org.opennaas.extensions.router.model.utils.OpticalSwitchTopologyLoader.java Source code

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Here is the source code for org.opennaas.extensions.router.model.utils.OpticalSwitchTopologyLoader.java

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package org.opennaas.extensions.router.model.utils;

/*
 * #%L
 * OpenNaaS :: CIM Model
 * %%
 * Copyright (C) 2007 - 2014 Fundaci Privada i2CAT, Internet i Innovaci a Catalunya
 * %%
 * 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.
 * #L%
 */

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class OpticalSwitchTopologyLoader {

    Log logger = LogFactory.getLog(OpticalSwitchTopologyLoader.class);

    Hashtable<String, Node> portsHashTable = new Hashtable<String, Node>();
    List<String[]> connections = new ArrayList<String[]>();

    private final String DEFAULT_TOPOLOGY_FILEPATH = "/proteusTopology.xml";

    public OpticalSwitchTopologyLoader() throws IOException {
        InputStream is = getClass().getResourceAsStream(DEFAULT_TOPOLOGY_FILEPATH);
        load(is);
    }

    public OpticalSwitchTopologyLoader(String configFile) throws IOException {
        load(configFile);
    }

    public void load(String configFile) throws IOException {

        FileInputStream s = new FileInputStream(new File(configFile));
        load(s);
    }

    private void load(InputStream configFileContent) throws IOException {

        try {
            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            Document doc = docBuilder.parse(configFileContent);

            doc.getDocumentElement().normalize();

            // load ports
            NodeList listOfPorts = doc.getElementsByTagName("port");
            for (int s = 0; s < listOfPorts.getLength(); s++) {
                Node portNode = listOfPorts.item(s);
                if (portNode.getNodeType() == Node.ELEMENT_NODE) {
                    String portId = portNode.getAttributes().getNamedItem("id").getTextContent();
                    this.portsHashTable.put(portId, portNode);
                }
            }

            // load connections
            NodeList listOfConnections = doc.getElementsByTagName("connection");
            for (int s = 0; s < listOfConnections.getLength(); s++) {
                Node connectionNode = listOfConnections.item(s);
                if (connectionNode.getNodeType() == Node.ELEMENT_NODE) {
                    String srcPortId = connectionNode.getAttributes().getNamedItem("srcPort").getTextContent();
                    String dstPortId = connectionNode.getAttributes().getNamedItem("dstPort").getTextContent();
                    connections.add(new String[] { srcPortId, dstPortId });
                }
            }

        } catch (SAXException e) {
            throw new IOException("Error parsing card profiles file:", e);
        } catch (ParserConfigurationException e) {
            throw new IOException("Error parsing card profiles file:", e);
        }

    }

    public List<String[]> getConnections(String nodeName) {
        List<String[]> result = new ArrayList<String[]>();
        for (String[] connection : connections) {
            if (nodeName.equals(getPortNodeName(connection[0]))) {
                result.add(connection);
            }
        }
        return result;
    }

    public String getPortNodeName(String srcPortID) {
        return getPortNodeName(portsHashTable.get(srcPortID));
    }

    private String getPortNodeName(Node port) {
        if (port != null) {
            // port -> ports -> slot -> chassis -> node
            Node portNode = port.getParentNode().getParentNode().getParentNode().getParentNode();
            if (portNode.getNodeType() == Node.ELEMENT_NODE) {
                return portNode.getAttributes().getNamedItem("id").getTextContent();
            }
        }
        return "";
    }

    public int getPortChassis(String srcPortID) {
        // port -> ports -> slot -> chassis
        Node portChasis = portsHashTable.get(srcPortID).getParentNode().getParentNode().getParentNode();
        if (portChasis.getNodeType() == Node.ELEMENT_NODE) {
            return Integer.parseInt(portChasis.getAttributes().getNamedItem("number").getTextContent());
        }
        return -1;
    }

    public int getPortSlot(String srcPortID) {
        // port -> ports -> slot
        Node portSlot = portsHashTable.get(srcPortID).getParentNode().getParentNode();
        if (portSlot.getNodeType() == Node.ELEMENT_NODE) {
            return Integer.parseInt(portSlot.getAttributes().getNamedItem("number").getTextContent());
        }
        return -1;
    }

    public int getPortNumber(String srcPortID) {
        Node port = portsHashTable.get(srcPortID);
        if (port.getNodeType() == Node.ELEMENT_NODE) {
            return Integer.parseInt(port.getTextContent());
        }
        return -1;
    }

    public String convertStreamToString(InputStream is) throws IOException {
        /*
         * To convert the InputStream to String we use the Reader.read(char[] buffer) method. We iterate until the Reader return -1 which means
         * there's no more data to read. We use the StringWriter class to produce the string.
         */
        if (is != null) {
            Writer writer = new StringWriter();

            char[] buffer = new char[1024];
            try {
                Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                int n;
                while ((n = reader.read(buffer)) != -1) {
                    writer.write(buffer, 0, n);
                }
            } finally {
                is.close();
            }
            return writer.toString();
        } else {
            return "";
        }
    }

}