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.state.internals;
  
  import org.apache.kafka.common.serialization.Deserializer;
  import org.apache.kafka.streams.kstream.internals.WrappingNullableDeserializer;
  import org.apache.kafka.streams.processor.internals.SerdeGetter;
  
  import java.util.Map;
  
  import static org.apache.kafka.streams.kstream.internals.WrappingNullableUtils.initNullableDeserializer;
  
  public class LeftOrRightValueDeserializer<V1, V2> implements WrappingNullableDeserializer<LeftOrRightValue<V1, V2>, Void, Object> {
      public Deserializer<V1> leftDeserializer;
      public Deserializer<V2> rightDeserializer;
  
      public LeftOrRightValueDeserializer(final Deserializer<V1> leftDeserializer, final Deserializer<V2> rightDeserializer) {
          this.leftDeserializer = leftDeserializer;
          this.rightDeserializer = rightDeserializer;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public void setIfUnset(final SerdeGetter getter) {
          if (leftDeserializer == null) {
              leftDeserializer = (Deserializer<V1>) getter.valueSerde().deserializer();
          }
  
          if (rightDeserializer == null) {
              rightDeserializer = (Deserializer<V2>) getter.valueSerde().deserializer();
          }
  
          initNullableDeserializer(leftDeserializer, getter);
          initNullableDeserializer(rightDeserializer, getter);
      }
  
      @Override
      public void configure(final Map<String, ?> configs,
                            final boolean isKey) {
          leftDeserializer.configure(configs, isKey);
          rightDeserializer.configure(configs, isKey);
      }
  
      @Override
      public LeftOrRightValue<V1, V2> deserialize(final String topic, final byte[] data) {
          if (data == null || data.length == 0) {
              return null;
          }
  
          return (data[0] == 1)
              ? LeftOrRightValue.makeLeftValue(leftDeserializer.deserialize(topic, rawValue(data)))
              : LeftOrRightValue.makeRightValue(rightDeserializer.deserialize(topic, rawValue(data)));
      }
  
      private byte[] rawValue(final byte[] data) {
          final byte[] rawValue = new byte[data.length - 1];
          System.arraycopy(data, 1, rawValue, 0, rawValue.length);
          return rawValue;
      }
  }