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.streams.kstream;
  
  import org.apache.kafka.common.config.ConfigException;
  import org.apache.kafka.common.serialization.Serde;
  import org.apache.kafka.common.serialization.Serializer;
  import org.apache.kafka.common.utils.Utils;
  import org.apache.kafka.streams.StreamsConfig;
  import org.apache.kafka.streams.kstream.internals.WindowedSerializer;
  import org.apache.kafka.streams.state.internals.WindowKeySchema;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Map;
  
  public class TimeWindowedSerializer<T> implements WindowedSerializer<T> {
  
      /**
       * Default serializer for the inner serializer class of a windowed record. Must implement the {@link Serde} interface.
       */
      public static final String WINDOWED_INNER_SERIALIZER_CLASS = "windowed.inner.serializer.class";
  
      private final Logger log = LoggerFactory.getLogger(TimeWindowedSerializer.class);
  
      private Serializer<T> inner;
  
      // Default constructor needed by Kafka
      @SuppressWarnings("WeakerAccess")
      public TimeWindowedSerializer() {}
  
      public TimeWindowedSerializer(final Serializer<T> inner) {
          this.inner = inner;
      }
  
      @SuppressWarnings({"deprecation", "unchecked"})
      @Override
      public void configure(final Map<String, ?> configs, final boolean isKey) {
          String serializerConfigKey = WINDOWED_INNER_SERIALIZER_CLASS;
          String serializerConfigValue = (String) configs.get(WINDOWED_INNER_SERIALIZER_CLASS);
          if (serializerConfigValue == null) {
              final String windowedInnerClassSerdeConfig = (String) configs.get(StreamsConfig.WINDOWED_INNER_CLASS_SERDE);
              if (windowedInnerClassSerdeConfig != null) {
                  serializerConfigKey = StreamsConfig.WINDOWED_INNER_CLASS_SERDE;
                  serializerConfigValue = windowedInnerClassSerdeConfig;
                  log.warn("Config {} is deprecated. Please use {} instead.",
                      StreamsConfig.WINDOWED_INNER_CLASS_SERDE, WINDOWED_INNER_SERIALIZER_CLASS);
              }
          }
          Serde<T> windowedInnerSerializerClass = null;
          if (serializerConfigValue != null) {
              try {
                  windowedInnerSerializerClass = Utils.newInstance(serializerConfigValue, Serde.class);
              } catch (final ClassNotFoundException e) {
                  throw new ConfigException(serializerConfigKey, serializerConfigValue,
                      "Serde class " + serializerConfigValue + " could not be found.");
              }
          }
  
          if (inner != null && serializerConfigValue != null) {
              if (!inner.getClass().getName().equals(windowedInnerSerializerClass.serializer().getClass().getName())) {
                  throw new IllegalArgumentException("Inner class serializer set using constructor "
                      + "(" + inner.getClass().getName() + ")" +
                      " is different from the one set in " + serializerConfigKey + " config " +
                      "(" + windowedInnerSerializerClass.serializer().getClass().getName() + ").");
              }
          } else if (inner == null && serializerConfigValue == null) {
              throw new IllegalArgumentException("Inner class serializer should be set either via constructor " +
                  "or via the " + WINDOWED_INNER_SERIALIZER_CLASS + " config");
          } else if (inner == null)
              inner = windowedInnerSerializerClass.serializer();
      }
  
      @Override
      public byte[] serialize(final String topic, final Windowed<T> data) {
          WindowedSerdes.verifyInnerSerializerNotNull(inner, this);
  
          if (data == null) {
              return null;
          }
  
          return WindowKeySchema.toBinary(data, inner, topic);
      }
  
      @Override
      public void close() {
          if (inner != null) {
              inner.close();
          }
      }
  
      @Override
      public byte[] serializeBaseKey(final String topic, final Windowed<T> data) {
          WindowedSerdes.verifyInnerSerializerNotNull(inner, this);
  
          return inner.serialize(topic, data.key());
      }
  
      // Only for testing
      Serializer<T> innerSerializer() {
          return inner;
      }
  }
  