Created simple class for communicating with music daemon.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@142 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/robodj/src/java/robodj/util/ServerControl.java

@@ -0,0 +1,116 @@
+//
+// $Id: ServerControl.java,v 1.1 2001/06/05 16:42:17 mdb Exp $
+
+package robodj.util;
+
+import java.io.*;
+import java.net.*;
+import java.util.ArrayList;
+import java.util.StringTokenizer;
+
+import robodj.Log;
+
+/**
+ * A simple class used to remotely control the music server through its
+ * network interface.
+ */
+public class ServerControl
+{
+    public ServerControl (String host, int port)
+        throws IOException
+    {
+        // create our server connection
+        _conn = new Socket(host, port);
+        // create our IO objects
+        _in = new BufferedReader(new InputStreamReader(
+            _conn.getInputStream()));
+        _out = new PrintWriter(_conn.getOutputStream());
+    }
+
+    public void pause ()
+    {
+        sendCommand("PAUSE");
+    }
+
+    public void play ()
+    {
+        sendCommand("PLAY");
+    }
+
+    public void stop ()
+    {
+        sendCommand("STOP");
+    }
+
+    public void clear ()
+    {
+        sendCommand("CLEAR");
+    }
+
+    public void skip ()
+    {
+        sendCommand("SKIP");
+    }
+
+    public void append (String trackPath)
+    {
+        sendCommand("APPEND " + trackPath);
+    }
+
+    public String[] getPlaylist ()
+    {
+        String result = sendCommand("PLAYLIST");
+        ArrayList songs = new ArrayList();
+        // parse the result string and then read the proper number of
+        // playlist entries from the output
+        if (!result.startsWith("200")) {
+            return null;
+        }
+
+        // the result looks like this:
+        // 200 Playlist songs: 9 current: /export/.../02.mp3
+        StringTokenizer tok = new StringTokenizer(result);
+        // skip the first three tokens to get to the actual count
+        tok.nextToken(); tok.nextToken(); tok.nextToken();
+        int count = 0;
+
+        try {
+            count = Integer.parseInt(tok.nextToken());
+            for (int i = 0; i < count; i++) {
+                songs.add(_in.readLine());
+            }
+
+        } catch (IOException ioe) {
+            Log.warning("Error communicating with music server: " + ioe);
+            return null;
+
+        } catch (NumberFormatException nfe) {
+            Log.warning("Bogus response from music server: " + result);
+            return null;
+        }
+
+        String[] plist = new String[count];
+        songs.toArray(plist);
+        return plist;
+    }
+
+    protected String sendCommand (String command)
+    {
+        try {
+            Log.info("Sending: " + command);
+            _out.println(command);
+            _out.flush();
+            String rsp = _in.readLine();
+            Log.info("Read response: " + rsp);
+            return rsp;
+
+        } catch (IOException ioe) {
+            Log.warning("Error communicating with server: " + ioe);
+            return null;
+        }
+    }
+
+    protected Socket _conn;
+    protected PrintWriter _out;
+    protected BufferedReader _in;
+}