1 files changed, 53 insertions, 0 deletions
diff --git a/src/main/java/de/waldheinz/fs/FsObject.java b/src/main/java/de/waldheinz/fs/FsObject.java
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+++ b/src/main/java/de/waldheinz/fs/FsObject.java
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+/*
+ * Copyright (C) 2003-2009 JNode.org
+ *               2009,2010 Matthias Treydte <mt@waldheinz.de>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; If not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+ 
+package de.waldheinz.fs;
+
+/**
+ * This interface is the base interface for objects that are part of a
+ * {@link FileSystem}.
+ * 
+ * @author Ewout Prangsma &lt;epr at jnode.org&gt;
+ * @author Matthias Treydte &lt;waldheinz at gmail.com&gt;
+ */
+public interface FsObject {
+    
+    /**
+     * Checks if this {@code FsObject} is still valid.
+     * 
+     * An object is not valid anymore if it has been removed from the
+     * filesystem. All invocations on methods (except this method and the
+     * methods inherited from {@link java.lang.Object}) of
+     * invalid objects must throw an {@link IllegalStateException}.
+     * 
+     * @return if this {@code FsObject} is still valid
+     */
+    public boolean isValid();
+    
+    /**
+     * Checks if this {@code FsObject} is read-only. Any attempt to modify a
+     * read-only {@code FsObject} must result in a {@link ReadOnlyException}
+     * being thrown, and the modification must not be performed.
+     *
+     * @return if this {@code FsObject} is read-only
+     * @since 0.6
+     */
+    public boolean isReadOnly();
+    
+}