content: /*
   * Copyright 2017-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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 org.activiti.cloud.services.events.message;
  
  import java.util.Map;
  import java.util.Optional;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  public abstract class AbstractMessageHeadersRoutingKeyResolver implements RoutingKeyResolver<Map<String, Object>> {
  
      private static final String REPLACEMENT = "-";
      private static final String ILLEGAL_CHARACTERS = "[\\t\\s\\.*#:]";
      private static final String DELIMITER = ".";
      private static final String UNDERSCORE = "_";
  
      public abstract String resolve(Map<String, Object> headers);
  
      protected String build(Map<String, Object> headers, String... keys) {
          return (
              getPrefix() +
              DELIMITER +
              Stream
                  .of(keys)
                  .map(headers::get)
                  .map(Optional::ofNullable)
                  .map(this::mapNullOrEmptyValue)
                  .collect(Collectors.joining(DELIMITER))
          );
      }
  
      private String mapNullOrEmptyValue(Optional<Object> obj) {
          return obj
              .map(Object::toString)
              .filter(value -> !value.isEmpty())
              .map(this::escapeIllegalCharacters)
              .orElse(UNDERSCORE);
      }
  
      protected String escapeIllegalCharacters(String value) {
          return value.replaceAll(ILLEGAL_CHARACTERS, REPLACEMENT);
      }
  
      public abstract String getPrefix();
  }
  