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/* DirectorySectionLoader.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.zip.ZipFile;
/**
* Loads sections as files from a directory.
*/
public class DirectorySectionLoader implements SectionLoader {
//
private File directory;
/**
* Default constructor.
*/
public DirectorySectionLoader(File directory) {
if (! directory.isDirectory())
throw new IllegalArgumentException ("Argument must be a directory");
this.directory = directory;
}
public InputStream openSection(String name) throws IOException {
//check for a zipped graph bundle from a 1.0 workspace
int index = name.indexOf('/', 0);
if (index != -1) {
String path = name.substring(0, index);
File pathFile = new File(directory, path);
if (pathFile.isFile()) {
return new ZipFileSectionLoader(new ZipFile(pathFile)).openSection(name.substring(index+1));
}
}
File file = new File (directory, name);
if (! file.exists())
return null;
else
return new FileInputStream (file);
}
}
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