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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/io/PlatformHelper.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/io/PlatformHelper.java')
-rw-r--r-- | libjava/classpath/gnu/java/io/PlatformHelper.java | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/io/PlatformHelper.java b/libjava/classpath/gnu/java/io/PlatformHelper.java new file mode 100644 index 000000000..545241110 --- /dev/null +++ b/libjava/classpath/gnu/java/io/PlatformHelper.java @@ -0,0 +1,129 @@ +/* PlatformHelper.java -- Isolate OS-specific IO helper methods and variables + Copyright (C) 1998, 2002, 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.io; + +/** + * We had many changes in File.java, URLStreamHandler.java etc. to handle + * path representations on different platforms (Windows/Unix-family). + * Finally we'd like to collect all these ad hoc codes into this utility class. + * --Gansha + */ +public class PlatformHelper +{ + public static final boolean isWindows = System.getProperty("os.name").indexOf("Windows") >= 0; + public static final String separator = System.getProperty("file.separator"); + public static final char separatorChar = separator.charAt(0); + public static final String pathSeparator = System.getProperty("path.separator"); + public static final char pathSeparatorChar = pathSeparator.charAt(0); + + /** + * On most platforms 260 is equal or greater than a max path value, + * so we can set the initial buffer size of StringBuffer to half of this value + * to improve performance. + */ + public static final int INITIAL_MAX_PATH = 260/2; + + /** + * This routine checks the input param "path" whether it begins with root path + * prefix. + * if not, return 0; + * if yes, return the len of root path prefix; + * --for Unix-family platform, root path begins with "/" and len is 1 + * --for Windows platform, root path begins with "drive:\\" and len is 3 + */ + public static final int beginWithRootPathPrefix(String path) + { + if (path.startsWith("/") || path.startsWith("\\")) + return 1; + + if (!isWindows) + return 0; + + if (path.length() > 2 + && Character.isLetter(path.charAt(0)) + && path.charAt(1) == ':' + && (path.charAt(2) == '/' || path.charAt(2) == '\\')) + return 3; + + return 0; + } + + /** + * This routine checks the input param "path" whether it's root directory. + * --for Unix-family platform, root directory is "/" + * --for Windows platform, root directory is "\\" or "drive:\\". + */ + public static final boolean isRootDirectory(String path) + { + int len = path.length(); + return len > 0 && beginWithRootPathPrefix(path) == len; + } + + /** + * This routine checks whether input param "path" ends with separator + */ + public static final boolean endWithSeparator(String path) + { + if (path.endsWith("\\") || path.endsWith("/")) + return true; + + return false; + } + + /** + * This routine removes from input param "path" the tail separator if it exists, + * and return the remain part. + */ + public static final String removeTailSeparator(String path) + { + if (endWithSeparator(path) && !isRootDirectory(path)) + return path.substring(0, path.length() - 1); + + return path; + } + + /** + * This routine returns last index of separator in input param "path", + * and return it. + */ + public static final int lastIndexOfSeparator(String path) + { + return Math.max(path.lastIndexOf("/"), path.lastIndexOf("\\")); + } + +} |