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.internals;
  
  import org.apache.kafka.streams.kstream.ValueMapperWithKey;
  import org.apache.kafka.streams.processor.api.ContextualFixedKeyProcessor;
  import org.apache.kafka.streams.processor.api.FixedKeyProcessor;
  import org.apache.kafka.streams.processor.api.FixedKeyProcessorSupplier;
  import org.apache.kafka.streams.processor.api.FixedKeyRecord;
  
  class KStreamFlatMapValues<KIn, VIn, VOut> implements FixedKeyProcessorSupplier<KIn, VIn, VOut> {
  
      private final ValueMapperWithKey<? super KIn, ? super VIn, ? extends Iterable<? extends VOut>> mapper;
  
      KStreamFlatMapValues(final ValueMapperWithKey<? super KIn, ? super VIn, ? extends Iterable<? extends VOut>> mapper) {
          this.mapper = mapper;
      }
  
      @Override
      public FixedKeyProcessor<KIn, VIn, VOut> get() {
          return new KStreamFlatMapValuesProcessor();
      }
  
      private class KStreamFlatMapValuesProcessor extends
          ContextualFixedKeyProcessor<KIn, VIn, VOut> {
          @Override
          public void process(final FixedKeyRecord<KIn, VIn> record) {
              final Iterable<? extends VOut> newValues = mapper.apply(record.key(), record.value());
              for (final VOut v : newValues) {
                  context().forward(record.withValue(v));
              }
          }
      }
  }
  