XMLSerializationReader.java

/*******************************************************************************
   Copyright 2013 Johannes Mitlmeier

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
******************************************************************************/
package de.fub.agg2graph.agg.tiling;

import de.fub.agg2graph.agg.AggConnection;
import de.fub.agg2graph.agg.AggContainer;
import de.fub.agg2graph.agg.AggNode;
import de.fub.agg2graph.agg.ShallowAggNode;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
 * Class for reading tiles from XML data format.
 * 
 * @author Johannes Mitlmeier
 * 
 */
public class XMLSerializationReader {
	private static Logger logger = Logger.getLogger("agg2graph.xml.read", null);

	public static void loadNodes(File path, AggContainer agg)
			throws ParserConfigurationException, SAXException, IOException {
		DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
		DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
		dbFactory.setValidating(false);
		dbFactory.setNamespaceAware(false);
		Document doc = dBuilder.parse(path);
		// doc.getDocumentElement().normalize();
		NodeList nList = doc.getElementsByTagName("n"); // nodes...
		if (logger.getLevel() != null && logger.getLevel().equals(Level.ALL)) {
			try {
				TransformerFactory factory = TransformerFactory.newInstance();
				Transformer transformer;
				transformer = factory.newTransformer();
				StringWriter writer = new StringWriter();
				Result result1 = new StreamResult(writer);
				Source source = new DOMSource(doc);
				transformer.transform(source, result1);
				writer.close();
				logger.warning(writer.toString());
			} catch (TransformerConfigurationException e) {
				e.printStackTrace();
			} catch (TransformerException e) {
				e.printStackTrace();
			}
		}

		AggNode node;
		String ID;
		Map<String, AggNode> strToNode = new java.util.HashMap<String, AggNode>();
		// make node
		double lat, lon;
		for (int i = 0; i < nList.getLength(); i++) {
			Node nNode = nList.item(i);
			if (nNode.getNodeType() != Node.ELEMENT_NODE) {
				continue;
			}
			Element eElement = (Element) nNode;
			ID = eElement.getAttribute("id");
			lat = Double.valueOf(eElement.getAttribute("lat"));
			lon = Double.valueOf(eElement.getAttribute("lon"));
			node = new AggNode(ID, lat, lon, agg); // set AggContainer later!
			logger.fine("read node (" + i + "): " + node.toDebugString());
			agg.addNode(node);
			strToNode.put(ID, node);
		}

		// make connections
		for (int i = 0; i < nList.getLength(); i++) {
			Node nNode = nList.item(i);
			if (nNode.getNodeType() != Node.ELEMENT_NODE) {
				continue;
			}
			Element eElement = (Element) nNode;
			ID = eElement.getAttribute("id");
			AggNode currentNode = strToNode.get(ID);
			NodeList children = eElement.getChildNodes();
			for (int j = 0; j < children.getLength(); j++) {
				Node childNode = children.item(j);
				if (childNode.getNodeType() != Node.ELEMENT_NODE) {
					continue;
				}
				Element childElement = (Element) childNode;
				NodeList conns = childElement.getChildNodes();
				if (childNode.getNodeName().equals("o")) {
					for (int k = 0; k < conns.getLength(); k++) {
						Node connNode = conns.item(k);
						if (connNode.getNodeType() != Node.ELEMENT_NODE
								|| !connNode.getNodeName().equals("c")) {
							continue;
						}

						Element cElem = (Element) connNode;
						AggConnection conn = null;
						AggNode toNode = strToNode
								.get(cElem.getAttribute("to"));
						if (toNode != null) {
							conn = agg.connect(currentNode, toNode);
						} else {
							String[] parts = cElem.getAttribute("to")
									.split(":");
							ShallowAggNode shallow = new ShallowAggNode(
									parts[2], Double.parseDouble(parts[0]),
									Double.parseDouble(parts[1]), agg);
							conn = agg.connect(currentNode, shallow);
						}
						if (cElem.hasAttribute("w")) {
							conn.setWeight(Float.parseFloat(cElem
									.getAttribute("w")));
						}
						if (cElem.hasAttribute("d")) {
							conn.setAvgDist(Float.parseFloat(cElem
									.getAttribute("d")));
						}
					}
				} else if (childNode.getNodeName().equals("i")) {
					for (int k = 0; k < conns.getLength(); k++) {
						Node connNode = conns.item(k);
						if (connNode.getNodeType() != Node.ELEMENT_NODE
								|| !connNode.getNodeName().equals("c")) {
							continue;
						}
						Element cElem = (Element) connNode;
						AggNode fromNode = strToNode.get(cElem
								.getAttribute("from"));
						if (fromNode != null) {
							agg.connect(fromNode, currentNode);
						} else {
							String[] parts = cElem.getAttribute("from").split(
									":");
							ShallowAggNode shallow = new ShallowAggNode(
									parts[2], Double.parseDouble(parts[0]),
									Double.parseDouble(parts[1]), agg);
							agg.connect(shallow, currentNode);
						}
					}
				}
			}
		}
	}
}