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.cassandra.config;
  
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  import org.apache.cassandra.exceptions.ConfigurationException;
  
  public class InheritingClass extends ParameterizedClass
  {
      public String inherits = null;
  
      @SuppressWarnings("unused") // for snakeyaml
      public InheritingClass()
      {
      }
  
      public InheritingClass(String inherits, String class_name, Map<String, String> parameters)
      {
          super(class_name, parameters);
          this.inherits = inherits;
      }
  
      @SuppressWarnings("unused")
      public InheritingClass(Map<String, ?> p)
      {
          super(p);
          this.inherits = p.get("inherits").toString();
      }
  
      public ParameterizedClass resolve(Map<String, ParameterizedClass> map)
      {
          if (inherits == null)
              return this;
          ParameterizedClass parent = map.get(inherits);
          if (parent == null)
              throw new ConfigurationException("Configuration definition inherits unknown " + inherits
                                               + ". A configuration can only extend one defined earlier or \"default\".");
          Map<String, String> resolvedParameters;
          if (parameters == null || parameters.isEmpty())
              resolvedParameters = parent.parameters;
          else if (parent.parameters == null || parent.parameters.isEmpty())
              resolvedParameters = this.parameters;
          else
          {
              resolvedParameters = new LinkedHashMap<>(parent.parameters);
              resolvedParameters.putAll(this.parameters);
          }
  
          String resolvedClass = this.class_name == null ? parent.class_name : this.class_name;
          return new ParameterizedClass(resolvedClass, resolvedParameters);
      }
  
      @Override
      public String toString()
      {
          return (inherits != null ? (inherits + "+") : "") +
                 (class_name != null ? class_name : "") +
                 (parameters != null ? parameters.toString() : "");
      }
  }
  