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 java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  
  public abstract class KTableKTableAbstractJoinValueGetterSupplier<K, R, V1, V2> implements KTableValueGetterSupplier<K, R> {
      final KTableValueGetterSupplier<K, V1> valueGetterSupplier1;
      final KTableValueGetterSupplier<K, V2> valueGetterSupplier2;
  
      KTableKTableAbstractJoinValueGetterSupplier(final KTableValueGetterSupplier<K, V1> valueGetterSupplier1,
                                                  final KTableValueGetterSupplier<K, V2> valueGetterSupplier2) {
          this.valueGetterSupplier1 = valueGetterSupplier1;
          this.valueGetterSupplier2 = valueGetterSupplier2;
      }
  
      @Override
      public String[] storeNames() {
          final String[] storeNames1 = valueGetterSupplier1.storeNames();
          final String[] storeNames2 = valueGetterSupplier2.storeNames();
          final Set<String> stores = new HashSet<>(storeNames1.length + storeNames2.length);
          Collections.addAll(stores, storeNames1);
          Collections.addAll(stores, storeNames2);
          return stores.toArray(new String[0]);
      }
  
  }
  