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.utils;
  
  import java.io.IOException;
  import java.util.Iterator;
  
  import org.apache.cassandra.index.sasi.disk.OnDiskIndex;
  import org.apache.cassandra.index.sasi.disk.OnDiskIndex.DataTerm;
  import org.apache.cassandra.db.marshal.AbstractType;
  
  public class OnDiskIndexIterator extends RangeIterator<DataTerm, CombinedTerm>
  {
      private final AbstractType<?> comparator;
      private final Iterator<DataTerm> terms;
  
      public OnDiskIndexIterator(OnDiskIndex index)
      {
          super(index.min(), index.max(), Long.MAX_VALUE);
  
          this.comparator = index.getComparator();
          this.terms = index.iterator();
      }
  
      public static RangeIterator<DataTerm, CombinedTerm> union(OnDiskIndex... union)
      {
          RangeUnionIterator.Builder<DataTerm, CombinedTerm> builder = RangeUnionIterator.builder();
          for (OnDiskIndex e : union)
          {
              if (e != null)
                  builder.add(new OnDiskIndexIterator(e));
          }
  
          return builder.build();
      }
  
      protected CombinedTerm computeNext()
      {
          return terms.hasNext() ? new CombinedTerm(comparator, terms.next()) : endOfData();
      }
  
      protected void performSkipTo(DataTerm nextToken)
      {
          throw new UnsupportedOperationException();
      }
  
      public void close() throws IOException
      {}
  }
  