Fix some more stupid if statements (and one stupid switch!)

Change-Id: I730c5ff1a917dde84994870d6495c473609a62b4
Reviewed-on: http://gerrit.dmdirc.com/341
Reviewed-by: Gregory Holmes <greboid@dmdirc.com>
Tested-by: Gregory Holmes <greboid@dmdirc.com>

src/com/dmdirc/addons/parser_twitter/Twitter.java

     /** {@inheritDoc} */
     @Override
     public boolean isUserSettable(final char mode) {
-        switch (mode) {
-            case 'b':
-                return true;
-            default:
-                return false;
-        }
+        return mode == 'b';
     }
 
     /** {@inheritDoc} */

src/com/dmdirc/addons/ui_swing/components/addonbrowser/AddonFilter.java

             Entry<? extends DefaultTableModel, ? extends Integer> entry) {
         AddonInfo info = ((AddonInfoLabel) entry.getModel().getValueAt(entry.
                 getIdentifier(), 0)).getAddonInfo();
-        if ((!verifiedBox.isSelected() && info.isVerified()) ||
+        return !((!verifiedBox.isSelected() && info.isVerified()) ||
                 (!unverifiedBox.isSelected() && !info.isVerified()) ||
                 (!installedBox.isSelected() && info.isInstalled()) ||
                 (!notinstalledBox.isSelected() &&
                 AddonType.TYPE_THEME) ||
                 (!actionsBox.isSelected() && info.getType() ==
                 AddonType.TYPE_ACTION_PACK) || (!searchBox.getText().
-                isEmpty() && !info.matches(searchBox.getText()))) {
-            return false;
-        }
-        return true;
+                isEmpty() && !info.matches(searchBox.getText())));
     }
 }

src/com/dmdirc/addons/ui_swing/components/reorderablelist/ArrayListTransferHandler.java

     /** {@inheritDoc} */
     @Override
     public boolean canImport(final JComponent comp, final DataFlavor[] transferFlavors) {
-        if (!(comp instanceof JList) || !(((JList) comp).getModel() instanceof DefaultListModel)) {
-            return false;
-        }
-
-        if (hasLocalArrayListFlavor(transferFlavors)) {
-            return true;
-        }
-
-        if (hasSerialArrayListFlavor(transferFlavors)) {
-            return true;
-        }
-
-        return false;
+        return comp instanceof JList && ((JList) comp).getModel() instanceof DefaultListModel
+                && (hasLocalArrayListFlavor(transferFlavors)
+                || hasSerialArrayListFlavor(transferFlavors));
     }
 
     /** {@inheritDoc} */

src/com/dmdirc/addons/ui_swing/components/reorderablelist/ArrayListTransferable.java

     /** {@inheritDoc} */
     @Override
     public boolean isDataFlavorSupported(final DataFlavor flavor) {
-        if (localArrayListFlavor.equals(flavor)) {
-            return true;
-        }
-        
-        if (serialArrayListFlavor.equals(flavor)) {
-            return true;
-        }
-        
-        return false;
+        return localArrayListFlavor.equals(flavor)
+                || serialArrayListFlavor.equals(flavor);
     }
 }

src/com/dmdirc/addons/ui_swing/dialogs/actioneditor/StringTransferable.java

     /** {@inheritDoc} */
     @Override
     public boolean isDataFlavorSupported(final DataFlavor flavor) {
-        if (localStringFlavor.equals(flavor)) {
-            return true;
-        }
-
-        if (serialStringFlavor.equals(flavor)) {
-            return true;
-        }
-
-        return false;
+        return localStringFlavor.equals(flavor) || serialStringFlavor.equals(flavor);
     }
 
     /**