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.processor.api.Processor;
  import org.apache.kafka.streams.processor.api.ProcessorContext;
  import org.apache.kafka.streams.processor.api.Record;
  import org.apache.kafka.streams.state.ValueAndTimestamp;
  import org.apache.kafka.streams.state.internals.KeyValueStoreWrapper;
  
  import java.util.Collection;
  
  @SuppressWarnings("rawtypes")
  public class KTablePassThrough<KIn, VIn> implements KTableProcessorSupplier<KIn, VIn, KIn, VIn> {
      private final Collection<KStreamAggProcessorSupplier> parents;
      private final String storeName;
  
  
      KTablePassThrough(final Collection<KStreamAggProcessorSupplier> parents, final String storeName) {
          this.parents = parents;
          this.storeName = storeName;
      }
  
      @Override
      public Processor<KIn, Change<VIn>, KIn, Change<VIn>> get() {
          return new KTablePassThroughProcessor();
      }
  
      @Override
      public boolean enableSendingOldValues(final boolean forceMaterialization) {
          // Aggregation requires materialization so we will always enable sending old values
          for (final KStreamAggProcessorSupplier parent : parents) {
              parent.enableSendingOldValues();
          }
          return true;
      }
  
      @Override
      public KTableValueGetterSupplier<KIn, VIn> view() {
  
          return new KTableValueGetterSupplier<KIn, VIn>() {
  
              public KTableValueGetter<KIn, VIn> get() {
                  return new KTablePassThroughValueGetter();
              }
  
              @Override
              public String[] storeNames() {
                  return new String[]{storeName};
              }
          };
      }
  
      private class KTablePassThroughProcessor implements Processor<KIn, Change<VIn>, KIn, Change<VIn>> {
          private ProcessorContext<KIn, Change<VIn>> context;
  
          @Override
          public void init(final ProcessorContext<KIn, Change<VIn>> context) {
              this.context = context;
          }
  
          @Override
          public void process(final Record<KIn, Change<VIn>> record) {
              context.forward(record);
          }
      }
  
      private class KTablePassThroughValueGetter implements KTableValueGetter<KIn, VIn> {
          private KeyValueStoreWrapper<KIn, VIn> store;
  
          @Override
          public void init(final ProcessorContext<?, ?> context) {
              store = new KeyValueStoreWrapper<>(context, storeName);
          }
  
          @Override
          public ValueAndTimestamp<VIn> get(final KIn key) {
              return store.get(key);
          }
  
          @Override
          public ValueAndTimestamp<VIn> get(final KIn key, final long asOfTimestamp) {
              return store.get(key, asOfTimestamp);
          }
  
          @Override
          public boolean isVersioned() {
              return store.isVersionedStore();
          }
      }
  }
  