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.transforms.util;
  
  import org.apache.kafka.connect.connector.ConnectRecord;
  import org.apache.kafka.connect.data.Schema;
  import org.apache.kafka.connect.data.Struct;
  import org.apache.kafka.connect.errors.DataException;
  import org.apache.kafka.connect.sink.SinkRecord;
  
  import java.util.Map;
  
  public class Requirements {
  
      public static void requireSchema(Schema schema, String purpose) {
          if (schema == null) {
              throw new DataException("Schema required for [" + purpose + "]");
          }
      }
  
      @SuppressWarnings("unchecked")
      public static Map<String, Object> requireMap(Object value, String purpose) {
          if (!(value instanceof Map)) {
              throw new DataException("Only Map objects supported in absence of schema for [" + purpose + "], found: " + nullSafeClassName(value));
          }
          return (Map<String, Object>) value;
      }
  
      public static Map<String, Object> requireMapOrNull(Object value, String purpose) {
          if (value == null) {
              return null;
          }
          return requireMap(value, purpose);
      }
  
      public static Struct requireStruct(Object value, String purpose) {
          if (!(value instanceof Struct)) {
              throw new DataException("Only Struct objects supported for [" + purpose + "], found: " + nullSafeClassName(value));
          }
          return (Struct) value;
      }
  
      public static Struct requireStructOrNull(Object value, String purpose) {
          if (value == null) {
              return null;
          }
          return requireStruct(value, purpose);
      }
  
      public static SinkRecord requireSinkRecord(ConnectRecord<?> record, String purpose) {
          if (!(record instanceof SinkRecord)) {
              throw new DataException("Only SinkRecord supported for [" + purpose + "], found: " + nullSafeClassName(record));
          }
          return (SinkRecord) record;
      }
  
      private static String nullSafeClassName(Object x) {
          return x == null ? "null" : x.getClass().getName();
      }
  
  }
  