#1539 Add support for columns that are not on player auth (is_logged, has_session)

src/main/java/fr/xephi/authme/datasource/columnshandler/PlayerAuthColumn.java

@@ -0,0 +1,32 @@
+package fr.xephi.authme.datasource.columnshandler;
+
+import ch.jalu.configme.properties.Property;
+import ch.jalu.datasourcecolumns.ColumnType;
+import ch.jalu.datasourcecolumns.DependentColumn;
+import fr.xephi.authme.data.auth.PlayerAuth;
+
+import java.util.function.Function;
+
+/**
+ * Implementation for columns which can also be retrieved from a {@link PlayerAuth} object.
+ *
+ * @param <T> column type
+ */
+public class PlayerAuthColumn<T> extends DataSourceColumn<T> implements DependentColumn<T, ColumnContext, PlayerAuth> {
+
+    private final Function<PlayerAuth, T> playerAuthGetter;
+
+    /*
+     * Constructor. See parent class for details.
+     */
+    PlayerAuthColumn(ColumnType<T> type, Property<String> nameProperty, boolean isOptional, boolean useDefaultForNull,
+                     Function<PlayerAuth, T> playerAuthGetter) {
+        super(type, nameProperty, isOptional, useDefaultForNull);
+        this.playerAuthGetter = playerAuthGetter;
+    }
+
+    @Override
+    public T getValueFromDependent(PlayerAuth auth) {
+        return playerAuthGetter.apply(auth);
+    }
+}