Define a map template method for no value

Author: jeffgbutler

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

@@ -34,7 +34,21 @@ protected <S extends AbstractNoValueCondition<?>> S filterSupport(BooleanSupplie
 
     public abstract String operator();
 
-    @Override
+    /**
+     * If renderable and the supplier returns true, returns this condition. Else returns a condition that will not
+     * render.
+     *
+     * @param booleanSupplier
+     *            function that specifies whether the condition should render
+     * @param <S>
+     *            condition type - not used except for compilation compliance
+     *
+     * @return this condition if renderable and the supplier returns true, otherwise a condition that will not render.
+     */
+    public abstract <S> AbstractNoValueCondition<S> filter(BooleanSupplier booleanSupplier);
+
+
+        @Override
     public FragmentAndParameters renderCondition(RenderingContext renderingContext, BindableColumn<T> leftColumn) {
         return FragmentAndParameters.fromFragment(operator());
     }

src/main/java/org/mybatis/dynamic/sql/where/condition/IsNotNull.java

@@ -42,17 +42,7 @@ public String operator() {
         return "is not null"; //$NON-NLS-1$
     }
 
-    /**
-     * If renderable and the supplier returns true, returns this condition. Else returns a condition that will not
-     * render.
-     *
-     * @param booleanSupplier
-     *            function that specifies whether the condition should render
-     * @param <S>
-     *            condition type - not used except for compilation compliance
-     *
-     * @return this condition if renderable and the supplier returns true, otherwise a condition that will not render.
-     */
+    @Override
     public <S> IsNotNull<S> filter(BooleanSupplier booleanSupplier) {
         @SuppressWarnings("unchecked")
         IsNotNull<S> self = (IsNotNull<S>) this;

src/main/java/org/mybatis/dynamic/sql/where/condition/IsNull.java

@@ -42,17 +42,7 @@ public String operator() {
         return "is null"; //$NON-NLS-1$
     }
 
-    /**
-     * If renderable and the supplier returns true, returns this condition. Else returns a condition that will not
-     * render.
-     *
-     * @param booleanSupplier
-     *            function that specifies whether the condition should render
-     * @param <S>
-     *            condition type - not used except for compilation compliance
-     *
-     * @return this condition if renderable and the supplier returns true, otherwise a condition that will not render.
-     */
+    @Override
     public <S> IsNull<S> filter(BooleanSupplier booleanSupplier) {
         @SuppressWarnings("unchecked")
         IsNull<S> self = (IsNull<S>) this;

src/test/java/examples/mysql/MemberOfCondition.java

@@ -16,12 +16,26 @@
 package examples.mysql;
 
 import java.util.Objects;
+import java.util.function.BooleanSupplier;
 
 import org.jspecify.annotations.NullMarked;
 import org.mybatis.dynamic.sql.AbstractNoValueCondition;
 
 @NullMarked
 public class MemberOfCondition<T> extends AbstractNoValueCondition<T> {
+    private static final MemberOfCondition<?> EMPTY = new MemberOfCondition<>("") {
+        @Override
+        public boolean isEmpty() {
+            return true;
+        }
+    };
+
+    public static <T> MemberOfCondition<T> empty() {
+        @SuppressWarnings("unchecked")
+        MemberOfCondition<T> t = (MemberOfCondition<T>) EMPTY;
+        return t;
+    }
+
     private final String jsonArray;
 
     protected MemberOfCondition(String jsonArray) {
@@ -33,6 +47,13 @@ public String operator() {
         return "member of(" + jsonArray + ")";
     }
 
+    @Override
+    public <S> MemberOfCondition<S> filter(BooleanSupplier booleanSupplier) {
+        @SuppressWarnings("unchecked")
+        MemberOfCondition<S> self = (MemberOfCondition<S>) this;
+        return filterSupport(booleanSupplier, MemberOfCondition::empty, self);
+    }
+
     public static <T> MemberOfCondition<T> memberOf(String jsonArray) {
         return new MemberOfCondition<>(jsonArray);
     }