extension/muc: light code formatting and refactoring.

app/src/main/java/com/xabber/android/data/extension/muc/Occupant.java

@@ -91,8 +91,9 @@ public class Occupant implements Comparable<Occupant> {
     @Override
     public int compareTo(Occupant another) {
         int result = another.role.ordinal() - role.ordinal();
-        if (result != 0)
+        if (result != 0) {
             return result;
+        }
         return nickname.compareTo(another.nickname);
     }
 

app/src/main/java/com/xabber/android/data/extension/muc/RoomAuthorizationError.java

@@ -22,8 +22,7 @@ import com.xabber.android.data.entity.BaseEntity;
 import com.xabber.android.data.notification.EntityNotificationItem;
 import com.xabber.android.ui.ConferenceAdd;
 
-public class RoomAuthorizationError extends BaseEntity implements
-        EntityNotificationItem {
+public class RoomAuthorizationError extends BaseEntity implements EntityNotificationItem {
 
     public RoomAuthorizationError(String account, String user) {
         super(account, user);
@@ -31,8 +30,7 @@ public class RoomAuthorizationError extends BaseEntity implements
 
     @Override
     public Intent getIntent() {
-        return ConferenceAdd.createIntent(Application.getInstance(),
-                account, user);
+        return ConferenceAdd.createIntent(Application.getInstance(), account, user);
     }
 
     @Override
@@ -42,8 +40,7 @@ public class RoomAuthorizationError extends BaseEntity implements
 
     @Override
     public String getText() {
-        return Application.getInstance().getString(
-                R.string.AUTHENTICATION_FAILED);
+        return Application.getInstance().getString(R.string.AUTHENTICATION_FAILED);
     }
 
 }

app/src/main/java/com/xabber/android/data/extension/muc/RoomInvite.java

@@ -46,8 +46,7 @@ public class RoomInvite extends BaseEntity implements EntityNotificationItem {
      */
     private final String password;
 
-    public RoomInvite(String account, String user, String inviter,
-                      String reason, String password) {
+    public RoomInvite(String account, String user, String inviter, String reason, String password) {
         super(account, user);
         this.inviter = inviter;
         this.reason = reason == null ? "" : reason;
@@ -73,19 +72,18 @@ public class RoomInvite extends BaseEntity implements EntityNotificationItem {
      * @return Text for the confirmation.
      */
     public String getConfirmation() {
-        String accountName = AccountManager.getInstance().getVerboseName(
-                account);
-        String inviterName = RosterManager.getInstance().getName(account,
-                inviter);
-        if (reason == null || "".equals(reason))
+        String accountName = AccountManager.getInstance().getVerboseName(account);
+        String inviterName = RosterManager.getInstance().getName(account, inviter);
+        if (reason == null || "".equals(reason)) {
             return Application.getInstance()
                     .getString(R.string.muc_invite_confirm, accountName,
                             inviterName, user);
-        else
+        } else {
             return Application.getInstance().getString(
                     R.string.muc_invite_confirm_reason, accountName,
                     inviterName, user, reason);
         }
+    }
 
     public String getInviter() {
         return inviter;

app/src/main/java/com/xabber/android/data/extension/muc/RoomState.java

@@ -62,29 +62,40 @@ public enum RoomState {
      * @return Status mode used in contact list.
      */
     StatusMode toStatusMode() {
-        if (this == RoomState.available)
+        switch (this) {
+            case available:
                 return StatusMode.available;
-        else if (this == RoomState.occupation)
+            case occupation:
+            case joining:
+            case creating:
+            case waiting:
                 return StatusMode.connection;
-        else if (this == RoomState.joining)
-            return StatusMode.connection;
-        else if (this == RoomState.creating)
-            return StatusMode.connection;
-        else if (this == RoomState.unavailable)
+            case unavailable:
                 return StatusMode.unavailable;
-        else if (this == RoomState.waiting)
-            return StatusMode.connection;
-        else if (this == RoomState.error)
+            case error:
                 return StatusMode.unsubscribed;
-        else
+            default:
                 throw new IllegalStateException();
         }
+    }
 
     /**
      * @return Connected is establish or connection is in progress.
      */
     boolean inUse() {
-        return this == RoomState.available || this == RoomState.occupation
-                || this == RoomState.creating || this == RoomState.joining;
+        switch (this) {
+
+            case available:
+            case occupation:
+            case joining:
+            case creating:
+                return true;
+
+            case unavailable:
+            case waiting:
+            case error:
+            default:
+                return false;
+        }
     }
 }

app/src/main/java/com/xabber/android/data/extension/muc/RoomTable.java

@@ -56,9 +56,8 @@ class RoomTable extends AbstractAccountTable {
     }
 
     private static final String NAME = "rooms";
-    private static final String[] PROJECTION = new String[]{Fields._ID,
-            Fields.ACCOUNT, Fields.ROOM, Fields.NICKNAME, Fields.PASSWORD,
-            Fields.NEED_JOIN,};
+    private static final String[] PROJECTION = new String[]{ Fields._ID,
+            Fields.ACCOUNT, Fields.ROOM, Fields.NICKNAME, Fields.PASSWORD, Fields.NEED_JOIN };
 
     private final DatabaseManager databaseManager;
     private SQLiteStatement writeStatement;
@@ -123,20 +122,12 @@ class RoomTable extends AbstractAccountTable {
 
     /**
      * Adds or updates room.
-     *
-     * @param account
-     * @param room
-     * @param nickname
-     * @param password
-     * @param join
      */
-    void write(String account, String room, String nickname, String password,
-               boolean join) {
+    void write(String account, String room, String nickname, String password, boolean join) {
         synchronized (writeLock) {
             if (writeStatement == null) {
                 SQLiteDatabase db = databaseManager.getWritableDatabase();
-                writeStatement = db
-                        .compileStatement("INSERT OR REPLACE INTO " + NAME
+                writeStatement = db.compileStatement("INSERT OR REPLACE INTO " + NAME
                                 + " (" + Fields.ACCOUNT + ", " + Fields.ROOM
                                 + ", " + Fields.NICKNAME + ", "
                                 + Fields.PASSWORD + ", " + Fields.NEED_JOIN
@@ -153,14 +144,10 @@ class RoomTable extends AbstractAccountTable {
 
     /**
      * Removes room.
-     *
-     * @param account
-     * @param room
      */
     void remove(String account, String room) {
         SQLiteDatabase db = databaseManager.getWritableDatabase();
-        db.delete(NAME, Fields.ACCOUNT + " = ? AND " + Fields.ROOM + " = ?",
-                new String[]{account, room});
+        db.delete(NAME, Fields.ACCOUNT + " = ? AND " + Fields.ROOM + " = ?", new String[]{account, room});
     }
 
     @Override