| /* |
| * 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; |
| |
| import java.io.IOException; |
| |
| /** |
| * Abstract class with common things in different FileSystem implementations. |
| * |
| * @author Fabien DUMINY |
| * @author Matthias Treydte <waldheinz at gmail.com> |
| */ |
| public abstract class AbstractFileSystem implements FileSystem { |
| private final boolean readOnly; |
| private boolean closed; |
| |
| /** |
| * Creates a new {@code AbstractFileSystem}. |
| * |
| * @param readOnly if the file system should be read-only |
| */ |
| public AbstractFileSystem(boolean readOnly) { |
| this.closed = false; |
| this.readOnly = readOnly; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (!isClosed()) { |
| if (!isReadOnly()) { |
| flush(); |
| } |
| |
| closed = true; |
| } |
| } |
| |
| @Override |
| public final boolean isClosed() { |
| return closed; |
| } |
| |
| @Override |
| public final boolean isReadOnly() { |
| return readOnly; |
| } |
| |
| /** |
| * Checks if this {@code FileSystem} was already closed, and throws an |
| * exception if it was. |
| * |
| * @throws IllegalStateException if this {@code FileSystem} was |
| * already closed |
| * @see #isClosed() |
| * @see #close() |
| */ |
| protected final void checkClosed() throws IllegalStateException { |
| if (isClosed()) { |
| throw new IllegalStateException("file system was already closed"); |
| } |
| } |
| |
| /** |
| * Checks if this {@code FileSystem} is read-only, and throws an |
| * exception if it is. |
| * |
| * @throws ReadOnlyException if this {@code FileSystem} is read-only |
| * @see #isReadOnly() |
| */ |
| protected final void checkReadOnly() throws ReadOnlyException { |
| if (isReadOnly()) { |
| throw new ReadOnlyException(); |
| } |
| } |
| } |