#850 Fix export of legacy hashes property

- Ugly workaround due to #1014: need to have EnumSetProperty extend from StringListProperty type so that it is exported in a proper manner (as a string list). To get an enum Set we need to call a dedicated method on EnumSetProperty for the time being.

src/main/java/fr/xephi/authme/settings/EnumSetProperty.java

@@ -1,35 +1,38 @@
 package fr.xephi.authme.settings;
 
-import com.github.authme.configme.properties.Property;
-import com.github.authme.configme.resource.PropertyResource;
+import com.github.authme.configme.SettingsManager;
+import com.github.authme.configme.properties.StringListProperty;
 
 import java.util.List;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 /**
  * Property whose value is a set of entries of a given enum.
  */
-// TODO https://github.com/AuthMe/ConfigMe/issues/27: Should be a Property of Set<E> type
-public class EnumSetProperty<E extends Enum<E>> extends Property<List<E>> {
+// TODO #1014: This property type currently extends StringListProperty with a dedicated method  to convert the values
+// into a Set of the selected enum due to multiple issues on ConfigMe's side.
+public class EnumSetProperty<E extends Enum<E>> extends StringListProperty {
 
     private final Class<E> enumClass;
 
-    public EnumSetProperty(Class<E> enumClass, String path, List<E> defaultValue) {
-        super(path, defaultValue);
+    public EnumSetProperty(Class<E> enumClass, String path, String... values) {
+        super(path, values);
         this.enumClass = enumClass;
     }
 
-    @Override
-    protected List<E> getFromResource(PropertyResource resource) {
-        List<?> elements = resource.getList(getPath());
-        if (elements != null) {
-            return elements.stream()
-                .map(val -> toEnum(String.valueOf(val)))
-                .filter(e -> e != null)
-                .distinct()
-                .collect(Collectors.toList());
-        }
-        return null;
+    /**
+     * Returns the value as a set of enum entries.
+     *
+     * @param settings the settings manager to look up the raw value with
+     * @return the property's value as mapped enum entries
+     */
+    public Set<E> asEnumSet(SettingsManager settings) {
+        List<String> entries = settings.getProperty(this);
+        return entries.stream()
+            .map(str -> toEnum(str))
+            .filter(e -> e != null)
+            .collect(Collectors.toSet());
     }
 
     private E toEnum(String str) {