Improved backwards compatible rTorrent adapter, which can switch to the right methods (currently for adding torrents) based on the version.

app/src/main/java/org/transdroid/daemon/Rtorrent/RtorrentAdapter.java

@@ -82,6 +82,7 @@ public class RtorrentAdapter implements IDaemonAdapter {
 	private DaemonSettings settings;
 	private XMLRPCClient rpcclient;
 	private List<Label> lastKnownLabels = null;
+	private Integer version = null;
 
 	public RtorrentAdapter(DaemonSettings settings) {
 		this.settings = settings;
@@ -91,6 +92,16 @@ public class RtorrentAdapter implements IDaemonAdapter {
 	public DaemonTaskResult executeTask(Log log, DaemonTask task) {
 
 		try {
+			// Ensure a version number is know to switch to the right methods
+			if (version == null) {
+				try {
+					Object versionObject = makeRtorrentCall(log, "system.client_version", new String[0]);
+					String[] versionRaw = versionObject.toString().split("\\.");
+					version = (Integer.parseInt(versionRaw[0]) * 10000) + (Integer.parseInt(versionRaw[1]) * 100) + Integer.parseInt(versionRaw[2]);
+				} catch (Exception e) {
+					version = 10000;
+				}
+			}
 			switch (task.getMethod()) {
 				case Retrieve:
 
@@ -167,22 +178,35 @@ public class RtorrentAdapter implements IDaemonAdapter {
 					byte[] bytes = baos.toByteArray();
 					int size = (int) file.length() * 2;
 					final int XMLRPC_EXTRA_PADDING = 1280;
+					if (version >= 904) {
 						makeRtorrentCall(log, "network.xmlrpc.size_limit.set", new Object[]{size + XMLRPC_EXTRA_PADDING});
 						makeRtorrentCall(log, "load.raw_start", new Object[]{bytes});
+					} else {
+						makeRtorrentCall(log, "set_xmlrpc_size_limit", new Object[]{size + XMLRPC_EXTRA_PADDING});
+						makeRtorrentCall(log, "load_raw_start", new Object[]{bytes});
+					}
 					return new DaemonTaskSuccessResult(task);
 
 				case AddByUrl:
 
 					// Request to add a torrent by URL
 					String url = ((AddByUrlTask) task).getUrl();
+					if (version >= 904) {
 						makeRtorrentCall(log, "load.start", new String[]{"", url});
+					} else {
+						makeRtorrentCall(log, "load_start", new String[]{url});
+					}
 					return new DaemonTaskSuccessResult(task);
 
 				case AddByMagnetUrl:
 
 					// Request to add a magnet link by URL
 					String magnet = ((AddByMagnetUrlTask) task).getUrl();
+					if (version >= 904) {
 						makeRtorrentCall(log, "load.start", new String[]{"", magnet});
+					} else {
+						makeRtorrentCall(log, "load_start", new String[]{magnet});
+					}
 					return new DaemonTaskSuccessResult(task);
 
 				case Remove: