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;
  
  import org.apache.kafka.common.config.ConfigDef;
  import org.apache.kafka.common.utils.AppInfoParser;
  import org.apache.kafka.connect.components.Versioned;
  import org.apache.kafka.connect.connector.ConnectRecord;
  import org.apache.kafka.connect.errors.DataException;
  import org.apache.kafka.connect.transforms.util.SimpleConfig;
  
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.Map;
  import java.util.TimeZone;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  public class TimestampRouter<R extends ConnectRecord<R>> implements Transformation<R>, AutoCloseable, Versioned {
  
      private static final Pattern TOPIC = Pattern.compile("${topic}", Pattern.LITERAL);
  
      private static final Pattern TIMESTAMP = Pattern.compile("${timestamp}", Pattern.LITERAL);
  
      public static final String OVERVIEW_DOC =
              "Update the record's topic field as a function of the original topic value and the record timestamp."
                      + "<p/>"
                      + "This is mainly useful for sink connectors, since the topic field is often used to determine the equivalent entity name in the destination system"
                      + "(e.g. database table or search index name).";
  
      public static final ConfigDef CONFIG_DEF = new ConfigDef()
              .define(ConfigName.TOPIC_FORMAT, ConfigDef.Type.STRING, "${topic}-${timestamp}", ConfigDef.Importance.HIGH,
                      "Format string which can contain <code>${topic}</code> and <code>${timestamp}</code> as placeholders for the topic and timestamp, respectively.")
              .define(ConfigName.TIMESTAMP_FORMAT, ConfigDef.Type.STRING, "yyyyMMdd", ConfigDef.Importance.HIGH,
                      "Format string for the timestamp that is compatible with <code>java.text.SimpleDateFormat</code>.");
  
      private interface ConfigName {
          String TOPIC_FORMAT = "topic.format";
          String TIMESTAMP_FORMAT = "timestamp.format";
      }
  
      private String topicFormat;
      private ThreadLocal<SimpleDateFormat> timestampFormat;
  
      @Override
      public String version() {
          return AppInfoParser.getVersion();
      }
  
      @Override
      public void configure(Map<String, ?> props) {
          final SimpleConfig config = new SimpleConfig(CONFIG_DEF, props);
  
          topicFormat = config.getString(ConfigName.TOPIC_FORMAT);
  
          final String timestampFormatStr = config.getString(ConfigName.TIMESTAMP_FORMAT);
          timestampFormat = ThreadLocal.withInitial(() -> {
              final SimpleDateFormat fmt = new SimpleDateFormat(timestampFormatStr);
              fmt.setTimeZone(TimeZone.getTimeZone("UTC"));
              return fmt;
          });
      }
  
      @Override
      public R apply(R record) {
          final Long timestamp = record.timestamp();
          if (timestamp == null) {
              throw new DataException("Timestamp missing on record: " + record);
          }
          final String formattedTimestamp = timestampFormat.get().format(new Date(timestamp));
  
          final String replace1 = TOPIC.matcher(topicFormat).replaceAll(Matcher.quoteReplacement(record.topic()));
          final String updatedTopic = TIMESTAMP.matcher(replace1).replaceAll(Matcher.quoteReplacement(formattedTimestamp));
          return record.newRecord(
                  updatedTopic, record.kafkaPartition(),
                  record.keySchema(), record.key(),
                  record.valueSchema(), record.value(),
                  record.timestamp()
          );
      }
  
      @Override
      public void close() {
          timestampFormat.remove();
      }
  
      @Override
      public ConfigDef config() {
          return CONFIG_DEF;
      }
  
  }
  