428 lines
10 KiB
Java
428 lines
10 KiB
Java
// File.java - File name
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/* Copyright (C) 1998, 1999, 2000 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 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 1.1; 1.2 functionality missing.
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* A known bug: most calls to the security manager can generate
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* IOException since we use the canonical path.
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*/
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public class File implements Serializable
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{
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public boolean canRead ()
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{
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return access (checkRead (), READ);
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}
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public boolean canWrite ()
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{
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SecurityManager s = System.getSecurityManager();
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String p = safeCanonicalPath ();
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// FIXME: it isn't entirely clear what to do if we can't find the
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// canonical path.
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if (p == null)
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return false;
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if (s != null)
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s.checkWrite(p);
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return access (p, WRITE);
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}
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private final native static boolean performDelete (String canon);
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public boolean delete ()
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{
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SecurityManager s = System.getSecurityManager();
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String p = safeCanonicalPath ();
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// FIXME: what is right?
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if (p == null)
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return false;
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if (s != null)
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s.checkDelete(p);
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return performDelete (p);
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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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return path.compareTo(other.path) == 0;
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}
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public boolean exists ()
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{
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return access (checkRead (), EXISTS);
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}
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public File (String p)
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{
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if (p == null)
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throw new NullPointerException ();
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path = p;
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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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path = dirPath + name;
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else
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path = dirPath + separatorChar + name;
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}
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else
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path = 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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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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public native String getCanonicalPath () throws IOException;
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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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return path.substring(0, last);
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}
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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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// FIXME: test.
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return path.hashCode();
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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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return stat (checkRead (), DIRECTORY);
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}
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public boolean isFile ()
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{
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return stat (checkRead (), ISFILE);
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}
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public long lastModified ()
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{
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return attr (checkRead (), MODIFIED);
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}
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public long length ()
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{
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return attr (checkRead (), LENGTH);
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}
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private final native String[] performList (String canon,
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FilenameFilter filter);
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public String[] list (FilenameFilter filter)
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{
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return performList (checkRead (), filter);
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}
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public String[] list ()
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{
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return performList (checkRead (), null);
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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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private final native boolean performMkdir ();
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public boolean mkdir ()
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{
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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{
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// NOTE: in theory we should use the canonical path. In
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// practice, we can't compute the canonical path until we've
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// made this completely. Lame.
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s.checkWrite(path);
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}
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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.setPath(parent);
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if (! mkdirs (x))
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return false;
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x.setPath(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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SecurityManager s = System.getSecurityManager();
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if (s != null)
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{
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// NOTE: in theory we should use the canonical path. In
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// practice, we can't compute the canonical path until we've
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// made this completely. Lame.
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s.checkWrite(path);
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}
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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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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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// FIXME: filename length varies by architecture and filesystem.
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int max_length = 255;
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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 () > max_length)
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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 > max_length)
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prefix = prefix.substring(0, max_length - 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.exists())
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continue;
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else
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{
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String af = f.getAbsolutePath ();
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// Check to see if we're allowed to write to it.
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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s.checkWrite (af);
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// Now create the file.
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FileDescriptor fd =
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new FileDescriptor (af,
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FileDescriptor.WRITE
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| FileDescriptor.EXCL);
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fd.close ();
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return f;
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}
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}
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catch (IOException _)
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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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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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private final 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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if (s != null)
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{
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// FIXME: JCL doesn't specify which path to check. We check the
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// source since we can canonicalize it.
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s.checkWrite(safeCanonicalPath());
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}
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return performRenameTo (dest);
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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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private static final String tmpdir = System.getProperty("java.io.tmpdir");
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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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// mkdirs() uses this to avoid repeated allocations.
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private final void setPath (String n)
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{
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path = n;
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}
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private final String checkRead ()
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{
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SecurityManager s = System.getSecurityManager();
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String p = safeCanonicalPath ();
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if (p == null)
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return null;
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if (s != null)
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s.checkRead(p);
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return p;
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}
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// Return canonical path, or null.
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private final String safeCanonicalPath ()
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{
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String p = null;
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try
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{
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p = getCanonicalPath ();
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}
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catch (IOException x)
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{
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// Nothing.
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}
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return p;
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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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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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// 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 (String p, int query);
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private final native boolean access (String p, int query);
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private final native boolean stat (String p, int query);
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private static final long serialVersionUID = 301077366599181567L;
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}
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