DATAREST-805 - ValidationError nor exposes rejected value as is.

Previously ValidationError captured the toString() variant of the rejected value. We now return the rejected value as is.

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/support/RepositoryConstraintViolationExceptionMessage.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2014 the original author or authors.
+ * Copyright 2012-2016 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.
@@ -15,11 +15,14 @@
  */
 package org.springframework.data.rest.webmvc.support;
 
+import lombok.Value;
+
 import java.util.ArrayList;
 import java.util.List;
 
 import org.springframework.context.support.MessageSourceAccessor;
 import org.springframework.data.rest.core.RepositoryConstraintViolationException;
+import org.springframework.util.Assert;
 import org.springframework.validation.FieldError;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
@@ -32,15 +35,22 @@ public class RepositoryConstraintViolationExceptionMessage {
 
 	private final List<ValidationError> errors = new ArrayList<ValidationError>();
 
-	public RepositoryConstraintViolationExceptionMessage(RepositoryConstraintViolationException violationException,
+	/**
+	 * Creates a new {@link RepositoryConstraintViolationExceptionMessage} for the given
+	 * {@link RepositoryConstraintViolationException} and {@link MessageSourceAccessor}.
+	 * 
+	 * @param exception must not be {@literal null}.
+	 * @param accessor must not be {@literal null}.
+	 */
+	public RepositoryConstraintViolationExceptionMessage(RepositoryConstraintViolationException exception,
 			MessageSourceAccessor accessor) {
 
-		for (FieldError fieldError : violationException.getErrors().getFieldErrors()) {
+		Assert.notNull(exception, "RepositoryConstraintViolationException must not be null!");
+		Assert.notNull(accessor, "MessageSourceAccessor must not be null!");
 
-			String message = accessor.getMessage(fieldError);
-
-			this.errors.add(new ValidationError(fieldError.getObjectName(), message,
-					String.format("%s", fieldError.getRejectedValue()), fieldError.getField()));
+		for (FieldError fieldError : exception.getErrors().getFieldErrors()) {
+			this.errors.add(ValidationError.of(fieldError.getObjectName(), fieldError.getField(),
+					fieldError.getRejectedValue(), accessor.getMessage(fieldError)));
 		}
 	}
 
@@ -49,34 +59,10 @@ public class RepositoryConstraintViolationExceptionMessage {
 		return errors;
 	}
 
+	@Value(staticConstructor = "of")
 	public static class ValidationError {
-
-		private final String entity;
-		private final String message;
-		private final String invalidValue;
-		private final String property;
-
-		public ValidationError(String entity, String message, String invalidValue, String property) {
-			this.entity = entity;
-			this.message = message;
-			this.invalidValue = invalidValue;
-			this.property = property;
-		}
-
-		public String getEntity() {
-			return entity;
-		}
-
-		public String getMessage() {
-			return message;
-		}
-
-		public String getInvalidValue() {
-			return invalidValue;
-		}
-
-		public String getProperty() {
-			return property;
-		}
+		String entity, property;
+		Object invalidValue;
+		String message;
 	}
 }

spring-data-rest-webmvc/src/test/java/org/springframework/data/rest/webmvc/support/RepositoryConstraintViolationExceptionMessageUnitTests.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2016 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
+ *
+ *      http://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.data.rest.webmvc.support;
+
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.context.support.MessageSourceAccessor;
+import org.springframework.context.support.StaticMessageSource;
+import org.springframework.data.rest.core.RepositoryConstraintViolationException;
+import org.springframework.data.rest.webmvc.support.RepositoryConstraintViolationExceptionMessage.ValidationError;
+import org.springframework.validation.Errors;
+import org.springframework.validation.MapBindingResult;
+
+/**
+ * Unit tests for {@link RepositoryConstraintViolationExceptionMessage}
+ * 
+ * @author Oliver Gierke
+ */
+public class RepositoryConstraintViolationExceptionMessageUnitTests {
+
+	MessageSourceAccessor accessor;
+	RepositoryConstraintViolationException exception;
+
+	@Before
+	public void setUp() {
+
+		StaticMessageSource messageSource = new StaticMessageSource();
+		messageSource.addMessage("code", Locale.ENGLISH, "message");
+
+		this.accessor = new MessageSourceAccessor(messageSource, Locale.ENGLISH);
+		this.exception = new RepositoryConstraintViolationException(new MapBindingResult(Collections.emptyMap(), "object"));
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void rejectsNullException() {
+		new RepositoryConstraintViolationExceptionMessage(null, accessor);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void rejectsNullAccessor() {
+		new RepositoryConstraintViolationExceptionMessage(exception, null);
+	}
+
+	@Test
+	public void calidationErrorsCaptureRejectedValueAsIs() {
+
+		assertRejectedValue("stringValue", "string");
+		assertRejectedValue("intValue", 1);
+		assertRejectedValue("nullValue", null);
+	}
+
+	private void assertRejectedValue(String key, Object value) {
+
+		Map<String, Object> map = new HashMap<String, Object>();
+		map.put(key, value);
+
+		Errors errors = new MapBindingResult(map, "object");
+		errors.rejectValue(key, "code");
+
+		RepositoryConstraintViolationExceptionMessage message = new RepositoryConstraintViolationExceptionMessage(
+				new RepositoryConstraintViolationException(errors), accessor);
+
+		List<ValidationError> result = message.getErrors();
+
+		assertThat(result, hasSize(1));
+		assertThat(result.get(0).getInvalidValue(), is(value));
+	}
+}