com.github.tcurrie.rest.factory.RestParameterAdaptor Maven / Gradle / Ivy

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Simple rest client-server factory, you give it a url, it does the rest!

There is a newer version: 0.2.70

package com.github.tcurrie.rest.factory;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.github.tcurrie.rest.factory.v1.RestFactoryException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Method;
import java.util.function.Function;

public interface RestParameterAdaptor {
    interface Client extends Function {
        final class Factory {
            private Factory() {
                throw new RestFactoryException("Can not construct instance of Factory class.");
            }

            private static final Logger LOGGER = LoggerFactory.getLogger(Factory.class);
            private static final ObjectMapper MAPPER = new ObjectMapper();
            public static Client create(final Method method) {
                return p -> {
                    try {
                        final String s = MAPPER.writeValueAsString(p);
                        LOGGER.debug("Mapped [{}] to [{}].", p, s);
                        return s;
                    } catch (final JsonProcessingException e) {
                        LOGGER.warn("Failed to map [{}] for method [{}].", p, method, e);
                        throw new RestFactoryException(Strings.format("Failed to map [{}] for method [{}].", p, method), e);
                    }
                };
            }
        }
    }

    interface Service extends Function {
        final class Factory {
            private Factory() {
                throw new RestFactoryException("Can not construct instance of Factory class.");
            }

            private static final Logger LOGGER = LoggerFactory.getLogger(Factory.class);
            private static final Service NO_ARGUMENT_ADAPTOR = r -> new Object[0];

            public static Service create(final Method method) {
                if (method.getParameterCount() == 0) {
                    return NO_ARGUMENT_ADAPTOR;
                } else {
                    final JsonAdaptor parser = JsonAdaptor.Factory.create(method);
                    return r -> {
                        LOGGER.debug("Parsing [{}] for method [{}]");
                        return parser.apply(r);
                    };
                }
            }
        }
    }

}