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JSON API framework for Java

There is a newer version: 2.6.20180430102904

package io.crnk.rs.internal.legacy.provider;

import java.io.IOException;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.container.ContainerRequestContext;

import com.fasterxml.jackson.databind.ObjectMapper;

public class HeaderParamProvider implements RequestContextParameterProvider {

	@Override
	public Object provideValue(Parameter parameter, ContainerRequestContext requestContext, ObjectMapper objectMapper) {
		Object returnValue;
		String value = requestContext.getHeaderString(parameter.getAnnotation(HeaderParam.class).value());
		if (value == null) {
			return null;
		}
		else {
			if (String.class.isAssignableFrom(parameter.getType())) {
				returnValue = value;
			}
			else {
				try {
					returnValue = objectMapper.readValue(value, parameter.getType());
				}
				catch (IOException e) {
					throw new IllegalStateException(e);
				}
			}
		}

		return returnValue;
	}

	@Override
	public boolean provides(Parameter parameter) {
		return parameter.isAnnotationPresent(HeaderParam.class);
	}
}