PayloadTypeProcessor.java

package com.github.aesteve.vertx.nubes.handlers.impl;

import com.github.aesteve.vertx.nubes.handlers.Processor;
import com.github.aesteve.vertx.nubes.marshallers.Payload;
import com.github.aesteve.vertx.nubes.marshallers.PayloadMarshaller;
import io.vertx.core.http.HttpServerResponse;
import io.vertx.ext.web.RoutingContext;

import java.util.Map;

public class PayloadTypeProcessor implements Processor {

  private final Map<String, PayloadMarshaller> marshallers;

  public PayloadTypeProcessor(Map<String, PayloadMarshaller> marshallers) {
    this.marshallers = marshallers;
  }

  @Override
  public void preHandle(RoutingContext context) {
    Payload<?> payload = new Payload<>();
    context.put(Payload.DATA_ATTR, payload);
    context.next();
  }

  @Override
  public void afterAll(RoutingContext context) {
    Payload<?> payload = context.get(Payload.DATA_ATTR);
    HttpServerResponse response = context.response();
    if (response.ended()) {
      return;
    }
    Object userPayload = payload.get();
    if (userPayload == null) {
      response.setStatusCode(204);
      response.end();
    } else {
      String contentType = ContentTypeProcessor.getContentType(context);
      if (contentType == null) {
        context.fail(new IllegalArgumentException("No content-type defined, cannot marshall payload"));
        return;
      }
      PayloadMarshaller marshaller = marshallers.get(contentType);
      if (marshaller == null) {
        context.fail(new IllegalArgumentException("No marshaller found for content-type : " + contentType));
        return;
      }
      String marshalled = marshaller.marshallPayload(userPayload);
      response.setStatusCode(200);
      response.end(marshalled);
    }
  }

  @Override
  public void postHandle(RoutingContext context) {
    context.next();
  }

}