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Stomp support for Vert.x 3

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/*
 *  Copyright (c) 2011-2015 The original author or authors
 *  ------------------------------------------------------
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  and Apache License v2.0 which accompanies this distribution.
 *
 *       The Eclipse Public License is available at
 *       http://www.eclipse.org/legal/epl-v10.html
 *
 *       The Apache License v2.0 is available at
 *       http://www.opensource.org/licenses/apache2.0.php
 *
 *  You may elect to redistribute this code under either of these licenses.
 */

package io.vertx.ext.stomp;

import io.vertx.core.Handler;
import io.vertx.ext.stomp.utils.Headers;

import java.util.List;

/**
 * STOMP compliant actions executed when receiving a {@code UNSUBSCRIBE} frame.
 * 
 * This handler is thread safe.
 *
 * @author Clement Escoffier
 */
public class DefaultUnsubscribeHandler implements Handler {
  @Override
  public void handle(ServerFrame serverFrame) {
    Frame frame = serverFrame.frame();
    StompServerConnection connection = serverFrame.connection();
    final String id = frame.getHeader(Frame.ID);

    if (id == null) {
      connection.write(
          Frames.createErrorFrame(
              "Invalid unsubscribe",
              Headers.create(frame.getHeaders()),
              "The 'id' header must be set"));
      connection.close();
      return;
    }

    List destinations = connection.handler().getDestinations();
    boolean handled = false;
    for (Destination destination : destinations) {
      if (destination.unsubscribe(connection, frame)) {
        handled = true;
        break;
      }
    }

    if (!handled) {
      connection.write(Frames.createErrorFrame(
          "Invalid unsubscribe",
          Headers.create(frame.getHeaders()),
          "No subscription associated with the given 'id'"));
      connection.close();
      return;
    }

    Frames.handleReceipt(frame, connection);
  }
}