Adds Advanced server type

The advanced server type allows vanilla, snapshot and sponge have
necessary methods and variables while keeping the others clean.

src/Main.java

@@ -27,7 +27,7 @@ public class Main {
 		//This could be changed to read from a list which is downloaded to the user's computer.
 		serverTypes.add(new ServerType("Vanilla", new String[]{"Latest", "1.12", "1.11.2", "1.10.2", "1.9.4", "1.8.9", "1.7.10", "1.6.4", "1.5.2", "1.4.7", "1.3.2", "1.2.5"}));
 		serverTypes.add(new ServerType("Snapshot", new String[]{"Latest"}));
-		serverTypes.add(new ServerType("SpongeVanilla", new String[]{"1.11.2", "1.10.2", "1.8.9"}));
+		serverTypes.add(new AdvancedServerType("SpongeVanilla", new String[]{"1.11.2", "1.10.2", "1.8.9"}, "https://dl-api.spongepowered.org/v1/org.spongepowered/spongevanilla/downloads?type=stable&minecraft=", "\"version\":\"", "\",", "https://repo.spongepowered.org/maven/org/spongepowered/spongevanilla/", "/spongevanilla-"));
 		serverTypes.add(new ServerType("Spigot", new String[]{"1.12", "1.11.2", "1.10.2", "1.9.4", "1.9", "1.8.8", "1.7.10", "1.6.4", "1.5.2", "1.4.7"}));
 		serverTypes.add(new ServerType("MCPCplus", new String[]{"1.6.4", "1.6.2", "1.5.2", "1.4.7"}));
 		serverTypes.add(new ServerType("Craftbukkit", new String[]{"1.12", "1.11.2", "1.10.2", "1.9.4", "1.8.8", "1.7.10", "1.6.4", "1.5.2", "1.4.6", "1.3.2", "1.2.5", "1.1", "1.0"}));

src/net/knarcraft/serverlauncher/server/AdvancedServerType.java

@@ -0,0 +1,38 @@
+package net.knarcraft.serverlauncher.server;
+
+public class AdvancedServerType extends ServerType {
+    private String versionURL;
+    private String downloadURL;
+    private String downloadURLPart;
+    private String srcStart;
+    private String srcEnd;
+
+    public AdvancedServerType(String name, String[] versions, String versionURL, String srcStart, String srcEnd, String downloadURL, String downloadURLPart) {
+        super(name, versions);
+        this.srcStart = srcStart;
+        this.srcEnd = srcEnd;
+        this.versionURL = versionURL;
+        this.downloadURL = downloadURL;
+        this.downloadURLPart = downloadURLPart;
+    }
+
+    public String getVersionURL() {
+        return this.versionURL;
+    }
+
+    public String getDownloadURL() {
+        return this.downloadURL;
+    }
+
+    public String getDownloadURLPart() {
+        return this.downloadURLPart;
+    }
+
+    public String getSrcStart() {
+        return this.srcStart;
+    }
+
+    public String getSrcEnd() {
+        return this.srcEnd;
+    }
+}

src/net/knarcraft/serverlauncher/server/Server.java

@@ -11,16 +11,16 @@ import java.util.ArrayList;
 import java.io.FileNotFoundException;
 /* Contains all necessary information to create, run and manage a Minecraft server. */
 public class Server {
-	private final String BASEURL = "https://knarcraft.net/Api/Download/bungeeminecraftserverlauncher/jars"; //The url we download jar files from.
+	private static final String BASEURL = "https://knarcraft.net/Api/Download/bungeeminecraftserverlauncher/jars"; //The url we download jar files from.
-	private final String BUKKITURL = BASEURL + "/Bukkit/";
+	private static final String BUKKITURL = BASEURL + "/Bukkit/";
-	private final String MCPCURL = BASEURL + "/MCPC+/";
+	private static final String MCPCURL = BASEURL + "/MCPC+/";
-	private final String SPIGOT = BASEURL + "/Spigot/";
+	private static final String SPIGOTURL = BASEURL + "/Spigot/";
 	private static String[] ramList = {"512M", "1G", "2G", "3G", "4G", "5G", "6G", "7G", "8G", "9G", "10G", "11G", "12G", "13G", "14G", "15G", "16G"};
 	private String name;
 	private String path;
 	private boolean enabled;
 	private ArrayList<String> playerList;
-	private ServerType type;
+	private AdvancedServerType type;
 	private String serverVersion;
 	private String maxRam;
 	private long pid;
@@ -76,12 +76,41 @@ public class Server {
      * Custom files must exist, or trigger a message.
      */
 	public void downloadJar() throws FileNotFoundException {
-        if (!new File(this.path + "\\" + this.type.getName() + this.serverVersion).isFile()) {
+        if (!new File(this.path + "\\" + this.getType()).isFile()) {
-            //TODO: Download a jar file based on version and type. Return true if the file was downloaded and ready to run.
+            switch (this.type.getName()) {
-            throw new FileNotFoundException("");
+                case "Custom":
+                    throw new FileNotFoundException("Specified custom jar was not found.");
+                case "Spigot":
+                    staticJar(SPIGOTURL);
+                    break;
+                case "Craftbukkit":
+                    staticJar(BUKKITURL);
+                    break;
+                case "MCPCplus":
+                    staticJar(MCPCURL);
+                    break;
+                case "Vanilla":
+                    if (this.serverVersion.equals("Latest")) {
+
+                    } else {
+
+                    }
+                    break;
+                case "Sponge":
+                    staticJar(type.getVersionURL(), type.getSrcStart(), type.getSrcEnd(), type.getDownloadURL(), type.getDownloadURLPart(), this.getType());
+            }
+            //TODO: Download a jar file based on version and type. Throw an error if the file could not be found or fetched.
         }
     }
 
+    private boolean staticJar(String url) {
+        return downloadFile(url + this.getType(), Paths.get(this.path + this.getType()));
+    }
+
+    private boolean staticJar(String versionURL, String srcStart, String srcEnd, String downloadURL, String downloadURLPart, String outfile) {
+        return downloadFile(versionURL + this.getType(), Paths.get(this.path + this.getType()));
+    }
+
 	/**
 	 * Reads the first line of a file from a website.
 	 * This is used to find the newest version of the software.
@@ -110,7 +139,7 @@ public class Server {
 	 * @param outfile	The file to save to.
 	 * @return			True if successful. False otherwise.
 	 */
-	public static boolean downloadFile(String path, Path outfile) {
+	private static boolean downloadFile(String path, Path outfile) {
 		try {
 			URL url = new URL("https://knarcraft.net/Api/View/Jawns/Jawns%20instructions.txt");
 			InputStream in = url.openStream();
@@ -121,4 +150,8 @@ public class Server {
 			return false;
 		}
 	}
+
+	private String stringBetween(String string, String start, String end) {
+        return string.substring(string.indexOf(start) + 1 + start.length(), string.indexOf(end));
+    }
 }

src/net/knarcraft/serverlauncher/server/ServerType.java

@@ -1,5 +1,6 @@
 package net.knarcraft.serverlauncher.server;
 
+import java.net.MalformedURLException;
 import java.net.URL;
 
 /**
@@ -8,10 +9,6 @@ import java.net.URL;
 public class ServerType {
 	private String name;
 	private String[] versions;
-	private URL versionURL;
-	private URL downloadURL;
-	private String srcStart;
-	private String srcEnd;
 	
 	public ServerType(String name, String[] versions) {
 		this.name = name;