ConstraintViolationExceptionMapper.java

package com.devicehive.resource.exceptions;

/*
 * #%L
 * DeviceHive Java Server Common business logic
 * %%
 * Copyright (C) 2016 DataArt
 * %%
 * 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.
 * #L%
 */


import com.devicehive.model.ErrorResponse;
import com.devicehive.resource.util.ResponseFactory;

import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;

import java.util.Set;

import static javax.ws.rs.core.Response.Status.BAD_REQUEST;

@Provider
public class ConstraintViolationExceptionMapper implements ExceptionMapper<ConstraintViolationException> {

    @Override
    public Response toResponse(ConstraintViolationException exception) {
        Set<ConstraintViolation<?>> constraintViolations = exception.getConstraintViolations();
        StringBuilder errors = new StringBuilder();
        constraintViolations.forEach(exc -> errors.append(exc.getMessage()));
        return ResponseFactory.response(BAD_REQUEST,
                new ErrorResponse(BAD_REQUEST.getStatusCode(), errors.toString()));
    }
}