content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.camel.component.zookeeper;
  
  import java.util.List;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.component.zookeeper.operations.WatchedEventProvider;
  import org.apache.camel.component.zookeeper.operations.ZooKeeperOperation;
  import org.apache.camel.support.ExchangeHelper;
  import org.apache.zookeeper.CreateMode;
  import org.apache.zookeeper.WatchedEvent;
  import org.apache.zookeeper.ZooDefs.Ids;
  import org.apache.zookeeper.data.ACL;
  
  /**
   * <code>ZooKeeperUtils</code> contains static utility functions mostly for retrieving optional message properties from
   * Message headers.
   */
  public final class ZooKeeperUtils {
  
      private ZooKeeperUtils() {
      }
  
      /**
       * Pulls a createMode flag from the header keyed by {@link ZooKeeperMessage#ZOOKEEPER_CREATE_MODE} in the given
       * message and attempts to parse a {@link CreateMode} from it.
       *
       * @param  message the message that may contain a ZOOKEEPER_CREATE_MODE header.
       * @return         the parsed {@link CreateMode} or null if the header was null or not a valid mode flag.
       */
      public static CreateMode getCreateMode(Message message, CreateMode defaultMode) {
          CreateMode mode = null;
  
          try {
              mode = message.getHeader(ZooKeeperMessage.ZOOKEEPER_CREATE_MODE, CreateMode.class);
          } catch (Exception e) {
          }
  
          if (mode == null) {
              String modeHeader = message.getHeader(ZooKeeperMessage.ZOOKEEPER_CREATE_MODE, String.class);
              mode = getCreateModeFromString(modeHeader, defaultMode);
          }
          return mode == null ? defaultMode : mode;
      }
  
      public static CreateMode getCreateModeFromString(String modeHeader, CreateMode defaultMode) {
  
          CreateMode mode = null;
          if (modeHeader != null) {
              try {
                  mode = CreateMode.valueOf(modeHeader);
              } catch (Exception e) {
              }
          }
          return mode == null ? defaultMode : mode;
      }
  
      /**
       * Pulls the target node from the header keyed by {@link ZooKeeperMessage#ZOOKEEPER_NODE}. This node is then
       * typically used in place of the configured node extracted from the endpoint uri.
       *
       * @param  message the message that may contain a ZOOKEEPER_NODE header.
       * @return         the node property or null if the header was null
       */
      public static String getNodeFromMessage(Message message, String defaultNode) {
          return getZookeeperProperty(message, ZooKeeperMessage.ZOOKEEPER_NODE, defaultNode, String.class);
      }
  
      public static Integer getVersionFromMessage(Message message) {
          return getZookeeperProperty(message, ZooKeeperMessage.ZOOKEEPER_NODE_VERSION, -1, Integer.class);
      }
  
      public static byte[] getPayloadFromExchange(Exchange exchange) {
          return ExchangeHelper.convertToType(exchange, byte[].class, exchange.getIn().getBody());
      }
  
      @SuppressWarnings("unchecked")
      public static List<ACL> getAclListFromMessage(Message in) {
          return getZookeeperProperty(in, ZooKeeperMessage.ZOOKEEPER_ACL, Ids.OPEN_ACL_UNSAFE, List.class);
      }
  
      public static <T> T getZookeeperProperty(Message m, String propertyName, T defaultValue, Class<? extends T> type) {
          T value = m.getHeader(propertyName, type);
          if (value == null) {
              value = defaultValue;
          }
          return value;
      }
  
      public static WatchedEvent getWatchedEvent(ZooKeeperOperation<?> zooKeeperOperation) {
          WatchedEvent watchedEvent = null;
          if (zooKeeperOperation instanceof WatchedEventProvider) {
              watchedEvent = ((WatchedEventProvider) zooKeeperOperation).getWatchedEvent();
          }
          return watchedEvent;
      }
  
      public static boolean hasWatchedEvent(ZooKeeperOperation<?> zooKeeperOperation) {
          return getWatchedEvent(zooKeeperOperation) != null;
      }
  }
  