File.java 6.35 KB
Newer Older
Tom Tromey committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
// File.java - File name

/* Copyright (C) 1998, 1999  Cygnus Solutions

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package java.io;

/**
 * @author Tom Tromey <tromey@cygnus.com>
 * @date September 24, 1998 
 */

/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
 * "The Java Language Specification", ISBN 0-201-63451-1
 * Status:  Complete to version 1.1; 1.2 functionality missing.
 * A known bug: most calls to the security manager can generate
 * IOException since we use the canonical path.
 */

public class File implements Serializable
{
  public boolean canRead ()
  {
    return access (checkRead (), READ);
  }

  public boolean canWrite ()
  {
    SecurityManager s = System.getSecurityManager();
    String p = safeCanonicalPath ();
    // FIXME: it isn't entirely clear what to do if we can't find the
    // canonical path.
    if (p == null)
      return false;
    if (s != null)
      s.checkWrite(p);
    return access (p, WRITE);
  }

  private final native boolean performDelete (String canon);
  public boolean delete ()
  {
    SecurityManager s = System.getSecurityManager();
    String p = safeCanonicalPath ();
    // FIXME: what is right?
    if (p == null)
      return false;
    if (s != null)
      s.checkDelete(p);
    return performDelete (p);
  }

  public boolean equals (Object obj)
  {
    if (! (obj instanceof File))
      return false;
    File other = (File) obj;
    return path.compareTo(other.path) == 0;
  }

  public boolean exists ()
  {
    return access (checkRead (), EXISTS);
  }

  public File (String p)
  {
    if (p == null)
      throw new NullPointerException ();
    path = p;
  }

  public File (String dirPath, String name)
  {
    if (name == null)
      throw new NullPointerException ();
    if (dirPath != null)
      {
	// Try to be smart about the number of separator characters.
	if (dirPath.charAt(dirPath.length() - 1) == separatorChar)
	  path = dirPath + name;
	else
	  path = dirPath + separatorChar + name;
      }
    else
      path = name;
  }

  public File (File dir, String name)
  {
    this (dir == null ? null : dir.path, name);
  }

  public String getAbsolutePath ()
  {
    if (isAbsolute ())
      return path;
    return System.getProperty("user.dir") + separatorChar + path;
  }

  public native String getCanonicalPath () throws IOException;

  public String getName ()
  {
    int last = path.lastIndexOf(separatorChar);
111
    return path.substring(last + 1);
Tom Tromey committed
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
  }

  public String getParent ()
  {
    int last = path.lastIndexOf(separatorChar);
    if (last == -1)
      return null;
    return path.substring(0, last);
  }

  public String getPath ()
  {
    return path;
  }

  public int hashCode ()
  {
    // FIXME: test.
    return path.hashCode();
  }

  public native boolean isAbsolute ();

  public boolean isDirectory ()
  {
    return stat (checkRead (), DIRECTORY);
  }

  public boolean isFile ()
  {
    return stat (checkRead (), ISFILE);
  }

  public long lastModified ()
  {
    return attr (checkRead (), MODIFIED);
  }

  public long length ()
  {
    return attr (checkRead (), LENGTH);
  }

  private final native String[] performList (String canon,
					     FilenameFilter filter);
  public String[] list (FilenameFilter filter)
  {
    return performList (checkRead (), filter);
  }

  public String[] list ()
  {
    return performList (checkRead (), null);
  }

  public String toString ()
  {
    return path;
  }

  private final native boolean performMkdir ();
  public boolean mkdir ()
  {
    SecurityManager s = System.getSecurityManager();
    if (s != null)
      {
	// NOTE: in theory we should use the canonical path.  In
	// practice, we can't compute the canonical path until we've
	// made this completely.  Lame.
	s.checkWrite(path);
      }
    return performMkdir ();
  }

  private static boolean mkdirs (File x)
  {
    if (x.isDirectory())
      return true;
    String p = x.getPath();
191 192 193 194 195 196 197 198
    String parent = x.getParent();
    if (parent != null)
      {
	x.setPath(parent);
	if (! mkdirs (x))
	  return false;
	x.setPath(p);
      }
Tom Tromey committed
199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290
    return x.mkdir();
  }

  public boolean mkdirs ()
  {
    SecurityManager s = System.getSecurityManager();
    if (s != null)
      {
	// NOTE: in theory we should use the canonical path.  In
	// practice, we can't compute the canonical path until we've
	// made this completely.  Lame.
	s.checkWrite(path);
      }

    if (isDirectory ())
      return false;
    return mkdirs (new File (path));
  }

  private final native boolean performRenameTo (File dest);
  public boolean renameTo (File dest)
  {
    SecurityManager s = System.getSecurityManager();
    if (s != null)
      {
	// FIXME: JCL doesn't specify which path to check.  We check the
	// source since we can canonicalize it.
	s.checkWrite(safeCanonicalPath());
      }
    return performRenameTo (dest);
  }

  public static final String pathSeparator
    = System.getProperty("path.separator");
  public static final char pathSeparatorChar = pathSeparator.charAt(0);
  public static final String separator = System.getProperty("file.separator");
  public static final char separatorChar = separator.charAt(0);


  // The path.
  private String path;

  // mkdirs() uses this to avoid repeated allocations.
  private final void setPath (String n)
  {
    path = n;
  }


  private final String checkRead ()
  {
    SecurityManager s = System.getSecurityManager();
    String p = safeCanonicalPath ();
    if (p == null)
      return null;
    if (s != null)
      s.checkRead(p);
    return p;
  }

  // Return canonical path, or null.
  private final String safeCanonicalPath ()
  {
    String p = null;
    try
      {
	p = getCanonicalPath ();
      }
    catch (IOException x)
      {
	// Nothing.
      }
    return p;
  }

  // QUERY arguments to access function.
  private final static int READ = 0;
  private final static int WRITE = 1;
  private final static int EXISTS = 2;

  // QUERY arguments to stat function.
  private final static int DIRECTORY = 0;
  private final static int ISFILE = 1;

  // QUERY arguments to attr function.
  private final static int MODIFIED = 0;
  private final static int LENGTH = 1;

  private final native long attr (String p, int query);
  private final native boolean access (String p, int query);
  private final native boolean stat (String p, int query);
}