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.connect.tools;
  
  import org.apache.kafka.common.config.ConfigDef;
  import org.apache.kafka.connect.runtime.isolation.Plugins;
  import org.apache.kafka.connect.transforms.predicates.Predicate;
  
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  public class PredicateDoc {
  
      private static final class DocInfo {
          final String predicateName;
          final String overview;
          final ConfigDef configDef;
  
          private <P extends Predicate<?>> DocInfo(Class<P> predicateClass, String overview, ConfigDef configDef) {
              this.predicateName = predicateClass.getName();
              this.overview = overview;
              this.configDef = configDef;
          }
      }
  
      private static final List<DocInfo> PREDICATES = new Plugins(Collections.emptyMap()).predicates().stream()
          .map(p -> {
              try {
                  String overviewDoc = (String) p.pluginClass().getDeclaredField("OVERVIEW_DOC").get(null);
                  ConfigDef configDef = (ConfigDef) p.pluginClass().getDeclaredField("CONFIG_DEF").get(null);
                  return new DocInfo(p.pluginClass(), overviewDoc, configDef);
              } catch (ReflectiveOperationException e) {
                  throw new RuntimeException("Predicate class " + p.pluginClass().getName() + " lacks either a `public static final String OVERVIEW_DOC` or `public static final ConfigDef CONFIG_DEF`");
              }
          })
          .sorted(Comparator.comparing(docInfo -> docInfo.predicateName))
          .toList();
  
      private static String toHtml() {
          StringBuilder b = new StringBuilder();
          for (final DocInfo docInfo : PREDICATES) {
              b.append("<div id=\"" + docInfo.predicateName + "\">\n");
              b.append("<h5>");
              b.append("<a href=\"#" + docInfo.predicateName + "\">" + docInfo.predicateName + "</a>");
              b.append("</h5>\n");
              b.append(docInfo.overview + "\n");
              b.append("<p/>\n");
              b.append(docInfo.configDef.toHtml(6, key -> docInfo.predicateName + "_" + key) + "\n");
              b.append("</div>\n");
          }
          return b.toString();
      }
  
      public static void main(String... args) {
          System.out.println(toHtml());
      }
  }
  