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.Set;
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  
  import org.apache.cassandra.db.ReadCommand;
  import org.apache.cassandra.db.filter.RowFilter;
  
  public class SingletonIndexQueryPlan implements Index.QueryPlan
  {
      private final Index index;
      private final Set<Index> indexes;
      private final RowFilter postIndexFilter;
  
      protected SingletonIndexQueryPlan(Index index, RowFilter postIndexFilter)
      {
          this.index = index;
          this.indexes = Collections.singleton(index);
          this.postIndexFilter = postIndexFilter;
      }
  
      @Nullable
      protected static SingletonIndexQueryPlan create(Index index, RowFilter rowFilter)
      {
          if (rowFilter.indexHints.excludes(index))
              return null;
  
          for (RowFilter.Expression e : rowFilter.getExpressions())
          {
              if (index.supportsExpression(e))
                  return new SingletonIndexQueryPlan(index, index.getPostIndexQueryFilter(rowFilter));
          }
  
          return null;
      }
  
      @Override
      public Set<Index> getIndexes()
      {
          return indexes;
      }
  
      @Override
      @Nonnull
      public Index getFirst()
      {
          return index;
      }
  
      @Override
      public long getEstimatedResultRows()
      {
          return index.getEstimatedResultRows();
      }
  
      @Override
      public Index.Searcher searcherFor(ReadCommand command)
      {
          return index.searcherFor(command);
      }
  
      @Override
      public RowFilter postIndexQueryFilter()
      {
          return postIndexFilter;
      }
  }
  