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.ZooKeeper;
  import org.apache.zookeeper.data.Stat;
  
  /**
   * <code>ExistsOperation</code> is a basic ZooKeeper operation used to test the existence of a given node.
   */
  public class ExistsOperation extends ZooKeeperOperation<String> {
  
      private boolean mustExist;
  
      public ExistsOperation(ZooKeeper connection, String node) {
          this(connection, node, true);
      }
  
      public ExistsOperation(ZooKeeper connection, String node, boolean mustExist) {
          super(connection, node);
          this.mustExist = mustExist;
      }
  
      @Override
      public OperationResult<String> getResult() {
          try {
              Stat statistics = connection.exists(node, true);
              boolean ok = isOk(statistics);
              if (LOG.isTraceEnabled()) {
                  LOG.trace(ok ? "node exists" : "node does not exist");
              }
              return new OperationResult<>(node, statistics, ok);
          } catch (InterruptedException e) {
              Thread.currentThread().interrupt();
              return new OperationResult<>(e);
          } catch (Exception e) {
              return new OperationResult<>(e);
          }
      }
  
      private boolean isOk(Stat statistics) {
          boolean ok = false;
          if (mustExist) {
              ok = statistics != null;
          } else {
              ok = statistics == null;
          }
          return ok;
      }
  
  }
  