diff options
Diffstat (limited to 'libjava/java/io/File.java')
| -rw-r--r-- | libjava/java/io/File.java | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/libjava/java/io/File.java b/libjava/java/io/File.java index 33776ab..0026ffa 100644 --- a/libjava/java/io/File.java +++ b/libjava/java/io/File.java @@ -67,6 +67,7 @@ public class File implements Serializable, Comparable private final static int READ = 0; private final static int WRITE = 1; private final static int EXISTS = 2; + private final static int EXEC = 3; // QUERY arguments to stat function. private final static int DIRECTORY = 0; @@ -182,6 +183,27 @@ public class File implements Serializable, Comparable return _access (WRITE); } + /** + * This method tests whether or not the current thread is allowed to + * to execute the file pointed to by this object. This will be true if and + * and only if 1) the file exists and 2) the <code>SecurityManager</code> + * (if any) allows access to the file via it's <code>checkExec</code> + * method 3) the file is executable. + * + * @return <code>true</code> if execution is allowed, + * <code>false</code> otherwise + * + * @exception SecurityException If the <code>SecurityManager</code> + * does not allow access to the file + */ + public boolean canExecute() + { + if (!exists()) + return false; + checkExec(); + return _access (EXEC); + } + private native boolean performCreate() throws IOException; /** @@ -1139,6 +1161,159 @@ public class File implements Serializable, Comparable } /* + * This native method sets file permissions. + */ + private native boolean setFilePermissions(boolean enable, boolean ownerOnly, + int permissions); + + /** + * This method sets the owner's read permission for the File represented by + * this object. + * + * It is the same as calling <code>setReadable(readable, true)</code>. + * + * @param <code>readable</code> <code>true</code> to set read permission, + * <code>false</code> to unset the read permission. + * @return <code>true</code> if the file permissions are changed, + * <code>false</code> otherwise. + * @exception SecurityException If write access of the file is not permitted. + * @see #setReadable(boolean, boolean) + * @since 1.6 + */ + public boolean setReadable(boolean readable) + { + return setReadable(readable, true); + } + + /** + * This method sets the read permissions for the File represented by + * this object. + * + * If <code>ownerOnly</code> is set to <code>true</code> then only the + * read permission bit for the owner of the file is changed. + * + * If <code>ownerOnly</code> is set to <code>false</code>, the file + * permissions are changed so that the file can be read by everyone. + * + * On unix like systems this sets the <code>user</code>, <code>group</code> + * and <code>other</code> read bits and is equal to call + * <code>chmod a+r</code> on the file. + * + * @param <code>readable</code> <code>true</code> to set read permission, + * <code>false</code> to unset the read permission. + * @param <code>ownerOnly</code> <code>true</code> to set read permission + * for owner only, <code>false</code> for all. + * @return <code>true</code> if the file permissions are changed, + * <code>false</code> otherwise. + * @exception SecurityException If write access of the file is not permitted. + * @see #setReadable(boolean) + * @since 1.6 + */ + public boolean setReadable(boolean readable, boolean ownerOnly) + { + checkWrite(); + return setFilePermissions(readable, ownerOnly, READ); + } + + /** + * This method sets the owner's write permission for the File represented by + * this object. + * + * It is the same as calling <code>setWritable(readable, true)</code>. + * + * @param <code>writable</code> <code>true</code> to set write permission, + * <code>false</code> to unset write permission. + * @return <code>true</code> if the file permissions are changed, + * <code>false</code> otherwise. + * @exception SecurityException If write access of the file is not permitted. + * @see #setWritable(boolean, boolean) + * @since 1.6 + */ + public boolean setWritable(boolean writable) + { + return setWritable(writable, true); + } + + /** + * This method sets the write permissions for the File represented by + * this object. + * + * If <code>ownerOnly</code> is set to <code>true</code> then only the + * write permission bit for the owner of the file is changed. + * + * If <code>ownerOnly</code> is set to <code>false</code>, the file + * permissions are changed so that the file can be written by everyone. + * + * On unix like systems this set the <code>user</code>, <code>group</code> + * and <code>other</code> write bits and is equal to call + * <code>chmod a+w</code> on the file. + * + * @param <code>writable</code> <code>true</code> to set write permission, + * <code>false</code> to unset write permission. + * @param <code>ownerOnly</code> <code>true</code> to set write permission + * for owner only, <code>false</code> for all. + * @return <code>true</code> if the file permissions are changed, + * <code>false</code> otherwise. + * @exception SecurityException If write access of the file is not permitted. + * @see #setWritable(boolean) + * @since 1.6 + */ + public boolean setWritable(boolean writable, boolean ownerOnly) + { + checkWrite(); + return setFilePermissions(writable, ownerOnly, WRITE); + } + + /** + * This method sets the owner's execute permission for the File represented + * by this object. + * + * It is the same as calling <code>setExecutable(readable, true)</code>. + * + * @param <code>executable</code> <code>true</code> to set execute permission, + * <code>false</code> to unset execute permission. + * @return <code>true</code> if the file permissions are changed, + * <code>false</code> otherwise. + * @exception SecurityException If write access of the file is not permitted. + * @see #setExecutable(boolean, boolean) + * @since 1.6 + */ + public boolean setExecutable(boolean executable) + { + return setExecutable(executable, true); + } + + /** + * This method sets the execute permissions for the File represented by + * this object. + * + * If <code>ownerOnly</code> is set to <code>true</code> then only the + * execute permission bit for the owner of the file is changed. + * + * If <code>ownerOnly</code> is set to <code>false</code>, the file + * permissions are changed so that the file can be executed by everyone. + * + * On unix like systems this set the <code>user</code>, <code>group</code> + * and <code>other</code> write bits and is equal to call + * <code>chmod a+x</code> on the file. + * + * @param <code>executable</code> <code>true</code> to set write permission, + * <code>false</code> to unset write permission. + * @param <code>ownerOnly</code> <code>true</code> to set write permission + * for owner only, <code>false</code> for all. + * @return <code>true</code> if the file permissions are changed, + * <code>false</code> otherwise. + * @exception SecurityException If write access of the file is not permitted. + * @see #setExecutable(boolean) + * @since 1.6 + */ + public boolean setExecutable(boolean executable, boolean ownerOnly) + { + checkWrite(); + return setFilePermissions(executable, ownerOnly, EXEC); + } + + /* * This native method sets the permissions to make the file read only. */ private native boolean performSetReadOnly(); @@ -1372,6 +1547,15 @@ public class File implements Serializable, Comparable s.checkRead(path); } + private void checkExec() + { + // Check the SecurityManager + SecurityManager s = System.getSecurityManager(); + + if (s != null) + s.checkExec(path); + } + /** * Calling this method requests that the file represented by this object * be deleted when the virtual machine exits. Note that this request cannot |