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.test;
  
  import org.apache.kafka.streams.StoreQueryParameters;
  import org.apache.kafka.streams.errors.InvalidStateStoreException;
  import org.apache.kafka.streams.processor.StateStore;
  import org.apache.kafka.streams.state.QueryableStoreType;
  import org.apache.kafka.streams.state.internals.StreamThreadStateStoreProvider;
  
  import java.util.AbstractMap.SimpleEntry;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.stream.Collectors;
  
  public class StateStoreProviderStub extends StreamThreadStateStoreProvider {
  
      //<store name : partition> -> state store
      private final Map<Entry<String, Integer>, StateStore> stores = new HashMap<>();
      private final boolean throwException;
  
      private final int defaultStorePartition = 0;
  
      public StateStoreProviderStub(final boolean throwException) {
          super(null);
          this.throwException = throwException;
      }
  
      @SuppressWarnings({"unchecked", "rawtypes"})
      @Override
      public <T> List<T> stores(final StoreQueryParameters storeQueryParameters) {
          final String storeName = storeQueryParameters.storeName();
          final QueryableStoreType<T> queryableStoreType = storeQueryParameters.queryableStoreType();
          if (throwException) {
              throw new InvalidStateStoreException("store is unavailable");
          }
          if (storeQueryParameters.partition() != null) {
              final Entry<String, Integer> stateStoreKey = new SimpleEntry<>(storeName, storeQueryParameters.partition());
              if (stores.containsKey(stateStoreKey) && queryableStoreType.accepts(stores.get(stateStoreKey))) {
                  return (List<T>) Collections.singletonList(stores.get(stateStoreKey));
              }
              return Collections.emptyList();
          }
          return (List<T>) Collections.unmodifiableList(
                  stores.entrySet().stream().
                          filter(entry -> entry.getKey().getKey().equals(storeName) && queryableStoreType.accepts(entry.getValue())).
                          map(Entry::getValue).
                          collect(Collectors.toList()));
      }
  
      public void addStore(final String storeName,
                           final StateStore store) {
          addStore(storeName, defaultStorePartition, store);
      }
  
      public void addStore(final String storeName,
                           final int partition,
                           final StateStore store) {
          stores.put(new SimpleEntry<>(storeName, partition), store);
      }
  }
  