Reactive support for @ModelAttribute argument

Issue: SPR-14542

spring-web/src/main/java/org/springframework/web/bind/WebExchangeBindException.java

@@ -0,0 +1,288 @@
+/*
+ * Copyright 2002-2016 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.web.bind;
+
+import java.beans.PropertyEditor;
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.beans.PropertyEditorRegistry;
+import org.springframework.core.MethodParameter;
+import org.springframework.validation.BeanPropertyBindingResult;
+import org.springframework.validation.BindingResult;
+import org.springframework.validation.Errors;
+import org.springframework.validation.FieldError;
+import org.springframework.validation.ObjectError;
+import org.springframework.web.server.ServerWebInputException;
+
+/**
+ * A specialization of {@link ServerWebInputException} thrown when after data
+ * binding and validation failure. Implements {@link BindingResult} (and its
+ * super-interface {@link Errors}) to allow for direct analysis of binding and
+ * validation errors.
+ *
+ * @author Rossen Stoyanchev
+ * @since 5.0
+ */
+@SuppressWarnings("serial")
+public class WebExchangeBindException extends ServerWebInputException implements BindingResult {
+
+	private final BindingResult bindingResult;
+
+
+	public WebExchangeBindException(MethodParameter parameter, BindingResult bindingResult) {
+		super("Validation failure", parameter);
+		this.bindingResult = bindingResult;
+	}
+
+
+	/**
+	 * Return the BindingResult that this BindException wraps.
+	 * Will typically be a BeanPropertyBindingResult.
+	 * @see BeanPropertyBindingResult
+	 */
+	public final BindingResult getBindingResult() {
+		return this.bindingResult;
+	}
+
+
+	@Override
+	public String getObjectName() {
+		return this.bindingResult.getObjectName();
+	}
+
+	@Override
+	public void setNestedPath(String nestedPath) {
+		this.bindingResult.setNestedPath(nestedPath);
+	}
+
+	@Override
+	public String getNestedPath() {
+		return this.bindingResult.getNestedPath();
+	}
+
+	@Override
+	public void pushNestedPath(String subPath) {
+		this.bindingResult.pushNestedPath(subPath);
+	}
+
+	@Override
+	public void popNestedPath() throws IllegalStateException {
+		this.bindingResult.popNestedPath();
+	}
+
+
+	@Override
+	public void reject(String errorCode) {
+		this.bindingResult.reject(errorCode);
+	}
+
+	@Override
+	public void reject(String errorCode, String defaultMessage) {
+		this.bindingResult.reject(errorCode, defaultMessage);
+	}
+
+	@Override
+	public void reject(String errorCode, Object[] errorArgs, String defaultMessage) {
+		this.bindingResult.reject(errorCode, errorArgs, defaultMessage);
+	}
+
+	@Override
+	public void rejectValue(String field, String errorCode) {
+		this.bindingResult.rejectValue(field, errorCode);
+	}
+
+	@Override
+	public void rejectValue(String field, String errorCode, String defaultMessage) {
+		this.bindingResult.rejectValue(field, errorCode, defaultMessage);
+	}
+
+	@Override
+	public void rejectValue(String field, String errorCode, Object[] errorArgs, String defaultMessage) {
+		this.bindingResult.rejectValue(field, errorCode, errorArgs, defaultMessage);
+	}
+
+	@Override
+	public void addAllErrors(Errors errors) {
+		this.bindingResult.addAllErrors(errors);
+	}
+
+
+	@Override
+	public boolean hasErrors() {
+		return this.bindingResult.hasErrors();
+	}
+
+	@Override
+	public int getErrorCount() {
+		return this.bindingResult.getErrorCount();
+	}
+
+	@Override
+	public List<ObjectError> getAllErrors() {
+		return this.bindingResult.getAllErrors();
+	}
+
+	@Override
+	public boolean hasGlobalErrors() {
+		return this.bindingResult.hasGlobalErrors();
+	}
+
+	@Override
+	public int getGlobalErrorCount() {
+		return this.bindingResult.getGlobalErrorCount();
+	}
+
+	@Override
+	public List<ObjectError> getGlobalErrors() {
+		return this.bindingResult.getGlobalErrors();
+	}
+
+	@Override
+	public ObjectError getGlobalError() {
+		return this.bindingResult.getGlobalError();
+	}
+
+	@Override
+	public boolean hasFieldErrors() {
+		return this.bindingResult.hasFieldErrors();
+	}
+
+	@Override
+	public int getFieldErrorCount() {
+		return this.bindingResult.getFieldErrorCount();
+	}
+
+	@Override
+	public List<FieldError> getFieldErrors() {
+		return this.bindingResult.getFieldErrors();
+	}
+
+	@Override
+	public FieldError getFieldError() {
+		return this.bindingResult.getFieldError();
+	}
+
+	@Override
+	public boolean hasFieldErrors(String field) {
+		return this.bindingResult.hasFieldErrors(field);
+	}
+
+	@Override
+	public int getFieldErrorCount(String field) {
+		return this.bindingResult.getFieldErrorCount(field);
+	}
+
+	@Override
+	public List<FieldError> getFieldErrors(String field) {
+		return this.bindingResult.getFieldErrors(field);
+	}
+
+	@Override
+	public FieldError getFieldError(String field) {
+		return this.bindingResult.getFieldError(field);
+	}
+
+	@Override
+	public Object getFieldValue(String field) {
+		return this.bindingResult.getFieldValue(field);
+	}
+
+	@Override
+	public Class<?> getFieldType(String field) {
+		return this.bindingResult.getFieldType(field);
+	}
+
+	@Override
+	public Object getTarget() {
+		return this.bindingResult.getTarget();
+	}
+
+	@Override
+	public Map<String, Object> getModel() {
+		return this.bindingResult.getModel();
+	}
+
+	@Override
+	public Object getRawFieldValue(String field) {
+		return this.bindingResult.getRawFieldValue(field);
+	}
+
+	@Override
+	@SuppressWarnings("rawtypes")
+	public PropertyEditor findEditor(String field, Class valueType) {
+		return this.bindingResult.findEditor(field, valueType);
+	}
+
+	@Override
+	public PropertyEditorRegistry getPropertyEditorRegistry() {
+		return this.bindingResult.getPropertyEditorRegistry();
+	}
+
+	@Override
+	public void addError(ObjectError error) {
+		this.bindingResult.addError(error);
+	}
+
+	@Override
+	public String[] resolveMessageCodes(String errorCode) {
+		return this.bindingResult.resolveMessageCodes(errorCode);
+	}
+
+	@Override
+	public String[] resolveMessageCodes(String errorCode, String field) {
+		return this.bindingResult.resolveMessageCodes(errorCode, field);
+	}
+
+	@Override
+	public void recordSuppressedField(String field) {
+		this.bindingResult.recordSuppressedField(field);
+	}
+
+	@Override
+	public String[] getSuppressedFields() {
+		return this.bindingResult.getSuppressedFields();
+	}
+
+
+	/**
+	 * Returns diagnostic information about the errors held in this object.
+	 */
+	@Override
+	@SuppressWarnings("OptionalGetWithoutIsPresent")
+	public String getMessage() {
+		MethodParameter parameter = getMethodParameter().get();
+		StringBuilder sb = new StringBuilder("Validation failed for argument at index ")
+				.append(parameter.getParameterIndex()).append(" in method: ")
+				.append(parameter.getMethod().toGenericString())
+				.append(", with ").append(this.bindingResult.getErrorCount()).append(" error(s): ");
+		for (ObjectError error : this.bindingResult.getAllErrors()) {
+			sb.append("[").append(error).append("] ");
+		}
+		return sb.toString();
+	}
+
+	@Override
+	public boolean equals(Object other) {
+		return (this == other || this.bindingResult.equals(other));
+	}
+
+	@Override
+	public int hashCode() {
+		return this.bindingResult.hashCode();
+	}
+
+}