Add getChannelPrefixes method

Issue 2819

Change-Id: I80a6a36a1a19ccf41f3847bfbb1641c73d3a5bf2
Reviewed-on: http://gerrit.dmdirc.com/531
Automatic-Compile: Gregory Holmes <greboid@dmdirc.com>
Reviewed-by: Gregory Holmes <greboid@dmdirc.com>

src/com/dmdirc/parser/interfaces/Parser.java

@@ -290,6 +290,14 @@ public interface Parser extends Runnable {
      * @return A string containing a list of channel user mode characters
      */
     String getChannelUserModes();
+
+    /**
+     * Retrieves a list of channel prefixes.
+     *
+     * @return A list of known channel prefixes
+     * @since 0.6.3
+     */
+    String getChannelPrefixes();
     
     /**
      * Retrieves the object which is responsible for managing callbacks for

src/com/dmdirc/parser/irc/IRCParser.java

@@ -1264,7 +1264,7 @@ public class IRCParser implements SecureParser, Runnable {
     }
 
     /** {@inheritDoc} */
-        @Override
+    @Override
     public String getChannelUserModes() {
         if (h005Info.containsKey("PREFIXSTRING")) {
             return h005Info.get("PREFIXSTRING");
@@ -1274,7 +1274,7 @@ public class IRCParser implements SecureParser, Runnable {
     }
 
     /** {@inheritDoc} */
-        @Override
+    @Override
     public String getBooleanChannelModes() {
         final char[] modes = new char[chanModesBool.size()];
         int i = 0;
@@ -1287,23 +1287,39 @@ public class IRCParser implements SecureParser, Runnable {
     }
 
     /** {@inheritDoc} */
-        @Override
+    @Override
     public String getListChannelModes() {
         return getOtherModeString(MODE_LIST);
     }
 
     /** {@inheritDoc} */
-        @Override
+    @Override
     public String getParameterChannelModes() {
         return getOtherModeString(MODE_SET);
     }
 
     /** {@inheritDoc} */
-        @Override
+    @Override
     public String getDoubleParameterChannelModes() {
         return getOtherModeString((byte) (MODE_SET + MODE_UNSET));
     }
 
+    /** {@inheritDoc} */
+    @Override
+    public String getChannelPrefixes() {
+        if (chanPrefix.isEmpty()) {
+            return "#&";
+        }
+        
+        final StringBuilder builder = new StringBuilder(chanPrefix.size());
+
+        for (Character prefix : chanPrefix) {
+            builder.append(prefix);
+        }
+
+        return builder.toString();
+    }
+
     /**
      * Get modes from hChanModesOther that have a specific value.
      * Modes are returned in alphabetical order