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.operations;
  
  import org.apache.zookeeper.Watcher.Event.EventType;
  import org.apache.zookeeper.ZooKeeper;
  import org.apache.zookeeper.data.Stat;
  
  /**
   * <code>DataChangedOperation</code> is an watch driven operation. It will wait for an watched event indicating that the
   * data contained in a given node has changed before optionally retrieving the changed data.
   */
  @SuppressWarnings("rawtypes")
  public class DataChangedOperation extends FutureEventDrivenOperation<byte[]> {
  
      protected static final Class[] CONSTRUCTOR_ARGS = { ZooKeeper.class, String.class, boolean.class, boolean.class };
  
      private boolean getChangedData;
      private boolean sendEmptyMessageOnDelete;
  
      public DataChangedOperation(ZooKeeper connection, String znode, boolean getChangedData) {
          this(connection, znode, getChangedData, false);
      }
  
      public DataChangedOperation(ZooKeeper connection, String znode, boolean getChangedData, boolean sendEmptyMessageOnDelete) {
          super(connection, znode, EventType.NodeDataChanged, EventType.NodeDeleted);
          this.getChangedData = getChangedData;
          this.sendEmptyMessageOnDelete = sendEmptyMessageOnDelete;
      }
  
      @Override
      protected void installWatch() {
          connection.getData(getNode(), this, (int rc, String path, Object ctx, byte[] data, Stat stat) -> {
          }, null);
      }
  
      @Override
      public OperationResult<byte[]> getResult() {
          OperationResult<byte[]> answer;
          if (EventType.NodeDeleted.equals(getWatchedEvent().getType()) && sendEmptyMessageOnDelete) {
              answer = new OperationResult<>((byte[]) null, null);
          } else if (getChangedData) {
              answer = new GetDataOperation(connection, getNode()).getResult();
          } else {
              answer = null;
          }
          return answer;
      }
  
      @Override
      public ZooKeeperOperation<?> createCopy() throws Exception {
          return getClass().getConstructor(CONSTRUCTOR_ARGS)
                  .newInstance(connection, node, getChangedData, sendEmptyMessageOnDelete);
      }
  }
  