classPath.length) {
       
    59             return classPath[i];
       
    60         }
       
    61         return null;
       
    62     }
       
    63 
       
    64     /**
       
    65      * Get filename of class file from classpath for given class name.
       
    66      *
       
    67      * @param className class name
       
    68      * @return filename or null if not found
       
    69      */
       
    70     public static String getClassPathFileName(String className) {
       
    71         String fileName = className.replace(".", File.separator) + ".class";
       
    72         String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator);
       
    73         File target = null;
       
    74         int i;
       
    75         for (i = 0; i < classPath.length; ++i) {
       
    76             target = new File(classPath[i] + File.separator + fileName);
       
    77             System.out.println("Try: " + target);
       
    78             if (target.exists()) {
       
    79                 break;
       
    80             }
       
    81         }
       
    82         if (i != classPath.length) {
       
    83             try {
       
    84                 return target.getCanonicalPath();
       
    85             } catch (IOException e) {
       
    86                 return null;
       
    87             }
       
    88         }
       
    89         return null;
       
    90     }
       
    91 
       
    92     public static String getRedefineClassFileName(String dir, String className) {
       
    93         String fileName = className.replace(".", File.separator) + ".class";
       
    94         return Arrays.stream(System.getProperty("java.class.path").split(File.pathSeparator))
       
    95                      .map(Paths::get)
       
    96                      .map(p -> p.resolve(dir))
       
    97                      .map(p -> p.resolve(fileName))
       
    98                      .filter(p -> Files.exists(p))
       
    99                      .map(Path::toAbsolutePath)
       
   100                      .map(Path::toString)
       
   101                      .findAny()
       
   102                      .orElse(null);
       
   103     }
       
   104 
       
   105     /**
       
   106      * Get filename of class file which is to be redefined.
       
   107      */
       
   108     public static String getRedefineClassFileName(String className) {
       
   109             return getRedefineClassFileName("newclass", className);
       
   110     }
       
   111 }