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.ArrayList;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  
  import com.carrotsearch.hppc.LongHashSet;
  import com.carrotsearch.hppc.LongSet;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.index.sasi.disk.Token;
  
  public class LongIterator extends RangeIterator<Long, Token>
  {
      private final List<LongToken> tokens;
      private int currentIdx = 0;
  
      public LongIterator(long[] tokens)
      {
          super(tokens.length == 0 ? null : tokens[0], tokens.length == 0 ? null : tokens[tokens.length - 1], tokens.length);
          this.tokens = new ArrayList<>(tokens.length);
          for (long token : tokens)
              this.tokens.add(new LongToken(token));
      }
  
      @Override
      protected Token computeNext()
      {
          if (currentIdx >= tokens.size())
              return endOfData();
  
          return tokens.get(currentIdx++);
      }
  
      @Override
      protected void performSkipTo(Long nextToken)
      {
          for (int i = currentIdx == 0 ? 0 : currentIdx - 1; i < tokens.size(); i++)
          {
              LongToken token = tokens.get(i);
              if (token.get().compareTo(nextToken) >= 0)
              {
                  currentIdx = i;
                  break;
              }
          }
      }
  
      @Override
      public void close() throws IOException
      {}
  
      public static class LongToken extends Token
      {
          public LongToken(long token)
          {
              super(token);
          }
  
          @Override
          public void merge(CombinedValue<Long> other)
          {
              // no-op
          }
  
          @Override
          public LongSet getOffsets()
          {
              return new LongHashSet(4);
          }
  
          @Override
          public Iterator<DecoratedKey> iterator()
          {
              return Collections.emptyIterator();
          }
      }
  
      public static List<Long> convert(RangeIterator<Long, Token> tokens)
      {
          List<Long> results = new ArrayList<>();
          while (tokens.hasNext())
              results.add(tokens.next().get());
  
          return results;
      }
  
      public static List<Long> convert(final long... nums)
      {
          return new ArrayList<Long>(nums.length)
          {{
                  for (long n : nums)
                      add(n);
          }};
      }
  }
  