112 lines
3.9 KiB
Java
112 lines
3.9 KiB
Java
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package nsk.share.classload;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.FileInputStream;
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import java.util.Arrays;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.Files;
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public class ClassLoadUtils {
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private ClassLoadUtils() {
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}
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/**
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* Get filename of class file from classpath for given class name.
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*
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* @param className class name
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* @return filename or null if not found
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*/
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public static String getClassPath(String className) {
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String fileName = className.replace(".", File.separator) + ".class";
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String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator);
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File target = null;
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int i;
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for (i = 0; i < classPath.length; ++i) {
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target = new File(classPath[i] + File.separator + fileName);
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System.out.println("Try: " + target);
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if (target.exists()) {
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break;
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}
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}
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if (i != classPath.length) {
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return classPath[i];
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}
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return null;
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}
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/**
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* Get filename of class file from classpath for given class name.
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*
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* @param className class name
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* @return filename or null if not found
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*/
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public static String getClassPathFileName(String className) {
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String fileName = className.replace(".", File.separator) + ".class";
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String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator);
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File target = null;
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int i;
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for (i = 0; i < classPath.length; ++i) {
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target = new File(classPath[i] + File.separator + fileName);
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System.out.println("Try: " + target);
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if (target.exists()) {
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break;
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}
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}
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if (i != classPath.length) {
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try {
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return target.getCanonicalPath();
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} catch (IOException e) {
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return null;
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}
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}
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return null;
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}
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public static String getRedefineClassFileName(String dir, String className) {
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String fileName = className.replace(".", File.separator) + ".class";
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return Arrays.stream(System.getProperty("java.class.path").split(File.pathSeparator))
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.map(Paths::get)
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.map(p -> p.resolve(dir))
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.map(p -> p.resolve(fileName))
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.filter(p -> Files.exists(p))
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.map(Path::toAbsolutePath)
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.map(Path::toString)
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.findAny()
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.orElse(null);
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}
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/**
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* Get filename of class file which is to be redefined.
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*/
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public static String getRedefineClassFileName(String className) {
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return getRedefineClassFileName("newclass", className);
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}
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}
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