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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;
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();
}
}
}
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