#850 Add setting specifying which password hashes should be checked

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

@@ -0,0 +1,43 @@
+package fr.xephi.authme.settings;
+
+import com.github.authme.configme.properties.Property;
+import com.github.authme.configme.resource.PropertyResource;
+
+import java.util.List;
+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>> {
+
+    private final Class<E> enumClass;
+
+    public EnumSetProperty(Class<E> enumClass, String path, List<E> defaultValue) {
+        super(path, defaultValue);
+        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;
+    }
+
+    private E toEnum(String str) {
+        for (E e : enumClass.getEnumConstants()) {
+            if (str.equalsIgnoreCase(e.name())) {
+                return e;
+            }
+        }
+        return null;
+    }
+}