/*
 * Copyright 2002-2017 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.server;

import org.springframework.core.MethodParameter;
import org.springframework.http.HttpStatus;
import org.springframework.lang.Nullable;

Exception for errors that fit response status 400 (bad request) for use in Spring Web applications. The exception provides additional fields (e.g. an optional MethodParameter if related to the error). 
Author:
Rossen Stoyanchev
Since:
5.0/**
 * Exception for errors that fit response status 400 (bad request) for use in
 * Spring Web applications. The exception provides additional fields (e.g.
 * an optional {@link MethodParameter} if related to the error).
 *
 * @author Rossen Stoyanchev
 * @since 5.0
 */
@SuppressWarnings("serial")
public class ServerWebInputException extends ResponseStatusException {

	@Nullable
	private final MethodParameter parameter;


	
Constructor with an explanation only.
/**
	 * Constructor with an explanation only.
	 */
	public ServerWebInputException(String reason) {
		this(reason, null, null);
	}

	
Constructor for a 400 error linked to a specific MethodParameter. /**
	 * Constructor for a 400 error linked to a specific {@code MethodParameter}.
	 */
	public ServerWebInputException(String reason, @Nullable MethodParameter parameter) {
		this(reason, parameter, null);
	}

	
Constructor for a 400 error with a root cause.
/**
	 * Constructor for a 400 error with a root cause.
	 */
	public ServerWebInputException(String reason, @Nullable MethodParameter parameter, @Nullable Throwable cause) {
		super(HttpStatus.BAD_REQUEST, reason, cause);
		this.parameter = parameter;
	}


	
Return the MethodParameter associated with this error, if any. /**
	 * Return the {@code MethodParameter} associated with this error, if any.
	 */
	@Nullable
	public MethodParameter getMethodParameter() {
		return this.parameter;
	}

}