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.sasi.memory;
  
  import java.nio.ByteBuffer;
  
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.index.sasi.conf.ColumnIndex;
  import org.apache.cassandra.index.sasi.disk.Token;
  import org.apache.cassandra.index.sasi.plan.Expression;
  import org.apache.cassandra.index.sasi.utils.RangeIterator;
  import org.apache.cassandra.db.marshal.AbstractType;
  
  public abstract class MemIndex
  {
      protected final AbstractType<?> keyValidator;
      protected final ColumnIndex columnIndex;
  
      protected MemIndex(AbstractType<?> keyValidator, ColumnIndex columnIndex)
      {
          this.keyValidator = keyValidator;
          this.columnIndex = columnIndex;
      }
  
      public abstract long add(DecoratedKey key, ByteBuffer value);
      public abstract RangeIterator<Long, Token> search(Expression expression);
  
      public static MemIndex forColumn(AbstractType<?> keyValidator, ColumnIndex columnIndex)
      {
          return columnIndex.isLiteral()
                  ? new TrieMemIndex(keyValidator, columnIndex)
                  : new SkipListMemIndex(keyValidator, columnIndex);
      }
  }
  