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.kafka.image.node;
  
  import org.apache.kafka.common.config.ConfigResource;
  import org.apache.kafka.image.ConfigurationImage;
  import org.apache.kafka.image.ConfigurationsImage;
  
  import java.util.ArrayList;
  import java.util.Collection;
  
  
  public class ConfigurationsImageNode implements MetadataNode {
      /**
       * The name of this node.
       */
      public static final String NAME = "configs";
  
      /**
       * The configurations image.
       */
      private final ConfigurationsImage image;
  
      public ConfigurationsImageNode(ConfigurationsImage image) {
          this.image = image;
      }
  
      @Override
      public Collection<String> childNames() {
          ArrayList<String> childNames = new ArrayList<>();
          for (ConfigResource configResource : image.resourceData().keySet()) {
              if (configResource.isDefault()) {
                  childNames.add(configResource.type().name());
              } else {
                  childNames.add(configResource.type().name() + ":" + configResource.name());
              }
          }
          return childNames;
      }
  
      static ConfigResource resourceFromName(String name) {
          for (ConfigResource.Type type : ConfigResource.Type.values()) {
              if (name.startsWith(type.name())) {
                  String key = name.substring(type.name().length());
                  if (key.isEmpty()) {
                      return new ConfigResource(type, "");
                  } else if (key.startsWith(":")) {
                      return new ConfigResource(type, key.substring(1));
                  } else {
                      return null;
                  }
              }
          }
          return null;
      }
  
      @Override
      public MetadataNode child(String name) {
          ConfigResource resource = resourceFromName(name);
          if (resource == null) return null;
          ConfigurationImage configurationImage = image.resourceData().get(resource);
          if (configurationImage == null) return null;
          return new ConfigurationImageNode(configurationImage);
      }
  }
  