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   * 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
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  package org.apache.cassandra.index.internal.keys;
  
  import java.nio.ByteBuffer;
  
  import org.apache.cassandra.db.marshal.ByteBufferAccessor;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.schema.TableMetadataRef;
  import org.apache.cassandra.schema.ColumnMetadata;
  import org.apache.cassandra.db.*;
  import org.apache.cassandra.db.rows.Cell;
  import org.apache.cassandra.db.rows.CellPath;
  import org.apache.cassandra.db.rows.Row;
  import org.apache.cassandra.index.internal.CassandraIndex;
  import org.apache.cassandra.index.internal.IndexEntry;
  import org.apache.cassandra.schema.IndexMetadata;
  
  public class KeysIndex extends CassandraIndex
  {
      public KeysIndex(ColumnFamilyStore baseCfs, IndexMetadata indexDef)
      {
          super(baseCfs, indexDef);
      }
  
      public TableMetadata.Builder addIndexClusteringColumns(TableMetadata.Builder builder,
                                                             TableMetadataRef baseMetadata,
                                                             ColumnMetadata cfDef)
      {
          // no additional clustering columns required
          return builder;
      }
  
      protected <T> CBuilder buildIndexClusteringPrefix(ByteBuffer partitionKey,
                                                        ClusteringPrefix<T> prefix,
                                                        CellPath path)
      {
          CBuilder builder = CBuilder.create(getIndexComparator());
          builder.add(partitionKey, ByteBufferAccessor.instance);
          return builder;
      }
  
      protected ByteBuffer getIndexedValue(ByteBuffer partitionKey,
                                           Clustering<?> clustering,
                                           CellPath path, ByteBuffer cellValue)
      {
          return cellValue;
      }
  
      public IndexEntry decodeEntry(DecoratedKey indexedValue, Row indexEntry)
      {
          throw new UnsupportedOperationException("KEYS indexes do not use a specialized index entry format");
      }
  
      private <V> int compare(ByteBuffer left, Cell<V> right)
      {
          return indexedColumn.type.compare(left, ByteBufferAccessor.instance, right.value(), right.accessor());
      }
  
      public boolean isStale(Row row, ByteBuffer indexValue, long nowInSec)
      {
          if (row == null)
              return true;
  
          Cell<?> cell = row.getCell(indexedColumn);
  
          return (cell == null
                  || !cell.isLive(nowInSec)
                  || compare(indexValue, cell) != 0);
      }
  }
  