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.sai.memory;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Iterator;
  import java.util.List;
  import java.util.concurrent.atomic.LongAdder;
  import java.util.function.Function;
  
  import org.apache.cassandra.db.Clustering;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.db.PartitionPosition;
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.dht.AbstractBounds;
  import org.apache.cassandra.index.sai.QueryContext;
  import org.apache.cassandra.index.sai.StorageAttachedIndex;
  import org.apache.cassandra.index.sai.disk.format.IndexDescriptor;
  import org.apache.cassandra.index.sai.utils.IndexIdentifier;
  import org.apache.cassandra.index.sai.disk.v1.segment.SegmentMetadata;
  import org.apache.cassandra.index.sai.iterators.KeyRangeIterator;
  import org.apache.cassandra.index.sai.plan.Expression;
  import org.apache.cassandra.index.sai.utils.PrimaryKey;
  import org.apache.cassandra.index.sai.utils.PrimaryKeys;
  import org.apache.cassandra.utils.Pair;
  import org.apache.cassandra.utils.bytecomparable.ByteComparable;
  
  public class MemtableIndex implements MemtableOrdering
  {
      private final MemoryIndex memoryIndex;
      private final LongAdder writeCount = new LongAdder();
      private final LongAdder estimatedMemoryUsed = new LongAdder();
      private final AbstractType<?> type;
  
      public MemtableIndex(StorageAttachedIndex index)
      {
          this.memoryIndex = index.termType().isVector() ? new VectorMemoryIndex(index) : new TrieMemoryIndex(index);
          this.type = index.termType().indexType();
      }
  
      public long writeCount()
      {
          return writeCount.sum();
      }
  
      public long estimatedMemoryUsed()
      {
          return estimatedMemoryUsed.sum();
      }
  
      public boolean isEmpty()
      {
          return memoryIndex.isEmpty();
      }
  
      public ByteBuffer getMinTerm()
      {
          return memoryIndex.getMinTerm();
      }
  
      public ByteBuffer getMaxTerm()
      {
          return memoryIndex.getMaxTerm();
      }
  
      public long index(DecoratedKey key, Clustering<?> clustering, ByteBuffer value)
      {
          if (value == null || (value.remaining() == 0 && memoryIndex.index.termType().skipsEmptyValue()))
              return 0;
  
          long ram = memoryIndex.add(key, clustering, value);
          writeCount.increment();
          estimatedMemoryUsed.add(ram);
          return ram;
      }
  
      public long update(DecoratedKey key, Clustering<?> clustering, ByteBuffer oldValue, ByteBuffer newValue)
      {
          return memoryIndex.update(key, clustering, oldValue, newValue);
      }
  
      public KeyRangeIterator search(QueryContext queryContext, Expression expression, AbstractBounds<PartitionPosition> keyRange)
      {
          return memoryIndex.search(queryContext, expression, keyRange);
      }
  
      public Iterator<Pair<ByteComparable, PrimaryKeys>> iterator()
      {
          return memoryIndex.iterator();
      }
  
      public SegmentMetadata.ComponentMetadataMap writeDirect(IndexDescriptor indexDescriptor,
                                                              IndexIdentifier indexIdentifier,
                                                              Function<PrimaryKey, Integer> postingTransformer) throws IOException
      {
          return memoryIndex.writeDirect(indexDescriptor, indexIdentifier, postingTransformer);
      }
  
      @Override
      public KeyRangeIterator limitToTopResults(List<PrimaryKey> primaryKeys, Expression expression, int limit)
      {
          return memoryIndex.limitToTopResults(primaryKeys, expression, limit);
      }
  }
  