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/* Workspace.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program 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
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.workspace;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.logging.Logger;
import org.grinvin.io.Subsystem;
import org.grinvin.io.WorkspaceSaver;
import org.grinvin.preferences.GrinvinPreferences;
import org.grinvin.preferences.GrinvinPreferences.Preference;
/**
* Handles session persistence. The singleton object of this type
* allows sessions to be persisted to a workspace directory on disk.
*/
public class Workspace {
//
private static final Logger LOGGER
= Logger.getLogger("org.grinvin.workspace", "org.grinvin.workspace.resources");
//
private File location;
//
public List<Subsystem> subsystems;
//
private List<WorkspaceListener> listeners;
//
private Workspace() {
this.location = null;
this.subsystems = new ArrayList<Subsystem>();
listeners = new ArrayList<WorkspaceListener>();
}
//
private static final Workspace SINGLETON = new Workspace();
/**
* Get the singleton instance of this class
* @return the single instance of this class
*/
public static Workspace getInstance() {
return SINGLETON;
}
//
public File getLocation() {
return location;
}
// changes location and remembers it as a preference
public void setLocation(File location) {
this.location = location;
GrinvinPreferences.getInstance().setStringPreference(
Preference.WORKSPACE_LOCATION,
location.getAbsolutePath());
fireLocationChanged();
}
//
public void addWorkspaceListener(WorkspaceListener listener) {
listeners.add(listener);
}
//
public void removeWorkspaceListener(WorkspaceListener listener) {
listeners.remove(listener);
}
//
public void fireLocationChanged() {
for (WorkspaceListener listener : listeners)
listener.locationChanged();
}
/**
* Register (the wrapper) of a subsystem. The subsystem that is registered
* first is also loaded and initialized first, but disposed and saved last.
* If a subsystem A depends on a subsystem B, then B should be registered
* before A.
* @throws IllegalStateException when called after
* a workspace location has already been set
*/
public void registerSubsystem(Subsystem subsystem) {
if (location != null)
throw new IllegalStateException("Cannot register a subsystem in a running system");
subsystems.add(subsystem);
}
//
public void dispose() {
if (this.location != null) {
// in reverse order
for (ListIterator<Subsystem> iter = subsystems.listIterator(subsystems.size());
iter.hasPrevious(); )
iter.previous().dispose();
}
this.location = null;
}
/**
* Initialize all subsystems and perform an initial save into the
* given workspace directory. If there is an active workspace already,
* it is disposed of first. If the new directory already exists,
* all its contents are removed.
*/
public void newWorkspace(File location) throws WorkspaceException {
dispose();
// in order of registration
for (Subsystem subsystem : subsystems)
subsystem.init();
WorkspaceSaver.saveAs(this, location);
}
}
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