1 /* 2 * Copyright (c) 2012, 2020, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.internal.loader; 27 28 import java.io.File; 29 30 class ClassLoaderHelper { 31 32 private ClassLoaderHelper() {} 33 34 /** 35 * Returns an alternate path name for the given file 36 * such that if the original pathname did not exist, then the 37 * file may be located at the alternate location. 38 * For most platforms, this behavior is not supported and returns null. 39 */ 40 static File mapAlternativeName(File lib) { 41 return null; 42 } 43 44 /** 45 * Parse a PATH env variable. Windows allows quoted elements in a PATH, 46 * so special care needs to be taken. 47 * 48 * Empty elements will be replaced by dot. 49 */ 50 static String[] parsePath(String ldPath) { 51 int ldLen = ldPath.length(); 52 char ps = File.pathSeparatorChar; 53 int psCount = 0; 54 55 if (ldPath.indexOf('\"') >= 0) { 56 // First, remove quotes put around quoted parts of paths. 57 // Second, use a quotation mark as a new path separator. 58 // This will preserve any quoted old path separators. 59 char[] buf = new char[ldLen]; 60 int bufLen = 0; 61 for (int i = 0; i < ldLen; ++i) { 62 char ch = ldPath.charAt(i); 63 if (ch == '\"') { 64 while (++i < ldLen && 65 (ch = ldPath.charAt(i)) != '\"') { 66 buf[bufLen++] = ch; 67 } 68 } else { 69 if (ch == ps) { 70 psCount++; 71 ch = '\"'; 72 } 73 buf[bufLen++] = ch; 74 } 75 } 76 ldPath = new String(buf, 0, bufLen); 77 ldLen = bufLen; 78 ps = '\"'; 79 } else { 80 for (int i = ldPath.indexOf(ps); i >= 0; 81 i = ldPath.indexOf(ps, i + 1)) { 82 psCount++; 83 } 84 } 85 86 String[] paths = new String[psCount + 1]; 87 int pathStart = 0; 88 for (int j = 0; j < psCount; ++j) { 89 int pathEnd = ldPath.indexOf(ps, pathStart); 90 paths[j] = (pathStart < pathEnd) ? 91 ldPath.substring(pathStart, pathEnd) : "."; 92 pathStart = pathEnd + 1; 93 } 94 paths[psCount] = (pathStart < ldLen) ? 95 ldPath.substring(pathStart, ldLen) : "."; 96 return paths; 97 } 98 }