d281f2a236
Fix for PR libgcj/4481: * java/io/File.java (getParent): Handle case where path is "/". (normalizePath): Use correct string for UNC leader. From-SVN: r46093
581 lines
13 KiB
Java
581 lines
13 KiB
Java
// File.java - File name
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/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.io;
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import java.util.*;
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import java.net.*;
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import gnu.gcj.runtime.FileDeleter;
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/**
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* @author Tom Tromey <tromey@cygnus.com>
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* @date September 24, 1998
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*/
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* Status: Complete to version 1.3.
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*/
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public class File implements Serializable, Comparable
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{
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public boolean canRead ()
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{
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checkRead();
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return _access (READ);
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}
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public boolean canWrite ()
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{
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checkWrite();
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return _access (WRITE);
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}
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private native boolean performCreate() throws IOException;
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/** @since 1.2 */
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public boolean createNewFile() throws IOException
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{
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checkWrite();
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return performCreate();
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}
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private native boolean performDelete ();
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public boolean delete ()
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{
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SecurityManager s = System.getSecurityManager();
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String name = path;
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if (s != null)
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s.checkDelete(path);
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return performDelete ();
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}
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public boolean equals (Object obj)
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{
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if (! (obj instanceof File))
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return false;
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File other = (File) obj;
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if (caseSensitive)
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return (path.equals(other.path));
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else
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return (path.equalsIgnoreCase(other.path));
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}
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public boolean exists ()
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{
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checkRead();
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return _access (EXISTS);
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}
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public File (String p)
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{
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path = normalizePath(p);
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}
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// Remove duplicate and redundant separator characters.
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private String normalizePath(String p)
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{
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int dupIndex = p.indexOf(dupSeparator);
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int plen = p.length();
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// Special case: permit Windows UNC path prefix.
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if (dupSeparator.equals("\\\\") && dupIndex == 0)
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dupIndex = p.indexOf(dupSeparator, 1);
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if (dupIndex == -1)
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{
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// Ignore trailing separator.
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if (plen > 1 && p.charAt(plen - 1) == separatorChar)
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return p.substring(0, plen - 1);
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else
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return p;
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}
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StringBuffer newpath = new StringBuffer(plen);
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int last = 0;
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while (dupIndex != -1)
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{
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newpath.append(p.substring(last, dupIndex));
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// Ignore the duplicate path characters.
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while (p.charAt(dupIndex) == separatorChar)
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{
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dupIndex++;
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if (dupIndex == plen)
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return newpath.toString();
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}
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newpath.append(separatorChar);
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last = dupIndex;
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dupIndex = p.indexOf(dupSeparator, last);
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}
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// Again, ignore possible trailing separator.
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int end;
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if (plen > 1 && p.charAt(plen - 1) == separatorChar)
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end = plen - 1;
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else
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end = plen;
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newpath.append(p.substring(last, end));
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return newpath.toString();
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}
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public File (String dirPath, String name)
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{
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if (name == null)
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throw new NullPointerException ();
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if (dirPath != null && dirPath.length() > 0)
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{
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// Try to be smart about the number of separator characters.
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if (dirPath.charAt(dirPath.length() - 1) == separatorChar
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|| name.length() == 0)
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path = normalizePath(dirPath + name);
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else
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path = normalizePath(dirPath + separatorChar + name);
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}
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else
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path = normalizePath(name);
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}
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public File (File dir, String name)
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{
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this (dir == null ? null : dir.path, name);
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}
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// FIXME ???
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public String getAbsolutePath ()
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{
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if (isAbsolute ())
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return path;
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return System.getProperty("user.dir") + separatorChar + path;
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}
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/** @since 1.2 */
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public File getAbsoluteFile ()
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{
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return new File (getAbsolutePath());
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}
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public native String getCanonicalPath () throws IOException;
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/** @since 1.2 */
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public File getCanonicalFile () throws IOException
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{
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return new File (getCanonicalPath());
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}
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public String getName ()
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{
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int last = path.lastIndexOf(separatorChar);
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return path.substring(last + 1);
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}
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public String getParent ()
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{
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int last = path.lastIndexOf(separatorChar);
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if (last == -1)
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return null;
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// FIXME: POSIX assumption.
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if (last == 0 && path.charAt (0) == '/')
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++last;
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return path.substring(0, last);
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}
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/** @since 1.2 */
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public File getParentFile ()
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{
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String parent = getParent ();
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return (parent == null ? null : new File (parent));
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}
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public String getPath ()
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{
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return path;
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}
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public int hashCode ()
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{
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if (caseSensitive)
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return (path.hashCode() ^ 1234321);
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else
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return (path.toLowerCase().hashCode() ^ 1234321);
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}
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public native boolean isAbsolute ();
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public boolean isDirectory ()
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{
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checkRead();
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return _stat (DIRECTORY);
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}
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public boolean isFile ()
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{
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checkRead();
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return _stat (ISFILE);
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}
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/** @since 1.2 */
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public boolean isHidden()
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{
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checkRead();
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return _stat (ISHIDDEN);
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}
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public long lastModified ()
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{
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checkRead();
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return attr (MODIFIED);
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}
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public long length ()
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{
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checkRead();
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return attr (LENGTH);
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}
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private final native Object[] performList (FilenameFilter filter,
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FileFilter fileFilter,
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Class result_type);
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public String[] list (FilenameFilter filter)
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{
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checkRead();
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return (String[]) performList (filter, null, String.class);
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}
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public String[] list ()
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{
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checkRead();
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return (String[]) performList (null, null, String.class);
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}
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/** @since 1.2 */
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public File[] listFiles()
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{
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checkRead();
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return (File[]) performList (null, null, File.class);
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}
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/** @since 1.2 */
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public File[] listFiles(FilenameFilter filter)
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{
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checkRead();
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return (File[]) performList (filter, null, File.class);
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}
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/** @since 1.2 */
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public File[] listFiles(FileFilter filter)
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{
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checkRead();
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return (File[]) performList (null, filter, File.class);
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}
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public String toString ()
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{
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return path;
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}
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public URL toURL () throws MalformedURLException
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{
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return new URL ("file://" + getAbsolutePath ()
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+ (isDirectory() ? "/" : ""));
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}
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private final native boolean performMkdir ();
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public boolean mkdir ()
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{
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checkWrite();
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return performMkdir ();
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}
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private static boolean mkdirs (File x)
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{
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if (x.isDirectory())
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return true;
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String p = x.getPath();
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String parent = x.getParent();
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if (parent != null)
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{
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x.path = parent;
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if (! mkdirs (x))
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return false;
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x.path = p;
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}
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return x.mkdir();
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}
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public boolean mkdirs ()
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{
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checkWrite();
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if (isDirectory ())
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return false;
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return mkdirs (new File (path));
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}
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private static synchronized String nextValue ()
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{
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return Long.toString(counter++, Character.MAX_RADIX);
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}
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/** @since 1.2 */
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public static File createTempFile (String prefix, String suffix,
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File directory)
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throws IOException
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{
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// Grab the system temp directory if necessary
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if (directory == null)
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{
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String dirname = tmpdir;
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if (dirname == null)
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throw
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new IOException("Cannot determine system temporary directory");
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directory = new File(dirname);
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if (!directory.exists())
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throw new IOException("System temporary directory "
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+ directory.getName() + " does not exist.");
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if (!directory.isDirectory())
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throw new IOException("System temporary directory "
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+ directory.getName()
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+ " is not really a directory.");
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}
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if (prefix.length () < 3)
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throw new IllegalArgumentException ("Prefix too short: " + prefix);
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if (suffix == null)
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suffix = ".tmp";
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// Truncation rules.
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// `6' is the number of characters we generate.
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if (prefix.length () + 6 + suffix.length () > maxPathLen)
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{
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int suf_len = 0;
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if (suffix.charAt(0) == '.')
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suf_len = 4;
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suffix = suffix.substring(0, suf_len);
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if (prefix.length () + 6 + suf_len > maxPathLen)
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prefix = prefix.substring(0, maxPathLen - 6 - suf_len);
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}
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File f;
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// How many times should we try? We choose 100.
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for (int i = 0; i < 100; ++i)
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{
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// This is ugly.
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String t = "ZZZZZZ" + nextValue ();
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String l = prefix + t.substring(t.length() - 6) + suffix;
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try
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{
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f = new File(directory, l);
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if (f.createNewFile())
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return f;
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}
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catch (IOException ignored)
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{
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}
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}
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throw new IOException ("cannot create temporary file");
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}
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private native boolean performSetReadOnly();
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/** @since 1.2 */
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public boolean setReadOnly()
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{
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checkWrite();
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return performSetReadOnly();
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}
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private static native File[] performListRoots();
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/** @since 1.2 */
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public static File[] listRoots()
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{
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File[] roots = performListRoots();
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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{
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// Only return roots to which the security manager permits read access.
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int count = roots.length;
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for (int i = 0; i < roots.length; i++)
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{
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try
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{
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s.checkRead(roots[i].path);
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}
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catch (SecurityException sx)
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{
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roots[i] = null;
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count--;
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}
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}
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if (count != roots.length)
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{
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File[] newRoots = new File[count];
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int k = 0;
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for (int i=0; i < roots.length; i++)
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{
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if (roots[i] != null)
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newRoots[k++] = roots[i];
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}
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roots = newRoots;
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}
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}
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return roots;
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}
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public static File createTempFile (String prefix, String suffix)
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throws IOException
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{
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return createTempFile (prefix, suffix, null);
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}
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/** @since 1.2 */
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public int compareTo(File other)
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{
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if (caseSensitive)
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return path.compareTo (other.path);
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else
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return path.compareToIgnoreCase (other.path);
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}
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/** @since 1.2 */
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public int compareTo(Object o)
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{
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File other = (File) o;
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return compareTo (other);
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}
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private native boolean performRenameTo (File dest);
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public boolean renameTo (File dest)
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{
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SecurityManager s = System.getSecurityManager();
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String sname = getName();
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String dname = dest.getName();
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if (s != null)
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{
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s.checkWrite(sname);
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s.checkWrite(dname);
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}
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return performRenameTo (dest);
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}
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private native boolean performSetLastModified(long time);
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/** @since 1.2 */
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public boolean setLastModified(long time)
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{
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checkWrite();
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return performSetLastModified(time);
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}
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public static final String pathSeparator
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= System.getProperty("path.separator");
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public static final char pathSeparatorChar = pathSeparator.charAt(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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static final String tmpdir = System.getProperty("java.io.tmpdir");
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static int maxPathLen;
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static boolean caseSensitive;
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static String dupSeparator = separator + separator;
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static
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{
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init_native();
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}
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// Native function called at class initialization. This should should
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// set the maxPathLen and caseSensitive variables.
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private static native void init_native();
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// The path.
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private String path;
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// We keep a counter for use by createTempFile. We choose the first
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// value randomly to try to avoid clashes with other VMs.
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private static long counter = Double.doubleToLongBits (Math.random ());
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private void checkWrite ()
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{
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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s.checkWrite(path);
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}
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private void checkRead ()
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{
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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s.checkRead(path);
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}
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/**
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* Add this File to the set of files to be deleted upon normal
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* termination.
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*
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* @since 1.2
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*/
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// FIXME: This should use the ShutdownHook API once we implement that.
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public void deleteOnExit ()
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{
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SecurityManager sm = System.getSecurityManager ();
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if (sm != null)
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sm.checkDelete (getName ());
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FileDeleter.add (this);
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}
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private void writeObject (ObjectOutputStream oos) throws IOException
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{
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oos.defaultWriteObject ();
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oos.writeChar (separatorChar);
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}
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private void readObject (ObjectInputStream ois)
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throws ClassNotFoundException, IOException
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{
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ois.defaultReadObject ();
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// If the file was from an OS with a different dir separator,
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// fixup the path to use the separator on this OS.
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char oldSeparatorChar = ois.readChar ();
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if (oldSeparatorChar != separatorChar)
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path = path.replace (oldSeparatorChar, separatorChar);
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}
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// QUERY arguments to access function.
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private final static int READ = 0;
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private final static int WRITE = 1;
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private final static int EXISTS = 2;
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// QUERY arguments to stat function.
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private final static int DIRECTORY = 0;
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private final static int ISFILE = 1;
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private final static int ISHIDDEN = 2;
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// QUERY arguments to attr function.
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private final static int MODIFIED = 0;
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private final static int LENGTH = 1;
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private final native long attr (int query);
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// On OSF1 V5.0, `stat' is a macro. It is easiest to use the name
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// `_stat' instead. We do the same thing for `_access' just in
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// case.
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private final native boolean _access (int query);
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private final native boolean _stat (int query);
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private static final long serialVersionUID = 301077366599181567L;
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}
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