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/* GraphLoader_1_0.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.compat;
import java.io.IOException;
import java.io.InputStream;
import org.grinvin.graphs.Annotation;
import org.grinvin.graphs.Edge;
import org.grinvin.graphs.Graph;
import org.grinvin.graphs.Vertex;
import org.grinvin.io.IOFormatException;
import org.grinvin.io.LoaderSaverHelper;
import org.jdom.Element;
/**
* Loads an old (1.0) <tt>graph.xml</tt>-section from an input stream.
*/
public class GraphLoader_1_0 {
//
private GraphLoader_1_0() { }
/**
* Construct the abstract graph from the given JDOM element
* and fill the translation table.
*/
private static void toGraph(Graph graph, Annotation annotation, Element element) throws IOFormatException {
int numberOfVertices = Integer.parseInt(element.getAttributeValue("nrofvertices"));
// annotations
String[] annotations = new String[numberOfVertices];
for (Object obj: element.getChildren("vertex")) {
Element v = (Element)obj;
int id = Integer.parseInt(v.getAttributeValue("id"));
annotations[id] = v.getAttributeValue("annotation");
}
// vertices
Vertex[] vertices = new Vertex[numberOfVertices];
for (int i=0; i < numberOfVertices; i++) {
vertices[i] = graph.addNewVertex();
annotation.setAnnotation(vertices[i], annotations[i]);
}
// edges
for (Object obj: element.getChildren("edge")) {
Element e = (Element)obj;
int first = Integer.parseInt(e.getAttributeValue("from"));
int second = Integer.parseInt(e.getAttributeValue("to"));
Edge edge = graph.addNewEdge(vertices[first], vertices[second]);
annotation.setAnnotation(edge, e.getAttributeValue("annotation"));
}
}
/**
* Load the graph from the input stream. After the call the input stream
* should no longer be used.
*/
public static void load(Graph graph, Annotation annotation, InputStream input) throws IOException {
toGraph(graph, annotation, LoaderSaverHelper.loadElementNonValidating(input, "graph"));
}
public static void load(Graph graph, Annotation annotation, Element element) throws IOException {
toGraph(graph, annotation, LoaderSaverHelper.checkElement(element, "graph"));
}
}
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