feat(logical-operators): add Operator ISNULL for filtering on NULL va…

…lues

src/main/java/fr/ouestfrance/querydsl/FilterOperation.java

@@ -1,6 +1,7 @@
 package fr.ouestfrance.querydsl;
 
 import fr.ouestfrance.querydsl.service.validators.ValidatedBy;
+import fr.ouestfrance.querydsl.service.validators.impl.BooleanValidator;
 import fr.ouestfrance.querydsl.service.validators.impl.CollectionValidator;
 import fr.ouestfrance.querydsl.service.validators.impl.ComparableValidator;
 import fr.ouestfrance.querydsl.service.validators.impl.StringValidator;
@@ -72,4 +73,11 @@ class IN implements FilterOperation {
     @ValidatedBy(CollectionValidator.class)
     class NOTIN implements FilterOperation {
     }
+
+    /**
+     * Is null Operation
+     */
+    @ValidatedBy(BooleanValidator.class)
+    class ISNULL implements FilterOperation {
+    }
 }

src/main/java/fr/ouestfrance/querydsl/service/validators/impl/BooleanValidator.java

@@ -0,0 +1,20 @@
+package fr.ouestfrance.querydsl.service.validators.impl;
+
+import fr.ouestfrance.querydsl.service.validators.FilterFieldValidator;
+import lombok.NoArgsConstructor;
+
+/**
+ * Validator that handle filter on Boolean
+ */
+@NoArgsConstructor
+public class BooleanValidator implements FilterFieldValidator {
+    @Override
+    public boolean validate(Class<?> clazz) {
+        return Boolean.class.isAssignableFrom(clazz);
+    }
+
+    @Override
+    public String message() {
+        return "should be applied to Boolean";
+    }
+}

src/test/java/fr/ouestfrance/querydsl/service/validators/impl/BooleanValidatorTest.java

@@ -0,0 +1,37 @@
+package fr.ouestfrance.querydsl.service.validators.impl;
+
+import fr.ouestfrance.querydsl.service.validators.FilterFieldValidator;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.util.*;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class BooleanValidatorTest {
+
+    private final FilterFieldValidator validator = new BooleanValidator();
+    @Test
+    void shouldValidate(){
+        assertTrue(validator.validate(Boolean.class));
+    }
+
+    @Test
+    void shouldUnValidate(){
+        assertFalse(validator.validate(String.class));
+        assertFalse(validator.validate(Double.class));
+        assertFalse(validator.validate(LocalDate.class));
+        assertFalse(validator.validate(LocalDateTime.class));
+        assertFalse(validator.validate(Date.class));
+        assertFalse(validator.validate(UUID.class));
+        assertFalse(validator.validate(Integer.class));
+        assertFalse(validator.validate(BigDecimal.class));
+        assertFalse(validator.validate(Set.class));
+        assertFalse(validator.validate(ArrayList.class));
+        assertFalse(validator.validate(LinkedList.class));
+        assertFalse(validator.validate(HashSet.class));
+    }
+}

src/test/java/fr/ouestfrance/querydsl/service/validators/impl/ComprableValidatorTest.java → src/test/java/fr/ouestfrance/querydsl/service/validators/impl/ComparableValidatorTest.java

@@ -11,7 +11,7 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-class ComprableValidatorTest {
+class ComparableValidatorTest {
 
     private final FilterFieldValidator validator = new ComparableValidator();
     @Test