es.sandbox.ui.messages.spring.config.FlashMessagesMethodArgumentResolver Maven / Gradle / Ivy

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package es.sandbox.ui.messages.spring.config;

import es.sandbox.ui.messages.Context;
import es.sandbox.ui.messages.Flash;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import javax.servlet.http.HttpServletRequest;


public class FlashMessagesMethodArgumentResolver
    implements HandlerMethodArgumentResolver {

    private static final Logger LOGGER = LoggerFactory.getLogger(FlashMessagesMethodArgumentResolver.class);

    private final Context context;


    /**
     * @param context
     */
    public FlashMessagesMethodArgumentResolver(Context context) {
        if (context == null) {
            throw new NullPointerException("Context can't be null");
        }
        this.context = context;
    }

    /*
     * (non-Javadoc)
     * @see
     * org.springframework.web.method.support.HandlerMethodArgumentResolver#supportsParameter(org.springframework.core
     * .MethodParameter)
     */
    @Override
    public boolean supportsParameter(MethodParameter parameter) { // NO_UCD (test only)
        return Flash.class.isAssignableFrom(parameter.getParameterType());
    }

    /*
     * (non-Javadoc)
     * @see
     * org.springframework.web.method.support.HandlerMethodArgumentResolver#resolveArgument(org.springframework.core
     * .MethodParameter, org.springframework.web.method.support.ModelAndViewContainer,
     * org.springframework.web.context.request.NativeWebRequest,
     * org.springframework.web.bind.support.WebDataBinderFactory)
     */
    @Override
    public Object resolveArgument( // NO_UCD (test only)
                                   MethodParameter parameter,
                                   ModelAndViewContainer mavContainer,
                                   NativeWebRequest webRequest,
                                   WebDataBinderFactory binderFactory) {

        LOGGER.trace("Accesing to the messages publisher from the request: {}", webRequest);
        return this.context.publisher(nativeRequest(webRequest));
    }

    private HttpServletRequest nativeRequest(NativeWebRequest webRequest) {
        return (HttpServletRequest) webRequest.getNativeRequest();
    }
}