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 com.datastax.dse.driver.internal.core.graph;
  
  import com.datastax.dse.driver.api.core.graph.AsyncGraphResultSet;
  import com.datastax.dse.driver.api.core.graph.GraphNode;
  import com.datastax.oss.driver.api.core.cql.ExecutionInfo;
  import com.datastax.oss.driver.internal.core.util.CountingIterator;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import java.util.Queue;
  import java.util.concurrent.CompletionStage;
  import net.jcip.annotations.NotThreadSafe;
  
  @NotThreadSafe // wraps a mutable queue
  public class DefaultAsyncGraphResultSet implements AsyncGraphResultSet {
  
    private final ExecutionInfo executionInfo;
    private final CountingIterator<GraphNode> iterator;
    private final Iterable<GraphNode> currentPage;
  
    public DefaultAsyncGraphResultSet(
        ExecutionInfo executionInfo, Queue<GraphNode> data, GraphProtocol graphProtocol) {
      this.executionInfo = executionInfo;
      this.iterator = new GraphResultIterator(data, graphProtocol);
      this.currentPage = () -> iterator;
    }
  
    @NonNull
    @Override
    public ExecutionInfo getRequestExecutionInfo() {
      return executionInfo;
    }
  
    @NonNull
    @Override
    @Deprecated
    public com.datastax.dse.driver.api.core.graph.GraphExecutionInfo getExecutionInfo() {
      return GraphExecutionInfoConverter.convert(executionInfo);
    }
  
    @Override
    public int remaining() {
      return iterator.remaining();
    }
  
    @NonNull
    @Override
    public Iterable<GraphNode> currentPage() {
      return currentPage;
    }
  
    @Override
    public boolean hasMorePages() {
      return false;
    }
  
    @NonNull
    @Override
    public CompletionStage<AsyncGraphResultSet> fetchNextPage() throws IllegalStateException {
      throw new IllegalStateException(
          "No next page. Use #hasMorePages before calling this method to avoid this error.");
    }
  
    @Override
    public void cancel() {
      // nothing to do
    }
  }
  