Add MethodValidator

See gh-29825

spring-context/src/main/java/org/springframework/validation/beanvalidation/DefaultMethodValidator.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2002-2023 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.springframework.validation.beanvalidation;
+
+import java.lang.reflect.Method;
+
+import org.springframework.lang.Nullable;
+
+/**
+ * Default implementation of {@link MethodValidator} that delegates to a
+ * {@link MethodValidationAdapter}. Also, convenient as a base class that allows
+ * handling of the validation result.
+ *
+ * @author Rossen Stoyanchev
+ * @since 6.1
+ */
+public class DefaultMethodValidator implements MethodValidator {
+
+	private final MethodValidationAdapter adapter;
+
+
+	public DefaultMethodValidator(MethodValidationAdapter adapter) {
+		this.adapter = adapter;
+	}
+
+
+	@Override
+	public Class<?>[] determineValidationGroups(Object bean, Method method) {
+		return MethodValidationAdapter.determineValidationGroups(bean, method);
+	}
+
+	@Override
+	public void validateArguments(Object target, Method method, Object[] arguments, Class<?>[] groups) {
+		MethodValidationResult result = this.adapter.validateMethodArguments(target, method, arguments, groups);
+		handleArgumentsResult(target, method, arguments, groups, result);
+	}
+
+	/**
+	 * Subclasses can override this to handle the result of argument validation.
+	 * By default, {@link MethodValidationResult#throwIfViolationsPresent()} is called.
+	 */
+	protected void handleArgumentsResult(
+			Object bean, Method method, Object[] arguments, Class<?>[] groups, MethodValidationResult result) {
+
+		result.throwIfViolationsPresent();
+	}
+
+	public void validateReturnValue(Object target, Method method, @Nullable Object returnValue, Class<?>[] groups) {
+		MethodValidationResult result = this.adapter.validateMethodReturnValue(target, method, returnValue, groups);
+		handleReturnValueResult(target, method, returnValue, groups, result);
+	}
+
+	/**
+	 * Subclasses can override this to handle the result of return value validation.
+	 * By default, {@link MethodValidationResult#throwIfViolationsPresent()} is called.
+	 */
+	protected void handleReturnValueResult(
+			Object bean, Method method, @Nullable Object returnValue, Class<?>[] groups, MethodValidationResult result) {
+
+		result.throwIfViolationsPresent();
+	}
+
+}

spring-context/src/main/java/org/springframework/validation/beanvalidation/MethodValidator.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2002-2023 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.springframework.validation.beanvalidation;
+
+import java.lang.reflect.Method;
+
+import org.springframework.lang.Nullable;
+
+/**
+ * Contract to apply method validation without directly using
+ * {@link MethodValidationAdapter}. For use in components where Jakarta Bean
+ * Validation is an optional dependency and may or may not be present on the
+ * classpath. If that's not a concern, use {@code MethodValidationAdapter}
+ * directly.
+ *
+ * @author Rossen Stoyanchev
+ * @since 6.1
+ * @see DefaultMethodValidator
+ */
+public interface MethodValidator {
+
+	/**
+	 * Use this method determine the validation groups to pass into
+	 * {@link #validateArguments(Object, Method, Object[], Class[])} and
+	 * {@link #validateReturnValue(Object, Method, Object, Class[])}.
+	 * @param target the target Object
+	 * @param method the target method
+	 * @return the applicable validation groups as a {@code Class} array
+	 * @see MethodValidationAdapter#determineValidationGroups(Object, Method)
+	 */
+	Class<?>[] determineValidationGroups(Object target, Method method);
+
+	/**
+	 * Validate the given method arguments and return the result of validation.
+	 * @param target the target Object
+	 * @param method the target method
+	 * @param arguments candidate arguments for a method invocation
+	 * @param groups groups for validation determined via
+	 * {@link #determineValidationGroups(Object, Method)}
+	 * @throws MethodValidationException should be raised in case of validation
+	 * errors unless the implementation handles those errors otherwise (e.g.
+	 * by injecting {@code BindingResult} into the method).
+	 */
+	void validateArguments(Object target, Method method, Object[] arguments, Class<?>[] groups);
+
+	/**
+	 * Validate the given return value and return the result of validation.
+	 * @param target the target Object
+	 * @param method the target method
+	 * @param returnValue value returned from invoking the target method
+	 * @param groups groups for validation determined via
+	 * {@link #determineValidationGroups(Object, Method)}
+	 * @throws MethodValidationException in case of validation errors
+	 */
+	void validateReturnValue(Object target, Method method, @Nullable Object returnValue, Class<?>[] groups);
+
+}