How to use the information of a parsed xml file (java)?

Question

I have parsed a XML file using a DOM parser in Java but I require tips on how to actually use this information.

I have to create a method that takes the information parsed and sends out commands, based on certain information extracted from the file, to a software that I use at work, by using a socket.

The software I use maps communications. For example: since Federate Jurassic and Federate WWS communicate, one of the string commands would be used to map it.

I need assistance in beginning to write this method. Thanks.

This is my Java code so far:

public class Parse {

    public static void main(String args[]) throws IOException, InterruptedException {
        Socket s = null;
        try {
            s = new Socket("localhost", 8008);
            System.out.println(s.isConnected());

            File Configuration = new File("Configuration.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(Configuration);
            doc.getDocumentElement().normalize();

            System.out.println("root of xml file " + doc.getDocumentElement().getNodeName());
            NodeList nodes = doc.getElementsByTagName("Federate");
            NodeList n = doc.getElementsByTagName("Interface");

            System.out.println("Federate names:");

            for (int i = 0; i < nodes.getLength(); i++) {
                Node node = nodes.item(i);
                System.out.println(node.getAttributes().getNamedItem("name"));
            }
            System.out.println("");
            System.out.println("Interface names:");

            for (int i = 0; i < n.getLength(); i++) {
                Node a = n.item(i);
                System.out.println(a.getAttributes().getNamedItem("name"));
                System.out.println(a.getAttributes().getNamedItem("publish"));
                System.out.println(a.getAttributes().getNamedItem("subscribe"));
                System.out.println("");
            }

        } catch (Exception ex) {
            ex.printStackTrace();
        }
        String command1 = "{\"Command\":\"AddVertex\",\"Params\":{\"Attr\":{\"UniqueID\":\"Fed1\"},\"Show\":\"True\"}}";
        String command2 = "{\"Command\":\"AddVertex\",\"Params\":{\"Attr\":{\"UniqueID\":\"Fed2\"},\"Show\":\"True\"}}";
        String command3 = "{\"Command\":\"AddEdge\",\"Params\":{\"Attr\":{\"UniqueID\":\"30\"},\"Show\":\"True\",\"To\":\"Fed1\",\"From\":\"Fed2\"}}";
        String command4 = "{\"Command\":\"ChangePreferences\",\"Params\":{\"Name\":\"Edge Colors\",\"Settings\":{\"Transformations\":{\"UniqueID\":{\"Method\":\"Enumerated\",\"Mapping\":[{\"Input\":\"30\",\"Output\":\"Green\"}]}},\"BasedOn\":\"UniqueID\"}}}";
        String command5 = "{\"Command\":\"ReleaseEvents\"}";
        String command6 = "{\"Command\":\"AddVertex\",\"Params\":{\"Attr\":{\"UniqueID\":\"Fed3\"},\"Show\":\"True\"}}";
        String command7 = "{\"Command\":\"AddVertex\",\"Params\":{\"Attr\":{\"UniqueID\":\"Fed4\"},\"Show\":\"True\"}}";
        String command8 = "{\"Command\":\"AddEdge\",\"Params\":{\"Attr\":{\"UniqueID\":\"30\"},\"Show\":\"True\",\"To\":\"Fed3\",\"From\":\"Fed2\"}}";
        String command9 = "{\"Command\":\"AddEdge\",\"Params\":{\"Attr\":{\"UniqueID\":\"30\"},\"Show\":\"True\",\"To\":\"Fed4\",\"From\":\"Fed2\"}}";
        String command10 = "{\"Command\":\"AddEdge\",\"Params\":{\"Attr\":{\"UniqueID\":\"30\"},\"Show\":\"True\",\"To\":\"Fed4\",\"From\":\"Fed3\"}}";

        PrintWriter out = null;

        out = new PrintWriter(s.getOutputStream(), true);
        BufferedReader in = null;
        in = new BufferedReader(new InputStreamReader(s.getInputStream()));

        ...
    }
}

XML File:

<?xml version="1.0" encoding="UTF-8"?>
<FederationConfiguration>
    <Controller port="18909"/>
    <ControllerTimeout value="1" units="ms"/>

    <Federation name="JurassicWws">    
        <Federate name="WWS">  
            <StartupShutdownTimeout value="10" units="s"/>
            <Interface name="Jurassic" instanceNumber="1" publish="false" subscribe="true"/> 
        </Federate>

        <Federate name="Jurassic">  
            <StartupShutdownTimeout value="10" units="s"/>
            <Interface name="Jurassic" instanceNumber="1" publish="true" subscribe="false"/> 
            <Interface name="Baz" instanceNumber="1" publish="true" subscribe="false"/>
        </Federate>

        <Federate name="FOO">
            <StartupShutdownTimeout value="10" units="s"/>
            <Interface name="Baz" instanceNumber="1" publish="false" subscribe="true"/>
            <Interface name="Delta" instanceNumber="1" publish="true" subscribe="true"/>
        </Federate>

        <Federate name="BAR"> 
            <StartupShutdownTimeout value="10" units="s"/>
            <Interface name="Baz" instanceNumber="1" publish="false" subscribe="true"/> 
            <Interface name="Delta" instanceNumber="1" publish="true" subscribe="true"/>
        </Federate>
    </Federation>
</FederationConfiguration>

Answer 1

you need to have a structure for your code, use simple OOP...

your xml parser

Class MyXmlParser{

public ArrayList<Commands> parse(String xmlFileName){
} 

public ArrayList<Commands> parse(String xmlString){
} 
}

and a command class

Class Command {
private String command = "";
private String options = "";
:
:
//setters 

//getters

}

command sender class..

Class CommandSender{
private Socket socket = null;

public CommandSender(String IP, int Port){
//init socket here ...
}

public boolean sendCommand(Command cmd){
//send command and return true/false...
}

public void close(){
//close the socket...
}
}

finally ur main class

Class AppStarter{
public Static Void Main(String args[]){
MyXmlParser xmlParser = new MyXmlParser();
ArrayList<Commands> cmds = xmlParser.parse(args[0]);
CommandSender cmdSender = new CommandSender("192.168.1.110",8081);

for(a=0;....cmds.size...){
cmdSender.sendCommand(cmds.get(a));
}//for loop

}//main()

}