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 accord.impl.list;
  
  import java.util.Map;
  import java.util.Objects;
  
  import accord.api.Data;
  import accord.api.Key;
  import accord.api.Query;
  import accord.api.Read;
  import accord.api.Result;
  import accord.api.Update;
  import accord.local.Node.Id;
  import accord.primitives.Keys;
  import accord.primitives.Seekables;
  import accord.primitives.Timestamp;
  import accord.primitives.TxnId;
  import accord.utils.Invariants;
  import accord.utils.Timestamped;
  import javax.annotation.Nonnull;
  
  public class ListQuery implements Query
  {
      public final Id client;
      public final long requestId;
      public final boolean isEphemeralRead;
  
      public ListQuery(Id client, long requestId, boolean isEphemeralRead)
      {
          this.client = client;
          this.requestId = requestId;
          this.isEphemeralRead = isEphemeralRead;
      }
  
      @Override
      public Result compute(@Nonnull TxnId txnId, @Nonnull Timestamp executeAt, @Nonnull Seekables<?, ?> keys, Data data, Read untypedRead, Update update)
      {
          if (data == null)
              return new ListResult(ListResult.Status.Applied, client, requestId, txnId, Keys.EMPTY, Keys.EMPTY, new int[0][0], (ListUpdate) update);
  
          ListRead read = (ListRead) untypedRead;
          Keys responseKeys = Keys.ofSortedUnique(((ListData)data).keySet());
          int[][] values = new int[responseKeys.size()][];
          for (Map.Entry<Key, Timestamped<int[]>> e : ((ListData)data).entrySet())
          {
              int i = responseKeys.indexOf(e.getKey());
              if (i >= 0)
              {
                  Timestamp timestamp = e.getValue().timestamp;
                  Invariants.require(isEphemeralRead || timestamp.compareTo(executeAt) < 0,
                                     "Data timestamp %s >= execute at %s", timestamp, executeAt);
                  values[i] = e.getValue().data;
              }
          }
          return new ListResult(ListResult.Status.Applied, client, requestId, txnId, read.userReadKeys, responseKeys, values, (ListUpdate) update);
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          ListQuery listQuery = (ListQuery) o;
          return requestId == listQuery.requestId && Objects.equals(client, listQuery.client);
      }
  
      @Override
      public int hashCode()
      {
          throw new UnsupportedOperationException();
      }
  }
  