--- a/flys-client/src/main/java/de/intevation/flys/client/shared/model/ThemeList.java	Wed May 25 16:23:16 2011 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/shared/model/ThemeList.java	Thu May 26 13:53:36 2011 +0000
@@ -63,5 +63,38 @@
             themes.add(theme);
         }
     }
+
+
+    /**
+     * Modifies the order of themes in this list and the position of the
+     * <i>theme</i> itself.
+     *
+     * @param theme The theme which position has to be modified.
+     * @param newPos The new position.
+     */
+    public void setThemePosition(Theme theme, int newPos) {
+        int count  = getThemeCount();
+        int oldPos = theme.getPosition();
+
+        if (newPos == oldPos || newPos > count || newPos < 1) {
+            return;
+        }
+
+        boolean moveUp = newPos < oldPos;
+
+        for (Theme aTheme: themes) {
+            int tmpPos = aTheme.getPosition();
+
+            if (theme.equals(aTheme)) {
+                theme.setPosition(newPos);
+            }
+            else if (tmpPos >= newPos && tmpPos < oldPos && moveUp) {
+                aTheme.setPosition(tmpPos+1);
+            }
+            else if (tmpPos <= newPos && tmpPos > oldPos && !moveUp) {
+                aTheme.setPosition(tmpPos-1);
+            }
+        }
+    }
 }
 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :