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/* LoaderSaverHelper.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.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import org.grinvin.graphs.GraphURI;
import org.grinvin.list.HasURI;
import org.grinvin.preferences.GrinvinPreferences;
import org.grinvin.util.IOHelper;
import org.grinvin.xml.XMLUtils;
import org.jdom.DocType;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.output.XMLOutputter;
/**
*
*/
public class LoaderSaverHelper {
private LoaderSaverHelper() {
}
//
public static String prepareSessionURI(HasURI hasURI, String prefix, String extension) {
URI uri = hasURI.getURI();
if (!GraphURI.isSession(uri)) {
throw new IllegalArgumentException("Can only save session objects into the workspace");
}
if (uri == null) {
String name = prefix + "/" + IOHelper.uniqueFileName("GIO", "." + extension);
try {
uri = GraphURI.createSession(name);
hasURI.setURI(uri);
} catch (URISyntaxException e) {
assert false : "Unexpected URISyntaxException";
}
}
return uri.getSchemeSpecificPart();
}
public static Element loadElement(InputStream input) throws IOException {
try {
return XMLUtils.loadFromInputStream(input);
} catch (JDOMException ex) {
throw new IOFormatException("XML parse error", ex);
}
}
public static Document loadDocument(InputStream input) throws IOException {
try {
return XMLUtils.loadDocumentFromInputStream(input);
} catch (JDOMException ex) {
throw new IOFormatException("XML parse error", ex);
}
}
public static Element loadElementNonValidating(InputStream input, String rootElement) throws IOException {
try {
return checkElement(XMLUtils.loadFromInputStreamNonValidating(input), rootElement);
} catch (JDOMException ex) {
throw new IOFormatException("XML parse error", ex);
}
}
public static Element checkElement(Element element, String rootElement) throws IOFormatException {
if (!rootElement.equals(element.getName())) {
throw new IOFormatException("Expected '" + rootElement + "' element");
}
return element;
}
//
private static XMLOutputter outputter = null;
//
private static XMLOutputter getOutputter() {
if (outputter == null) {
outputter = new XMLOutputter(GrinvinPreferences.getInstance().getPreferredXMLFormat());
}
return outputter;
}
//
public static void outputXML(Element element, DocType docType, OutputStream out) throws IOException {
Document document = new Document(element);
if (document != null) {
document.setDocType(docType);
}
getOutputter().output(document, out);
}
public static void outputXML(Element element, OutputStream out) throws IOException {
outputXML(element, null, out);
}
}
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