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/* EmbeddingLoader.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.graphs;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import org.grinvin.graphs.Embedding;
import org.grinvin.graphs.GraphView;
import org.grinvin.io.IOFormatException;
import org.grinvin.io.LoaderSaverHelper;
import org.jdom.Element;
/**
* Loads an <tt>embedding.xml</tt>-section from an input stream.
*/
public class EmbeddingLoader {
//
private EmbeddingLoader() { }
/**
* Construct the embedding for the current graph from the given JDOM element.
*/
private static void toEmbedding(Embedding embedding, Element element) throws IOFormatException {
int dimension = Integer.parseInt(element.getAttributeValue("dimension"));
embedding.setDimension(dimension);
GraphView graph = embedding.getPeer();
for (Object obj: element.getChildren("coordinates")) {
Element c = (Element)obj;
int id = Integer.parseInt(c.getAttributeValue("id"));
double[] coordinates = new double[dimension];
List dlist = c.getChildren("double");
for (int i=0; i < dimension; i++) {
Element d = (Element)dlist.get(i);
coordinates[i] = Double.parseDouble(d.getAttributeValue("value"));
}
embedding.setCoordinates(graph.getVertex(id), coordinates);
}
}
/**
* Load the embedding from the input stream.
*/
public static void load(Embedding embedding, InputStream input) throws IOException {
toEmbedding(embedding, LoaderSaverHelper.loadElement(input));
}
public static void loadNonValidating(Embedding embedding, InputStream input) throws IOException {
toEmbedding(embedding, LoaderSaverHelper.loadElementNonValidating(input, "embedding"));
}
public static void load(Embedding embedding, Element element) throws IOException {
toEmbedding(embedding, LoaderSaverHelper.checkElement(element, "embedding"));
}
}
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