8f523f3a10
* sources.am: Regenerated.
* Makefile.in: Likewise.
* scripts/makemake.tcl: Use glob -nocomplain.
From-SVN: r107049
223 lines
7.5 KiB
Java
223 lines
7.5 KiB
Java
/* PlatformHelper.java -- Isolate OS-specific IO helper methods and variables
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Copyright (C) 1998, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.io;
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import java.util.StringTokenizer;
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/**
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* We had many changes in File.java, URLStreamHandler.java etc. to handle
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* path representations on different platforms (Windows/Unix-family).
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* Finally we'd like to collect all these ad hoc codes into this utility class.
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* --Gansha
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*/
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public class PlatformHelper
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{
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public static final boolean isWindows = System.getProperty("os.name").indexOf("Windows") >= 0;
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public static final String separator = System.getProperty("file.separator");
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public static final char separatorChar = separator.charAt(0);
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public static final String pathSeparator = System.getProperty("path.separator");
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public static final char pathSeparatorChar = pathSeparator.charAt(0);
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/**
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* On most platforms 260 is equal or greater than a max path value,
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* so we can set the initial buffer size of StringBuffer to half of this value
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* to improve performance.
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*/
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public static final int INITIAL_MAX_PATH = 260/2;
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/**
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* This routine checks the input param "path" whether it begins with root path
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* prefix.
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* if not, return 0;
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* if yes, return the len of root path prefix;
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* --for Unix-family platform, root path begins with "/" and len is 1
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* --for Windows platform, root path begins with "drive:\\" and len is 3
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*/
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public static final int beginWithRootPathPrefix(String path)
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{
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if (path.startsWith("/") || path.startsWith("\\"))
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return 1;
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if (!isWindows)
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return 0;
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if (path.length() > 2
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&& Character.isLetter(path.charAt(0))
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&& path.charAt(1) == ':'
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&& (path.charAt(2) == '/' || path.charAt(2) == '\\'))
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return 3;
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return 0;
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}
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/**
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* This routine checks the input param "path" whether it's root directory.
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* --for Unix-family platform, root directory is "/"
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* --for Windows platform, root directory is "\\" or "drive:\\".
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*/
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public static final boolean isRootDirectory(String path)
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{
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int len = path.length();
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return len > 0 && beginWithRootPathPrefix(path) == len;
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}
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/**
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* This routine canonicalizes input param "path" to formal path representation
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* for current platform, including interpreting ".." and "." .
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*/
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public static final String toCanonicalForm(String path)
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{
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/*??
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if(path.indexOf('.') < 0 && path.indexOf("..") < 0)
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return path;
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*/
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String tmppath = path.replace('/', separatorChar);
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StringBuffer canonpath;
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int i;
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if ((i = beginWithRootPathPrefix(tmppath)) == 0 )
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return path;
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/* The original
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"canonpath = new StringBuffer(tmppath.substring(0, i))"
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isn't very efficient because StringBuffer's
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ensureCapacity_unsynchronized will fail definitely each time
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and will enlarge buffer and copy contents. .
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*/
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canonpath = new StringBuffer(INITIAL_MAX_PATH);
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canonpath.append(tmppath.substring(0, i));
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tmppath = tmppath.substring(i);
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// pathdepth==0 indicates there're only root path in the buffer
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int pathdepth = 0;
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StringTokenizer st = new StringTokenizer(tmppath, separator);
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// Traverse each element of the path, handling "." and ".."
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// Should handle "~" too?
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if (st.hasMoreTokens())
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do
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{
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String s = st.nextToken();
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// Handle "." or an empty element.
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if (s.equals(".") || s.equals(""))
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continue;
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// Handle ".." by deleting the last element from the path
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if (s.equals(".."))
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{
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if (pathdepth == 0)
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continue;
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// Strip of trailing separator
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canonpath.setLength(canonpath.length() - 1/*separator.length()*/);
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String tmpstr = canonpath.toString();
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int idx = tmpstr.lastIndexOf(separator);
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if ((idx == -1) || ((idx + 1/*separator.length()*/) > tmpstr.length()))
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//throw new IOException("Can't happen error");
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return path; // Shouldn't happen
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canonpath.setLength(idx + 1/*separator.length()*/);
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pathdepth--;
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continue;
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}
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canonpath.append(s);
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pathdepth++; //now it's more than root path
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if (st.hasMoreTokens())
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canonpath.append(separator);
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}
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while (st.hasMoreTokens());
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if (endWithSeparator(path))
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canonpath.append(separator);
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String tmpstr = canonpath.toString();
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//if (pathdepth > 0 && endWithSeparator(tmpstr) )
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// tmpstr = tmpstr.substring(0, tmpstr.length() - 1/*separator.length()*/);
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return tmpstr;
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}
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/**
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* This routine canonicalizes input param "path" to formal path representation
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* for current platform, and normalize all separators to "sepchar".
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*/
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public static final String toCanonicalForm(String path, char sepchar)
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{
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String tmpstr = toCanonicalForm(path);
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tmpstr = tmpstr.replace(separatorChar, sepchar);
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return tmpstr;
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}
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/**
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* This routine checks whether input param "path" ends with separator
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*/
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public static final boolean endWithSeparator(String path)
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{
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if (path.endsWith("\\") || path.endsWith("/"))
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return true;
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return false;
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}
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/**
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* This routine removes from input param "path" the tail separator if it exists,
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* and return the remain part.
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*/
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public static final String removeTailSeparator(String path)
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{
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if (endWithSeparator(path) && !isRootDirectory(path))
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return path.substring(0, path.length() - 1);
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return path;
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}
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/**
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* This routine returns last index of separator in input param "path",
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* and return it.
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*/
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public static final int lastIndexOfSeparator(String path)
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{
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return Math.max(path.lastIndexOf("/"), path.lastIndexOf("\\"));
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}
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}
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