| /* |
| * Copyright (c) 2008, 2009, 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 sun.nio.fs; |
| |
| import java.nio.file.InvalidPathException; |
| |
| /** |
| * A parser of Windows path strings |
| */ |
| |
| class WindowsPathParser { |
| private WindowsPathParser() { } |
| |
| /** |
| * The result of a parse operation |
| */ |
| static class Result { |
| private final WindowsPathType type; |
| private final String root; |
| private final String path; |
| |
| Result(WindowsPathType type, String root, String path) { |
| this.type = type; |
| this.root = root; |
| this.path = path; |
| } |
| |
| /** |
| * The path type |
| */ |
| WindowsPathType type() { |
| return type; |
| } |
| |
| /** |
| * The root component |
| */ |
| String root() { |
| return root; |
| } |
| |
| /** |
| * The normalized path (includes root) |
| */ |
| String path() { |
| return path; |
| } |
| } |
| |
| /** |
| * Parses the given input as a Windows path |
| */ |
| static Result parse(String input) { |
| if (input == null || input.length() == 0) |
| throw new InvalidPathException(input, "Empty or null path"); |
| return parse(input, true); |
| } |
| |
| /** |
| * Parses the given input as a Windows path where it is known that the |
| * path is already normalized. |
| */ |
| static Result parseNormalizedPath(String input) { |
| return parse(input, false); |
| } |
| |
| /** |
| * Parses the given input as a Windows path. |
| * |
| * @param requireToNormalize |
| * Indicates if the path requires to be normalized |
| */ |
| private static Result parse(String input, boolean requireToNormalize) { |
| String root = ""; |
| WindowsPathType type = null; |
| |
| int len = input.length(); |
| int off = 0; |
| if (len > 1) { |
| char c0 = input.charAt(0); |
| char c1 = input.charAt(1); |
| char c = 0; |
| int next = 2; |
| if (isSlash(c0) && isSlash(c1)) { |
| // UNC: We keep the first two slash, collapse all the |
| // following, then take the hostname and share name out, |
| // meanwhile collapsing all the redundant slashes. |
| type = WindowsPathType.UNC; |
| off = nextNonSlash(input, next, len); |
| next = nextSlash(input, off, len); |
| if (off == next) |
| throw new InvalidPathException(input, "UNC path is missing hostname"); |
| String host = input.substring(off, next); //host |
| off = nextNonSlash(input, next, len); |
| next = nextSlash(input, off, len); |
| if (off == next) |
| throw new InvalidPathException(input, "UNC path is missing sharename"); |
| root = "\\\\" + host + "\\" + input.substring(off, next) + "\\"; |
| off = next; |
| } else { |
| if (isLetter(c0) && c1 == ':') { |
| root = input.substring(0, 2); |
| if (len > 2 && isSlash(input.charAt(2))) { |
| off = 3; |
| root += "\\"; |
| type = WindowsPathType.ABSOLUTE; |
| } else { |
| off = 2; |
| type = WindowsPathType.DRIVE_RELATIVE; |
| } |
| } |
| } |
| } |
| if (off == 0) { |
| if (isSlash(input.charAt(0))) { |
| type = WindowsPathType.DIRECTORY_RELATIVE; |
| root = "\\"; |
| } else { |
| type = WindowsPathType.RELATIVE; |
| } |
| } |
| |
| if (requireToNormalize) { |
| StringBuilder sb = new StringBuilder(input.length()); |
| sb.append(root); |
| return new Result(type, root, normalize(sb, input, off)); |
| } else { |
| return new Result(type, root, input); |
| } |
| } |
| |
| /** |
| * Remove redundant slashes from the rest of the path, forcing all slashes |
| * into the preferred slash. |
| */ |
| private static String normalize(StringBuilder sb, String path, int off) { |
| int len = path.length(); |
| off = nextNonSlash(path, off, len); |
| int start = off; |
| char lastC = 0; |
| while (off < len) { |
| char c = path.charAt(off); |
| if (isSlash(c)) { |
| if (lastC == ' ') |
| throw new InvalidPathException(path, |
| "Trailing char <" + lastC + ">", |
| off - 1); |
| sb.append(path, start, off); |
| off = nextNonSlash(path, off, len); |
| if (off != len) //no slash at the end of normalized path |
| sb.append('\\'); |
| start = off; |
| } else { |
| if (isInvalidPathChar(c)) |
| throw new InvalidPathException(path, |
| "Illegal char <" + c + ">", |
| off); |
| lastC = c; |
| off++; |
| } |
| } |
| if (start != off) { |
| if (lastC == ' ') |
| throw new InvalidPathException(path, |
| "Trailing char <" + lastC + ">", |
| off - 1); |
| sb.append(path, start, off); |
| } |
| return sb.toString(); |
| } |
| |
| private static final boolean isSlash(char c) { |
| return (c == '\\') || (c == '/'); |
| } |
| |
| private static final int nextNonSlash(String path, int off, int end) { |
| while (off < end && isSlash(path.charAt(off))) { off++; } |
| return off; |
| } |
| |
| private static final int nextSlash(String path, int off, int end) { |
| char c; |
| while (off < end && !isSlash(c=path.charAt(off))) { |
| if (isInvalidPathChar(c)) |
| throw new InvalidPathException(path, |
| "Illegal character [" + c + "] in path", |
| off); |
| off++; |
| } |
| return off; |
| } |
| |
| private static final boolean isLetter(char c) { |
| return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')); |
| } |
| |
| // Reserved characters for window path name |
| private static final String reservedChars = "<>:\"|?*"; |
| private static final boolean isInvalidPathChar(char ch) { |
| return ch < '\u0020' || reservedChars.indexOf(ch) != -1; |
| } |
| } |