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JSON API framework for Java

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package io.crnk.rs.internal.legacy;

import java.lang.reflect.Method;
import javax.ws.rs.CookieParam;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.QueryParam;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.core.Cookie;
import javax.ws.rs.core.SecurityContext;

import com.fasterxml.jackson.databind.ObjectMapper;
import io.crnk.core.utils.Optional;
import io.crnk.legacy.internal.RepositoryMethodParameterProvider;
import io.crnk.rs.internal.legacy.provider.Parameter;
import io.crnk.rs.internal.legacy.provider.RequestContextParameterProvider;

/**
 * 
 * An implementation of legacy provider for JAX-RS integration based on a registry of RequestContextParameterProvider
 * provided by an instance of RequestContextParameterProviderRegistry.
 * By default, the registry supports the following parameters:
 * 
 * 
 * {@link ContainerRequestContext}
 * {@link SecurityContext}
 * Values annotated with {@link CookieParam}
 * Values annotated with {@link HeaderParam}
 * Values annotated with {@link QueryParam}
 * 
 * 
 * Value casting for values annotated with {@link CookieParam} and {@link HeaderParam} does not conform with the
 * definitions described in the JAX-RS specification. If a value is not String or {@link Cookie} for
 * {@link CookieParam}, an instance of {@link ObjectMapper} is used to map the value to the desired type.
 * 
 */
public class JaxrsParameterProvider implements RepositoryMethodParameterProvider {

	private final ObjectMapper objectMapper;
	private final ContainerRequestContext requestContext;
	private final RequestContextParameterProviderRegistry parameterProviderRegistry;

	public JaxrsParameterProvider(ObjectMapper objectMapper, ContainerRequestContext requestContext, RequestContextParameterProviderRegistry parameterProviderRegistry) {
		this.objectMapper = objectMapper;
		this.requestContext = requestContext;
		this.parameterProviderRegistry = parameterProviderRegistry;
	}

	@Override
	public  T provide(Method method, int parameterIndex) {
		Parameter parameter = new Parameter(method, parameterIndex);
		Optional provider = parameterProviderRegistry.findProviderFor(parameter);
		return provider.isPresent() ? (T) provider.get().provideValue(parameter, requestContext, objectMapper) : null;
	}
}