Make field BeanValidationRandomizerRegistry#annotationHandlers protected

This change is required to be able to extend the default bean validation
registry with custom annotation handlers.

Issue j-easy#401

easy-random-bean-validation/src/main/java/org/jeasy/random/validation/BeanValidationRandomizerRegistry.java

@@ -44,7 +44,7 @@
 @Priority(-2)
 public class BeanValidationRandomizerRegistry implements RandomizerRegistry {
 
-    private Map<Class<? extends Annotation>, BeanValidationAnnotationHandler> annotationHandlers = new HashMap<>();
+    protected Map<Class<? extends Annotation>, BeanValidationAnnotationHandler> annotationHandlers = new HashMap<>();
 
     @Override
     public void init(EasyRandomParameters parameters) {

easy-random-bean-validation/src/test/java/org/jeasy/random/validation/BeanValidationTest.java

@@ -34,6 +34,7 @@
 import javax.validation.Validation;
 import javax.validation.Validator;
 import javax.validation.ValidatorFactory;
+import javax.validation.constraints.Digits;
 
 import org.jeasy.random.EasyRandom;
 import org.jeasy.random.EasyRandomParameters;
@@ -219,4 +220,24 @@ void generatedBeanShouldBeValidUsingBeanValidationAPI() {
         assertThat(violations).isEmpty();
     }
 
+    @Test
+    void customRegistryTest() {
+        // given
+        class Salary {
+            @Digits(integer = 2, fraction = 2) // OSS developer salary.. :-)
+            private BigDecimal amount;
+        }
+
+        EasyRandomParameters parameters = new EasyRandomParameters()
+                .randomizerRegistry(new MyCustomBeanValidationRandomizerRegistry());
+        EasyRandom easyRandom = new EasyRandom(parameters);
+
+        // when
+        Salary salary = easyRandom.nextObject(Salary.class);
+
+        // then
+        assertThat(salary).isNotNull();
+        assertThat(salary.amount).isLessThanOrEqualTo(new BigDecimal("99.99"));
+    }
+
 }

easy-random-bean-validation/src/test/java/org/jeasy/random/validation/MyCustomBeanValidationRandomizerRegistry.java

@@ -0,0 +1,37 @@
+/*
+ * The MIT License
+ *
+ *   Copyright (c) 2020, Mahmoud Ben Hassine ([email protected])
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ */
+package org.jeasy.random.validation;
+
+import javax.validation.constraints.Digits;
+
+import org.jeasy.random.EasyRandomParameters;
+
+public class MyCustomBeanValidationRandomizerRegistry extends BeanValidationRandomizerRegistry {
+
+	@Override
+	public void init(EasyRandomParameters parameters) {
+		super.init(parameters);
+		annotationHandlers.put(Digits.class, new MyCustomDigitsAnnotationHandler());
+	}
+}

easy-random-bean-validation/src/test/java/org/jeasy/random/validation/MyCustomDigitsAnnotationHandler.java

@@ -0,0 +1,40 @@
+/*
+ * The MIT License
+ *
+ *   Copyright (c) 2020, Mahmoud Ben Hassine ([email protected])
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ */
+package org.jeasy.random.validation;
+
+import java.lang.reflect.Field;
+
+import org.jeasy.random.api.Randomizer;
+import org.jeasy.random.randomizers.number.BigDecimalRandomizer;
+
+public class MyCustomDigitsAnnotationHandler implements BeanValidationAnnotationHandler {
+
+	@Override
+	public Randomizer<?> getRandomizer(Field field) {
+		// `@Digits` is applicable to several types (see its javadoc)
+		// for this test, just assuming the field is a BigDecimal
+		return new BigDecimalRandomizer(Integer.valueOf(2));
+	}
+
+}