code: /*
   * Copyright © 2014-2017 EntIT Software LLC, a Micro Focus company (L.P.)
   *
   * Licensed 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 io.cloudslang.runtime.impl;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Set;
  
  /**
   * Created by Genadi Rabinovich, genadi@hpe.com on 05/05/2016.
   */
  public abstract class ExecutionEngine {
      private static final String NO_DEPENDENCIES_KEY = "";
  
      protected String generatedDependenciesKey(Set<String> dependencies) {
          // optimistic - this is java (which has only one dependency) or python with on dependency
          if(dependencies.size() == 1) {
              return dependencies.iterator().next();
          }
          // optimistic - this is old content - no dependencies
          if(dependencies.isEmpty()) {
              return NO_DEPENDENCIES_KEY;
          }
  
          List<String> actionDependencies = new ArrayList<>();
          actionDependencies.addAll(dependencies);
          Collections.sort(actionDependencies);
          StringBuilder sb = new StringBuilder();
          for (String dependency : actionDependencies) {
              sb.append(dependency).append(";");
          }
          return sb.toString();
      }
  }
  