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.cassandra.index;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  import java.util.function.Predicate;
  import javax.annotation.Nullable;
  
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.db.RegularAndStaticColumns;
  import org.apache.cassandra.db.WriteContext;
  import org.apache.cassandra.db.filter.RowFilter;
  import org.apache.cassandra.db.lifecycle.ILifecycleTransaction;
  import org.apache.cassandra.db.memtable.Memtable;
  import org.apache.cassandra.index.transactions.IndexTransaction;
  import org.apache.cassandra.io.sstable.Component;
  import org.apache.cassandra.io.sstable.Descriptor;
  import org.apache.cassandra.io.sstable.SSTableFlushObserver;
  import org.apache.cassandra.schema.TableMetadata;
  
  /**
   * Basic custom index group implementation for testing.
   */
  public class StubIndexGroup implements Index.Group
  {
      private final Set<Index> indexes = new HashSet<>();
  
      @Override
      public Set<Index> getIndexes()
      {
          return indexes;
      }
  
      @Override
      public void addIndex(Index index)
      {
          indexes.add(index);
      }
  
      @Override
      public void removeIndex(Index index)
      {
          indexes.remove(index);
      }
  
      @Override
      public boolean containsIndex(Index index)
      {
          return indexes.contains(index);
      }
  
      @Override
      public boolean isSingleton()
      {
          return false;
      }
  
      @Override
      public Index.Indexer indexerFor(Predicate<Index> indexSelector,
                                      DecoratedKey key,
                                      RegularAndStaticColumns columns,
                                      long nowInSec,
                                      WriteContext context,
                                      IndexTransaction.Type transactionType,
                                      Memtable memtable)
      {
          return null;
      }
  
      @Nullable
      @Override
      public Index.QueryPlan queryPlanFor(RowFilter rowFilter)
      {
          return null;
      }
  
      @Override
      public SSTableFlushObserver getFlushObserver(Descriptor descriptor, ILifecycleTransaction txn, TableMetadata tableMetadata)
      {
          return null;
      }
  
      public Set<Component> getComponents()
      {
          return Collections.emptySet();
      }
  }