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/* WorkspaceLoader.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.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipInputStream;
import org.grinvin.workspace.WindowSubsystem;
import org.grinvin.workspace.Workspace;
import org.grinvin.workspace.WorkspaceException;
import org.jdom.Element;
import org.jdom.JDOMException;
/**
* Loads workspaces from disk.
*/
public class WorkspaceLoader {
//
private static final Logger LOGGER
= Logger.getLogger("org.grinvin.workspace", "org.grinvin.workspace.resources");
//
private Workspace workspace;
//
private SectionLoader sloader;
// meta-information stored in the file
private Properties meta;
private WorkspaceLoader(Workspace workspace, SectionLoader sloader) {
this.workspace = workspace;
this.sloader = sloader;
}
/**
* Load the meta-information for the workspace.
*/
private void loadMeta() throws IOException {
meta = new Properties();
InputStream in = sloader.openSection("meta-info.xml");
if (in != null) {
meta.loadFromXML(in);
in.close();
} else {
// when meta-info does not exist, we have a grinvin-1.0 workspace
meta.setProperty("version", "1.0");
}
}
/**
* Load the workspace from the given workspace file. If there
* is an active workspace already, it is first saved and then disposed of.
*/
private void load() throws IOException, JDOMException, WorkspaceException {
if (workspace.getLocation() != null) {
WorkspaceSaver.save(workspace);
workspace.dispose();
}
loadMeta();
if (meta.getProperty("version").equals("1.0")) {
InputStream input = sloader.openSection("meta.xml");
Element root = LoaderSaverHelper.loadElementNonValidating(input, "workspace");
for (Subsystem subsystem : workspace.subsystems)
if (subsystem instanceof WindowSubsystem)
((WindowSubsystem)subsystem).load_1_0(root, sloader);
} else {
InputStream input = sloader.openSection("workspace.xml");
Element root = LoaderSaverHelper.loadElement(input);
// in order of registration
for (Subsystem subsystem : workspace.subsystems)
subsystem.load(root, sloader);
}
}
/**
* Load the workspace from the given workspace file. If there
* is an active workspace already, it is first saved and then disposed of.
*/
public static void load(Workspace workspace, File file) throws WorkspaceException {
try {
FileInputStream in = new FileInputStream(file);
ZipInputStream zip = new ZipInputStream(in);
WorkspaceLoader loader = new WorkspaceLoader(workspace, new ZipInputStreamSectionLoader(zip));
loader.load();
workspace.setLocation(file);
LOGGER.log(Level.INFO, "log.loaded.workspace", file);
} catch (IOException ex) {
throw new WorkspaceException("I/O error while loading workspace",
file, ex);
} catch (JDOMException ex) {
throw new WorkspaceException("I/O format error in meta.xml",
file, ex);
}
}
/**
* Load the workspace from the given workspace directory. If there
* is an active workspace already, it is first saved and then disposed of.
*/
public static void loadFromDirectory(Workspace workspace, File directory) throws WorkspaceException {
try {
WorkspaceLoader loader = new WorkspaceLoader(workspace, new DirectorySectionLoader(directory));
loader.load();
workspace.setLocation(directory);
LOGGER.log(Level.INFO, "log.loaded.workspace", directory);
} catch (IOException ex) {
throw new WorkspaceException("I/O error while loading workspace",
directory, ex);
} catch (JDOMException ex) {
throw new WorkspaceException("I/O format error in meta.xml",
directory, ex);
}
}
}
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