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 com.cloud.resource;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.Command;
  import com.cloud.utils.exception.CloudRuntimeException;
  import com.cloud.utils.script.Script;
  
  public abstract class CommandWrapper<T extends Command, A extends Answer, R extends ServerResource> {
      protected Logger logger = LogManager.getLogger(getClass());
  
      /**
       * @param T is the command to be used.
       * @param R is the resource base to be used.
       * @return A and the Answer from the command.
       */
      public abstract A execute(T command, R serverResource);
  
      protected String sanitizeBashCommandArgument(String input) {
          StringBuilder sanitized = new StringBuilder();
          for (char c : input.toCharArray()) {
              if ("\\\"'`$|&;()<>*?![]{}~".indexOf(c) != -1) {
                  sanitized.append('\\');
              }
              sanitized.append(c);
          }
          return sanitized.toString();
      }
  
      public void removeDpdkPort(String portToRemove) {
          logger.debug("Removing DPDK port: " + portToRemove);
          int port;
          try {
              port = Integer.valueOf(portToRemove);
          } catch (NumberFormatException nfe) {
              throw new CloudRuntimeException(String.format("Invalid DPDK port specified: '%s'", portToRemove));
          }
          Script.executeCommand("ovs-vsctl", "del-port", String.valueOf(port));
      }
  }
  