ApiErrorCreator.java

package am.ik.categolj2.api.error;

import org.springframework.context.MessageSource;
import org.springframework.context.support.DefaultMessageSourceResolvable;
import org.springframework.stereotype.Component;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.ObjectError;
import org.springframework.web.context.request.WebRequest;
import org.terasoluna.gfw.common.message.ResultMessage;
import org.terasoluna.gfw.common.message.ResultMessages;

import javax.inject.Inject;

@Component
public class ApiErrorCreator {

    @Inject
    MessageSource messageSource;

    public ApiError createApiError(WebRequest request, String errorCode,
                                   String defaultErrorMessage, Object... arguments) {
        String localizedMessage = messageSource.getMessage(errorCode,
                arguments, defaultErrorMessage, request.getLocale());
        return new ApiError(errorCode, localizedMessage);
    }

    public ApiError createBindingResultApiError(WebRequest request,
                                                String errorCode, BindingResult bindingResult,
                                                String defaultErrorMessage) {
        ApiError apiError = createApiError(request, errorCode,
                defaultErrorMessage);
        for (FieldError fieldError : bindingResult.getFieldErrors()) {
            apiError.addDetail(createApiError(request, fieldError, fieldError
                    .getField()));
        }
        for (ObjectError objectError : bindingResult.getGlobalErrors()) {
            apiError.addDetail(createApiError(request, objectError, objectError
                    .getObjectName()));
        }
        return apiError;
    }

    private ApiError createApiError(WebRequest request,
                                    DefaultMessageSourceResolvable messageResolvable, String target) {
        String localizedMessage = messageSource.getMessage(messageResolvable,
                request.getLocale());
        return new ApiError(messageResolvable.getCode(), localizedMessage, target);
    }

    public ApiError createResultMessagesApiError(WebRequest request,
                                                 String rootErrorCode, ResultMessages resultMessages,
                                                 String defaultErrorMessage) {
        ApiError apiError;
        if (resultMessages.getList().size() == 1) {
            ResultMessage resultMessage = resultMessages.iterator().next();
            String errorCode = resultMessage.getCode();
            if (errorCode == null) {
                errorCode = rootErrorCode;
            }
            apiError = createApiError(request, errorCode, resultMessage
                    .getText(), resultMessage.getArgs());
        } else {
            apiError = createApiError(request, rootErrorCode,
                    defaultErrorMessage);
            for (ResultMessage resultMessage : resultMessages.getList()) {
                apiError.addDetail(createApiError(request, resultMessage
                        .getCode(), resultMessage.getText(), resultMessage
                        .getArgs()));
            }
        }
        return apiError;
    }

}