Rename VisitableCondition to RenderableCondition

Conditions are no longer rendered via a Visitor, so the new name makes more sense

Author: jeffgbutler

src/main/java/org/mybatis/dynamic/sql/RenderableCondition.java

@@ -0,0 +1,56 @@
+/*
+ *    Copyright 2016-2025 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+package org.mybatis.dynamic.sql;
+
+import org.mybatis.dynamic.sql.render.RenderingContext;
+import org.mybatis.dynamic.sql.util.FragmentAndParameters;
+
+@FunctionalInterface
+public interface RenderableCondition<T> {
+    FragmentAndParameters renderCondition(RenderingContext renderingContext, BindableColumn<T> leftColumn);
+
+    default FragmentAndParameters renderLeftColumn(RenderingContext renderingContext, BindableColumn<T> leftColumn) {
+        return leftColumn.alias()
+                .map(FragmentAndParameters::fromFragment)
+                .orElseGet(() -> leftColumn.render(renderingContext));
+    }
+
+    /**
+     * Subclasses can override this to inform the renderer if the condition should not be included
+     * in the rendered SQL.  Typically, conditions will not render if they are empty.
+     *
+     * @return true if the condition should render.
+     */
+    default boolean shouldRender(RenderingContext renderingContext) {
+        return !isEmpty();
+    }
+
+    /**
+     * Subclasses can override this to indicate whether the condition is considered empty. This is primarily used in
+     * map and filter operations - the map and filter functions will not be applied if the condition is empty.
+     *
+     * @return true if the condition is empty.
+     */
+    default boolean isEmpty() {
+        return false;
+    }
+
+    /**
+     * This method will be called during rendering when {@link RenderableCondition#shouldRender(RenderingContext)}
+     * returns false.
+     */
+    default void renderingSkipped() {}
+}