| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.google.dart.compiler.util.apache; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Stack; |
| |
| /** |
| * General filename and filepath manipulation utilities. |
| * <p> |
| * When dealing with filenames you can hit problems when moving from a Windows |
| * based development machine to a Unix based production machine. |
| * This class aims to help avoid those problems. |
| * <p> |
| * <b>NOTE</b>: You may be able to avoid using this class entirely simply by |
| * using JDK {@link java.io.File File} objects and the two argument constructor |
| * {@link java.io.File#File(java.io.File, java.lang.String) File(File,String)}. |
| * <p> |
| * Most methods on this class are designed to work the same on both Unix and Windows. |
| * Those that don't include 'System', 'Unix' or 'Windows' in their name. |
| * <p> |
| * Most methods recognise both separators (forward and back), and both |
| * sets of prefixes. See the javadoc of each method for details. |
| * <p> |
| * This class defines six components within a filename |
| * (example C:\dev\project\file.txt): |
| * <ul> |
| * <li>the prefix - C:\</li> |
| * <li>the path - dev\project\</li> |
| * <li>the full path - C:\dev\project\</li> |
| * <li>the name - file.txt</li> |
| * <li>the base name - file</li> |
| * <li>the extension - txt</li> |
| * </ul> |
| * Note that this class works best if directory filenames end with a separator. |
| * If you omit the last separator, it is impossible to determine if the filename |
| * corresponds to a file or a directory. As a result, we have chosen to say |
| * it corresponds to a file. |
| * <p> |
| * This class only supports Unix and Windows style names. |
| * Prefixes are matched as follows: |
| * <pre> |
| * Windows: |
| * a\b\c.txt --> "" --> relative |
| * \a\b\c.txt --> "\" --> current drive absolute |
| * C:a\b\c.txt --> "C:" --> drive relative |
| * C:\a\b\c.txt --> "C:\" --> absolute |
| * \\server\a\b\c.txt --> "\\server\" --> UNC |
| * |
| * Unix: |
| * a/b/c.txt --> "" --> relative |
| * /a/b/c.txt --> "/" --> absolute |
| * ~/a/b/c.txt --> "~/" --> current user |
| * ~ --> "~/" --> current user (slash added) |
| * ~user/a/b/c.txt --> "~user/" --> named user |
| * ~user --> "~user/" --> named user (slash added) |
| * </pre> |
| * Both prefix styles are matched always, irrespective of the machine that you are |
| * currently running on. |
| * <p> |
| * Origin of code: Excalibur, Alexandria, Tomcat, Commons-Utils. |
| * |
| * @version $Id: FilenameUtils.java 1307462 2012-03-30 15:13:11Z ggregory $ |
| * @since 1.1 |
| */ |
| public class FilenameUtils { |
| |
| /** |
| * The extension separator character. |
| * @since 1.4 |
| */ |
| public static final char EXTENSION_SEPARATOR = '.'; |
| |
| /** |
| * The extension separator String. |
| * @since 1.4 |
| */ |
| public static final String EXTENSION_SEPARATOR_STR = Character.toString(EXTENSION_SEPARATOR); |
| |
| /** |
| * The Unix separator character. |
| */ |
| private static final char UNIX_SEPARATOR = '/'; |
| |
| /** |
| * The Windows separator character. |
| */ |
| private static final char WINDOWS_SEPARATOR = '\\'; |
| |
| /** |
| * The system separator character. |
| */ |
| private static final char SYSTEM_SEPARATOR = File.separatorChar; |
| |
| /** |
| * The separator character that is the opposite of the system separator. |
| */ |
| private static final char OTHER_SEPARATOR; |
| static { |
| if (isSystemWindows()) { |
| OTHER_SEPARATOR = UNIX_SEPARATOR; |
| } else { |
| OTHER_SEPARATOR = WINDOWS_SEPARATOR; |
| } |
| } |
| |
| /** |
| * Instances should NOT be constructed in standard programming. |
| */ |
| public FilenameUtils() { |
| super(); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Determines if Windows file system is in use. |
| * |
| * @return true if the system is Windows |
| */ |
| static boolean isSystemWindows() { |
| return SYSTEM_SEPARATOR == WINDOWS_SEPARATOR; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Checks if the character is a separator. |
| * |
| * @param ch the character to check |
| * @return true if it is a separator character |
| */ |
| private static boolean isSeparator(char ch) { |
| return ch == UNIX_SEPARATOR || ch == WINDOWS_SEPARATOR; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Normalizes a path, removing double and single dot path steps. |
| * <p> |
| * This method normalizes a path to a standard format. |
| * The input may contain separators in either Unix or Windows format. |
| * The output will contain separators in the format of the system. |
| * <p> |
| * A trailing slash will be retained. |
| * A double slash will be merged to a single slash (but UNC names are handled). |
| * A single dot path segment will be removed. |
| * A double dot will cause that path segment and the one before to be removed. |
| * If the double dot has no parent path segment to work with, {@code null} |
| * is returned. |
| * <p> |
| * The output will be the same on both Unix and Windows except |
| * for the separator character. |
| * <pre> |
| * /foo// --> /foo/ |
| * /foo/./ --> /foo/ |
| * /foo/../bar --> /bar |
| * /foo/../bar/ --> /bar/ |
| * /foo/../bar/../baz --> /baz |
| * //foo//./bar --> /foo/bar |
| * /../ --> null |
| * ../foo --> null |
| * foo/bar/.. --> foo/ |
| * foo/../../bar --> null |
| * foo/../bar --> bar |
| * //server/foo/../bar --> //server/bar |
| * //server/../bar --> null |
| * C:\foo\..\bar --> C:\bar |
| * C:\..\bar --> null |
| * ~/foo/../bar/ --> ~/bar/ |
| * ~/../bar --> null |
| * </pre> |
| * (Note the file separator returned will be correct for Windows/Unix) |
| * |
| * @param filename the filename to normalize, null returns null |
| * @return the normalized filename, or null if invalid |
| */ |
| public static String normalize(String filename) { |
| return doNormalize(filename, SYSTEM_SEPARATOR, true); |
| } |
| /** |
| * Normalizes a path, removing double and single dot path steps. |
| * <p> |
| * This method normalizes a path to a standard format. |
| * The input may contain separators in either Unix or Windows format. |
| * The output will contain separators in the format specified. |
| * <p> |
| * A trailing slash will be retained. |
| * A double slash will be merged to a single slash (but UNC names are handled). |
| * A single dot path segment will be removed. |
| * A double dot will cause that path segment and the one before to be removed. |
| * If the double dot has no parent path segment to work with, {@code null} |
| * is returned. |
| * <p> |
| * The output will be the same on both Unix and Windows except |
| * for the separator character. |
| * <pre> |
| * /foo// --> /foo/ |
| * /foo/./ --> /foo/ |
| * /foo/../bar --> /bar |
| * /foo/../bar/ --> /bar/ |
| * /foo/../bar/../baz --> /baz |
| * //foo//./bar --> /foo/bar |
| * /../ --> null |
| * ../foo --> null |
| * foo/bar/.. --> foo/ |
| * foo/../../bar --> null |
| * foo/../bar --> bar |
| * //server/foo/../bar --> //server/bar |
| * //server/../bar --> null |
| * C:\foo\..\bar --> C:\bar |
| * C:\..\bar --> null |
| * ~/foo/../bar/ --> ~/bar/ |
| * ~/../bar --> null |
| * </pre> |
| * The output will be the same on both Unix and Windows including |
| * the separator character. |
| * |
| * @param filename the filename to normalize, null returns null |
| * @param unixSeparator {@code true} if a unix separator should |
| * be used or {@code false} if a windows separator should be used. |
| * @return the normalized filename, or null if invalid |
| * @since 2.0 |
| */ |
| public static String normalize(String filename, boolean unixSeparator) { |
| char separator = unixSeparator ? UNIX_SEPARATOR : WINDOWS_SEPARATOR; |
| return doNormalize(filename, separator, true); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Normalizes a path, removing double and single dot path steps, |
| * and removing any final directory separator. |
| * <p> |
| * This method normalizes a path to a standard format. |
| * The input may contain separators in either Unix or Windows format. |
| * The output will contain separators in the format of the system. |
| * <p> |
| * A trailing slash will be removed. |
| * A double slash will be merged to a single slash (but UNC names are handled). |
| * A single dot path segment will be removed. |
| * A double dot will cause that path segment and the one before to be removed. |
| * If the double dot has no parent path segment to work with, {@code null} |
| * is returned. |
| * <p> |
| * The output will be the same on both Unix and Windows except |
| * for the separator character. |
| * <pre> |
| * /foo// --> /foo |
| * /foo/./ --> /foo |
| * /foo/../bar --> /bar |
| * /foo/../bar/ --> /bar |
| * /foo/../bar/../baz --> /baz |
| * //foo//./bar --> /foo/bar |
| * /../ --> null |
| * ../foo --> null |
| * foo/bar/.. --> foo |
| * foo/../../bar --> null |
| * foo/../bar --> bar |
| * //server/foo/../bar --> //server/bar |
| * //server/../bar --> null |
| * C:\foo\..\bar --> C:\bar |
| * C:\..\bar --> null |
| * ~/foo/../bar/ --> ~/bar |
| * ~/../bar --> null |
| * </pre> |
| * (Note the file separator returned will be correct for Windows/Unix) |
| * |
| * @param filename the filename to normalize, null returns null |
| * @return the normalized filename, or null if invalid |
| */ |
| public static String normalizeNoEndSeparator(String filename) { |
| return doNormalize(filename, SYSTEM_SEPARATOR, false); |
| } |
| |
| /** |
| * Normalizes a path, removing double and single dot path steps, |
| * and removing any final directory separator. |
| * <p> |
| * This method normalizes a path to a standard format. |
| * The input may contain separators in either Unix or Windows format. |
| * The output will contain separators in the format specified. |
| * <p> |
| * A trailing slash will be removed. |
| * A double slash will be merged to a single slash (but UNC names are handled). |
| * A single dot path segment will be removed. |
| * A double dot will cause that path segment and the one before to be removed. |
| * If the double dot has no parent path segment to work with, {@code null} |
| * is returned. |
| * <p> |
| * The output will be the same on both Unix and Windows including |
| * the separator character. |
| * <pre> |
| * /foo// --> /foo |
| * /foo/./ --> /foo |
| * /foo/../bar --> /bar |
| * /foo/../bar/ --> /bar |
| * /foo/../bar/../baz --> /baz |
| * //foo//./bar --> /foo/bar |
| * /../ --> null |
| * ../foo --> null |
| * foo/bar/.. --> foo |
| * foo/../../bar --> null |
| * foo/../bar --> bar |
| * //server/foo/../bar --> //server/bar |
| * //server/../bar --> null |
| * C:\foo\..\bar --> C:\bar |
| * C:\..\bar --> null |
| * ~/foo/../bar/ --> ~/bar |
| * ~/../bar --> null |
| * </pre> |
| * |
| * @param filename the filename to normalize, null returns null |
| * @param unixSeparator {@code true} if a unix separator should |
| * be used or {@code false} if a windows separtor should be used. |
| * @return the normalized filename, or null if invalid |
| * @since 2.0 |
| */ |
| public static String normalizeNoEndSeparator(String filename, boolean unixSeparator) { |
| char separator = unixSeparator ? UNIX_SEPARATOR : WINDOWS_SEPARATOR; |
| return doNormalize(filename, separator, false); |
| } |
| |
| /** |
| * Internal method to perform the normalization. |
| * |
| * @param filename the filename |
| * @param separator The separator character to use |
| * @param keepSeparator true to keep the final separator |
| * @return the normalized filename |
| */ |
| private static String doNormalize(String filename, char separator, boolean keepSeparator) { |
| if (filename == null) { |
| return null; |
| } |
| int size = filename.length(); |
| if (size == 0) { |
| return filename; |
| } |
| int prefix = getPrefixLength(filename); |
| if (prefix < 0) { |
| return null; |
| } |
| |
| char[] array = new char[size + 2]; // +1 for possible extra slash, +2 for arraycopy |
| filename.getChars(0, filename.length(), array, 0); |
| |
| // fix separators throughout |
| char otherSeparator = separator == SYSTEM_SEPARATOR ? OTHER_SEPARATOR : SYSTEM_SEPARATOR; |
| for (int i = 0; i < array.length; i++) { |
| if (array[i] == otherSeparator) { |
| array[i] = separator; |
| } |
| } |
| |
| // add extra separator on the end to simplify code below |
| boolean lastIsDirectory = true; |
| if (array[size - 1] != separator) { |
| array[size++] = separator; |
| lastIsDirectory = false; |
| } |
| |
| // adjoining slashes |
| for (int i = prefix + 1; i < size; i++) { |
| if (array[i] == separator && array[i - 1] == separator) { |
| System.arraycopy(array, i, array, i - 1, size - i); |
| size--; |
| i--; |
| } |
| } |
| |
| // dot slash |
| for (int i = prefix + 1; i < size; i++) { |
| if (array[i] == separator && array[i - 1] == '.' && |
| (i == prefix + 1 || array[i - 2] == separator)) { |
| if (i == size - 1) { |
| lastIsDirectory = true; |
| } |
| System.arraycopy(array, i + 1, array, i - 1, size - i); |
| size -=2; |
| i--; |
| } |
| } |
| |
| // double dot slash |
| outer: |
| for (int i = prefix + 2; i < size; i++) { |
| if (array[i] == separator && array[i - 1] == '.' && array[i - 2] == '.' && |
| (i == prefix + 2 || array[i - 3] == separator)) { |
| if (i == prefix + 2) { |
| return null; |
| } |
| if (i == size - 1) { |
| lastIsDirectory = true; |
| } |
| int j; |
| for (j = i - 4 ; j >= prefix; j--) { |
| if (array[j] == separator) { |
| // remove b/../ from a/b/../c |
| System.arraycopy(array, i + 1, array, j + 1, size - i); |
| size -= i - j; |
| i = j + 1; |
| continue outer; |
| } |
| } |
| // remove a/../ from a/../c |
| System.arraycopy(array, i + 1, array, prefix, size - i); |
| size -= i + 1 - prefix; |
| i = prefix + 1; |
| } |
| } |
| |
| if (size <= 0) { // should never be less than 0 |
| return ""; |
| } |
| if (size <= prefix) { // should never be less than prefix |
| return new String(array, 0, size); |
| } |
| if (lastIsDirectory && keepSeparator) { |
| return new String(array, 0, size); // keep trailing separator |
| } |
| return new String(array, 0, size - 1); // lose trailing separator |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Concatenates a filename to a base path using normal command line style rules. |
| * <p> |
| * The effect is equivalent to resultant directory after changing |
| * directory to the first argument, followed by changing directory to |
| * the second argument. |
| * <p> |
| * The first argument is the base path, the second is the path to concatenate. |
| * The returned path is always normalized via {@link #normalize(String)}, |
| * thus <code>..</code> is handled. |
| * <p> |
| * If <code>pathToAdd</code> is absolute (has an absolute prefix), then |
| * it will be normalized and returned. |
| * Otherwise, the paths will be joined, normalized and returned. |
| * <p> |
| * The output will be the same on both Unix and Windows except |
| * for the separator character. |
| * <pre> |
| * /foo/ + bar --> /foo/bar |
| * /foo + bar --> /foo/bar |
| * /foo + /bar --> /bar |
| * /foo + C:/bar --> C:/bar |
| * /foo + C:bar --> C:bar (*) |
| * /foo/a/ + ../bar --> foo/bar |
| * /foo/ + ../../bar --> null |
| * /foo/ + /bar --> /bar |
| * /foo/.. + /bar --> /bar |
| * /foo + bar/c.txt --> /foo/bar/c.txt |
| * /foo/c.txt + bar --> /foo/c.txt/bar (!) |
| * </pre> |
| * (*) Note that the Windows relative drive prefix is unreliable when |
| * used with this method. |
| * (!) Note that the first parameter must be a path. If it ends with a name, then |
| * the name will be built into the concatenated path. If this might be a problem, |
| * use {@link #getFullPath(String)} on the base path argument. |
| * |
| * @param basePath the base path to attach to, always treated as a path |
| * @param fullFilenameToAdd the filename (or path) to attach to the base |
| * @return the concatenated path, or null if invalid |
| */ |
| public static String concat(String basePath, String fullFilenameToAdd) { |
| int prefix = getPrefixLength(fullFilenameToAdd); |
| if (prefix < 0) { |
| return null; |
| } |
| if (prefix > 0) { |
| return normalize(fullFilenameToAdd); |
| } |
| if (basePath == null) { |
| return null; |
| } |
| int len = basePath.length(); |
| if (len == 0) { |
| return normalize(fullFilenameToAdd); |
| } |
| char ch = basePath.charAt(len - 1); |
| if (isSeparator(ch)) { |
| return normalize(basePath + fullFilenameToAdd); |
| } else { |
| return normalize(basePath + '/' + fullFilenameToAdd); |
| } |
| } |
| |
| /** |
| * Determines whether the {@code parent} directory contains the {@code child} element (a file or directory). |
| * <p> |
| * The files names are expected to be normalized. |
| * </p> |
| * |
| * Edge cases: |
| * <ul> |
| * <li>A {@code directory} must not be null: if null, throw IllegalArgumentException</li> |
| * <li>A directory does not contain itself: return false</li> |
| * <li>A null child file is not contained in any parent: return false</li> |
| * </ul> |
| * |
| * @param canonicalParent |
| * the file to consider as the parent. |
| * @param canonicalChild |
| * the file to consider as the child. |
| * @return true is the candidate leaf is under by the specified composite. False otherwise. |
| * @throws IOException |
| * if an IO error occurs while checking the files. |
| * @since 2.2 |
| * @see FileUtils#directoryContains(File, File) |
| */ |
| public static boolean directoryContains(final String canonicalParent, final String canonicalChild) |
| throws IOException { |
| |
| // Fail fast against NullPointerException |
| if (canonicalParent == null) { |
| throw new IllegalArgumentException("Directory must not be null"); |
| } |
| |
| if (canonicalChild == null) { |
| return false; |
| } |
| |
| if (IOCase.SYSTEM.checkEquals(canonicalParent, canonicalChild)) { |
| return false; |
| } |
| |
| return IOCase.SYSTEM.checkStartsWith(canonicalChild, canonicalParent); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Converts all separators to the Unix separator of forward slash. |
| * |
| * @param path the path to be changed, null ignored |
| * @return the updated path |
| */ |
| public static String separatorsToUnix(String path) { |
| if (path == null || path.indexOf(WINDOWS_SEPARATOR) == -1) { |
| return path; |
| } |
| return path.replace(WINDOWS_SEPARATOR, UNIX_SEPARATOR); |
| } |
| |
| /** |
| * Converts all separators to the Windows separator of backslash. |
| * |
| * @param path the path to be changed, null ignored |
| * @return the updated path |
| */ |
| public static String separatorsToWindows(String path) { |
| if (path == null || path.indexOf(UNIX_SEPARATOR) == -1) { |
| return path; |
| } |
| return path.replace(UNIX_SEPARATOR, WINDOWS_SEPARATOR); |
| } |
| |
| /** |
| * Converts all separators to the system separator. |
| * |
| * @param path the path to be changed, null ignored |
| * @return the updated path |
| */ |
| public static String separatorsToSystem(String path) { |
| if (path == null) { |
| return null; |
| } |
| if (isSystemWindows()) { |
| return separatorsToWindows(path); |
| } else { |
| return separatorsToUnix(path); |
| } |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Returns the length of the filename prefix, such as <code>C:/</code> or <code>~/</code>. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * <p> |
| * The prefix length includes the first slash in the full filename |
| * if applicable. Thus, it is possible that the length returned is greater |
| * than the length of the input string. |
| * <pre> |
| * Windows: |
| * a\b\c.txt --> "" --> relative |
| * \a\b\c.txt --> "\" --> current drive absolute |
| * C:a\b\c.txt --> "C:" --> drive relative |
| * C:\a\b\c.txt --> "C:\" --> absolute |
| * \\server\a\b\c.txt --> "\\server\" --> UNC |
| * |
| * Unix: |
| * a/b/c.txt --> "" --> relative |
| * /a/b/c.txt --> "/" --> absolute |
| * ~/a/b/c.txt --> "~/" --> current user |
| * ~ --> "~/" --> current user (slash added) |
| * ~user/a/b/c.txt --> "~user/" --> named user |
| * ~user --> "~user/" --> named user (slash added) |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * ie. both Unix and Windows prefixes are matched regardless. |
| * |
| * @param filename the filename to find the prefix in, null returns -1 |
| * @return the length of the prefix, -1 if invalid or null |
| */ |
| public static int getPrefixLength(String filename) { |
| if (filename == null) { |
| return -1; |
| } |
| int len = filename.length(); |
| if (len == 0) { |
| return 0; |
| } |
| char ch0 = filename.charAt(0); |
| if (ch0 == ':') { |
| return -1; |
| } |
| if (len == 1) { |
| if (ch0 == '~') { |
| return 2; // return a length greater than the input |
| } |
| return isSeparator(ch0) ? 1 : 0; |
| } else { |
| if (ch0 == '~') { |
| int posUnix = filename.indexOf(UNIX_SEPARATOR, 1); |
| int posWin = filename.indexOf(WINDOWS_SEPARATOR, 1); |
| if (posUnix == -1 && posWin == -1) { |
| return len + 1; // return a length greater than the input |
| } |
| posUnix = posUnix == -1 ? posWin : posUnix; |
| posWin = posWin == -1 ? posUnix : posWin; |
| return Math.min(posUnix, posWin) + 1; |
| } |
| char ch1 = filename.charAt(1); |
| if (ch1 == ':') { |
| ch0 = Character.toUpperCase(ch0); |
| if (ch0 >= 'A' && ch0 <= 'Z') { |
| if (len == 2 || isSeparator(filename.charAt(2)) == false) { |
| return 2; |
| } |
| return 3; |
| } |
| return -1; |
| |
| } else if (isSeparator(ch0) && isSeparator(ch1)) { |
| int posUnix = filename.indexOf(UNIX_SEPARATOR, 2); |
| int posWin = filename.indexOf(WINDOWS_SEPARATOR, 2); |
| if (posUnix == -1 && posWin == -1 || posUnix == 2 || posWin == 2) { |
| return -1; |
| } |
| posUnix = posUnix == -1 ? posWin : posUnix; |
| posWin = posWin == -1 ? posUnix : posWin; |
| return Math.min(posUnix, posWin) + 1; |
| } else { |
| return isSeparator(ch0) ? 1 : 0; |
| } |
| } |
| } |
| |
| /** |
| * Returns the index of the last directory separator character. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * The position of the last forward or backslash is returned. |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * |
| * @param filename the filename to find the last path separator in, null returns -1 |
| * @return the index of the last separator character, or -1 if there |
| * is no such character |
| */ |
| public static int indexOfLastSeparator(String filename) { |
| if (filename == null) { |
| return -1; |
| } |
| int lastUnixPos = filename.lastIndexOf(UNIX_SEPARATOR); |
| int lastWindowsPos = filename.lastIndexOf(WINDOWS_SEPARATOR); |
| return Math.max(lastUnixPos, lastWindowsPos); |
| } |
| |
| /** |
| * Returns the index of the last extension separator character, which is a dot. |
| * <p> |
| * This method also checks that there is no directory separator after the last dot. |
| * To do this it uses {@link #indexOfLastSeparator(String)} which will |
| * handle a file in either Unix or Windows format. |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * |
| * @param filename the filename to find the last path separator in, null returns -1 |
| * @return the index of the last separator character, or -1 if there |
| * is no such character |
| */ |
| public static int indexOfExtension(String filename) { |
| if (filename == null) { |
| return -1; |
| } |
| int extensionPos = filename.lastIndexOf(EXTENSION_SEPARATOR); |
| int lastSeparator = indexOfLastSeparator(filename); |
| return lastSeparator > extensionPos ? -1 : extensionPos; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Gets the prefix from a full filename, such as <code>C:/</code> |
| * or <code>~/</code>. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * The prefix includes the first slash in the full filename where applicable. |
| * <pre> |
| * Windows: |
| * a\b\c.txt --> "" --> relative |
| * \a\b\c.txt --> "\" --> current drive absolute |
| * C:a\b\c.txt --> "C:" --> drive relative |
| * C:\a\b\c.txt --> "C:\" --> absolute |
| * \\server\a\b\c.txt --> "\\server\" --> UNC |
| * |
| * Unix: |
| * a/b/c.txt --> "" --> relative |
| * /a/b/c.txt --> "/" --> absolute |
| * ~/a/b/c.txt --> "~/" --> current user |
| * ~ --> "~/" --> current user (slash added) |
| * ~user/a/b/c.txt --> "~user/" --> named user |
| * ~user --> "~user/" --> named user (slash added) |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * ie. both Unix and Windows prefixes are matched regardless. |
| * |
| * @param filename the filename to query, null returns null |
| * @return the prefix of the file, null if invalid |
| */ |
| public static String getPrefix(String filename) { |
| if (filename == null) { |
| return null; |
| } |
| int len = getPrefixLength(filename); |
| if (len < 0) { |
| return null; |
| } |
| if (len > filename.length()) { |
| return filename + UNIX_SEPARATOR; // we know this only happens for unix |
| } |
| return filename.substring(0, len); |
| } |
| |
| /** |
| * Gets the path from a full filename, which excludes the prefix. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * The method is entirely text based, and returns the text before and |
| * including the last forward or backslash. |
| * <pre> |
| * C:\a\b\c.txt --> a\b\ |
| * ~/a/b/c.txt --> a/b/ |
| * a.txt --> "" |
| * a/b/c --> a/b/ |
| * a/b/c/ --> a/b/c/ |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * <p> |
| * This method drops the prefix from the result. |
| * See {@link #getFullPath(String)} for the method that retains the prefix. |
| * |
| * @param filename the filename to query, null returns null |
| * @return the path of the file, an empty string if none exists, null if invalid |
| */ |
| public static String getPath(String filename) { |
| return doGetPath(filename, 1); |
| } |
| |
| /** |
| * Gets the path from a full filename, which excludes the prefix, and |
| * also excluding the final directory separator. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * The method is entirely text based, and returns the text before the |
| * last forward or backslash. |
| * <pre> |
| * C:\a\b\c.txt --> a\b |
| * ~/a/b/c.txt --> a/b |
| * a.txt --> "" |
| * a/b/c --> a/b |
| * a/b/c/ --> a/b/c |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * <p> |
| * This method drops the prefix from the result. |
| * See {@link #getFullPathNoEndSeparator(String)} for the method that retains the prefix. |
| * |
| * @param filename the filename to query, null returns null |
| * @return the path of the file, an empty string if none exists, null if invalid |
| */ |
| public static String getPathNoEndSeparator(String filename) { |
| return doGetPath(filename, 0); |
| } |
| |
| /** |
| * Does the work of getting the path. |
| * |
| * @param filename the filename |
| * @param separatorAdd 0 to omit the end separator, 1 to return it |
| * @return the path |
| */ |
| private static String doGetPath(String filename, int separatorAdd) { |
| if (filename == null) { |
| return null; |
| } |
| int prefix = getPrefixLength(filename); |
| if (prefix < 0) { |
| return null; |
| } |
| int index = indexOfLastSeparator(filename); |
| int endIndex = index+separatorAdd; |
| if (prefix >= filename.length() || index < 0 || prefix >= endIndex) { |
| return ""; |
| } |
| return filename.substring(prefix, endIndex); |
| } |
| |
| /** |
| * Gets the full path from a full filename, which is the prefix + path. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * The method is entirely text based, and returns the text before and |
| * including the last forward or backslash. |
| * <pre> |
| * C:\a\b\c.txt --> C:\a\b\ |
| * ~/a/b/c.txt --> ~/a/b/ |
| * a.txt --> "" |
| * a/b/c --> a/b/ |
| * a/b/c/ --> a/b/c/ |
| * C: --> C: |
| * C:\ --> C:\ |
| * ~ --> ~/ |
| * ~/ --> ~/ |
| * ~user --> ~user/ |
| * ~user/ --> ~user/ |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * |
| * @param filename the filename to query, null returns null |
| * @return the path of the file, an empty string if none exists, null if invalid |
| */ |
| public static String getFullPath(String filename) { |
| return doGetFullPath(filename, true); |
| } |
| |
| /** |
| * Gets the full path from a full filename, which is the prefix + path, |
| * and also excluding the final directory separator. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * The method is entirely text based, and returns the text before the |
| * last forward or backslash. |
| * <pre> |
| * C:\a\b\c.txt --> C:\a\b |
| * ~/a/b/c.txt --> ~/a/b |
| * a.txt --> "" |
| * a/b/c --> a/b |
| * a/b/c/ --> a/b/c |
| * C: --> C: |
| * C:\ --> C:\ |
| * ~ --> ~ |
| * ~/ --> ~ |
| * ~user --> ~user |
| * ~user/ --> ~user |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * |
| * @param filename the filename to query, null returns null |
| * @return the path of the file, an empty string if none exists, null if invalid |
| */ |
| public static String getFullPathNoEndSeparator(String filename) { |
| return doGetFullPath(filename, false); |
| } |
| |
| /** |
| * Does the work of getting the path. |
| * |
| * @param filename the filename |
| * @param includeSeparator true to include the end separator |
| * @return the path |
| */ |
| private static String doGetFullPath(String filename, boolean includeSeparator) { |
| if (filename == null) { |
| return null; |
| } |
| int prefix = getPrefixLength(filename); |
| if (prefix < 0) { |
| return null; |
| } |
| if (prefix >= filename.length()) { |
| if (includeSeparator) { |
| return getPrefix(filename); // add end slash if necessary |
| } else { |
| return filename; |
| } |
| } |
| int index = indexOfLastSeparator(filename); |
| if (index < 0) { |
| return filename.substring(0, prefix); |
| } |
| int end = index + (includeSeparator ? 1 : 0); |
| if (end == 0) { |
| end++; |
| } |
| return filename.substring(0, end); |
| } |
| |
| /** |
| * Gets the name minus the path from a full filename. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * The text after the last forward or backslash is returned. |
| * <pre> |
| * a/b/c.txt --> c.txt |
| * a.txt --> a.txt |
| * a/b/c --> c |
| * a/b/c/ --> "" |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * |
| * @param filename the filename to query, null returns null |
| * @return the name of the file without the path, or an empty string if none exists |
| */ |
| public static String getName(String filename) { |
| if (filename == null) { |
| return null; |
| } |
| int index = indexOfLastSeparator(filename); |
| return filename.substring(index + 1); |
| } |
| |
| /** |
| * Gets the base name, minus the full path and extension, from a full filename. |
| * <p> |
| * This method will handle a file in either Unix or Windows format. |
| * The text after the last forward or backslash and before the last dot is returned. |
| * <pre> |
| * a/b/c.txt --> c |
| * a.txt --> a |
| * a/b/c --> c |
| * a/b/c/ --> "" |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * |
| * @param filename the filename to query, null returns null |
| * @return the name of the file without the path, or an empty string if none exists |
| */ |
| public static String getBaseName(String filename) { |
| return removeExtension(getName(filename)); |
| } |
| |
| /** |
| * Gets the extension of a filename. |
| * <p> |
| * This method returns the textual part of the filename after the last dot. |
| * There must be no directory separator after the dot. |
| * <pre> |
| * foo.txt --> "txt" |
| * a/b/c.jpg --> "jpg" |
| * a/b.txt/c --> "" |
| * a/b/c --> "" |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * |
| * @param filename the filename to retrieve the extension of. |
| * @return the extension of the file or an empty string if none exists or {@code null} |
| * if the filename is {@code null}. |
| */ |
| public static String getExtension(String filename) { |
| if (filename == null) { |
| return null; |
| } |
| int index = indexOfExtension(filename); |
| if (index == -1) { |
| return ""; |
| } else { |
| return filename.substring(index + 1); |
| } |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Removes the extension from a filename. |
| * <p> |
| * This method returns the textual part of the filename before the last dot. |
| * There must be no directory separator after the dot. |
| * <pre> |
| * foo.txt --> foo |
| * a\b\c.jpg --> a\b\c |
| * a\b\c --> a\b\c |
| * a.b\c --> a.b\c |
| * </pre> |
| * <p> |
| * The output will be the same irrespective of the machine that the code is running on. |
| * |
| * @param filename the filename to query, null returns null |
| * @return the filename minus the extension |
| */ |
| public static String removeExtension(String filename) { |
| if (filename == null) { |
| return null; |
| } |
| int index = indexOfExtension(filename); |
| if (index == -1) { |
| return filename; |
| } else { |
| return filename.substring(0, index); |
| } |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Checks whether two filenames are equal exactly. |
| * <p> |
| * No processing is performed on the filenames other than comparison, |
| * thus this is merely a null-safe case-sensitive equals. |
| * |
| * @param filename1 the first filename to query, may be null |
| * @param filename2 the second filename to query, may be null |
| * @return true if the filenames are equal, null equals null |
| * @see IOCase#SENSITIVE |
| */ |
| public static boolean equals(String filename1, String filename2) { |
| return equals(filename1, filename2, false, IOCase.SENSITIVE); |
| } |
| |
| /** |
| * Checks whether two filenames are equal using the case rules of the system. |
| * <p> |
| * No processing is performed on the filenames other than comparison. |
| * The check is case-sensitive on Unix and case-insensitive on Windows. |
| * |
| * @param filename1 the first filename to query, may be null |
| * @param filename2 the second filename to query, may be null |
| * @return true if the filenames are equal, null equals null |
| * @see IOCase#SYSTEM |
| */ |
| public static boolean equalsOnSystem(String filename1, String filename2) { |
| return equals(filename1, filename2, false, IOCase.SYSTEM); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Checks whether two filenames are equal after both have been normalized. |
| * <p> |
| * Both filenames are first passed to {@link #normalize(String)}. |
| * The check is then performed in a case-sensitive manner. |
| * |
| * @param filename1 the first filename to query, may be null |
| * @param filename2 the second filename to query, may be null |
| * @return true if the filenames are equal, null equals null |
| * @see IOCase#SENSITIVE |
| */ |
| public static boolean equalsNormalized(String filename1, String filename2) { |
| return equals(filename1, filename2, true, IOCase.SENSITIVE); |
| } |
| |
| /** |
| * Checks whether two filenames are equal after both have been normalized |
| * and using the case rules of the system. |
| * <p> |
| * Both filenames are first passed to {@link #normalize(String)}. |
| * The check is then performed case-sensitive on Unix and |
| * case-insensitive on Windows. |
| * |
| * @param filename1 the first filename to query, may be null |
| * @param filename2 the second filename to query, may be null |
| * @return true if the filenames are equal, null equals null |
| * @see IOCase#SYSTEM |
| */ |
| public static boolean equalsNormalizedOnSystem(String filename1, String filename2) { |
| return equals(filename1, filename2, true, IOCase.SYSTEM); |
| } |
| |
| /** |
| * Checks whether two filenames are equal, optionally normalizing and providing |
| * control over the case-sensitivity. |
| * |
| * @param filename1 the first filename to query, may be null |
| * @param filename2 the second filename to query, may be null |
| * @param normalized whether to normalize the filenames |
| * @param caseSensitivity what case sensitivity rule to use, null means case-sensitive |
| * @return true if the filenames are equal, null equals null |
| * @since 1.3 |
| */ |
| public static boolean equals( |
| String filename1, String filename2, |
| boolean normalized, IOCase caseSensitivity) { |
| |
| if (filename1 == null || filename2 == null) { |
| return filename1 == null && filename2 == null; |
| } |
| if (normalized) { |
| filename1 = normalize(filename1); |
| filename2 = normalize(filename2); |
| if (filename1 == null || filename2 == null) { |
| throw new NullPointerException( |
| "Error normalizing one or both of the file names"); |
| } |
| } |
| if (caseSensitivity == null) { |
| caseSensitivity = IOCase.SENSITIVE; |
| } |
| return caseSensitivity.checkEquals(filename1, filename2); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Checks whether the extension of the filename is that specified. |
| * <p> |
| * This method obtains the extension as the textual part of the filename |
| * after the last dot. There must be no directory separator after the dot. |
| * The extension check is case-sensitive on all platforms. |
| * |
| * @param filename the filename to query, null returns false |
| * @param extension the extension to check for, null or empty checks for no extension |
| * @return true if the filename has the specified extension |
| */ |
| public static boolean isExtension(String filename, String extension) { |
| if (filename == null) { |
| return false; |
| } |
| if (extension == null || extension.length() == 0) { |
| return indexOfExtension(filename) == -1; |
| } |
| String fileExt = getExtension(filename); |
| return fileExt.equals(extension); |
| } |
| |
| /** |
| * Checks whether the extension of the filename is one of those specified. |
| * <p> |
| * This method obtains the extension as the textual part of the filename |
| * after the last dot. There must be no directory separator after the dot. |
| * The extension check is case-sensitive on all platforms. |
| * |
| * @param filename the filename to query, null returns false |
| * @param extensions the extensions to check for, null checks for no extension |
| * @return true if the filename is one of the extensions |
| */ |
| public static boolean isExtension(String filename, String[] extensions) { |
| if (filename == null) { |
| return false; |
| } |
| if (extensions == null || extensions.length == 0) { |
| return indexOfExtension(filename) == -1; |
| } |
| String fileExt = getExtension(filename); |
| for (String extension : extensions) { |
| if (fileExt.equals(extension)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Checks whether the extension of the filename is one of those specified. |
| * <p> |
| * This method obtains the extension as the textual part of the filename |
| * after the last dot. There must be no directory separator after the dot. |
| * The extension check is case-sensitive on all platforms. |
| * |
| * @param filename the filename to query, null returns false |
| * @param extensions the extensions to check for, null checks for no extension |
| * @return true if the filename is one of the extensions |
| */ |
| public static boolean isExtension(String filename, Collection<String> extensions) { |
| if (filename == null) { |
| return false; |
| } |
| if (extensions == null || extensions.isEmpty()) { |
| return indexOfExtension(filename) == -1; |
| } |
| String fileExt = getExtension(filename); |
| for (String extension : extensions) { |
| if (fileExt.equals(extension)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Checks a filename to see if it matches the specified wildcard matcher, |
| * always testing case-sensitive. |
| * <p> |
| * The wildcard matcher uses the characters '?' and '*' to represent a |
| * single or multiple (zero or more) wildcard characters. |
| * This is the same as often found on Dos/Unix command lines. |
| * The check is case-sensitive always. |
| * <pre> |
| * wildcardMatch("c.txt", "*.txt") --> true |
| * wildcardMatch("c.txt", "*.jpg") --> false |
| * wildcardMatch("a/b/c.txt", "a/b/*") --> true |
| * wildcardMatch("c.txt", "*.???") --> true |
| * wildcardMatch("c.txt", "*.????") --> false |
| * </pre> |
| * N.B. the sequence "*?" does not work properly at present in match strings. |
| * |
| * @param filename the filename to match on |
| * @param wildcardMatcher the wildcard string to match against |
| * @return true if the filename matches the wilcard string |
| * @see IOCase#SENSITIVE |
| */ |
| public static boolean wildcardMatch(String filename, String wildcardMatcher) { |
| return wildcardMatch(filename, wildcardMatcher, IOCase.SENSITIVE); |
| } |
| |
| /** |
| * Checks a filename to see if it matches the specified wildcard matcher |
| * using the case rules of the system. |
| * <p> |
| * The wildcard matcher uses the characters '?' and '*' to represent a |
| * single or multiple (zero or more) wildcard characters. |
| * This is the same as often found on Dos/Unix command lines. |
| * The check is case-sensitive on Unix and case-insensitive on Windows. |
| * <pre> |
| * wildcardMatch("c.txt", "*.txt") --> true |
| * wildcardMatch("c.txt", "*.jpg") --> false |
| * wildcardMatch("a/b/c.txt", "a/b/*") --> true |
| * wildcardMatch("c.txt", "*.???") --> true |
| * wildcardMatch("c.txt", "*.????") --> false |
| * </pre> |
| * N.B. the sequence "*?" does not work properly at present in match strings. |
| * |
| * @param filename the filename to match on |
| * @param wildcardMatcher the wildcard string to match against |
| * @return true if the filename matches the wilcard string |
| * @see IOCase#SYSTEM |
| */ |
| public static boolean wildcardMatchOnSystem(String filename, String wildcardMatcher) { |
| return wildcardMatch(filename, wildcardMatcher, IOCase.SYSTEM); |
| } |
| |
| /** |
| * Checks a filename to see if it matches the specified wildcard matcher |
| * allowing control over case-sensitivity. |
| * <p> |
| * The wildcard matcher uses the characters '?' and '*' to represent a |
| * single or multiple (zero or more) wildcard characters. |
| * N.B. the sequence "*?" does not work properly at present in match strings. |
| * |
| * @param filename the filename to match on |
| * @param wildcardMatcher the wildcard string to match against |
| * @param caseSensitivity what case sensitivity rule to use, null means case-sensitive |
| * @return true if the filename matches the wilcard string |
| * @since 1.3 |
| */ |
| public static boolean wildcardMatch(String filename, String wildcardMatcher, IOCase caseSensitivity) { |
| if (filename == null && wildcardMatcher == null) { |
| return true; |
| } |
| if (filename == null || wildcardMatcher == null) { |
| return false; |
| } |
| if (caseSensitivity == null) { |
| caseSensitivity = IOCase.SENSITIVE; |
| } |
| String[] wcs = splitOnTokens(wildcardMatcher); |
| boolean anyChars = false; |
| int textIdx = 0; |
| int wcsIdx = 0; |
| Stack<int[]> backtrack = new Stack<int[]>(); |
| |
| // loop around a backtrack stack, to handle complex * matching |
| do { |
| if (backtrack.size() > 0) { |
| int[] array = backtrack.pop(); |
| wcsIdx = array[0]; |
| textIdx = array[1]; |
| anyChars = true; |
| } |
| |
| // loop whilst tokens and text left to process |
| while (wcsIdx < wcs.length) { |
| |
| if (wcs[wcsIdx].equals("?")) { |
| // ? so move to next text char |
| textIdx++; |
| if (textIdx > filename.length()) { |
| break; |
| } |
| anyChars = false; |
| |
| } else if (wcs[wcsIdx].equals("*")) { |
| // set any chars status |
| anyChars = true; |
| if (wcsIdx == wcs.length - 1) { |
| textIdx = filename.length(); |
| } |
| |
| } else { |
| // matching text token |
| if (anyChars) { |
| // any chars then try to locate text token |
| textIdx = caseSensitivity.checkIndexOf(filename, textIdx, wcs[wcsIdx]); |
| if (textIdx == -1) { |
| // token not found |
| break; |
| } |
| int repeat = caseSensitivity.checkIndexOf(filename, textIdx + 1, wcs[wcsIdx]); |
| if (repeat >= 0) { |
| backtrack.push(new int[] {wcsIdx, repeat}); |
| } |
| } else { |
| // matching from current position |
| if (!caseSensitivity.checkRegionMatches(filename, textIdx, wcs[wcsIdx])) { |
| // couldnt match token |
| break; |
| } |
| } |
| |
| // matched text token, move text index to end of matched token |
| textIdx += wcs[wcsIdx].length(); |
| anyChars = false; |
| } |
| |
| wcsIdx++; |
| } |
| |
| // full match |
| if (wcsIdx == wcs.length && textIdx == filename.length()) { |
| return true; |
| } |
| |
| } while (backtrack.size() > 0); |
| |
| return false; |
| } |
| |
| /** |
| * Splits a string into a number of tokens. |
| * The text is split by '?' and '*'. |
| * Where multiple '*' occur consecutively they are collapsed into a single '*'. |
| * |
| * @param text the text to split |
| * @return the array of tokens, never null |
| */ |
| static String[] splitOnTokens(String text) { |
| // used by wildcardMatch |
| // package level so a unit test may run on this |
| |
| if (text.indexOf('?') == -1 && text.indexOf('*') == -1) { |
| return new String[] { text }; |
| } |
| |
| char[] array = text.toCharArray(); |
| ArrayList<String> list = new ArrayList<String>(); |
| StringBuilder buffer = new StringBuilder(); |
| for (int i = 0; i < array.length; i++) { |
| if (array[i] == '?' || array[i] == '*') { |
| if (buffer.length() != 0) { |
| list.add(buffer.toString()); |
| buffer.setLength(0); |
| } |
| if (array[i] == '?') { |
| list.add("?"); |
| } else if (list.isEmpty() || |
| i > 0 && list.get(list.size() - 1).equals("*") == false) { |
| list.add("*"); |
| } |
| } else { |
| buffer.append(array[i]); |
| } |
| } |
| if (buffer.length() != 0) { |
| list.add(buffer.toString()); |
| } |
| |
| return list.toArray( new String[ list.size() ] ); |
| } |
| |
| } |
